Will compression reduce quality?

Re-encoding always discards some data, but with CRF encoding the loss is usually invisible. Higher-quality modes stay close to the original; Maximum trades a little visible quality for the smallest file. Lossless Optimize re-wraps the streams with zero re-encoding and therefore zero quality loss. The live estimator labels the expected quality so you can stop before it dips.

What is the best video format?

MP4 with H.264 is the best all-round choice — it plays on virtually every device, browser, player and social platform. Use H.265 or AV1 when shrinking the file matters more than supporting very old hardware, WEBM (VP9) for the royalty-free open web, or MOV for Apple and pro editing workflows.

How much can a video be compressed?

It depends on the source. Phone and drone footage, screen recordings and GoPro clips are often over-bitrate and can shrink 80–90% with no obvious quality loss. Already-compressed web videos have less room — typically 30–60%. The live estimator shows the expected savings before you start.

Is this video compressor free?

Yes. Compressing videos here is free with no account, no watermark and no artificial file-count cap. It is supported by unobtrusive advertising and an optional Pro plan, but the core compression is free forever.

Yes. Compression runs entirely on your device using FFmpeg compiled to WebAssembly. Your file is read in the browser, re-encoded locally, and offered back as a download. Nothing is sent to us or any third party, which makes it private and GDPR-friendly by design.

Can I compress MP4 videos?

Yes. Drop an MP4 in, keep MP4 as the output (or pick another container), choose a mode or target size, and compress. MP4-to-MP4 compression re-encodes the video with a more efficient bitrate or codec to make it smaller.

Can I compress videos for WhatsApp?

Yes. Use the WhatsApp preset or set a 16 MB target. It compresses to roughly 480–720p H.264 with lighter audio so the clip sends without WhatsApp’s aggressive re-compression ruining it, and sends faster on mobile data.

Can I compress videos for email?

Yes. Choose the Email preset or set a 10 MB target size, and compress. The tool lowers the resolution to around 360–480p and trims the audio bitrate so the result fits comfortably under Gmail’s 25 MB and Outlook’s 20 MB attachment limits.

Can I compress a video to a specific size like 25 MB?

Yes. Switch to “Target file size”, pick a preset such as 25 MB or type a custom value, and the tool calculates the bitrate needed for your clip’s length to land near that size. Enable two-pass encoding for the most accurate result. Ideal for hitting email, WhatsApp or Discord limits.

How do I reduce video size without losing quality?

Use a CRF-based mode such as Balanced or High Quality. CRF encoding targets a constant perceived quality and only spends the bits each scene needs, so a file can often be halved with no visible difference. Downscaling resolution and switching to an efficient codec like H.265 also shrink files with minimal quality impact.

Which formats can I compress?

You can compress MP4, MOV, AVI, MKV, WEBM, FLV, WMV, M4V, MPEG, MPG, 3GP, OGV, TS, MTS, M2TS, VOB, ASF, F4V, DV and AVCHD. You can keep the original container or output to MP4, MKV, WEBM or MOV.

Can I compress multiple videos at once?

Yes. Add as many files as you like — or drop a whole folder — and the batch queue compresses them with live progress for each. You can reorder, pause and resume the queue, then download files individually or grab them all as a single ZIP.

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

H.264 (AVC) is the most compatible codec and encodes quickly — the recommended default. H.265 (HEVC) makes files roughly 40–50% smaller at the same quality but encodes slower and needs a modern device. AV1 is the most efficient (around 50% smaller) but the slowest to encode and best for web delivery to newer browsers.

What is CRF and which value should I use?

CRF (Constant Rate Factor) controls quality for H.264/H.265. Lower numbers mean higher quality and bigger files. CRF 18 is visually lossless, 23–26 is the compression sweet spot, and 30+ is noticeably compressed but tiny. For most sharing, 24–26 gives a big size cut with quality you can barely tell apart.

What is the difference between CBR, VBR and CRF?

CRF targets a constant perceived quality and lets the bitrate vary — best for general use. VBR (variable bitrate) aims at an average bitrate while letting it rise and fall with scene complexity. CBR (constant bitrate) holds a near-fixed rate, which some platforms and streaming setups require. You can choose the rate-control mode in Advanced settings.

