Is this MP4 converter really free?

Yes. Converting videos to MP4 here is completely free with no sign-up, no watermark and no daily file limit imposed by an account. The tool is funded by unobtrusive advertising and an optional Pro plan, but the core conversion is free forever.

Are my videos uploaded to a server?

No. The conversion runs entirely on your device using FFmpeg compiled to WebAssembly. Your video file is read directly in the browser, transcoded locally, and offered back to you as a download. Nothing is sent to us or to any third party, which makes it private and GDPR-friendly by design.

Which formats can I convert to MP4?

You can convert AVI, MOV, MKV, WMV, FLV, WEBM, M4V, MPEG, MPG, 3GP, OGV, TS, MTS, M2TS, VOB, ASF, F4V, DV and RMVB to MP4, and you can also re-encode an existing MP4 to change its codec, resolution or size. Drag in one file or dozens — the batch queue converts them in sequence.

How do I convert AVI to MP4?

Drop your .avi file onto the upload area (or click to browse), keep the default Balanced preset or open Advanced settings to choose a codec and resolution, then press Convert. The AVI is decoded and re-encoded to H.264 MP4 in your browser, and a Download button appears when it finishes.

How do I convert MOV to MP4?

Add your .mov file (for example a clip from an iPhone or a QuickTime export), then click Convert. Because MOV and MP4 share the same underlying codecs, conversion is fast and quality is preserved. If you only need to change the container and not the codec, pick the "Copy (remux)" video codec for an almost-instant result.

How do I convert MKV to MP4?

Upload the .mkv file and convert. MKV is a flexible container that browsers cannot usually play, so converting to MP4 makes the video compatible with phones, smart TVs, editing software and social media. Subtitles muxed into the MKV are not burned in automatically; choose your audio track settings before converting.

Why should I use the MP4 format?

MP4 offers the best balance of quality, file size and compatibility. It supports modern codecs such as H.264, H.265 and AV1, is accepted by virtually every device, browser, social network and player, and supports fast-start streaming so a clip can begin playing before it fully downloads. For most people, MP4 (H.264 + AAC) is the safest universal choice.

What is the difference between H.264, H.265 and AV1?

H.264 (AVC) is the most compatible codec and plays everywhere — it is the recommended default. H.265 (HEVC) produces roughly 40–50% smaller files at the same quality but encodes more slowly and is less universally supported. AV1 is the most efficient modern codec with the best compression, but it is the slowest to encode and is best reserved for web delivery. Choose H.264 unless you specifically need smaller files.

Will converting reduce the quality of my video?

Re-encoding always involves some loss, but with the right settings it is visually negligible. The Maximum Quality preset uses a low CRF for near-lossless results, while Balanced gives excellent quality at a sensible size. If your source is already H.264/AAC, choosing "Copy (remux)" rewraps the streams into MP4 with zero quality loss.

What does CRF mean and which value should I use?

CRF (Constant Rate Factor) controls quality for H.264 and H.265. Lower numbers mean higher quality and larger files. A CRF of 18 is visually lossless, 23 is the default sweet spot, and 28 is noticeably compressed. For sharing online, 22–24 is ideal; for archiving, use 17–20.

Can I convert multiple videos at once?

Yes. Add as many files as you like and the batch queue converts them one after another, showing live progress for each. When everything is done you can download files individually or grab them all in a single ZIP archive.

Is there a file-size limit?

Because conversion happens in your browser, the practical limit is your device memory rather than an artificial server cap. Most browsers comfortably handle files up to a couple of gigabytes. For very large 4K files, use a desktop browser and close other heavy tabs for the best performance.

How long does conversion take?

It depends on the video length, resolution, chosen codec and your device. H.264 at a fast preset is the quickest; H.265 and AV1 take longer. A short 1080p clip usually finishes in well under a minute, while long 4K videos can take several minutes. A live progress bar and estimated time remaining keep you informed.

Can I change the resolution or frame rate?

Yes. In Advanced settings you can downscale to 240p, 360p, 480p, 720p, 1080p, 1440p or 4K (or set a custom width and height), and lock the frame rate to 24, 30 or 60 fps. Downscaling and lowering the frame rate are the most effective ways to shrink a file.

Can I trim, crop or rotate while converting?

Yes. The advanced tools let you trim the start and end, crop to a region, rotate in 90° steps, flip horizontally or vertically, change playback speed, adjust volume and strip the audio — all applied during the single conversion pass so there is no extra quality loss.

Does it work on mobile phones?

Yes. The converter runs in modern mobile browsers on Android and iOS. Large or high-resolution conversions are slower on phones because they have less memory and processing power, so for heavy 4K work a laptop or desktop is recommended.

