Introducing QZL Compare: A Free, Browser-Based File & Folder Diff Tool
Ever wished you had Beyond Compare — the beloved diff tool — but for free, right in your browser, without installing anything or worrying about your code leaking to a server? That's exactly what QZL Compare is built to be.
QZL Compare is a free, open-source, browser-based comparison tool that lets you diff files, whole folders, and raw text — all processed locally in your browser. Your files never leave your machine.
🛠️ Three Powerful Comparison Modes
📄 File Diff — Side-by-Side Line Comparison
Open two files and get an instant side-by-side diff with line-by-line highlighting. Changed lines are color-coded (green = added, red = deleted, orange = modified) and character-level inline diffs show you exactly what changed within a line.
- Navigate diffs with F7 / F8 or toolbar arrows
- Counter shows your position (e.g. 3 / 15 differences)
- Copy-sync buttons to push changes left ↔ right
- Toggle line numbers on/off
📁 Folder Diff — Compare Entire Directories
Select two folders and QZL Compare recursively scans both, giving you a filterable, sortable table of every file with its status.
- Status badges: Identical, Different, Left-only, Right-only
- One-click filters + file counts per category
- Sort by name, status, size, or modified date
- Click any file to open a side-by-side diff instantly
- Automatically skips
.git,node_modules,__pycache__, and other noise
📝 Text Compare — Paste & Compare Anywhere
No files? No problem. Paste or type any text into the two panels and see a live diff as you type (updates every 300 ms). Works even on Firefox and Safari where the File System Access API isn't available.
- Character-level inline highlighting
- Gutter copy buttons (→ / ←) per diff block
- Keyboard shortcuts: Alt+→ copy left→right, Alt+← copy right→left
- Load/Save text from files (on supported browsers)
✨ Standout Features
Flexible Options
Ignore whitespace (trailing, all, or in changes only), toggle case sensitivity, and normalize line endings (CRLF/LF).
100% Private
All diffing runs in your browser. Zero server uploads. No account. No tracking. Safe for confidential code and documents.
No Install Needed
Open a browser tab and start comparing instantly. No downloads, no extensions, no setup — ever.
Clean Dark UI
A sleek dark-themed interface with intuitive color coding. Easy on the eyes during long code review sessions.
Smart Performance
LCS algorithm with smart fallbacks for large files (5 000+ lines). Large folders load lazily for snappy browsing.
Cross-Platform
Works on any OS — Windows, macOS, Linux — as long as you have Chrome, Edge, or Opera 86+.
⚙️ Comparison Options
| Option | What It Does |
|---|---|
| Ignore Whitespace | None / Trailing / All / In changes only — controls how spaces and tabs are treated |
| Case Sensitive | When off, uppercase and lowercase are considered equal |
| Ignore Line Endings | Treats CRLF and LF as identical — great for cross-platform projects |
| Show Line Numbers | Toggle numbered gutters on the diff panels |
QZL Compare uses the browser's native File System Access API. Your files are read directly into memory for diffing and are never uploaded anywhere. There are no analytics scripts watching your edits, no logins, and no accounts. It's a tool that simply respects your privacy.
Full file/folder diff requires Chrome 86+, Edge 86+, or Opera 72+. Firefox and Safari users can still use the Text Compare mode without any restrictions.
👩💻 Who Is It For?
QZL Compare is built for anyone who needs to compare files quickly without spinning up a desktop app:
- Developers reviewing code changes or config files
- DevOps engineers comparing deployment configs across environments
- Technical writers spotting changes between document versions
- Students & educators checking submitted code for differences
- Anyone who just needs to find what changed between two text files
🚀 Getting Started in 30 Seconds
- Visit compare.qz-l.com
- Choose a mode: Files, Folders, or Text
- Open your files/folders (or paste text)
- Browse diffs, navigate changes, and copy edits across panels
That's it. No registration, no credit card, no waiting.
⚖️ Ready to Start Comparing?
QZL Compare is free, instant, and respects your privacy.
Give it a try and say goodbye to expensive diff tools.
❤️ Support This Blog
If this post helped you, you can support my writing with a small donation. Thank you for reading.
Comments
Post a Comment