Compare text and find differences
Paste two versions of a text, contract or code and see exactly what was added, removed or changed — side by side or inline.
- Files never uploaded
- Free, no sign-up
- Works on any device
- Works offline
How to use the diff checker
Paste both versions
Put the original on the left and the changed version on the right.
Compare
Changes are highlighted instantly — green for added, red for removed.
Switch views
Choose side-by-side or inline, and ignore whitespace if you like.
About Diff checker
Why use a private diff tool?
Many online diff sites save what you paste. Contracts, configuration files and code often contain secrets. Here the comparison runs in your browser and nothing is stored.
Your files never leave your device
Most online PDF sites upload your documents to their servers. DocuVault doesn’t. Everything happens inside your browser, so there is nothing for anyone to see, store or leak.
Check it yourself
Use a tool once, then turn off your Wi-Fi or switch to airplane mode and use it again — it still works. Developers can watch the Network tab: no file is ever sent.
Step 1
You choose a file
Your browser opens it directly from your device — like opening it in an app.
Step 2
Your device does the work
The processing code runs inside this browser tab. No server ever receives your file.
Step 3
You save the result
The new file goes straight to your downloads. Close the tab and everything is gone.
Frequently asked questions
Is my text saved anywhere?
No. Nothing is sent or stored. Closing the tab clears it.
Can I compare files?
Yes. Drop a text file onto either side.