Can I convert a video from a URL?

Yes, when the hosting server allows cross-origin downloads. Paste a direct link to a video file and it will be fetched into the queue. Some servers block this for security (CORS); in that case, download the file first and then upload it.

Will the converted MP4 play on social media?

Yes. MP4 with H.264 video and AAC audio is the format recommended by YouTube, Instagram, TikTok, Facebook, X and WhatsApp. The platform presets pre-configure resolution, frame rate and bitrate to match each network's guidelines.

What is fast-start and should I enable it?

Fast-start moves the MP4 index (the "moov atom") to the beginning of the file so a video can start playing before it has fully downloaded. It is essential for web and social uploads and is enabled by default; there is no downside to leaving it on.

Do you keep or delete my files?

There is nothing to delete on our side because your files never leave your device. The original and the converted output live only in your browser's memory and are released as soon as you close or refresh the tab.

Can I remove the audio or boost the volume?

Yes. You can strip the audio track entirely for a silent MP4, keep the original audio with "Copy", or re-encode it to AAC, MP3, Opus or AC-3 with a chosen bitrate, channel layout and sample rate. A volume-boost control lets you raise quiet audio by a set number of decibels.

Is a Video to MP4 converter the same as a video compressor?

They overlap. Converting changes the format; compressing reduces the file size. This tool does both — choose the "Smallest Size" preset or lower the resolution, raise the CRF or pick H.265 to compress while you convert to MP4.

How does this compare to CloudConvert, Zamzar or Convertio?

Those services upload your video to their servers, queue it, convert it remotely and send it back, with free-tier limits on file count and size. This converter does the work locally in your browser, so it is private, has no upload wait, no per-file account limit and no watermark — at the cost of using your own device's processing power.

How can I convert a video to MP4 for free online?

Open this free online MP4 converter, drag your video onto the upload area, pick a preset or leave the Balanced default, and click Convert. The MP4 is produced in your browser and a Download button appears — there is no sign-up, no payment and no watermark at any step.

Is there a free MP4 converter with no watermark?

Yes. This free MP4 converter never adds a watermark, logo or overlay to your video. Your converted MP4 is identical to what your settings specify, with nothing added — unlike many free desktop apps and some online services that stamp the output.

Can I convert video to MP4 without uploading?

Yes — that is the core of how this tool works. There is no upload step at all. The video is read directly from your device by the browser, transcoded locally with WebAssembly FFmpeg, and handed back to you. Nothing is transmitted over the network, which makes it ideal for confidential or large files.

Is this a secure video converter?

It is one of the most secure ways to convert video online because your file never leaves your computer. With cloud converters your video is uploaded, stored temporarily and processed on a remote server you do not control. Here the file stays in your browser's memory and is discarded when you close the tab.

What is a browser video converter?

A browser video converter runs the conversion inside your web browser instead of on a server or in installed software. This one uses FFmpeg compiled to WebAssembly, so the same engine that powers professional desktop tools runs locally on your machine — no installation, no upload, no account.

Does this MP4 converter use FFmpeg?

Yes. It runs the real FFmpeg engine compiled to WebAssembly (Wasm). Every setting you choose — codec, resolution, bitrate, trim, crop, rotate — maps to genuine FFmpeg parameters, so you get the same quality and control as a command-line FFmpeg conversion, but through a simple interface.

How do I convert WEBM to MP4?

Add your .webm file, keep H.264 + AAC (the default) for maximum compatibility, and click Convert. WEBM is common for web downloads and screen recordings but is not accepted everywhere; converting to MP4 makes it play on phones, TVs, editors and social platforms.

How do I convert FLV to MP4?

Upload the old Flash .flv video and convert. FLV is a legacy format that modern devices and browsers no longer support well, so converting to MP4 with H.264 brings the footage back to a format you can actually play and share today.

How do I convert WMV to MP4?

Drop your Windows Media .wmv file in and press Convert. WMV plays mainly on Windows; converting to MP4 lets the same video work on Macs, iPhones, Androids, smart TVs and the web without extra software.

How do I convert MPEG or MPG to MP4?

Add the .mpeg or .mpg file and convert to MP4. These older MPEG-1/MPEG-2 program streams are large and not ideal for streaming; re-encoding to H.264 MP4 makes them far smaller and web-friendly while keeping the picture clean.

How do I convert TS, MTS or M2TS to MP4?

Upload the transport-stream or AVCHD camcorder file (.ts, .mts, .m2ts) and convert. These formats come from cameras, DVRs and broadcast recordings; converting to MP4 makes them editable and playable on ordinary devices.

