Compare two texts and instantly see every addition, deletion, and word-level change. Side-by-side or unified view, whitespace preserved, runs in browser.
Who Uses Text Diff Checker
Editors finding exactly what changed between two drafts nobody tracked. Developers comparing a config file against the version that worked. Students checking what a reviewer altered in their submission. Anyone handed a 'slightly updated' document and told to spot the difference.
Text Diff Checker Features
- Side-by-Side & Unified View: Toggle between split (two-panel) and unified (single-panel) diff views to match your review workflow
- Word-Level Highlighting: Goes beyond line-level diffs - highlights the exact words that changed within each line
- Real-Time Comparison: Differences are computed instantly as you type or paste - no need to click a button
- Copy & Export Results: Copy the diff output to the clipboard as a reference for code reviews and document audits
- Code-Friendly: Preserves indentation, whitespace, and special characters - perfect for comparing code, config files, SQL queries, and API responses
- Change Statistics: See a summary of total additions, deletions, and modifications at a glance before diving into details
How to Use Text Diff Checker
Compare any two texts in seconds - paste, review, and export differences
- Paste Original Text: Paste the original version of your text, code, or document into the left panel
- Paste Modified Text: Paste the updated version into the right panel - differences are highlighted instantly
- Review Changes: Additions appear in green, deletions in red, and modifications are highlighted inline for easy review
- Export or Copy: Copy the diff results or use them for code reviews, document audits, and version tracking
Frequently Asked Questions
How does the Text Diff Checker work?
It uses the Longest Common Subsequence (LCS) algorithm to compare two texts line by line, then word by word inside changed lines, and highlights additions (green) and deletions (red) so you can instantly see what changed.
Can I compare code files with this tool?
Yes, it's designed for comparing any plain text including JavaScript, Python, HTML, CSS, SQL, JSON, YAML, configuration files, and more. It preserves indentation and whitespace exactly.
What's the difference between line-level and word-level diff?
Line-level diff highlights entire lines that changed. Word-level diff goes deeper - it shows exactly which words or characters within a line were added, removed, or modified. Our tool supports both modes.
Can I compare long documents or large files?
Yes, the tool handles documents with thousands of lines efficiently. The comparison runs entirely in your browser using optimized algorithms, so performance depends on your device rather than server limits.
Is there a character or word limit?
Up to 5,000 lines on each side. The tool processes everything locally in your browser.
Can I use this for tracking document revisions?
Absolutely. Writers, editors, and content teams use it to compare drafts and see exactly what was added, removed, or reworded between versions - similar to 'Track Changes' in Word but for any plain text.
Does it work with non-English text?
Yes, it supports all Unicode text including Hindi, Chinese, Arabic, Japanese, and other languages. The comparison algorithm works on characters, not language-specific rules.
Is my text data private?
Completely. The comparison runs 100% in your browser using JavaScript. Your text is never sent to any server - you can verify this by checking the Network tab in your browser's developer tools.
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