Free Online Text Diff Checker – Compare Two Texts Instantly
Paste two versions of a text and spot every difference instantly. Side‑by‑side comparison, inline word highlighting, file upload, and many more options. 100% private – no data leaves your browser.
Why you'll love this diff tool
Ever had two versions of a document and no clue what actually changed? Manually comparing them line by line is painful and mistakes happen. That's exactly why we built this thing. Our diff checker grabs your two text chunks, runs a fast comparison algorithm (all in your browser, nothing leaves your computer), and paints the changes in green and red. It's that simple.
- No waiting around. Comparisons happen instantly – no page reloads or progress bars.
- Clear visual cues. Added lines are green, removed ones are red, and unchanged text stays neutral.
- Flexible ignore options. Toggle case, whitespace, and even punctuation so you only see what matters.
- 100% private. Your text never touches a server. All the work happens right inside your browser.
- Works offline. Once the page loads you can even disconnect your WiFi and keep comparing.
How to compare texts (takes about 10 seconds)
- Put the original text in the left box. You can type, paste, or upload a file – whatever's easiest.
- Put the new version in the right box. Same deal, upload or paste. The tool handles .txt, .md, .json, .csv, and more.
- Pick your options. Check the boxes if you want to ignore case, whitespace, punctuation, or hide matching lines.
- Choose how you want to see the diff. Unified view stacks everything in one list; side-by-side puts the two versions next to each other.
- Hit Compare (or press Ctrl+Enter). The differences appear immediately below the buttons.
- Save, share, or print. Use the Copy, Export, or Print buttons to keep a record of what changed.
Who's already using this
| User | How they benefit |
|---|---|
| Developers | Compare code snippets, config files, or logs to quickly spot what changed. |
| Writers & Editors | Track revisions between drafts and see exactly what was edited. |
| Students | Compare paper versions to ensure you haven't accidentally deleted content. |
| Legal Professionals | Detect changes in contract clauses or agreements (think red‑lining). |
| Translators | Check that no part of the source text was omitted in the translation. |
Stories from real people
Arjun's config fix
"I compared an old server config with the new one. The diff checker instantly showed the missing line that was breaking everything. Saved me an hour of manual staring." – Arjun, Bengaluru
Olga's translation check
"I pasted the English source and my Russian translation. The line‑by‑line view showed me I'd accidentally skipped a paragraph. Lifesaver!" – Olga, Kyiv
Mark's contract review
"I had two versions of a contract. The diff checker highlighted every changed word. I immediately spotted a new clause the other party had slipped in." – Mark, Chicago
Lin's essay revision
"I compared my first draft with my final submission to be sure I hadn't accidentally overwritten important paragraphs. The green/red highlights made it obvious." – Lin, Singapore
Fun ways people use this diff checker
- Code review – compare code before and after a bug fix.
- Plagiarism detection – check if two pieces of writing are too similar.
- Game cheat prevention – compare game config files to detect tampering.
- Document version control – see what changed between meeting minutes versions.
- Education – show students exactly which words they improved in their revision.