Text Compare & Diff Checker
Spot every difference in your text or code instantly — with full privacy.
No login, no upload, no noise. Processed entirely in your browser.
Discover Our Specialized Tools
Professional-grade comparison for every developer workflow.
Text Diff
JSON & Dev Tools
Code Comparison
Frequently Asked Questions
Clear answers to your comparison queries.
DiffStack is a free online tool to compare two pieces of text or code side-by-side. It highlights additions and deletions instantly in your browser.
Yes. DiffStack runs entirely in your local browser environment. No text or code is ever sent to our servers, ensuring 100% privacy.
Yes. DiffStack is completely free with no registration, subscriptions, or usage limits. Paste your text and compare instantly.
You can compare any plain-text content: source code (JavaScript, Python, Java, and more), JSON, XML, YAML, CSV, Markdown, SQL, HTML, CSS, or regular text and paragraphs.