What is a text diff tool?

A text diff tool compares two versions of a text document and shows exactly what changed between them. It marks additions in one colour and deletions in another so changes are easy to read at a glance.

Can I use this as a document revision tracker?

Yes. Paste an older version of a document on the left and a newer version on the right to see all revisions highlighted.

Is this the same as using "Track Changes" in Word?

Similar concept, but browser-based and language/format agnostic. FixTools Diff Checker works with any plain text — not just Word documents.

Can I diff long documents?

Yes. The tool handles long documents well. Scroll through the diff to review changes across sections.

Is the tool free for commercial use?

Yes. FixTools is free to use for personal and commercial purposes with no restrictions.

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Text Diff Tool — Find Changes Between Two Documents

A fast, clean text diff tool for writers, developers, and editors alike. Paste any two versions of a document and instantly see what changed, what was added, and what was removed — with no clutter, no ads, and no account.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Instant diff with colour-coded highlights

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Works for documents, code, and data

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Clean interface with no distractions

Developer Tool

Diff Checker

All processing happens in your browser — your files are never uploaded to any server.

🚀Open Diff Checker

100% Free · No account · Works on any device

How to use this tool

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Enter your original text and revised text in the two panels, then click Compare to generate a full diff report.

How It Works

Step-by-step guide to text diff tool — find changes between two documents:

1
Open Text Diff Tool
Click "Open Diff Checker" to launch the text comparison tool.
2
Enter the original version
Paste or type your original text into the left panel.
3
Enter the revised version
Paste your updated text into the right panel.
4
Run the diff
Click Compare. The tool highlights all differences inline — green for added content, red for removed content.