No install
Desktop power, in a tab
Folder comparison usually needs a desktop app. Here it runs in your browser — on Windows, Mac, Linux or ChromeOS.
Folder Diff Checker · No Install
Compare folders without a desktop app.
Drop two folders or .zip files. See what was added, removed or modified — and open any file's line-by-line diff. All in your browser.
Original folder
Drop a folder or .zip here
Changed folder
Drop a folder or .zip here
Names or patterns like *.log, comma-separated. Applied when loading.
Results appear here.
Load two folders or .zip files to compare
See which files were added, removed or modified — then open any file to see its line-by-line diff. Nothing is uploaded.
How It Works
Three steps. No sign-up.
- 1
Drop a folder or a .zip on each side — or use Choose Folder / Choose .zip. Junk like node_modules and .git is skipped.
- 2
Press Compare Folders. Files are matched by path and compared byte by byte, right in your browser.
- 3
See every added, removed and modified file. Open any file for a line-by-line diff with syntax highlighting.
Features
Built for real-world data.
Zip
Compare .zip archives
Compare two releases, exports or backups straight from their .zip files — or a zip against a folder.
Drill down
Open any file’s diff
Click a modified file to see its line-by-line changes with syntax highlighting and moved-code detection.
Fast
Byte-exact & quick
Files with different sizes are flagged instantly; same-size files are compared byte by byte. Thousands of files in seconds.
Filter
Ignore the noise
Skip node_modules, .git, build output or *.log with simple patterns. Filter results by status or path.
Private
Nothing is uploaded
Source code and documents never leave your device. Works offline once the app is installed.
FAQ
Questions & answers
Can I compare folders without installing anything?
Yes. Drop two folders (or click Choose Folder) in Chrome, Edge, Firefox or Safari on desktop. Everything runs in the browser tab.
Can I compare two zip files?
Yes. Choose or drop a .zip on each side. A zip can also be compared against a regular folder.
How are files compared?
Files are matched by their relative path. Different sizes mean modified; files with the same size are compared byte by byte, so the result is exact.
Does it work on phones?
Mobile browsers can’t pick whole folders, but you can compare two .zip files on any phone or tablet.
Is there a limit?
Up to 50,000 files per side. Because nothing is uploaded, very large folders depend on your device’s memory.
Are my files uploaded?
No. Files are read locally by your browser and never sent anywhere.
More Compare Tools
Free, private, in your browser.
Text & Code Compare
Side-by-side diff with syntax highlighting and moved-code detection.
JSON Compare
Semantic diff that ignores key order, with exact paths and JSON Patch.
Excel & CSV Compare
XLSX, XLS, ODS and CSV — row and cell differences, matched by ID.
Word, PDF & PowerPoint Compare
DOCX, DOC, PDF, PPTX, ODT and more — even across formats.
Image Compare
Slider, fade, blink, pixel difference and highlighted regions.
Compare Lists
What’s only in A, only in B, and in both — instantly.
Three-Way Merge
Merge two edited versions of a file against their common base, resolving conflicts.