What does two-pass encoding do?

Two-pass encoding analyses the whole video first (pass 1) and then encodes it (pass 2) using that analysis to spend the bit budget optimally. It lands much closer to a requested target size at better quality than a single pass — at the cost of taking roughly twice as long. It applies when you set a target bitrate or file size.

Can I trim, crop or rotate while compressing?

Yes. The advanced tools let you trim the start and end, crop to a region, rotate in 90° steps, flip, change playback speed and adjust volume — all applied in the same compression pass, so there is no extra quality loss.

Can I compress only the audio or only the video?

Yes. “Video only” strips the audio track entirely for the smallest possible file, while “Audio only” keeps the video stream untouched and re-encodes just the audio. You can also re-encode audio to AAC, MP3, Opus or AC-3 at 64–320 kbps, downmix to stereo or mono, or remove it.

Does compression remove metadata?

Re-encoding produces a clean file and drops most non-essential metadata by default. You can also explicitly keep metadata or strip all of it with the Preserve/Remove metadata toggle in Advanced settings.

How do I compress a 4K video?

Add the 4K file and either downscale it to 1080p (a huge size saving for phone and laptop viewing) or keep 4K and use H.265 with a higher CRF. The Automatic mode detects very large 4K sources and tunes the settings for you.

Is there a file-size limit?

Because compression happens in your browser, the practical limit is your device’s memory rather than a server cap. Most browsers comfortably handle files up to a couple of gigabytes; for very large 4K videos, use a desktop browser and close other heavy tabs.

How long does compression take?

It depends on the video length, resolution, codec and your device. H.264 at a fast effort is quickest; H.265 and AV1 take longer. A short 1080p clip usually finishes in well under a minute. A live progress bar, ETA and processing status keep you informed, and a multi-threaded engine uses several cores where the browser supports it.

Does it work on mobile phones?

Yes. The compressor runs in mobile Chrome, Safari and other modern browsers. For long or 4K videos a desktop is faster and less memory-constrained, but short clips compress fine on a phone — there is even a QR code to open the tool on another device.

Why did my compressed file get bigger?

This is rare and usually means the source was already heavily compressed and you chose a high-quality setting. The estimator warns you when settings would grow a file — lower the quality (higher CRF), downscale, or pick a more efficient codec to shrink it.

Can I cancel a compression in progress?

Yes. Press Cancel at any time to stop the current job, or pause and resume the whole batch queue. The file returns to Ready so you can adjust settings and try again — nothing is left half-written.

Does the tool add a watermark?

Never. The compressor does not add any watermark, logo or branding to your video. The output looks exactly like the source, just smaller. It also cannot remove a watermark already baked into the footage, since that is part of the picture.

Will the video still play after compression?

Yes. Compressing to MP4 with H.264 produces a file that plays on virtually every device, browser, player and social platform. If you choose an efficient codec like H.265 or AV1, make sure your target device supports it.

Is there an API for video compression?

A REST video-compression API (POST /api/video/compress) is on our roadmap for developers — with API-key authentication, rate limiting, usage tracking, batch jobs and team/enterprise plans for high-volume, server-side use. The browser tool on this page is free and unlimited for interactive use today.

How do I compress a MOV file from my iPhone?

Add the .mov file and compress to MP4 (recommended) or keep MOV. iPhone footage is often high-bitrate HEVC or H.264, so it compresses substantially — the Automatic mode tunes the settings to the clip for you.

Video Compressor — Compress Video Online Free, No Quality Loss

How to compress a video in 6 steps

Upload your video

Drag and drop your video onto the box, click to browse, paste a file, upload a whole folder, or import from a URL. The tool instantly reads the resolution, duration, codec, frame rate and bitrate.

Choose a compression method

Pick a compression mode — Automatic, Smart, Fast, Balanced, High Quality, Maximum, Lossless or Custom — or apply a one-click preset for WhatsApp, YouTube, Instagram, email and more.

