To use Diff Checker,Paste text into the text boxes below and click on Compare.
Our online diff checker tool makes comparing texts, code snippets, and files easy and fast. It's great for checking documents, debugging code, or keeping versions consistent. You'll see changes clearly in a side-by-side view.
Our text comparison tool finds and shows differences between two texts. It works well with many formats like plain text, HTML, and code snippets.
Feature | Description |
---|---|
? Real-Time Diffing | Shows differences right after you paste the text |
? Side-by-Side View | Clear layout with color-coded differences |
? Inline Highlighting | Highlights changes in lines or words |
? File Upload Support | Compares .txt, .html, .css, .js, .json, and more |
? Large Input Handling | Handles long texts and codebases well |
? Secure Client-Side Logic | All processing is in your browser for safety |
The diff checker uses Longest Common Subsequence (LCS) algorithms to find textual differences.
mermaid
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flowchart TD A[Text A Input] --> C[Normalize Text] B[Text B Input] --> C C --> D[Run LCS Diff Algorithm] D --> E[Generate Diff Map] E --> F[Render Diff Result in UI]
It shows changes in a format that's easy to read:
Insertions (in green)
Deletions (in red)
Modifications (in yellow or side-by-side)
Use Case | Benefit |
---|---|
✅ Code Review | Finds code changes easily |
? Document Editing | Compares document revisions |
? Configuration File Monitoring | Tracks config file changes |
? Content Plagiarism Detection | Finds similar content |
?️ DevOps Diff Checks | Automates file comparisons in pipelines |
You can upload and compare files in many formats, like:
.txt, .log, .csv
.html, .xml
.js, .ts, .py, .cpp
.json, .yaml
Files are processed securely in your browser. No data is sent to the server, keeping your data safe.
We offer two ways to view differences:
Mode | Best For |
---|---|
Inline View | Short text changes in a single scrollable pane |
Side-by-Side | Large documents or detailed code comparison |
Switch between modes for the best reading experience.
⚡ Lightning-Fast Processing – Instant results even with large files
? Smart Change Detection – Accurately catches subtle edits
? Clean, Responsive UI – Works seamlessly on desktop and mobile
? Zero Data Upload – 100% privacy with client-side execution
?? Developer Friendly – Built to handle code-specific syntax and indentation
The Longest Common Subsequence finds the fewest steps to change one string into another.
mermaid
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graph TD A[Input String A] --> B[Tokenize into Chunks] B --> C[Match Tokens with Input B] C --> D[Compute Longest Common Subsequence] D --> E[Mark Differences (Insert/Delete)] E --> F[Render Diff Output]
The algorithm is efficient and accurate, even with rearranged text or HTML/XML elements.
Our tool smartly handles programming language syntax. It considers:
Indentation levels
Syntax blocks (e.g., {}, [], ())
Line endings across operating systems
Common code formats like JSON, HTML, and JavaScript
Advanced users can:
Compare multiple files in sequence
Store comparison history locally (browser-based)
Export diff results as downloadable HTML or plain text
Useful for:
Daily QA routines
Audit trails
Collaboration and version reviews
Developers can use our diff logic with libraries like:
javascript
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import * as Diff from 'diff'; const diff = Diff.diffWords(oldText, newText); diff.forEach(part => { const color = part.added ? 'green' : part.removed ? 'red' : 'grey'; console.log(color, part.value); });
It can be added to:
Online editors
CMS platforms
Code repositories
DevOps dashboards
Yes. All data is processed on your device, ensuring full confidentiality.
Yes. Use the Upload File feature to import files directly from your device.
Yes. The tool is optimized for documents up to several megabytes in size.
Yes. Use the “Export” option to save comparisons for recordkeeping.
Our text and file comparison tool is fast, secure, and very accurate. It works with any content type. It has features like syntax-aware rendering and privacy-first design.
It gives you real-time results. It's perfect for developers, writers, QA engineers, and content editors.
Use it to see what changed, where, and how — instantly.
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