How do I convert 3GP to MP4?

Add the old mobile .3gp clip and click Convert. 3GP was used by older phones and is low-resolution; converting to MP4 standardises it so it plays smoothly on current devices and uploads cleanly to social media.

Can I convert a VOB (DVD) file to MP4?

Yes. Upload the .vob file from a DVD's VIDEO_TS folder and convert it to MP4. This digitises DVD video into a single compact, modern file you can store, stream or edit. Note that copy-protected commercial discs cannot be converted.

Will the MP4 keep the same aspect ratio?

Yes. The converter preserves your video's original aspect ratio by default. When you choose a target resolution it scales by height and keeps width proportional (using an even-pixel constraint), so the picture is never stretched or squashed unless you set a custom width and height yourself.

Does converting to MP4 lose audio?

No — audio is kept by default. You can re-encode it to AAC, MP3, Opus or AC-3, keep the original track with "Copy", or deliberately remove it with "No audio". If a converted file is unexpectedly silent, check that the audio codec is not set to "No audio".

Can I convert video to MP4 on a Mac, Windows or Linux?

Yes. Because it runs in the browser, the converter works identically on Windows, macOS, Linux, ChromeOS and mobile operating systems. Any up-to-date browser with WebAssembly support (Chrome, Edge, Firefox, Safari) can run it.

Can I convert 4K video to MP4?

Yes. 4K (2160p) conversion is supported. Because 4K files are large and processing happens on your device, use a desktop or laptop for the best speed, and expect longer encode times than 1080p. You can also downscale 4K to 1080p to dramatically reduce the file size.

What is the best format to convert video to?

For almost everyone, MP4 with H.264 video and AAC audio is the best target format. It plays on every modern device and platform, streams well, compresses efficiently and is the recommended upload format for YouTube, Instagram, TikTok, Facebook and more.

How do I reduce video file size while converting to MP4?

Use the Smallest Size preset, or in Advanced settings lower the resolution (for example 1080p to 720p), increase the CRF value (try 28–30), switch to the H.265 codec, and reduce the audio bitrate. Each of these shrinks the MP4; combining them gives the biggest savings.

How do I convert video to MP4 for WhatsApp?

Pick the WhatsApp preset, which outputs a small 480p H.264 MP4 that sends quickly and stays under messaging size limits. If you need higher quality, 720p still works on WhatsApp but produces a larger file.

How do I convert video to MP4 for email?

Choose the Email preset (360p, low bitrate) to keep the MP4 small enough for typical 20–25 MB attachment limits. For longer clips, trim the video or share a download link instead, since email size caps are strict.

Why is my converted MP4 bigger than the original?

This usually happens when the source was already heavily compressed (for example a small WEBM or H.265 file) and you re-encoded it to H.264 at a high quality. To avoid it, raise the CRF, lower the resolution or bitrate, or choose H.265 — or use "Copy" if you only need to change the container.

Can I convert several videos to MP4 at once?

Yes. Add multiple files and they queue up and convert one after another, each with its own progress bar. When the batch finishes you can download files individually or download all of them together as a single ZIP archive.

Does the converter work offline?

After the page and the conversion engine have loaded once, conversions run entirely on your device and do not need an active connection to process your video. The one-time engine download (~32 MB) happens on your first conversion and is then cached by the browser.

Is converting video to MP4 legal?

Converting videos you own or have the right to use is completely legal. What is not permitted is bypassing copy protection (DRM) on commercial discs or streaming services. This tool does not remove DRM and is intended for your own footage and properly licensed content.

What browsers support this MP4 converter?

Any modern browser with WebAssembly support works, including Google Chrome, Microsoft Edge, Mozilla Firefox, Safari, Brave and Opera, on both desktop and mobile. For the heaviest files, a desktop Chromium-based browser tends to be fastest.

How do I rotate or flip a video while converting to MP4?

Open Advanced settings and use the Rotate buttons (90°, 180°, 270°) and the Flip H/V toggles. The rotation or flip is baked into the output MP4 during the same conversion pass, so there is no separate step and no extra quality loss.

Video to MP4 Converter Free Online – Convert AVI, MOV, MKV to MP4

Why this is the best free Video to MP4 converter

100% Private

Conversion runs in your browser with WebAssembly FFmpeg. Your video never leaves your device.

No Upload Wait

There is nothing to upload — processing starts the moment you hit convert.

Batch Queue

Convert dozens of videos in one go and download them all as a single ZIP.

Full Control

Pick the codec, resolution, frame rate, bitrate and audio — or just use a one-click preset.

