OpenKOD Diff Checker Compare text privately — nothing leaves your browser unless you save it

Keyboard shortcuts

CtrlEnter
Compare
n
Jump to next change
p
Jump to previous change
↑↓
Step between changed lines
Enter
Merge the change you’re on
Esc
Close the open merge card or this panel

In Split view, click a changed line to merge it — or press n, then Enter.

Diff Checker for desktop

The same tool, reading your folders straight from the disk instead of through the browser. Measured 14× faster on a folder of 1,500 files — 3.0 seconds in the browser, 0.2 seconds on the desktop.

Coming soon

It isn’t finished yet. Tell me you want it and I’ll build it faster — and let you know the day it’s ready.

One email when it launches. Nothing else, ever.

Keep your comparisons

Sign in to save comparisons and open them again later, on any device.

Continue with Google

Google tells us your name and email address, nothing else. How accounts work

Saved comparisons

Signed in as

Compare text online — free, private, no sign-up

Paste two versions below and the differences highlight instantly. Merge them line by line, or compare two whole folders. Everything runs inside your browser — your text is never uploaded unless you choose to save it.

Original text
Changed text
or press Ctrl + Enter

How it works

  1. Paste or drop a file into each box — text, code, PDF or Word — or open a folder tab and pick a folder on each side.
  2. Differences highlight as you type: removed on the left, added on the right.
  3. Click any changed line to take that version, then copy or export the merged result.

Is my text uploaded anywhere?

No. The comparison runs inside your browser using JavaScript, and your text stays on your device. It reaches our server only if you choose to sign in and save a comparison — accounts are optional, and nothing else on the site can receive your text. There is no tracking script. We count page visits on the server — the date, the page, the country and the site that linked here — but nothing runs in your browser to do it, no cookies are set for it, and your text is never part of it.

You can check this yourself: open your browser's network tab, compare something, and watch that nothing is sent.

Can I compare two folders?

Yes. Open a folder comparison tab, choose a folder on each side, and you get two matching file trees. You can merge a single file, or tick a folder to replace everything inside it at once, then export either side as a .zip with your merges applied.

What can I compare?

Plain text, code, JSON, CSV, logs, config files, Markdown, PDF and Word documents — anything you can paste or drop in. Syntax highlighting covers the common languages, and you can tell it to ignore whitespace, letter case, blank lines, or your own patterns such as timestamps and build numbers.

Can I compare PDF or Word files?

Yes. Drop a PDF or a Word file (.docx) into either box, or use Upload. Its text is read inside your browser — the file is not uploaded — and compared like any other text. Formatting and pictures are not compared, and a scanned PDF is a picture of the pages, so it has no text to compare. Older .doc files need saving as .docx first.

Does it work offline?

Yes. After your first visit the tool is cached on your device, so it opens and works with no internet connection.

Is it free?

Yes, completely free — no sign-up needed, and no limits on how much text you compare. See the privacy note and terms.