About the Text Diff Checker
When two versions of a document look almost identical, spotting what changed by eye is slow and unreliable. A diff checker compares two blocks of text and highlights exactly what was added, removed or changed between them, so you can review edits in seconds.
Paste an original and a revised version, and this tool shows the differences instantly in your browser. Nothing is uploaded, so it's safe for contracts, code and private documents.
How to use it
- 1Paste the original text into the first box.
- 2Paste the changed version into the second box.
- 3Run the comparison.
- 4Review the highlighted additions and deletions.
- 5Use the result to confirm or roll back changes.
Common uses
- →Checking what changed between two drafts of a document.
- →Reviewing edits someone made to your text.
- →Comparing two versions of a code snippet or config.
- →Verifying a copy-paste didn't drop or alter anything.
- →Spotting subtle differences in near-identical text.
Tips & good to know
- Compare like with like — paste plain text rather than mixing formatted and unformatted versions.
- For long documents, compare section by section to keep the diff readable.
- Additions and deletions are colour-coded so you can scan changes quickly.
Frequently asked questions
- Is my text sent anywhere?
- No. The comparison runs entirely in your browser, so even confidential documents stay private.
- Does it compare word by word or line by line?
- It highlights the differences between the two texts so you can clearly see what was added and removed.
- Can I compare code?
- Yes. It works with any plain text, including code snippets and configuration files.