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Text Diff Checker

Paste two versions of a text and see precisely what changed between them, highlighted line by line and word by word.

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Differences

About the text diff

Spotting the difference between two nearly identical documents by eye is a reliable way to miss something important. This diff checker aligns the two versions using the same longest-common-subsequence approach that developer diff tools use, marks added and removed lines, and highlights the changed words inside modified lines so small edits stand out. It works just as well on contract revisions and article drafts as on code. Nothing is uploaded, so confidential documents are safe to paste.

How to use the text diff

  1. Paste the original version into the left panel.
  2. Paste the revised version into the right panel.
  3. Review the highlighted result: green for additions, red for removals.
  4. Toggle whitespace or case sensitivity if formatting-only changes are creating noise.

Frequently asked questions

What do the colors mean?
Green marks content present only in the revised version (added), red marks content present only in the original (removed), and unchanged lines are shown plainly for context. Within a modified line, the specific changed words are highlighted more strongly.
Can I compare code with this?
Yes. The diff is plain-text and language-agnostic, so it handles source code fine. For a repository you are better served by `git diff`, which understands file history, but for two pasted snippets this is quicker.
Is my text sent to a server?
No. The comparison algorithm runs entirely in your browser, so you can safely diff contracts, medical documents or anything else confidential.

Other free tools people use alongside the Text Diff.

Text Converter Transform text between a dozen case formats and get live word, character and reading-time counts as you type. Text Markdown to HTML Write or paste Markdown on the left and get a live preview plus clean, copyable HTML on the right. Text Box Shadow Generator Dial in a box shadow and border radius with sliders, watch the preview update, and copy the CSS. Developer CSS Animation Generator Pick an animation, tune the timing, and copy complete CSS including the keyframes. Developer