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Visual side-by-side diff for two texts with char-level highlights. Use as default diff tool; for similarity score use string-comparison, for JSON use json-diff. Input: two texts ≤10MB. Returns visual diff. 100% client-side.
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Visual text diff comparison tool with side-by-side and inline modes. Highlights additions in green and deletions in red using an LCS-based diff algorithm. Shows line numbers and provides diff statistics (added, removed, unchanged lines).
Comparing two text files or code snippets visually is essential for code review, documentation updates, and content editing; this tool provides a quick, client-side diff comparison without needing command-line tools.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Developers comparing code changes, technical writers reviewing document edits, QA testers verifying configuration changes, and anyone who needs to visually compare two pieces of text.
Paste the original text in the left textarea
Paste the modified text in the right textarea
Choose between Side by Side or Inline view mode
Green highlighted lines show additions, red shows deletions
Use the Copy Diff button to copy the unified diff output
Review the stats bar for a quick count of changes
Compare two versions of a README.md file to see documentation changesDiff a JSON configuration before and after adding new environment variablesCompare two SQL queries to find the differences in logicWhat diff algorithm is used?
The tool uses a Longest Common Subsequence (LCS) based algorithm to compute the minimum number of additions and deletions.
Does it handle large files?
The tool works best with text under a few hundred lines. Very large files may slow down the browser.
Can I diff binary files?
No, this tool is designed for text comparison only.
What does the Copy Diff button copy?
It copies a unified diff format with + for additions, - for deletions, and space for unchanged lines.
Authoritative specifications, standards, and in-depth reading for Text Diff Visualizer.
LCS-based diff with line/word/character granularity. All processing is done client-side. Use ignore flags to skip whitespace/case differences.
Sort lines alphabetically and remove duplicates. Use when cleaning lists; for comparing two texts use text-diff-visual. Input: text lines ≤10MB. Returns sorted unique lines. 100% client-side.
Find and replace text with literal, regex, and case-insensitive modes. Shows replacement count.
Reverse text by characters (grapheme-safe for emoji), words, or lines.
Count words, characters, and sentences. Get reading time and Flesch score as you type.
Preview rendered Markdown without editing. Use for quick read-only preview; for editing use markdown-editor, for HTML output copy use markdown-to-html. Input: Markdown ≤10MB. Returns rendered HTML preview. 100% client-side.
Generate URL slugs from titles with lowercase rules. Use as default slug tool; slugify-string is a noindex alias. Input: text ≤10MB. Returns slug string. 100% client-side.
Obfuscate strings with masking and reversible transforms. Use when hiding PII in demos; for hashing use hash-generator. Input: text ≤10MB. Returns obfuscated text. 100% client-side.
Search and copy emoji with keywords. Use when inserting emoji; for ASCII art use ascii-art. Input: search text. Returns emoji to copy. 100% client-side.