Adjust the settings

Set a target file size or quality, then optionally fine-tune resolution, codec (H.264/H.265/AV1/VP9), frame rate, bitrate mode (CRF/VBR/CBR), audio and metadata. The live estimator shows the size you will save.

Compress

Press Compress. FFmpeg re-encodes the video locally with a live progress bar, ETA and processing status — single files or a whole batch queue at once.

Preview the results

Compare before and after side by side, with the original size, compressed size, reduction percentage, compression ratio and estimated quality.

Download

Download each compressed video, grab the whole batch as a ZIP, or compress again with different settings. Nothing is stored once you leave the page.

What Is a Video Compressor?

A video compressor is an online tool that reduces the file size of a video while keeping it watchable. It re-encodes the footage with a more efficient codec, a lower bitrate, a smaller resolution, or all three at once, so the result takes up far less space and is much easier to email, message, upload or store.

This free video compressor does the whole job inside your browser using FFmpeg compiled to WebAssembly — the same engine behind YouTube, VLC and most professional video pipelines. Nothing is uploaded, there is no watermark, no sign-up and no file-count limit. Your device does the work, privately.

You can compress MP4, MOV, AVI, MKV, WEBM, FLV, WMV, M4V, MPEG, 3GP, OGV and TS (plus more), shrink a clip to an exact target size for a platform limit, batch-process a folder of videos, and download everything individually or as a ZIP — all for free.

How Video Compression Works

A raw video is enormous — thousands of full-resolution images per second plus audio — so every video you watch is already compressed. A compressor simply trades a little visual data you are unlikely to notice for a much smaller, more shareable file. Four levers control how small a video becomes, and this tool lets you pull each one automatically or by hand:

Bitrate

Bitrate is the data used per second of video — the single biggest driver of file size. Lower it directly, target a file size, or use a quality (CRF) level and the encoder allocates bits intelligently, keeping detail where the eye notices most.

Codec

Modern codecs like H.265 (HEVC) and AV1 pack the same quality into roughly half the bits of older H.264 or MPEG-4. Switching codec is a free size win on capable devices.

Resolution

Scaling a 4K clip to 1080p, or 1080p to 720p, removes pixels you may not need on a phone screen and shrinks the file dramatically — often the fastest route to a big size cut.

Frame rate & audio

Dropping a 60 fps screen recording to 30 fps roughly halves the motion data, and re-encoding audio to efficient AAC/Opus at 96–128 kbps (or muting silent footage) trims more bytes with no visible impact.

Codec	Efficiency	Speed	Compatibility	Best for
H.264 / AVC	Baseline	Fastest	Universal — every device & browser	Safe default, sharing, compatibility
H.265 / HEVC	~40–50% smaller	Slower	Most modern devices	Big size cuts at the same quality
AV1	~50% smaller	Slowest	Newer browsers & devices	Maximum efficiency for the web
VP9	~30–40% smaller	Slower	Chrome, Firefox, Android, WebM	Royalty-free open-web delivery
MPEG-4	Least efficient	Very fast	Legacy hardware	Old players & devices only

Why Reduce Video File Size?

Smaller videos are easier to share, faster to move and cheaper to keep. Reducing video file size helps in almost every workflow:

Save storage

Compressed videos take far less room on your phone, laptop, SD card or cloud drive — fit more clips in the same space.

Faster uploads & downloads

A lighter file uploads to YouTube, Drive or social media in a fraction of the time, is less likely to fail on a weak connection, and starts playing for viewers sooner — fast-start keeps playback instant.

Fit attachment & chat limits

Squeeze a clip under Gmail’s 25 MB, WhatsApp’s 16 MB or Discord’s 25 MB cap so it actually sends instead of being rejected.

Better website performance

Lighter videos improve Core Web Vitals, reduce bandwidth bills and keep pages fast for everyone who visits.

