Instantly compare text, code, or documents side by side. Highlight differences line by line with word-level precision. Private, fast, and 100% client-side.
✓ 100% Private✓ No Login⚡ Client-Side OnlyFree forever
Text A (Original)
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Drop file here
Text B (Modified)
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Drop file here
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← Text A (Original)
Text B (Modified) →
Why Use a Visual Text Diff Tool?
Whether you're reviewing code changes, editing documents, or auditing configuration files, spotting differences manually is slow and error-prone. A visual diff tool speeds up the process by highlighting exactly what changed — line by line and word by word.
This tool works entirely in your browser. Nothing is uploaded, stored, or logged. Your text is 100% private, making it safe even for sensitive content like contracts, credentials, or proprietary code.
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Instant Comparison
Results appear the moment you click Compare. No waiting, no server round-trips.
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100% Private
Runs entirely in your browser. Zero uploads. Zero tracking. Safe for sensitive data.
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File Upload
Load .txt, .js, .json, .html, .py, .md, and more directly from your device.
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Word-Level Diff
Highlights individual words changed within a line — not just the whole line.
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Split + Unified View
Side-by-side or traditional unified diff format — switch instantly.
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Sync Scroll
Both diff panels scroll together so you always stay in context.
How to Compare Two Texts Online
Step 1 – Paste or load your texts
Paste content directly into the Text A and Text B editors, or click Load file to open any plain-text file from your device. You can also drag and drop a file directly onto each panel.
Step 2 – Configure comparison options
Use the toolbar to control how differences are detected. Enable Ignore whitespace to skip indentation differences, or enable Ignore case for case-insensitive matching. Turn on Word-level diff to highlight individual changed words inside each modified line.
Step 3 – Click Compare Texts
The tool instantly runs a line-by-line diff algorithm based on the LCS (Longest Common Subsequence) approach, the same method used by Git. Results show added lines in green, removed lines in red, and summary statistics above the output.
Step 4 – Switch views and export
Toggle between Split view (side by side) and Unified view (classic diff format with + / - prefixes). Use the Copy Diff button to copy the diff output as plain text.
Common Use Cases for Online Text Comparison
Compare code changes – Review differences in JavaScript, Python, PHP, TypeScript, or any language before a commit.
JSON and config file diff – Spot differences between two versions of package.json, .env files, or YAML configs.
Document proofreading – Compare two drafts of a contract, essay, or legal document side by side.
SEO content auditing – Verify that updated copy matches the intended changes without accidental edits.
Git diff alternative – Get a visual diff without the command line, useful in environments where Git isn't available.
Translation comparison – Align two translated versions of a document to spot omissions or additions.
Log file analysis – Compare log snapshots from different time periods to identify new errors or patterns.
Frequently Asked Questions
Paste or load content into the Text A and Text B panels, then click Compare Texts. Differences will be highlighted instantly with line-by-line and word-level accuracy. You can also drag and drop files directly onto each panel.
Yes. This tool runs 100% in your browser using JavaScript. No text is sent to any server, no data is uploaded, and nothing is stored or logged. Your content never leaves your device — making it safe even for sensitive or confidential information.
Yes. The tool works for any plain text format: JavaScript, Python, PHP, TypeScript, CSS, HTML, JSON, YAML, XML, Markdown, and more. You can load these files directly using the Load file button or by drag and drop.
Split view displays Text A and Text B side by side with color-coded differences, making it easy to visually compare lines in context. Unified view shows a single column with added lines prefixed by "+" and removed lines prefixed by "−", similar to the output of git diff.
Word-level diff highlights individual words within a changed line that are different, not just the entire line. This is useful when comparing long lines with small changes — you can immediately see exactly which words were added or removed.
There is no hard limit imposed by this tool. Since it runs entirely in your browser, the practical limit depends on your device's available memory. Modern devices can typically handle text comparisons of several megabytes without issues.
The tool uses an LCS (Longest Common Subsequence) algorithm, which is the same foundational approach used by Git, Unix diff, and most professional diff tools. It finds the longest sequence of lines common to both texts, then marks everything else as added or removed.
Visual Diff Tool vs. Command-Line Diff
Tools like git diff and the Unix diff command are powerful but require a terminal and familiarity with command-line output. This visual diff tool gives you the same algorithmic accuracy in a browser-based interface — no installation, no setup, no learning curve.
It's ideal for designers, writers, and non-developers who need to compare document versions, as well as developers who want a quick visual check without leaving the browser.