Text Diff Checker
Compare two text blocks and highlight added or removed lines.
Compare two blocks of text
Paste the old text on the left and the new text on the right. The text diff checker marks added lines in green and removed lines in red.
It works well for code snippets, config files, logs, notes, and small documents.
When a diff helps
A diff view is faster than reading two long blocks by eye. It shows what changed before you copy text into a ticket, commit code, or update a config file.
- Find changed lines in code
- Compare old and new settings
- Review edited copy before publishing
- Check API responses from two runs
How to use Text Diff Checker
The text diff checker compares two blocks of text and highlights what changed. It is handy for small reviews when opening a full diff tool feels too much.
Developers often use this page when they need diff checker, text diff checker, online diff checker, and code diff checker.
Privacy and data handling
This tool is designed to run in your browser for normal use, so your input does not need to be sent to a server.
- Input and output stay on the page while you work.
- Copy buttons use your browser clipboard permission when available.
- Avoid pasting private production data on shared or untrusted devices.
Examples
Compare two config values
Input
Old: timeout=30
New: timeout=60Output
- timeout=30
+ timeout=60A small diff is often enough to spot the exact setting that changed.
Steps
- 1Paste the old text on the left.
- 2Paste the new text on the right.
- 3Review added, removed, and changed lines.
Common use cases
- Compare two config snippets.
- Check edits in release notes or documentation.
- Find small changes in copied code or text.
Practical tips
- Normalize whitespace first if indentation is not important.
- For large code reviews, use Git or your editor diff view.
- Copy exact text from source files to avoid hidden changes.
FAQ
What does a text diff show?
It shows lines or parts of text that were added, removed, or changed between two versions.
Can I compare code with this tool?
Yes. It works with plain text, so you can compare code snippets, JSON, config files, or documentation.