4K phone clip · 1 min

~350 MB→ ~45 MB

~87% smaller

1080p screen recording · 5 min

~600 MB→ ~70 MB

~88% smaller

1080p drone footage · 2 min

~480 MB→ ~80 MB

~83% smaller

GoPro 1080p60 · 3 min

~700 MB→ ~95 MB

~86% smaller

Old AVI movie · 90 min

~1.4 GB→ ~480 MB

~66% smaller

720p webcam · 10 min

~900 MB→ ~120 MB

~87% smaller

Best Compression Settings

There is no single “best” setting — the right choice depends on where the video is going. As a rule of thumb, H.264 + CRF 23–26 halves most files with quality you can barely tell apart, while H.265 or AV1 give the biggest savings for storage on modern devices. The Best Settings table on this page lists ideal choices per use-case, and the live estimator labels the expected quality of every setting so you can push the size down with confidence.

For exact platform limits, switch to Target file size and the encoder calculates the bitrate needed for your clip’s length to land near 5, 10, 16, 25, 50, 100 or 250 MB — or any custom number. For repeatable, accurate sizing on important clips, enable two-pass encoding.

Use case	Resolution	Codec	Quality	Notes
Email attachment	360–480p	H.264	Target 10 MB	Fits under Gmail/Outlook limits with audio at 64–96 kbps.
WhatsApp / Telegram	480–720p	H.264	Target 16 MB	Lands under the 16 MB send cap; stays sharp on phones.
Discord (free)	720p	H.264	Target 25 MB	Matches the free 25 MB upload limit.
YouTube	1080p	H.264	CRF 21 (High)	High quality for re-encoding; YouTube compresses again on upload.
TikTok / Reels / Shorts	1080p vertical	H.264	CRF 22–24	Light compression keeps detail through the platform’s own pass.
Website / streaming	720–1080p	H.264 / H.265	CRF 24–26 + fast-start	Fast-start lets playback begin before the file finishes loading.
Long-term storage	Original	H.265 / AV1	CRF 26–30 (Maximum)	Most efficient codecs give the biggest archival space savings.

Every platform re-compresses what you upload, so the goal is to hand it a clean, right-sized file that survives that second pass with the most detail intact. Use the one-click presets — YouTube, YouTube Shorts, Instagram, TikTok, Facebook, X (Twitter), LinkedIn, WhatsApp, Telegram, Discord, Email, Website, LMS and General Sharing — and the tool applies the recommended resolution, codec, frame rate and audio for that destination automatically.

Presets with hard caps (WhatsApp, email, Discord) also request a target size, so the encoder hits the limit when your clip’s length is known. The Social Media Limits table below shows each platform’s cap and the recommended output.

Platform	Upload limit	Recommended output
WhatsApp	16 MB (status), 2 GB (chat)	480–720p H.264, ~16 MB
Email (Gmail)	25 MB	360–480p H.264, ~10 MB
Discord (free)	25 MB	720p H.264, ~25 MB
Telegram	2 GB	720p H.264
X / Twitter	512 MB / 2:20	720p H.264
Instagram	~650 MB / 60 min	1080p H.264, CRF 23
TikTok	~287.6 MB (mobile)	1080p H.264, CRF 24
YouTube	256 GB / 12 hrs	1080p H.264, CRF 21
LinkedIn	5 GB / 10 min	1080p H.264, CRF 23

Compress Videos Without Losing Quality

The fear with any compressor is a blocky, smeared result. The trick is CRF (Constant Rate Factor) encoding: instead of forcing a fixed bitrate, the encoder targets a constant perceived quality and spends only as many bits as each scene needs. A CRF around 23–26 typically halves a file with no obvious loss; lower values stay closer to the original.

For footage that is already efficiently encoded, the Lossless Optimize mode rewraps the existing streams into an optimised container and adds web fast-start — shrinking overhead with zero re-encoding and therefore zero quality loss. And because this compressor never adds a watermark, your output looks exactly like the source, just smaller.

Supported Video Formats

You can compress every common video container and output to the format that fits your destination. Input formats include MP4, MOV, AVI, MKV, WEBM, FLV, WMV, M4V, MPEG/MPG, 3GP, OGV, TS, MTS, M2TS, VOB, ASF, F4V, DV and AVCHD. Output to MP4 (the universal default), MKV, WEBM (VP9 + Opus) or MOV, or keep the source container where possible.