Trim, Crop & Rotate

Edit while you convert: trim, crop, rotate, flip, change speed and adjust volume.

No Watermark

Free, unlimited and watermark-free — keep your video exactly as it should be.

20+ Input Formats

AVI, MOV, MKV, WMV, FLV, WEBM, TS, VOB, 3GP and many more all convert to MP4.

Smart Presets

Optimised one-click presets for YouTube, Instagram, TikTok, WhatsApp, email and more.

What is a Video to MP4 Converter?

A Video to MP4 converter transforms a video file from formats like AVI, MOV, MKV, WMV, FLV, WEBM, MPEG, TS or 3GP into MP4 — the MPEG-4 Part 14 container that has become the universal standard for digital video. MP4 is supported by virtually every smartphone, tablet, computer, smart TV, browser and social network on the planet, which is why "convert to MP4" is one of the most common video tasks.

This particular converter is different from cloud services such as CloudConvert, Zamzar, Convertio or FreeConvert: instead of uploading your video to a remote server, it runs FFmpeg compiled to WebAssembly directly inside your web browser. Your file is decoded, transcoded and re-packaged on your own device and never touches the internet — giving you a fast, private, watermark-free MP4 with full control over codec, resolution, frame rate, bitrate and audio.

How to Convert Video to MP4

Converting any video to MP4 takes three simple steps and no technical knowledge:

1. Add your videoDrag and drop one or more files onto the upload area, click to browse, paste a file, or import from a direct URL. AVI, MOV, MKV, WMV, FLV, WEBM and 15+ other formats are accepted.

2. Choose your settingsKeep the Balanced preset for a great all-round result, pick a platform preset (YouTube, Instagram, TikTok…), or open Advanced settings to fine-tune codec, resolution, frame rate, bitrate, trimming and more.

3. Convert and downloadPress Convert and watch the live progress bar. When it finishes, download your MP4 directly, share it, or — for batches — download every file at once in a ZIP.

Why Use the MP4 Format

MP4 wins because it offers the best combination of compatibility, quality and file size. It can carry the most popular modern codecs — H.264 (AVC), H.265 (HEVC) and AV1 for video, and AAC, MP3, Opus or AC-3 for audio — inside a single container that every device understands.

MP4 also supports fast-start streaming, hardware-accelerated playback on phones and laptops, embedded metadata, and efficient compression that keeps files small without obvious quality loss. Whether you are uploading to social media, emailing a clip, editing in professional software or simply trying to make a video play on a TV, MP4 is the format least likely to cause problems.

Best MP4 Settings for Every Use Case

The right settings depend on what you are doing with the video. As a rule of thumb, choose H.264 + AAC for maximum compatibility, lower the resolution and raise the CRF to make smaller files, and only reach for H.265 or AV1 when file size matters more than encoding speed.

Web & socialH.264, 1080p, 30 fps, CRF 23, AAC 128 kbps, fast-start on. The Web, YouTube, Instagram and TikTok presets apply this automatically.

Smallest fileH.265, 720p, CRF 28–30, AAC 96 kbps. Cuts size dramatically for storage, email or messaging.

Maximum qualityH.264, original resolution, CRF 17, AAC 256 kbps, slow preset. Near-lossless for archiving or re-editing.

Fastest conversionH.264, "ultrafast" preset, or "Copy (remux)" when the source is already H.264 — this rewraps to MP4 in seconds with no quality loss.

Convert to MP4 in 3 steps

Add your video file

Drag and drop your AVI, MOV, MKV, WMV, FLV or WEBM file onto the converter, or click to browse. You can add multiple files for batch conversion.

Choose conversion settings

Use the Balanced preset, pick a platform preset, or open Advanced settings to select the codec, resolution, frame rate, bitrate and audio options.

Convert to MP4 and download

Press Convert to transcode the video in your browser, then download the finished MP4 individually or as a ZIP for batches.

Supported Video Formats

Convert any of these formats to MP4 — and re-encode existing MP4 files to change codec, size or quality.

AVIMP4

MOVMP4

MKVMP4

WMVMP4

FLVMP4

WEBMMP4

M4VMP4

MPEGMP4

MPGMP4

3GPMP4

OGVMP4

TSMP4

MTSMP4

M2TSMP4

VOBMP4

ASFMP4

F4VMP4

DVMP4

RMVBMP4

AVCHDMP4

MP4 vs Other Video Formats

How does MP4 compare with AVI, MOV, MKV, WEBM and WMV for compatibility, file size and quality? Here is a side-by-side breakdown.

