Text Diff Checker
Paste two versions of any text to see exactly what changed: inserted lines in green, deleted lines in red, and the changed words inside each edited line highlighted. Runs entirely in your browser.
Compared on your device. Your text is never uploaded.
How to Use Text Diff Checker Online
This text diff checker compares two versions of a document the moment you paste them, using the same Myers diff algorithm that powers Git. Inserted lines are highlighted in green and deleted lines in red, and when a line was edited rather than replaced, the exact words that changed are marked inside it, so you can spot a changed date or a missing comma at a glance. Switch between a side-by-side view and a compact unified view, ignore differences in case or whitespace, and fold long unchanged sections to focus on what matters. It works for contracts, essays, code, configuration files and CSV data. Both texts stay inside your browser tab: nothing is uploaded or stored, so it's safe for confidential drafts and private code.
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Paste the original text into the left box and the changed version into the right box.
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See additions, deletions and edited lines highlighted instantly, with changed words marked inside each line.
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Switch between side-by-side and unified views, or ignore case and whitespace differences.
Why use this Text Diff Checker
Word-level highlights
Edited lines show exactly which words changed, not just that the line differs.
Two views
Side by side for reading, unified for a compact, Git-style summary.
Smart options
Ignore case or whitespace, and fold unchanged sections automatically.
Private by design
Both texts stay in your browser and are never uploaded.
Popular uses for the Text Diff Checker
Compare contract versions
See exactly what changed between two drafts of an agreement.
Review code and config changes
Diff snippets, JSON and config files without Git.
Check edits to essays and articles
Spot every change an editor or co-author made.
Find differences in lists and data
Compare two lists of emails, IDs or CSV rows line by line.
Also known as: diff checker, text compare tool, compare two texts, difference finder, document comparison and online diff.
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Fast, private text tools in your browser
Count words, check reading time, compare drafts and extract text from images with free online text tools that run entirely on your device. Nothing you paste or drop is uploaded or stored, so they're safe for unpublished articles, contracts and anything confidential.
Frequently asked questions
How does the text diff checker find differences?
It compares the texts line by line with the Myers diff algorithm (the one Git uses) to find the smallest set of changes, then compares edited lines word by word to highlight exactly what changed.
Is it safe to compare confidential documents?
Yes. The comparison runs entirely in your browser. Neither text is uploaded, stored or logged, so contracts, private code and unpublished drafts stay on your device.