Text Diff Checker
Text diff checker — compare two versions of any text and see exactly what changed, line by line. Free tool for reviewing contract edits, copy changes, or code.
The Text Diff Checker compares two blocks of text and shows exactly what changed between them. Additions are highlighted in green, deletions in red, and unchanged lines are shown in gray. It is the same kind of diff view you see in code review tools, applied to any text.
Paste your original version on the left and the updated version on the right. The diff is calculated line by line and shown inline so you can scan changes quickly. This is useful for comparing contract drafts, reviewing edited copy, spotting unauthorized changes to a document, or diffing configuration files.
You can switch between side-by-side and unified diff views depending on what makes the changes easier to read for your use case.
Frequently Asked Questions
- Does it compare character by character or line by line?
The diff is calculated line by line by default. Changed lines are highlighted, and within those lines, the specific changed words or characters are further highlighted for precision.
- Can I diff code as well as regular text?
Yes. The tool handles any text content including code, JSON, HTML, and prose. It does not do syntax highlighting, but the diff itself works correctly on any text.
- Is there a size limit on the text I can compare?
Large texts work fine, though comparing very long documents may be slightly slow on older devices. There is no hard character limit.
- Is there a free text diff checker online?
Yes. This text diff tool is completely free. Paste two versions of any text into the two panels and click compare to see additions, deletions, and unchanged lines highlighted. No account or server upload required.
- What is a text diff and when is it useful?
A text diff is a comparison between two versions of the same text that highlights what changed between them. It is useful when reviewing contract revisions, comparing two versions of a document, checking copy edits, or seeing what changed in exported data between two exports.
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