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Text Difference Checker

The text difference checker compares two blocks of text line by line and highlights which lines were added, removed or left unchanged. It is a quick way to review an edit without opening a version-control tool.

Options
Original text 0 characters
Changed text 0 characters
Differences

Your result will appear here.

Not sure where to start? Use Load example.

Results update automatically and are calculated on your device. Nothing you type is sent to a server.

Runs in your browser. Processing happens entirely in your browser. Nothing you enter is sent to Delimiter.live.

How to use the Text Difference Checker

  1. Paste the original version into the first box.
  2. Paste the revised version into the second box.
  3. Review the highlighted result: green lines were added, red lines were removed, and unchanged lines are shown for context.
  4. Copy the unified diff if you want to share the change.

Example

Input
line one
line two
Output
  line one
- line two
+ line 2

Common use cases

  • Checking exactly what an editor changed in a draft.
  • Comparing two configuration files or environment variable lists.
  • Verifying that a copy-paste transfer did not lose any lines.
  • Reviewing a contract or policy revision before signing off.

Limitations and things to watch for

  • The comparison works at line level, not word level, so a small change inside a long line marks the whole line as changed.
  • Very large inputs (tens of thousands of lines on each side) will take a noticeable moment to compare, because the algorithm examines both versions in full.

Frequently asked questions

Are my documents uploaded for comparison?
No. Both versions stay in your browser and the comparison runs locally, which matters when you are diffing contracts, configuration or unpublished copy.
Does it show word-level changes inside a line?
Not currently. Differences are reported per line: a modified line appears as one removal plus one addition, which is the same convention command-line diff uses by default.
Can I ignore indentation differences?
Yes. Turn on "Ignore leading and trailing whitespace" so re-indented lines are not reported as changes.
Can I export the result?
Yes. The copy button puts a unified-style diff on your clipboard, using - and + prefixes that most reviewers will recognise.

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