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About this Tool
A diff checker is an online text comparison tool that analyzes two pieces of text and highlights exactly what's different between them.
Instead of reading through both versions manually, it shows you insertions, deletions, and changes in a color-coded view - so you can spot differences in seconds, not minutes.
It's used by developers reviewing code, writers comparing drafts, editors tracking revisions, students checking rewritten work, and anyone who needs to know precisely what changed between two versions of a document.
Whether you're a developer reviewing code changes, a writer comparing two drafts, or a student checking revisions, our free Diff Checker makes it effortless.
Paste your original and modified text side by side and instantly see exactly what changed - additions, deletions, and modifications highlighted line by line, word by word, or character by character.
No sign-up, no ads, no waiting. Just a clean, accurate comparison you can trust.
How to use
- Paste your original text into the left panel and your updated text into the right panel
- Differences appear instantly - green highlights show additions, red shows deletions, and yellow marks modified lines
- Switch between Lines, Words, or Characters mode depending on how granular you need the comparison to be
- Enable inline mode to see character-level changes within each modified line, side by side
- Use the Export button to download a standard .patch file, or copy the diff directly to your clipboard
Benefits
- Instantly spot changes between two drafts without reading both documents word by word
- Review code changes without a full Git setup - just paste and compare
- Catch unintended edits in contracts, essays, or legal documents before finalizing
- Compare API responses, config files, or JSON payloads to debug differences quickly
- Works entirely in your browser - your text never leaves your device
- No login required - just open and start comparing
FAQs
How do I compare two texts online for free?
Simply paste your original text into the left panel and your revised text into the right panel. The tool instantly highlights every addition, deletion, and change between the two versions - completely free, with no sign-up required.
What do the colors mean in the diff view?
Green highlights indicate lines or words that were added in the new version. Red indicates content that was removed from the original. When inline mode is on, you'll also see character-level changes within modified lines so you can pinpoint exactly what shifted.
What is the difference between Lines, Words, and Characters mode?
Lines mode compares your text line by line - best for code or structured documents. Words mode breaks the comparison down word by word, which works well for prose and articles. Characters mode goes even deeper, highlighting individual character changes - useful for spotting subtle typos or punctuation differences.
Can I use this to compare code?
Yes. The diff checker works with any plain text, including source code, JSON, YAML, HTML, and config files. For a quick comparison without setting up Git or a code editor, just paste both versions and get an instant result.
Is my text stored or shared when I use this tool?
No. All comparisons happen locally in your browser. Your text is never uploaded to a server, saved in a database, or shared with anyone. It's a fully private, client-side tool.
What is the .patch file export?
The export feature downloads your diff in a standard unified patch format - the same format used by Git and other version control systems. Lines prefixed with + were added, lines with - were removed, and unmarked lines are unchanged. You can share this file with teammates or apply it directly using patch tools.