How to use this diff checker
- Paste the original text on the left and the changed version on the right.
- Choose whether to ignore whitespace or case differences.
- Switch between split view and unified view depending on your review style.
- Use the highlighted output to isolate the exact changes faster.
Why text comparison matters
Small differences inside long text are expensive to spot manually. That gets worse when generated markup, formatted payloads, or config files create a lot of visual noise.
A diff checker narrows attention to the lines that changed so you can focus on meaning instead of rereading everything around it.
Features
- Compare long text blocks side by side
- Highlight added, removed, and modified lines
- Switch between split and unified views
- Ignore whitespace noise when needed
- Optionally ignore casing differences
- Runs fully in the browser with no upload
Frequently Asked Questions
? What is a diff checker used for?
A diff checker compares two text inputs and highlights what changed. It is useful for code snippets, config files, generated HTML, payloads, and any text where tiny edits are easy to miss by eye.
? Can I ignore whitespace changes?
Yes. This tool includes an ignore-whitespace option so you can decide whether spacing changes are meaningful or just noise from formatting.
? Does the comparison happen locally?
Yes. The inputs are compared in your browser with no server upload.
? Should I format JSON or HTML before comparing it?
Usually yes. Formatting structured data before diffing tends to produce a cleaner and more useful result than comparing minified one-line input.