Diffmate

Compare million-row CSV & Excel files in your browser — free

2 followers

Compare million-row CSV & Excel files in your browser — free

2 followers

Free browser tool to compare CSV, Excel, PDF & text files. No install, no signup, files never leave your device. Drop two files and see every change highlighted side by side. Handles million-row files without freezing, powered by a Web Worker diff engine. Added, modified, and deleted lines are color-coded for instant review.

Free

Launch tags:Productivity•Developer Tools•Vibe coding

Launch Team / Built With

Tines Build agents & automations integrated across your workspace

Promoted

Maker

📌

Hey everyone! I'm the maker of DiffMate. I built this because I was frustrated with comparing Excel reports at work. Every month I'd spend 30+ minutes setting up VLOOKUP formulas, and large CSV files would just crash Excel entirely. So I built a browser-based comparison tool that: - Handles million-row files without freezing - Never uploads your files anywhere (100% client-side) - Works instantly — no installation or signup The diff engine is a JavaScript port of Python's difflib SequenceMatcher, running in a Web Worker so the UI stays responsive. I'd love your feedback! What file formats or features would you want to see next? Try it free: https://diffmate.work

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3mo ago

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