Free Text Diff Checker — Compare Two Texts Online

Paste two versions of a text side by side and see exactly what changed — added, removed, and edited words are highlighted line by line. Perfect for proofreading revisions, reviewing contract changes, or checking code edits. Everything runs in your browser; nothing you paste is uploaded anywhere.

How it works

Everyday uses

Proofread revisions. Paste the old draft and the new draft of an essay, report, or article. Every edit lights up instantly — no more squinting at two tabs.

Review contracts and terms. When a vendor sends “updated terms,” compare the old version with the new one to catch quietly added clauses before you sign.

Check code changes. Paste two versions of a snippet to spot exactly which lines changed — handy when a teammate says “I only changed one thing.”

Spot plagiarism or edits. Teachers and editors compare submissions against originals; the word-level highlighting shows paraphrasing, not just whole-line changes.

Sync translations. Translators compare source and revised paragraphs to confirm every edit was carried over consistently.

This is the same idea behind “track changes” in Word and the red/green diffs on GitHub — just without any software to install. Learn the technique properly in our guide: How to Compare Two Texts and Find Differences Online.