What file types are supported?

PureDiff works with any text-based files. You can paste text directly or upload files like .txt, .js, .ts, .json, .md, .css, .html, and more.

How does the diff algorithm work?

PureDiff uses a line-by-line Longest Common Subsequence (LCS) algorithm to identify differences. It's optimized for files up to 2000 lines and handles edge cases like CRLF differences and trailing whitespace.

Can I compare large files?

PureDiff works best with files under 2000 lines. For very large files, you may experience slower performance. The tool will show a warning if your files are very large.

Client-Side File Comparison

Compare files securely with
PureDiff

Compare files privately in your browser. Nothing leaves your machine. 100% client-side logic with no server uploads.

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100% Private

All processing happens in your browser. No data is sent to any server.

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Fast & Secure

Compare files instantly with our optimized diff algorithm. No external services.

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Multiple Views

Switch between side-by-side and inline diff views for better readability.

Ignore whitespace

Left

1 line

Right

1 line

No content to compare

Paste text or upload files to get started.

Frequently Asked Questions

Everything you need to know about PureDiff.

Compare files securely withPureDiff