Text Diff Checker
Compare two texts and instantly see every addition, deletion, and change highlighted in color. Free, private, browser-only — no uploads, no account needed.
Updated April 2026
Paste text in both panels above to compare
Supports plain text, code, contracts, or any document
How to use the diff checker
Paste two versions, see every difference highlighted
1. Paste the original text
Left panel — source code, a contract, an essay, or any plain text.
2. Paste the updated version
Right panel — differences are highlighted automatically as you type.
3. Step through the changes
`Alt+↓`/`Alt+↑` jump between change groups; `Shift+Enter` copies the diff.
What this text compare tool does
The Myers diff algorithm — the same one Git uses
Three comparison modes
Word, line, or character level, depending on the kind of content you're checking.
Split or unified view
Side-by-side for prose and contracts, or a linear diff with +/- just like git diff.
Clear color coding
Green for additions, red for deletions, neutral for unchanged text.
100% in your browser
Nothing is uploaded to a server — safe for proprietary source code and confidential contracts.
Which comparison mode to use
When you'll reach for this
The most common scenarios among people who use this tool
Code review
Compare two versions of a function or config file before merging a pull request.
Contract comparison
Catch unauthorized edits between drafts — faster and more reliable than reading line by line.
Editorial workflow
See exactly which words an editor changed, without relying on track changes.
Translation QA
Source on the left, translation on the right, to spot missing sections or drift from the original.
Common mistake? Start here
Using the wrong mode for the content
Line diff on prose flags the entire line for a one-word edit — switch to word diff instead.
Expecting broad plagiarism detection
This tool only compares the two texts you provide — it doesn't search the web or academic databases.
Skipping the keyboard shortcuts
On long diffs, Alt+↓/Alt+↑ are much faster than scrolling manually to the next change.
Why use this diff checker
It runs the Myers diff algorithm — the same one behind Git — to detect additions, deletions, and modifications precisely, not a simplified heuristic that misses edge cases.
It runs entirely in your browser: safe for proprietary source code, contracts, and confidential business text, since nothing ever leaves your device.
Split view vs. unified view
Two ways to read the same diff
Frequently asked questions
A diff checker compares two versions of a text and shows every difference in a color-coded view — additions, deletions, and changes clearly marked. Use it any time you need to answer "what actually changed?" between two versions of a document, a contract, or a block of code.
References
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