Format	Compatibility	File size	Quality	Best for
MP4BEST	Excellent	Small	Excellent	Universal use
AVI	Medium	Large	Good	Legacy systems
MOV	High	Medium	Excellent	Apple devices
MKV	Medium	Medium	Excellent	High-quality storage
WEBM	Browser-focused	Small	Good	Web streaming
WMV	Legacy	Medium	Good	Windows systems

MP4 is the clear all-rounder: it combines excellent device and browser compatibility with efficient compression, so you get small files without sacrificing quality. That is exactly why it is the recommended upload format for nearly every social and streaming platform.

AVI and WMV are older Microsoft formats that still appear on legacy systems and cameras, but they are larger and far less portable than MP4. MOV (Apple/QuickTime) and MKV (Matroska) deliver superb quality and are great for editing or archiving, yet MKV in particular is not playable on many phones, TVs and browsers. WEBM is excellent for the open web but is not universally accepted outside browsers. Converting any of these to MP4 trades a little re-encoding time for the broadest possible compatibility.

Common Reasons to Convert Video to MP4

Video won't play on your phone

Phones natively play MP4. Converting an AVI, MKV or WMV to MP4 makes it open instantly in the gallery and messaging apps.

Video won't upload to YouTube

YouTube prefers MP4 (H.264 + AAC). Converting first avoids failed or slow uploads and processing errors.

Your TV doesn't support the format

Smart TVs and media players are picky. An MP4 file plays from USB or DLNA on virtually every television.

You need a smaller file size

MP4 with H.264 or H.265 compresses efficiently, shrinking bulky AVI or MOV files for storage and sharing.

You need better compatibility

MP4 is the safest format to send to anyone — it just works across Windows, Mac, iOS, Android and the web.

Social media requirements

Instagram, TikTok, Facebook and X all recommend MP4. Converting ensures your post is accepted and looks right.

Email attachment limits

Convert and compress to MP4 to fit within strict 20–25 MB email attachment caps without losing watchable quality.

Website video optimization

MP4 supports fast-start streaming, so embedded videos start playing immediately and load faster for visitors.

Video Codec Guide

Which codec should you choose when converting to MP4? Each balances compatibility, file size and encoding speed differently.

H.264 / AVC

Recommended

The most widely supported video codec in the world. Hardware-accelerated on virtually every phone, computer, TV and browser.

When to use: Use H.264 unless you have a specific reason not to. It is the safest choice for sharing, uploading and universal playback.

H.265 / HEVC

Efficient

Produces roughly 40–50% smaller files than H.264 at the same visual quality, at the cost of slower encoding and slightly less universal support.

When to use: Choose H.265 when small file size matters most — archiving, 4K storage or limited bandwidth — and your target devices support HEVC.

AV1

Newest

A modern, royalty-free codec with the best compression efficiency available, ideal for web delivery. It is also the slowest to encode.

When to use: Use AV1 for web-first content where bandwidth savings outweigh encoding time, and your viewers use recent browsers and devices.

MPEG-4 Part 2

Legacy

An older codec kept for compatibility with legacy hardware and very old media players that predate H.264.

When to use: Only pick MPEG-4 for old devices that cannot decode H.264. For everything else, H.264 looks better at the same size.

MP4 Resolution Guide

Pick a resolution to balance quality and file size. Lower resolutions make smaller MP4s; higher resolutions keep more detail.

240p426×240

Quality: Low
File size: Tiny
Use case: Previews and very slow connections

360p640×360

Quality: Basic
File size: Small
Use case: Messaging and low-data sharing

480p854×480

Quality: Standard (SD)
File size: Small
Use case: Email and quick uploads

720p1280×720

Quality: HD
File size: Medium
Use case: Social media and web video

1080p1920×1080

Quality: Full HD
File size: Medium–large
Use case: YouTube and most modern screens

1440p2560×1440

Quality: 2K / QHD
File size: Large
Use case: High-detail YouTube and monitors

4K3840×2160

Quality: Ultra HD
File size: Very large
Use case: Premium content and large TVs

MP4 File Size Estimator

Roughly how big will your MP4 be? These approximate sizes assume typical H.264 bitrates — your real result varies with content, motion and the CRF or bitrate you choose.

1 minute · 720p

~30–50 MB

≈ 5 Mbps H.264

1 minute · 1080p

~50–90 MB

≈ 8 Mbps H.264

1 minute · 4K

~250–400 MB

≈ 35 Mbps H.264

10 minutes · 720p

~300–500 MB

≈ 5 Mbps H.264

10 minutes · 1080p

~0.5–1 GB

≈ 8 Mbps H.264

10 minutes · 4K

~2.5–4 GB

≈ 35 Mbps H.264

MP4 Plays on Every Device

Once your video is an MP4 (H.264 + AAC) it plays natively across desktops, phones, tablets, consoles, smart TVs and browsers — no extra codecs or apps required.