MP4 with H.264 is recommended for the widest compatibility — it plays on virtually every device, browser, player and social platform.

MP4MOVAVIMKVWEBMFLVWMVM4VMPEGMPG3GPOGVTSMTSM2TSVOBASFF4VDVAVCHD

Video Compression FAQ

Answers to the most common questions about compressing video online. Still stuck? The Best Settings, Social Media Limits and Troubleshooting tables on this page cover specific cases in more detail.

Your files stay private

Files processed securely

Your video is read straight from disk into the browser and compressed there with WebAssembly FFmpeg — it never travels to a server.

Automatic deletion

Files live only in your tab’s memory and are released the moment you close or refresh the page. No permanent storage, ever.

Browser processing

Real encoding happens on your own device using your CPU, so there is no upload wait and no queue behind other users.

HTTPS secure

The page is served over encrypted HTTPS and is GDPR-friendly by design, because no footage or personal data leaves your device.

Frequently asked questions

Drag your video onto the upload box (or click to browse, paste or upload a folder), choose a compression mode or a target file size, then press Compress. The tool re-encodes the video locally with FFmpeg and gives you a download link when it finishes. It is completely free, with no sign-up, no watermark and no daily limit.

Free forever, private by design. Every compression runs on your own device with real FFmpeg — no upload, no watermark, no sign-up and no daily limit. Close the tab and nothing remains.

How to compress a video in 6 steps

Upload your video

Drag and drop your video onto the box, click to browse, paste a file, upload a whole folder, or import from a URL. The tool instantly reads the resolution, duration, codec, frame rate and bitrate.

Choose a compression method

Pick a compression mode — Automatic, Smart, Fast, Balanced, High Quality, Maximum, Lossless or Custom — or apply a one-click preset for WhatsApp, YouTube, Instagram, email and more.

Adjust the settings

Compress

Press Compress. FFmpeg re-encodes the video locally with a live progress bar, ETA and processing status — single files or a whole batch queue at once.

Preview the results

Compare before and after side by side, with the original size, compressed size, reduction percentage, compression ratio and estimated quality.

Download

Download each compressed video, grab the whole batch as a ZIP, or compress again with different settings. Nothing is stored once you leave the page.

What Is a Video Compressor?

How Video Compression Works

Bitrate

Codec

Modern codecs like H.265 (HEVC) and AV1 pack the same quality into roughly half the bits of older H.264 or MPEG-4. Switching codec is a free size win on capable devices.

Resolution

Scaling a 4K clip to 1080p, or 1080p to 720p, removes pixels you may not need on a phone screen and shrinks the file dramatically — often the fastest route to a big size cut.

Frame rate & audio

Codec	Efficiency	Speed	Compatibility	Best for
H.264 / AVC	Baseline	Fastest	Universal — every device & browser	Safe default, sharing, compatibility
H.265 / HEVC	~40–50% smaller	Slower	Most modern devices	Big size cuts at the same quality
AV1	~50% smaller	Slowest	Newer browsers & devices	Maximum efficiency for the web
VP9	~30–40% smaller	Slower	Chrome, Firefox, Android, WebM	Royalty-free open-web delivery
MPEG-4	Least efficient	Very fast	Legacy hardware	Old players & devices only

Why Reduce Video File Size?

Smaller videos are easier to share, faster to move and cheaper to keep. Reducing video file size helps in almost every workflow:

Save storage

Compressed videos take far less room on your phone, laptop, SD card or cloud drive — fit more clips in the same space.

Faster uploads & downloads

Fit attachment & chat limits

Squeeze a clip under Gmail’s 25 MB, WhatsApp’s 16 MB or Discord’s 25 MB cap so it actually sends instead of being rejected.

Better website performance

Lighter videos improve Core Web Vitals, reduce bandwidth bills and keep pages fast for everyone who visits.

