Text Diff Checker
Compare two blocks of text at line, word or character level, with an ignore-whitespace option.
Processed locally in your browser. Your text is never uploaded.
- Line, word or character-level highlighting — a single changed word highlights just that word, not the whole surrounding line.
- An ignore-whitespace option so trailing spaces, tabs-vs-spaces or blank-line differences don't clutter a comparison that's really about the content.
- No account and no upload — paste both versions and compare.
- Good for contracts, configuration files and prose where you need to see every change.
Why this is private
- Processed locally in your browser. Your text is never uploaded.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Compares two blocks of text and highlights additions and deletions at line, word or character granularity — useful for reviewing edits or comparing config versions.
How to use it
- 1Paste the original text on the left.
- 2Paste the changed text on the right.
- 3Choose line, word or character-level highlighting depending on how granular you need the diff to be.
- 4Turn on "Ignore whitespace" if spacing differences (trailing spaces, tabs vs. spaces) shouldn't count as changes.
Frequently asked questions
What people use it for
Spot changes between two config file versionsSee which lines were edited before deploying, or switch to word-level to see exactly which value changed within a line.
Review edits to a contract or policyConfirm exactly what wording changed between drafts, down to the specific word or phrase.
Compare two copies of a code snippetFind the line — or the exact character — that differs when two versions behave differently.
Check an AI rewrite against your originalSwitch to word-level diffing to see precisely what a rewrite altered, not just which lines changed.
Related tools
All text toolsRemove Duplicate LinesRemove duplicate lines from a list of text.JSON DiffCompare two JSON documents and highlight the differences.Word CounterCount words, characters, sentences and reading time instantly, with a readability score and writing goal tracking.Character CounterCount characters with and without spaces, live.
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Text Diff Checker