Windows

macOS

Linux

Android

iPhone

iPad

Smart TVs

PlayStation

Xbox

Chrome

Firefox

Safari

Edge

Social Media Video Requirements

Every major platform recommends MP4. Use these formats and resolutions for the cleanest uploads — the matching presets set them automatically.

Platform	Recommended format	Resolution
YouTube	MP4 (H.264 + AAC)	1080p or higher
Instagram	MP4 (H.264 + AAC)	1080×1920 (vertical)
TikTok	MP4 (H.264 + AAC)	1080×1920 (vertical)
Facebook	MP4 (H.264 + AAC)	1080p
X / Twitter	MP4 (H.264 + AAC)	1080p
LinkedIn	MP4 (H.264 + AAC)	1080p

Privacy First: No Upload, No Tracking

Unlike cloud converters that send your video to a remote server, this tool processes everything locally. Your footage stays yours.

No upload requiredYour video is never sent anywhere — there is no upload step at all.

Files stay on your deviceThe original and the MP4 live only in your browser, never on a server.

Browser-based processingAll transcoding happens locally using your device's own processor.

FFmpeg WebAssemblyReal FFmpeg compiled to Wasm runs the conversion right inside the page.

No account requiredNo sign-up, no email, no login — just open the page and convert.

No file retentionNothing is stored or logged; files are released when you close the tab.

How Video Conversion Technology Works

How does FFmpeg convert video to MP4?

FFmpeg is the industry-standard open-source engine behind most video software. To make an MP4 it decodes the frames and audio from your source file, applies any filters you chose (scaling, cropping, rotating, changing frame rate or speed), re-encodes the video with a codec such as H.264 and the audio with AAC, and writes everything into the MP4 container — adding a fast-start index so it can stream.

How does video conversion work in the browser?

Normally FFmpeg runs as a native program. Here it is compiled to WebAssembly, a portable binary format that browsers execute at near-native speed. Your browser reads the file you select, hands its bytes to the Wasm FFmpeg module, runs the exact same conversion logic in a background worker thread, and returns the finished MP4 as a downloadable blob — all without a server.

How does WebAssembly make conversion fast?

WebAssembly is a low-level, pre-compiled instruction format that runs far faster than ordinary JavaScript and close to the speed of native code. It lets a heavy, CPU-intensive program like FFmpeg run efficiently inside a sandboxed browser tab, so genuine video transcoding becomes practical on the client side.

Why is local conversion safer than cloud conversion?

With local conversion your video never travels across the internet, is never stored on a third-party server and is never exposed to that server's staff, logs, breaches or retention policies. The only copy of your file is the one on your own device, which is the strongest possible privacy guarantee for sensitive footage.

What are the benefits compared to cloud converters?

Cloud converters add upload time, queue waits, file-size and daily limits, watermarks on some free tiers, and the privacy risk of handing your video to a remote service. In-browser conversion removes all of that: there is no upload, no waiting in a queue, no artificial per-file cap, no watermark and no data leaving your device — the trade-off is that it uses your own computer's processing power.

15 Pro Tips for Converting Video to MP4

1Default to H.264 for sharingIt plays on everything and encodes quickly — the safest codec for videos you will send or upload.

2Use CRF instead of a fixed bitrateLeave bitrate on Auto (CRF). CRF 23 is the sweet spot; 18–20 is near-lossless, 28+ is small but softer.

3Best YouTube settingsMP4, H.264, 1080p (or higher), 30 fps, AAC 192 kbps, fast-start on. The YouTube preset sets this for you.

4Best TikTok / Instagram Reels settings1080×1920 vertical, H.264, 30 fps, AAC 128 kbps. Use the TikTok or Instagram preset.

5Fastest possible conversionSet the encode speed to “ultrafast”, or use Copy (remux) when the source is already H.264 to skip re-encoding.

6Smallest possible fileSwitch to H.265, drop to 720p, raise CRF to 28–30 and lower audio to 96 kbps. Combine all four for maximum savings.

7Highest possible qualityH.264 at original resolution, CRF 17, slow preset, AAC 256 kbps. Larger file, near-lossless result.

8Lower the frame rate to save spaceGoing from 60 fps to 30 fps roughly halves the motion data and noticeably shrinks the MP4.

9Downscale before lowering bitrateReducing 4K to 1080p saves far more space than squeezing the bitrate while keeping 4K resolution.

