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Switch to Deep or AI mode to compare by content checksum and detect duplicates and renames.
A complete, private, in-browser tool to compare folders, find duplicates, verify backups and analyse differences — with real content checksums, a visual tree and line-level diffs.
Find missing, extra, modified, renamed, moved and duplicate files plus folder-structure differences between two folders.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes with Web Crypto to detect exact matches and verify integrity byte-for-byte.
Group identical files by content hash across both folders, with duplicate locations and the disk space you would save.
A side-by-side, expandable folder tree highlights every difference, with search and filters by type, status and path.
For changed text and source-code files, view a line-by-line diff with syntax-aware highlighting, ignoring whitespace or case.
Compare image dimensions and media metadata, and detect identical media by content hash.
Save a folder snapshot and compare a folder against it later to track changes over time.
Scanning, hashing and comparison all run in your browser. Your folders are never uploaded.
A folder comparison tool compares the contents of two folders and shows exactly how they differ — which files are missing, which are extra, which have been modified, which are duplicates, and which have been renamed or moved. It is the fastest way to verify a backup, validate a migration, check whether two copies are in sync, or find wasted space from duplicate files.
This tool runs entirely in your browser. It reads each folder’s directory tree (or a ZIP archive), builds a file index, and compares by name, size, date and — in deep mode — by content checksum using Web Crypto. Because nothing is uploaded, even sensitive folders stay private, and the comparison starts instantly.
Copies drift apart. A backup misses a file, a sync silently fails, a migration drops a folder, or duplicates pile up and waste space. Comparing folders catches these problems before they cause data loss, and confirms when two copies really are identical.
From verifying backups and validating cloud or NAS migrations to auditing website deployments, cleaning media libraries and reviewing project changes, folder comparison gives you a precise, trustworthy answer about what changed — and what to do about it.
Different jobs need different depth. The tool offers four methods, from instant name checks to byte-exact content verification.
When you add a folder, the engine reads its directory tree via the browser’s directory-upload API (or unpacks a ZIP with JSZip), strips the root folder name, and builds an index keyed by each file’s relative path. It records size, modified date, type and category for every file.
In deep and AI modes it computes a content hash for each file with the Web Crypto API (SHA-1/256/512) or a built-in MD5. It then matches files by path: same path and same content is matching; same path, different content is modified; a file present on only one side is missing; and identical content at different paths is detected as renamed or moved. Files with the same hash are grouped as duplicates. Everything runs on your device.
Drop a folder (or a ZIP) into the first slot. The whole directory tree is read privately in your browser — nothing is uploaded — and instantly analysed for files, folders and total size.
Add the second folder or ZIP to compare against. You can compare folder vs folder, folder vs ZIP, or ZIP vs ZIP, or load a saved snapshot as the second side.
Pick Quick (names), Standard (names, sizes and dates), Deep (content checksums) or AI (deep plus rename, move and duplicate detection). Choose the hash algorithm if comparing content.
See matching, modified, missing, renamed and duplicate files in a side-by-side folder tree with highlighting, filters and search, plus folder health scores and a difference summary.
Download a summary or detailed report as PDF, CSV, Excel, JSON or XML, view sync suggestions, save a snapshot, or share the result.
| Method | Compares | Speed | Best for |
|---|---|---|---|
| Quick (name) | Relative paths only | Instant | A fast first look at structure differences |
| Standard (metadata) | Path + size + modified date | Very fast | Everyday sync checks without reading content |
| Deep (content) | Path + content checksum | Depends on size | Backup and integrity verification |
| AI (smart) | Deep + rename/move + duplicates | Depends on size | Migrations and clean-ups |
| Snapshot | Folder vs saved snapshot | Fast | Tracking changes over time |
Compare a folder against its backup to confirm every file copied correctly, byte-for-byte, before you rely on it.
Download two copies and compare to confirm a cloud sync or migration kept everything in sync.
Verify that two NAS shares or drive copies match, and spot files that silently failed to replicate.
Diff two project versions or build outputs to see exactly which files and lines changed.
Compare a local build against a deployed copy to catch missing or stale assets.
Find duplicate photos, music and video across folders and reclaim storage.
Audit folder structures for integrity, duplication and organisation across teams.
Prove a data migration completed with nothing missing, altered or duplicated.
Your folders never leave your device. Scanning, hashing and comparison all run in your browser.
Your folders are scanned, hashed and compared in your browser. They are never sent to a server.
File data and the comparison report live only in your browser tab and are released when you close it.
No sign-up, no email, no tracking of your file contents.
Because nothing is uploaded, there is nothing to delete — files vanish when you leave.
SHA-1, SHA-256 and SHA-512 checksums are computed natively in the browser; MD5 uses a built-in implementation.
The webkitdirectory API reads an entire folder tree locally, with each file’s relative path preserved.
ZIP archives are unpacked in the browser so you can compare folders against archives, or archive vs archive.
A Myers diff engine produces line-level differences for changed text and source-code files.
Use Deep mode with SHA-256 to confirm every file matches byte-for-byte, not just by name and size.
AI mode detects files that moved or were renamed by matching content hashes, so a reorganised folder is not flagged as all-missing.
Deep or AI mode groups identical files by content and shows the space you would reclaim by removing duplicates.
Drop a .zip into either slot to compare a live folder against an archived copy, or two archives against each other.
Save a snapshot of a folder today, then compare the same folder against that snapshot later to see what changed.
Quick and Standard modes scan instantly; Deep mode reads file content, so very large folders take longer — start with Standard.
Automate comparison at scale with a REST API: hash comparison, duplicate detection, integrity verification, snapshots, batch jobs, webhooks, API keys, team accounts and usage analytics.