Precise Text Comparison
Compare any text by lines, words, or characters. Perfect for reviewing PDF contracts, legal drafts, essays, articles, and clause modifications with real-time color highlights.
Text & Code Diff Checker
Compare text, code, PDF and JSON in your browser. File contents are processed on your device.
100% Free
PDF & DOCX Support
Local processing
No account needed
ORIGINAL
Original Text
MODIFIED
Modified Text
How Simple Diff Works
Simple Diff is a professional text and code difference checker designed to instantly highlight modifications, insertions, or deletions between two versions of documents, source code, or files.
Source Code Comparison
An essential utility for developers comparing code in JavaScript, Python, HTML, CSS, SQL, and JSON. Inspect diffs side-by-side (split view) or unified with precise line numbers.
PDF & Visual Page Comparison
Compare PDF documents both by extracted text content and by visual page rendering using a curtain slider to spot subtle layout, font, or diagram revisions.
Local processing and privacy
Simple Diff compares content in your browser. Technical requests load the application and its resources; documents are not uploaded for comparison.
Why use our online text and code diff checker?
Whether you are a software engineer inspecting Git revisions, a reviewer verifying versions of a contract in Word or PDF, or validating JSON payloads, Simple Diff provides in-memory local computing powered by the Myers Diff algorithm. Enjoy real-time similarity metrics, addition/deletion counters, and one-click patch exports.
Frequently Asked Questions
Everything you need to know about the Simple Diff online comparison tool
Simple Diff compares content in your browser. Technical requests load the application and its resources; documents are not uploaded for comparison.
We utilize the industry-standard Myers Diff algorithm (the same foundation behind Git). Simple Diff highlights insertions, deletions, and replacements with line, word, or character precision.
JSON mode formats the content and optionally sorts object keys. Number values are preserved; duplicate keys are rejected to avoid ambiguity.
Yes! Simple Diff reads and extracts text from PDF and Word (.docx) documents directly in your browser memory. You can drag and drop PDF or DOCX files right into the input boxes to compare them with zero server uploads.
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