Diff Checker
Compare text and code with side-by-side, inline, or unified diff views. Highlights additions, deletions, and word-level changes.
Online Diff Checker — Compare Text & Code
This free online diff checker lets you compare two blocks of text or code instantly. All processing happens in your browser — nothing is sent to a server. Supports side-by-side, inline, and unified (git diff) views with word-level change highlighting.
Features
- Three view modes: Side by Side, Inline, and Unified (git diff format)
- Word-level change highlighting for modified lines
- Options to ignore whitespace, case, blank lines, and trailing whitespace
- Change navigation with Previous/Next buttons
- Copy unified diff (git apply format) or download HTML report
- Drag & drop file support
- Summary statistics with similarity percentage
FAQ
Is my data safe?
Yes — all comparisons happen entirely in your browser. Your text is never uploaded to any server.
What's the difference between the view modes?
Side by Side shows original and modified text in two columns. Inline shows deletions and additions sequentially. Unified uses git diff format with -/+ prefixes.
How large of a file can I compare?
The tool handles up to ~5,000 lines comfortably. For very large files, consider using a desktop diff tool like VS Code or Beyond Compare.
Related Tools
Format, validate, and beautify JSON with tree view and TypeScript type generation.
Test regular expressions with real-time matching, capture groups, and code snippets.
Generate UUID v4, v7, ULID, and Nano ID with bulk generation and format options.
Encode and decode text, images, and files to Base64 with real-time conversion.