QZL Compare: Free Browser-Based File & Folder Diff Tool

We're excited to announce the launch of QZL Compare — a powerful, free, browser-based comparison tool that lets you diff files, folders, and text without installing anything or uploading your data to a server.

⚖️ What is QZL Compare?

QZL Compare is a free, open-source diff tool that runs entirely in your browser. It's built for developers, DevOps engineers, technical writers, and anyone who needs to quickly compare code, configuration files, or documents — all while keeping your data 100% private.

No accounts. No uploads. No tracking. Just instant file comparison.

Try it now: compare.qz-l.com

🛠️ Three Powerful Comparison Modes

📄 File Diff — Side-by-Side Comparison

Compare two files line-by-line with color-coded highlighting (green for additions, red for deletions, orange for modifications). Character-level inline diffs show you exactly what changed within each line.

Features:

Navigate diffs with F7/F8 keyboard shortcuts

Copy changes left ↔ right with sync buttons

Toggle line numbers on/off

Difference counter (e.g., "3 / 15 differences")

📁 Folder Diff — Compare Entire Directories

Select two folders and QZL Compare recursively scans both, giving you a sortable, filterable table showing every file's status.

Features:

Status badges: Identical, Different, Left-only, Right-only

One-click filters with file counts per category

Sort by name, status, size, or modified date

Click any file to view side-by-side diff

Automatically skips .git, node_modules, __pycache__, and other common folders

📝 Text Compare — Paste and Compare

No files? Just paste or type text into two panels and see a live diff as you type (updates every 300ms). Perfect for quick comparisons on any device.

Features:

Character-level inline highlighting

Keyboard shortcuts: Alt+→ (copy left→right), Alt+← (copy right→left)

Load/Save text from files on supported browsers

Works on Firefox and Safari where File System Access API isn't available

✨ Key Features

⚙️ Flexible Options — Ignore whitespace (trailing, all, or in changes only), toggle case sensitivity, and normalize line endings (CRLF/LF)

🔒 100% Private — All processing happens in your browser. Files never leave your machine. No server uploads, no accounts, no tracking

🚀 No Install — Open a browser tab and start comparing instantly. Works on Chrome, Edge, Opera 86+

🎨 Clean Dark UI — Sleek interface with intuitive color coding, easy on the eyes during long review sessions

⚡ Smart Performance — LCS algorithm with fallbacks for large files (5,000+ lines). Lazy loading for large folders

🌐 Cross-Platform — Works on Windows, macOS, Linux — any OS with a modern browser

👩‍💻 Who Is It For?

QZL Compare is perfect for:

Developers reviewing code changes, config files, or refactoring

DevOps engineers comparing deployment configs across environments

Technical writers spotting changes between document versions

Students & educators checking code submissions for differences

Anyone who needs to find what changed between two text files

🚀 Getting Started

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.

🔒 Privacy First

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.

🌐 Browser Compatibility

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.

Try It Now

QZL Compare is free, instant, and respects your privacy. Give it a try and say goodbye to expensive diff tools:

👉 compare.qz-l.com

We'd love to hear your feedback! Let us know what you think or if you have feature requests for future updates.