Compare 7z Archives
Compare two 7z archives online, decompressed locally in your browser. Added, removed, and changed files, with optional content comparison. Nothing is uploaded.
Files never leave your browser.
About 7z Diff
Compares the file trees of two 7z archives, decompressing in-browser. Reports added, removed, and changed entries.
How to use
- Drop or pick the left .7z archive.
- Drop or pick the right .7z archive.
- Optionally compare entry contents.
What this tool doesn't handle
- Password-protected archives are not supported.
- The archive is fully decompressed on your device to compare contents, so very large archives need time and memory proportional to their unpacked size.
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.
How are 7z archives processed in the browser?
Entirely on your device. The archive is decompressed locally in the background, so even large or sensitive archives never leave your computer.
Why does a very large 7z file take a moment to load?
The whole archive is decompressed in the background so its file contents can be compared. The page stays responsive while that happens; very large archives simply need more time and memory.
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.