4K phone clip · 1 min

~350 MB→ ~45 MB

~87% smaller

1080p screen recording · 5 min

~600 MB→ ~70 MB

~88% smaller

1080p drone footage · 2 min

~480 MB→ ~80 MB

~83% smaller

GoPro 1080p60 · 3 min

~700 MB→ ~95 MB

~86% smaller

Old AVI movie · 90 min

~1.4 GB→ ~480 MB

~66% smaller

720p webcam · 10 min

~900 MB→ ~120 MB

~87% smaller

Best Compression Settings

Use case	Resolution	Codec	Quality	Notes
Email attachment	360–480p	H.264	Target 10 MB	Fits under Gmail/Outlook limits with audio at 64–96 kbps.
WhatsApp / Telegram	480–720p	H.264	Target 16 MB	Lands under the 16 MB send cap; stays sharp on phones.
Discord (free)	720p	H.264	Target 25 MB	Matches the free 25 MB upload limit.
YouTube	1080p	H.264	CRF 21 (High)	High quality for re-encoding; YouTube compresses again on upload.
TikTok / Reels / Shorts	1080p vertical	H.264	CRF 22–24	Light compression keeps detail through the platform’s own pass.
Website / streaming	720–1080p	H.264 / H.265	CRF 24–26 + fast-start	Fast-start lets playback begin before the file finishes loading.
Long-term storage	Original	H.265 / AV1	CRF 26–30 (Maximum)	Most efficient codecs give the biggest archival space savings.

Platform	Upload limit	Recommended output
WhatsApp	16 MB (status), 2 GB (chat)	480–720p H.264, ~16 MB
Email (Gmail)	25 MB	360–480p H.264, ~10 MB
Discord (free)	25 MB	720p H.264, ~25 MB
Telegram	2 GB	720p H.264
X / Twitter	512 MB / 2:20	720p H.264
Instagram	~650 MB / 60 min	1080p H.264, CRF 23
TikTok	~287.6 MB (mobile)	1080p H.264, CRF 24
YouTube	256 GB / 12 hrs	1080p H.264, CRF 21
LinkedIn	5 GB / 10 min	1080p H.264, CRF 23

Compress Videos Without Losing Quality

Supported Video Formats

MP4 with H.264 is recommended for the widest compatibility — it plays on virtually every device, browser, player and social platform.

MP4MOVAVIMKVWEBMFLVWMVM4VMPEGMPG3GPOGVTSMTSM2TSVOBASFF4VDVAVCHD

Video Compression FAQ

Answers to the most common questions about compressing video online. Still stuck? The Best Settings, Social Media Limits and Troubleshooting tables on this page cover specific cases in more detail.

Your files stay private

Files processed securely

Your video is read straight from disk into the browser and compressed there with WebAssembly FFmpeg — it never travels to a server.

Automatic deletion

Files live only in your tab’s memory and are released the moment you close or refresh the page. No permanent storage, ever.

Browser processing

Real encoding happens on your own device using your CPU, so there is no upload wait and no queue behind other users.

HTTPS secure

The page is served over encrypted HTTPS and is GDPR-friendly by design, because no footage or personal data leaves your device.

Frequently asked questions

Free forever, private by design. Every compression runs on your own device with real FFmpeg — no upload, no watermark, no sign-up and no daily limit. Close the tab and nothing remains.

Video Compressor

Drag & drop your video to compress

How to compress a video in 6 steps

Upload your video

Choose a compression method

Adjust the settings

Compress

Preview the results

Download

What Is a Video Compressor?

How Video Compression Works

Why Reduce Video File Size?

Best Compression Settings

Compress Videos for Social Media

Compress Videos Without Losing Quality

Supported Video Formats

Video Compression FAQ

Your files stay private

Files processed securely

Automatic deletion

Browser processing

HTTPS secure

Frequently asked questions

Video Compressor

Drag & drop your video to compress

How to compress a video in 6 steps

Upload your video

Choose a compression method

Adjust the settings

Compress

Preview the results

Download

What Is a Video Compressor?

How Video Compression Works

Why Reduce Video File Size?

Best Compression Settings

Compress Videos for Social Media

Compress Videos Without Losing Quality

Supported Video Formats

Video Compression FAQ

Your files stay private

Files processed securely

Automatic deletion

Browser processing

HTTPS secure

Frequently asked questions