10Keep audio with “Copy” when possibleIf you only need a new container or video codec, copying the audio avoids a second re-encode and keeps it pristine.

11Trim first, then convertCutting unwanted intro/outro seconds before converting reduces both encode time and final size.

12Enable fast-start for webFast-start (moov atom at the front) lets a video begin playing before it finishes downloading — keep it on for uploads.

13Use a desktop for big filesLarge or 4K conversions are much faster on a laptop or desktop than on a phone, which has less memory and slower CPU.

14Convert in batchesQueue many files at once and grab them all in a single ZIP instead of converting and downloading one by one.

15Add a tiny quality buffer for re-uploadsPlatforms re-compress your video, so encode one step above your target quality (e.g. CRF 21) to survive their second pass.

Frequently Asked Questions

A Video to MP4 converter is a tool that changes a video from one container format — such as AVI, MOV, MKV, WMV, FLV or WEBM — into the MP4 (MPEG-4 Part 14) format. MP4 is the most widely supported video format on the web, mobile devices, social platforms and video players, so converting to MP4 makes a file play almost anywhere. This converter does the entire job inside your browser, so your video is never uploaded to a server.

Troubleshooting Guide

Why this is the best free Video to MP4 converter

100% Private

Conversion runs in your browser with WebAssembly FFmpeg. Your video never leaves your device.

No Upload Wait

There is nothing to upload — processing starts the moment you hit convert.

Batch Queue

Convert dozens of videos in one go and download them all as a single ZIP.

Full Control

Pick the codec, resolution, frame rate, bitrate and audio — or just use a one-click preset.

Trim, Crop & Rotate

Edit while you convert: trim, crop, rotate, flip, change speed and adjust volume.

No Watermark

Free, unlimited and watermark-free — keep your video exactly as it should be.

20+ Input Formats

AVI, MOV, MKV, WMV, FLV, WEBM, TS, VOB, 3GP and many more all convert to MP4.

Smart Presets

Optimised one-click presets for YouTube, Instagram, TikTok, WhatsApp, email and more.

What is a Video to MP4 Converter?

How to Convert Video to MP4

Converting any video to MP4 takes three simple steps and no technical knowledge:

3. Convert and downloadPress Convert and watch the live progress bar. When it finishes, download your MP4 directly, share it, or — for batches — download every file at once in a ZIP.

Why Use the MP4 Format

Best MP4 Settings for Every Use Case

Web & socialH.264, 1080p, 30 fps, CRF 23, AAC 128 kbps, fast-start on. The Web, YouTube, Instagram and TikTok presets apply this automatically.

Smallest fileH.265, 720p, CRF 28–30, AAC 96 kbps. Cuts size dramatically for storage, email or messaging.

Maximum qualityH.264, original resolution, CRF 17, AAC 256 kbps, slow preset. Near-lossless for archiving or re-editing.

Fastest conversionH.264, "ultrafast" preset, or "Copy (remux)" when the source is already H.264 — this rewraps to MP4 in seconds with no quality loss.

Convert to MP4 in 3 steps

Add your video file

Drag and drop your AVI, MOV, MKV, WMV, FLV or WEBM file onto the converter, or click to browse. You can add multiple files for batch conversion.

Choose conversion settings

Use the Balanced preset, pick a platform preset, or open Advanced settings to select the codec, resolution, frame rate, bitrate and audio options.

Convert to MP4 and download

Press Convert to transcode the video in your browser, then download the finished MP4 individually or as a ZIP for batches.

Supported Video Formats

Convert any of these formats to MP4 — and re-encode existing MP4 files to change codec, size or quality.

AVIMP4

MOVMP4

MKVMP4

WMVMP4

FLVMP4

WEBMMP4

M4VMP4

MPEGMP4

MPGMP4

3GPMP4

OGVMP4

TSMP4

MTSMP4

M2TSMP4

VOBMP4

ASFMP4

F4VMP4

DVMP4

RMVBMP4

AVCHDMP4

MP4 vs Other Video Formats

How does MP4 compare with AVI, MOV, MKV, WEBM and WMV for compatibility, file size and quality? Here is a side-by-side breakdown.

Format	Compatibility	File size	Quality	Best for
MP4BEST	Excellent	Small	Excellent	Universal use
AVI	Medium	Large	Good	Legacy systems
MOV	High	Medium	Excellent	Apple devices
MKV	Medium	Medium	Excellent	High-quality storage
WEBM	Browser-focused	Small	Good	Web streaming
WMV	Legacy	Medium	Good	Windows systems

Common Reasons to Convert Video to MP4

Video won't play on your phone

Phones natively play MP4. Converting an AVI, MKV or WMV to MP4 makes it open instantly in the gallery and messaging apps.

