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
CompareTxt is a fast, private, offline tool for comparing text files and folders side by side on Windows.
CompareTxt needs no account, no sign-in, and no internet connection, and it never collects, transmits, or shares your data — your files stay on your machine.
WHAT YOU CAN DO
1. Compare two text files side by side with synchronized scrolling.
2. Compare two folders to see their full structure at a glance, with each item flagged as Added, Removed, Modified, or Identical.
