Text Difference Checker – Check Text Online (Free Tool)
Free online Text Difference Checker tool to compare two texts and find differences. Highlight added, removed, and changed text with visual diff. Perfect for proofreading, version comparison, and content review.
Example Output
Word-level diff highlights changes within otherwise-identical lines.
Diff: -quick +slow (1 word changed)
What is Text Difference Checker?
Text Difference Checker compares two pieces of text and highlights what changed — added lines, removed lines, and modified content. Useful for proofreading revisions, checking AI-edited copy, comparing translations, and reviewing config drift between environments.
Why use this tool?
- Your data stays private — all processing happens locally in the browser
- No telemetry, no tracking pixels, no third-party scripts
- Open-and-go: bookmark the page once and never look for an alternative
- No character or word-count cap on the input
- Handles Unicode correctly — emoji, CJK, Arabic, and accented Latin all stay intact
How to use
- Paste your "before" text in the left pane
- Paste the "after" text in the right pane
- Click Compare — additions/removals/changes are highlighted line-by-line
- Toggle word-level vs line-level diff depending on the granularity you need
Examples
Proofread a revision
Paste original draft + edited version. The tool surfaces every change so you can review them deliberately rather than re-reading the whole document.
AI-assisted edit review
When asking AI to "tighten this paragraph", paste the original and the rewrite side by side to verify nothing important was dropped.
Common use cases
- Proofreading multiple revisions of a document
- Reviewing AI-edited or rewritten text
- Comparing translations against the source
- Spotting drift between two config files or specs
Troubleshooting
- Whitespace differences flood the diff.
- Trailing spaces and different line endings appear as changes. Pre-process both inputs through Remove Extra Spaces if you only care about content.
Frequently Asked Questions
The tool compares two texts character by character or word by word, highlighting additions, deletions, and modifications between them.
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