Video won't upload to YouTube

YouTube prefers MP4 (H.264 + AAC). Converting first avoids failed or slow uploads and processing errors.

Your TV doesn't support the format

Smart TVs and media players are picky. An MP4 file plays from USB or DLNA on virtually every television.

You need a smaller file size

MP4 with H.264 or H.265 compresses efficiently, shrinking bulky AVI or MOV files for storage and sharing.

You need better compatibility

MP4 is the safest format to send to anyone — it just works across Windows, Mac, iOS, Android and the web.

Social media requirements

Instagram, TikTok, Facebook and X all recommend MP4. Converting ensures your post is accepted and looks right.

Email attachment limits

Convert and compress to MP4 to fit within strict 20–25 MB email attachment caps without losing watchable quality.

Website video optimization

MP4 supports fast-start streaming, so embedded videos start playing immediately and load faster for visitors.

Video Codec Guide

Which codec should you choose when converting to MP4? Each balances compatibility, file size and encoding speed differently.

H.264 / AVC

Recommended

The most widely supported video codec in the world. Hardware-accelerated on virtually every phone, computer, TV and browser.

When to use: Use H.264 unless you have a specific reason not to. It is the safest choice for sharing, uploading and universal playback.

H.265 / HEVC

Efficient

Produces roughly 40–50% smaller files than H.264 at the same visual quality, at the cost of slower encoding and slightly less universal support.

When to use: Choose H.265 when small file size matters most — archiving, 4K storage or limited bandwidth — and your target devices support HEVC.

AV1

Newest

A modern, royalty-free codec with the best compression efficiency available, ideal for web delivery. It is also the slowest to encode.

When to use: Use AV1 for web-first content where bandwidth savings outweigh encoding time, and your viewers use recent browsers and devices.

MPEG-4 Part 2

Legacy

An older codec kept for compatibility with legacy hardware and very old media players that predate H.264.

When to use: Only pick MPEG-4 for old devices that cannot decode H.264. For everything else, H.264 looks better at the same size.

MP4 Resolution Guide

Pick a resolution to balance quality and file size. Lower resolutions make smaller MP4s; higher resolutions keep more detail.

240p426×240

Quality: Low
File size: Tiny
Use case: Previews and very slow connections

360p640×360

Quality: Basic
File size: Small
Use case: Messaging and low-data sharing

480p854×480

Quality: Standard (SD)
File size: Small
Use case: Email and quick uploads

720p1280×720

Quality: HD
File size: Medium
Use case: Social media and web video

1080p1920×1080

Quality: Full HD
File size: Medium–large
Use case: YouTube and most modern screens

1440p2560×1440

Quality: 2K / QHD
File size: Large
Use case: High-detail YouTube and monitors

4K3840×2160

Quality: Ultra HD
File size: Very large
Use case: Premium content and large TVs

MP4 File Size Estimator

Roughly how big will your MP4 be? These approximate sizes assume typical H.264 bitrates — your real result varies with content, motion and the CRF or bitrate you choose.

1 minute · 720p

~30–50 MB

≈ 5 Mbps H.264

1 minute · 1080p

~50–90 MB

≈ 8 Mbps H.264

1 minute · 4K

~250–400 MB

≈ 35 Mbps H.264

10 minutes · 720p

~300–500 MB

≈ 5 Mbps H.264

10 minutes · 1080p

~0.5–1 GB

≈ 8 Mbps H.264

10 minutes · 4K

~2.5–4 GB

≈ 35 Mbps H.264

MP4 Plays on Every Device

Once your video is an MP4 (H.264 + AAC) it plays natively across desktops, phones, tablets, consoles, smart TVs and browsers — no extra codecs or apps required.

Windows

macOS

Linux

Android

iPhone

iPad

Smart TVs

PlayStation

Xbox

Chrome

Firefox

Safari

Edge

Social Media Video Requirements

Every major platform recommends MP4. Use these formats and resolutions for the cleanest uploads — the matching presets set them automatically.

Platform	Recommended format	Resolution
YouTube	MP4 (H.264 + AAC)	1080p or higher
Instagram	MP4 (H.264 + AAC)	1080×1920 (vertical)
TikTok	MP4 (H.264 + AAC)	1080×1920 (vertical)
Facebook	MP4 (H.264 + AAC)	1080p
X / Twitter	MP4 (H.264 + AAC)	1080p
LinkedIn	MP4 (H.264 + AAC)	1080p