Free Diff Checker — Compare Text Online, No Upload
Compare two texts or files side by side and see every added, removed, and changed word. Everything runs in your browser. Share links hold the diff itself, so they never expire and nothing is stored on a server.
Diffly · by ToolBookly
🔒 No upload · Texts never leave your device · Share links never expire · 100% in your browser.
How to compare text with Diffly
Original on the left, changed on the right, or open and drop local files. Nothing is uploaded.
See added, removed, and changed lines, with changed words highlighted.
Switch between side by side and unified, ignore whitespace or case, or show only changes.
Copy a share link that never expires, or download a standard .diff patch.
Compare text privately, with links that never expire
Most online diff checkers send your text to their server, and their saved links expire or sit in someone else’s database. Diffly computes the diff in your browser. When you share, both texts are compressed into the link itself, after the #, which browsers never send to a server. Anyone with the link sees the same diff, for as long as the link exists.
What you can do
- Side-by-side or unified view with line numbers
- Word-level highlights inside changed lines
- Ignore whitespace or case; hide unchanged lines
- Open local files, copy or download a standard unified .diff patch
Why Diffly?
- 🚫 No upload: contracts, code, and drafts stay on your device
- ♾️ Share links never expire because the diff lives in the link, not on a server
- 🆓 Free forever, no signup, no ads in the way, no size paywall
All ToolBookly tools · Wordify · CaseShift · Hashly · QRly · PDFly