CompareTxt — Fast, private, offline file & folder diff for Windows
Hey 👋
I built CompareTxt because I was tired of uploading sensitive files to random online diff tools just to see what changed between two versions.
CompareTxt is a fast, fully offline tool for comparing text files and folders side by side on Windows.
What it does:
🔍 Side-by-side file comparison with synchronized scrolling and line-by-line diff highlighting (added/removed/modified)
📁 Folder comparison — see full structure differences at a glance, with each item flagged as Added, Removed, Modified, or Identical
🎯 Filter folder views by status to focus only on what changed
🔀 Merge changes between files or folders, with full undo support
🖱️ Deep File Explorer integration — right-click "Select for Compare" then "Compare with Selected," no need to open the app first
🌓 Light and dark themes for long comparison sessions
🌐 Automatic encoding and language detection
Why it's different:
100% private — no account, no sign-in, no internet connection needed. Your files never leave your machine.
Zero telemetry — nothing is collected, transmitted, or shared.
Fast, even on large files and big folder trees.
Clean UI — built to stay out of your way during long review sessions.
Whether you're reviewing code changes, reconciling document versions, checking configs, or just verifying two folders match, CompareTxt gives you a clear answer in seconds — without your data ever touching someone else's server.
Would love your feedback, especially on what comparison features you'd want next
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