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Text Diff & Compare Tool
Text Diff & Compare Tool lines up two versions of a text side by side and highlights exactly which lines were added, removed or left unchanged, with a running count so you can see the scale of the change.
How to use Text Diff & Compare Tool
- Paste the original text into the left panel.
- Paste the revised text into the right panel.
- Compare to see added and removed lines highlighted and counted.
Where Text Diff & Compare Tool is useful
- Checking what changed between two drafts of a document.
- Reviewing edits in a contract or policy revision.
- Comparing two configuration or code files by eye.
- Confirming that a rewrite really is different from the source.
Formats, algorithms and limits
Comparison works line by line, which is the right granularity for prose paragraphs, code and lists: an added line, a removed line and an unchanged line are each marked clearly. Reordering whole paragraphs shows as a removal plus an addition rather than a move, and whitespace differences are kept visible on purpose.
Troubleshooting and honest limits
- Paste plain text. If you paste from a document editor, trailing spaces may show as changes.
- For prose, put one paragraph on one line so each paragraph reads as a single change.
- Use the counts as a size check: a large added figure on a rewrite you expected to be minor is worth a second look.
Frequently asked questions
Does the comparison ignore upper and lower case?
No. Differences in case are real differences in the text and are shown as changed lines.
Can it compare whole files?
Paste the content of both files. Plain text, CSV and source code compare well; binary formats do not.
Is there a length limit?
Only your browser's memory. Documents of thousands of lines compare quickly.
Is the text stored anywhere?
No. Both versions stay in the browser and the comparison is computed locally.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Text Diff & Compare Tool runs entirely in your browser — no uploads, no account and no daily limits.