Find changed lines
Isolate the lines that changed so deployment config and document edits are easier to review.
Text Diff Checker
🔒 Browser-side processing
Compare two text blocks line by line.
Guide
Text diff workflow notes
Compare two similar text blocks such as config files, drafts, or API responses and focus on the changed lines.
Copyable diff output
Review changes in a unified diff style that is easy to paste into issues, pull requests, or team chat.
Compare sensitive text locally
The comparison runs in the browser, reducing the need to paste internal values into external diff services.
More: how to use it, examples, and common errors
Workflow
How to use it
- Paste the original text and the revised text into the two input areas.
- Check whether line endings, spacing, or indentation are part of the meaningful change.
- Review added, removed, and changed lines in the result area.
- Mask sensitive values before copying the diff for sharing.
Examples
Real input and output
Spotting a config change
Input
Left
timeout: 30
retries: 3
Right
timeout: 60
retries: 3Output
- timeout: 30
+ timeout: 60
retries: 3Troubleshooting
Errors you will hit
Everything differs but you changed nothing
The line endings differ. Windows uses CRLF while macOS and Linux use LF. Mismatched editor or git settings mark every line as changed.
One character changed but the whole line is flagged
Comparison is line based. To find the exact character on a long line, split it into shorter lines before comparing.
Tabs mixed with spaces
They render at the same width but are different characters. If you see a wall of indentation-only differences, normalize whitespace first.
Review
Things to check
Whitespace can matter
JSON, YAML, and Markdown can be affected by indentation and spacing, so inspect formatting changes deliberately.
Large inputs
Very large logs or files can use a lot of browser memory. Compare only the relevant section when possible.
Related
Tools that pair well
- Regex Tester
- Markdown — Review Markdown documents such as READMEs, release notes, and issue templates as rendered output and generated
- Case Converter — Convert API fields, environment variables, filenames, and document titles into camelCase, snake_case, kebab-ca
- Text Cleaner — Clean repeated editing tasks such as trimming whitespace, removing duplicate lines, sorting, and slugifying te
- Text Stats — Check characters, words, lines, and estimated reading time for input limits, draft length, and UX copy sizing.