Compare ZIP Files
Free ZIP diff with no upload. Compare two ZIP files without extracting them and see the added, removed, and changed entries at a glance.
Files never leave your browser.
About ZIP Diff
Compares the file trees of two ZIP archives. Reports added, removed, and changed entries with size and optional content comparison.
How to use
- Drop or pick the left ZIP archive.
- Drop or pick the right ZIP archive.
- Toggle Compare contents under Options to read file bytes; otherwise size and metadata only.
What this tool doesn't handle
- Encrypted ZIPs are not supported.
- Symlinks and Unix file modes are reported but not visualized.
Frequently asked questions
Do my files ever leave my browser?
No. Every comparison runs locally in your browser. Nothing you paste, drop, or load is uploaded to a server; the tool keeps working even if you go offline after the page loads.
Is this tool free to use?
Yes. All DiffResolver tools are free, with no account, sign-up, or installation. Because processing happens on your device, there are no server-imposed usage limits.
Can I see which files inside two ZIPs actually changed?
Yes. By default entries compare on size and metadata; enable Compare contents to check what is inside, flagging changed files even when their sizes match.
Are password-protected ZIP archives supported?
No. Encrypted archives cannot be read in the browser. Extract them locally first and compare the resulting folders with Folder Diff instead.
Is there a file size limit?
No server limit applies, because nothing is uploaded. The memory of your device sets the practical limit. Above 10 MB for text, 40 MB for images, 100 MB for documents, or 500 MB for archives, the tool warns you that the work can be slow, but it never blocks the file.
Does this tool work offline?
Yes. The browser keeps a copy of the tool after the first visit, so a page you opened before still works without a network. You can also install DiffResolver as an app from the browser menu. Installation stays optional; the site works the same in a normal tab.
Where is my data stored?
Your files are stored nowhere. They stay in the memory of the page and are gone when you close the tab. Only what you save yourself stays in this browser: a snapshot, your tool options, and your theme. To remove it, open Settings and select Clear all local data.