Text Diff Checker
Compare two text blocks and see exactly what changed — added, removed, and unchanged lines highlighted side by side. Copy the diff or download it.
Disclaimer: Free tool provided “as is” by MonitorGiant. No warranty or liability for any data loss, security issues, or infrastructure problems arising from use of this tool. Results are for informational purposes only. · A Free Tool by MonitorGiant
What is Text Diff Checker?
The Text Diff Checker compares two blocks of text — original and modified — and shows exactly what was added, removed, and kept unchanged. Added lines are highlighted in green, removed lines in red, and unchanged lines are shown in neutral. The diff is rendered in a side-by-side or unified view and can be copied or downloaded as a plain-text file. The tool uses a standard diff algorithm similar to the Unix diff command.
How to use this tool
- 1 Paste your original text into the left panel ('Before').
- 2 Paste the modified text into the right panel ('After').
- 3 The diff renders automatically — green lines were added, red lines were removed.
- 4 Use the 'Ignore whitespace' toggle if you want to focus on content changes only, ignoring formatting differences.
- 5 Click 'Copy diff' to copy the result, or 'Download' to save it as a .txt file.
When would you use this?
- Reviewing changes to a configuration file, SQL migration, or infrastructure-as-code template before applying it to production.
- Comparing two versions of a document or contract to identify what changed between drafts without reading both in full.
- Debugging an issue where a file looks the same but behaves differently — the diff can reveal invisible characters or encoding differences.
How Text Diff Checker works
- 1
Paste your two texts
Put the original (before) text on the left and the modified (after) text on the right. You can compare code, prose, configuration files, JSON, markdown — any plain text.
- 2
Choose comparison options
Toggle "Ignore case" to treat uppercase and lowercase as equal. "Ignore whitespace" trims each line before comparing. "Ignore blank lines" skips empty lines to reduce noise.
- 3
Read the highlighted diff
Lines are colour-coded: green with + means added, red with − means removed, and grey means unchanged. The summary bar shows counts. Copy the diff or download it as a .diff file.
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