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QZL Compare

Free online tool to compare files, compare folders, and run a text diff — instantly in your browser, no install needed.

Folder CompareCompare the contents of two folders side by sideFile CompareCompare two individual files with line-by-line diff highlighting, inline character-level changes, and file sync capabilitiesText ComparePaste or type text directly into two editors and see differences highlighted in real-time

Why QZL Compare?

  • 100% private — all processing happens locally in your browser, files are never uploaded
  • Instant file difference checker — line-level diffs with character-level highlights
  • Compare folders online — detect added, removed, and modified files across entire directories
  • Text diff tool — paste text directly to see real-time differences, no file needed
  • Side-by-side & unified views — switch between layouts with one click
  • Export as patch file — download a standard .patch / unified diff for version control

💡 Use Chrome, Edge, or Chromium for full File System Access API features

Free Online File & Folder Comparison Tool — QZL Compare

QZL Compare is a free, browser-based alternative to Beyond Compare. Use it to compare files online, compare folders online, run a text diff tool, or check a file difference — all without installing anything or uploading your data. Every comparison runs locally in your browser.

Key Features

  • Side-by-side file diff with character-level inline highlighting
  • Recursive folder comparison — find added, removed, and modified files
  • Real-time text diff — paste any two strings and see differences instantly
  • Unified diff view compatible with standard patch format
  • Export diff as a .patch file for version control workflows
  • Ignore whitespace, case sensitivity, and CRLF/LF line endings
  • 100% private — no server uploads, no account required, no tracking
  • Works on Windows, macOS, and Linux in Chrome, Edge, and Opera

Use Cases

  • Developers reviewing code changes without a desktop diff tool
  • DevOps engineers comparing configuration files across environments
  • Technical writers spotting changes between document versions
  • Students comparing submitted code against reference solutions