Any two pieces of text: drafts, contracts, code, config, translations — anything you can paste.

What do the colors mean?

Green lines were added in the changed version, red lines were removed from the original, and grey lines are unchanged.

Can it handle large texts?

Yes. Very large inputs are simplified where needed so the comparison stays fast and won't freeze your browser.

Does it compare word by word?

The diff works line by line, which is clear and reliable for most documents. Add line breaks to compare smaller chunks.

No. Both texts are compared entirely in your browser. Nothing is sent to a server and there is no sign-up.

Text Diff Checker

Original text

Changed text

+ 2 added− 1 removed

Differences

  The quick brown fox
− jumps over
+ leaps over
  the lazy dog
+ and runs away

Related external tools

Some links are affiliate links.

JetBrainsA developer tooling company behind popular IDEs like IntelliJ IDEA, WebStorm, PyCharm, and Rider. Known for deep code intelligence, refactoring support, and built-in debugging tools. Offers an All Products Pack subscription for access to the full suite.AmazonThe world's largest online marketplace for shopping, electronics, books, software, and more. Fast shipping, easy returns, and a vast product catalog make it a go-to for everyday purchases. Prime membership adds streaming, free shipping, and exclusive deals.

Compare two versions of any text and see exactly what changed. Paste an original and a revised version to get a clear, line-by-line view with additions in green and removals in red, plus a count of the changes. Perfect for proofreading, reviewing edits or checking contract revisions. Everything runs in your browser — nothing is uploaded.

How to use

Paste the original text on the left.
Paste the changed text on the right.
Review the highlighted additions and removals, and the change counts.

How the diff works

The checker compares the two texts line by line and finds the longest sequence of lines they share. Lines only in the original are marked as removed, lines only in the new version are marked as added, and matching lines are kept unchanged. This gives a clean view of exactly what was edited.

Features

Line-by-line highlights

Additions and removals are color-coded so changes jump out at a glance.

Change counts

See how many lines were added and removed in total.

Keeps unchanged lines

Shared lines stay in place for context, so you can read the result in order.

Handles large texts

Big inputs are processed without freezing your browser.

Private by design

Both texts are compared locally. Nothing is uploaded to a server.

Common use cases

Proofreading & editing

Spot every change between two drafts of an article or email.

Contracts & policies

Check exactly what changed in a revised agreement or terms.

Code & config

Compare two snippets or config files to see the edits.

Translations & versions

Track differences between versions of a document or translation.

Notes & tips

The comparison works on whole lines, so split your text with line breaks where it matters.
Very large differences are simplified so the tool stays fast.
Identical texts show no additions or removals.
Everything runs on your device — nothing is sent to a server.

Frequently asked questions

What can I compare?: Any two pieces of text: drafts, contracts, code, config, translations — anything you can paste.
What do the colors mean?: Green lines were added in the changed version, red lines were removed from the original, and grey lines are unchanged.
Can it handle large texts?: Yes. Very large inputs are simplified where needed so the comparison stays fast and won't freeze your browser.
Does it compare word by word?: The diff works line by line, which is clear and reliable for most documents. Add line breaks to compare smaller chunks.
Is my text uploaded?: No. Both texts are compared entirely in your browser. Nothing is sent to a server and there is no sign-up.