Compare Text Online — Compare 2 Texts Side by Side
Paste two texts below and instantly see every difference highlighted — word by word and character by character. Free text compare with side-by-side and unified views, similarity scoring and file upload. SnapTextCompare runs entirely in your browser, so your text is never uploaded or stored.
No comparison yet. Paste or upload text in both fields below — results appear here automatically, and nothing is calculated until you do.
Compare your two texts
Original Text (A)0 words
Modified Text (B)0 words
Why Use an Online Text Comparison Tool?
Whether you're reviewing edits on a blog post, checking contract changes, or comparing code versions, an online text comparison tool saves you from the tedious work of reading two versions side by side. Instead of squinting at paragraphs, you get instant visual feedback showing exactly what was added, removed, or modified.
SnapTextCompare processes everything locally in your browser using advanced diff algorithms. This means your sensitive documents — whether legal contracts, proprietary code, or personal writing — never touch a server. Compare with confidence.
Unlike desktop tools that require installation or subscription-based services that lock features behind paywalls, SnapTextCompare gives you professional-grade text comparison for free. Word-by-word precision, character-level highlighting, file upload support, and export options — all from your browser.
How to Compare Text Online
Step 1: Paste your original text into the left text area, or drag and drop a file (TXT, PDF, DOCX).
Step 2: Paste the modified version into the right text area.
Step 3: Differences are highlighted instantly — green for additions, red for removals, with character-level precision.
Step 4: Use options like "Ignore case" or switch between word/line mode to refine results. Export when done.
Common Use Cases for Text Comparison
Document editing: Writers and editors compare draft versions to track changes across revisions, ensuring nothing is accidentally lost or added.
Legal review: Attorneys and contract managers verify that amendments match agreed-upon changes — catching unauthorized edits before signing.
Code review: Developers compare code snippets, config files, or API responses to catch regressions and verify changes before deployment.
Academic work: Students compare essay drafts to see how their writing evolved, or verify that instructor feedback has been properly addressed.
Related comparison tools
How SnapTextCompare works
Diff engine
Google's diff-match-patch (Apache 2.0), running in your browser. Character mode diffs raw characters; word and line modes encode tokens or lines first and diff those, then decode the result.
Similarity & importance
Similarity = 1 − Levenshtein / max(len). Importance weighs each change by category — money and dates score 90+, punctuation scores 3. Deterministic on any device.
Privacy
Files are read with the HTML5 File API and processed in your browser. No network request is ever made with your content — verifiable in the Network tab of your browser's DevTools.
PDF extraction uses pdf.js (Mozilla). Word extraction uses mammoth.js. UTF-8 with or without BOM is auto-detected; CRLF line endings are normalised to LF before diffing so cross-OS files don't appear entirely changed.
Learn More About Text Comparison
The Ultimate Guide to Comparing Text
Everything about text comparison — tools, methods, and real use cases.
How to Compare Two Texts Online
A practical walkthrough for comparing any two texts online.
What Is a Diff Tool?
A jargon-free explanation of diff tools and how they work.
Best Diff Tool Online
A breakdown of the best free diff tools available online.
Compare Text FAQ
Common questions about online text comparison.