1Original Text (Left)
2Modified Text (Right)
Visual Diff Output
Side-by-Side View (lines mode)| # | Original Text | # | Modified Text |
|---|---|---|---|
| 1 | function calculateTotal(price, taxRate) { | 1 | function calculateTotal(price, taxRate, discount = 0) { |
| 2 | // Calculate basic total | 2 | // Calculate basic total with optional discount |
| 3 | const tax = price * taxRate; | 3 | const discountedPrice = price - discount; |
| 4 | const grandTotal = price + tax; | 4 | const tax = discountedPrice * taxRate; |
| 5 | console.log("Processing order..."); | 5 | const grandTotal = discountedPrice + tax; |
| 6 | return grandTotal; | 6 | console.info("Processing verified order with discount..."); |
| 7 | return Math.round(grandTotal * 100) / 100; | ||
| 7 | } | 8 | } |
Why Use This Diff Checker?
Engineered for precision, speed, and privacy.
Side-by-Side Comparison
Inspect original and updated documents right next to each other with color-coded line additions and removals.
3 Diff Modes
Switch between Line Diff (code files), Word Diff (articles & copy), or Char Diff (typos & punctuation).
100% Client-Side Privacy
Your text never travels over the network or saves to external servers. All diff calculations happen locally in your browser.
Ignore Whitespace & Case
Eliminate noise from tab indentations, trailing spaces, or capitalization changes to focus strictly on text substance.
File Upload & Export
Upload text or code files directly (.txt, .js, .json, .py, .md) and export standard unified diff patches in one click.
Shareable URLs & Snapshots
Generate share links with Base64 parameters or save local snapshots to revisit your work anytime.
Common Use Cases
- Source Code Reviews: Spot bugs and modifications between two versions of code snippets.
- Content Proofreading: Verify editorial changes in drafts, blog posts, and translations.
- Contract & Legal Edits: Audit revisions, clause updates, and agreement changes.
- Config & JSON Comparison: Check differences in server configurations or JSON payloads.
- Academic Submissions: Cross-reference revisions and essay revisions easily.
Diff Modes Breakdown
| Mode | Ideal For | Granularity |
|---|---|---|
| Line Diff | Source code, logs, structured files | Medium (Line-level) |
| Word Diff | Articles, books, copy, sentences | High (Word-level) |
| Char Diff | Typos, strings, regex, hex dumps | Maximum (Char-level) |
Frequently Asked Questions
No. The diff algorithm executes entirely inside your client browser. Your sensitive documents, proprietary code, and notes are never transmitted to external APIs or servers.
You can upload any plain text or source code file, including
.txt, .js, .ts, .json, .py, .html, .css, .sql, and .md. When you click "Share", both texts are encoded into standard Base64 query parameters in the link URL. Anyone who opens the URL will instantly view the exact same comparison state.
Yes! Turn on the "Ignore Whitespace" toggle to ignore differences in spaces and tab indentations, highlighting only real content changes.