File Compression Tool

The LeanTul File Compression Tool is a browser-based utility that allows you to compress multiple files into a single archive directly on your device. With support for popular formats like ZIP, 7z, and TAR.GZ, you can reduce file sizes for storage or sharing without uploading your data to any server.

Unlike online compression services that require uploading your files to remote servers, our tool performs all compression operations locally in your browser using WebAssembly technology. This ensures complete privacy and security - your files never leave your device.

• Multiple Format Support: Create ZIP, 7z, and TAR.GZ archives with a single click
• Adjustable Compression Levels: Choose between Store (no compression), Normal, or Maximum compression
• Batch Processing: Compress multiple files into one archive simultaneously
• 100% Client-Side: All compression happens in your browser - no server uploads required
• Progress Tracking: Real-time feedback on compression progress
• Privacy-Focused: Your files remain completely private on your device
• Free and Unlimited: No file size limits, no usage restrictions, completely free
• Cross-Platform: Works on desktop and mobile browsers

1. Select Files: Click the file icon in the toolbar to choose one or more files you want to compress
2. Choose Format: Select your desired archive format (ZIP, 7z, or TAR.GZ) from the format toggle buttons
3. Set Compression Level: Choose Store (fastest, no compression), Normal (balanced), or Maximum (smallest file size)
4. Compress: Click the compress button to start creating your archive
5. Download: Once compression is complete, click the download button to save your archive

The tool displays real-time progress during compression and shows you the compression ratio when finished, so you can see exactly how much space you saved.

ZIP Format

ZIP is the most widely supported compression format, compatible with virtually every operating system and device. It offers good compression ratios and fast processing speeds, making it ideal for general-purpose file compression and sharing.

7z Format

7z (Seven Zip) typically provides the best compression ratios, especially with the Maximum compression level. While compression takes longer than ZIP, the resulting file sizes are often 30-70% smaller. 7z is supported by most modern archive utilities.

TAR.GZ Format

TAR.GZ combines the TAR archiving format with GZIP compression. It's the standard format for Unix/Linux systems and is excellent for preserving file permissions and directory structures. This format is commonly used for software distribution and backups.

Store (Level 0)

Files are archived without compression. This is the fastest option and useful when you want to bundle files together without reducing their size, or when files are already compressed (like JPEGs or MP4s).

Normal (Level 5)

Provides a balanced approach between compression speed and file size reduction. This is the recommended setting for most use cases, offering good compression in a reasonable amount of time.

Maximum (Level 9)

Applies the highest compression algorithms to achieve the smallest possible file size. This takes longer to process but is ideal when minimizing file size is the priority, such as for long-term storage or when bandwidth is limited.

Privacy is our top priority. The LeanTul File Compression Tool operates entirely within your browser using WebAssembly technology. This means:

• No Uploads: Your files are never uploaded to our servers or any third-party service
• No Storage: We don't store, log, or have any access to your files or data
• Local Processing: All compression operations happen on your device using your computer's resources
• No Tracking: We don't track which files you compress or monitor your usage
• Secure Connection: The tool is served over HTTPS to ensure secure communication

Your sensitive documents, photos, and files remain completely private throughout the entire compression process.

• Email Attachments: Compress multiple files into a single archive to attach to emails, especially when file size limits apply
• File Storage: Reduce the amount of storage space needed for archived documents, photos, or backups
• Web Downloads: Create downloadable packages for sharing files with colleagues or clients
• Mobile Device Storage: Compress files on mobile devices to free up valuable storage space
• Backup Creation: Bundle related files together for easier backup and organization
• Software Distribution: Package multiple files or directories for software releases

The File Compression Tool uses modern web technologies including WebAssembly and is compatible with:

• Chrome 57+ (Desktop and Mobile)
• Firefox 52+ (Desktop and Mobile)
• Safari 11+ (Desktop and iOS)
• Edge 79+ (Chromium-based)
• Opera 44+

For the best performance, we recommend using the latest version of your preferred browser. Mobile devices may experience slower compression speeds compared to desktop computers, particularly with Maximum compression levels on large files.

Is there a file size limit?

There's no artificial limit imposed by our tool, but practical limits depend on your device's available memory. Most modern devices can handle files up to several hundred megabytes. Very large files (multiple gigabytes) may cause performance issues or browser memory errors.

How many files can I compress at once?

You can select as many files as you want. The tool will bundle them all into a single archive. However, more files and larger total sizes will increase processing time.

Which format should I choose?

Use ZIP for maximum compatibility, 7z for best compression ratios, and TAR.GZ for Unix/Linux systems or when preserving file permissions is important.

Why does Maximum compression take so long?

Maximum compression uses more complex algorithms that analyze data more thoroughly to achieve smaller file sizes. This requires significantly more processing power and time, especially for large files.

Can I compress already compressed files?

Yes, but you won't see much size reduction. Files like JPEGs, MP4s, and PDFs are already compressed, so compressing them again provides minimal benefit. In these cases, use Store mode to simply bundle files together.

Do compressed archives work on all devices?

ZIP files are universally supported. 7z and TAR.GZ files require compatible extraction software, which is available for free on all major operating systems (7-Zip, The Unarchiver, WinRAR, etc.).

Is this tool free to use?

Yes, completely free with no limitations on usage, file sizes (within browser memory constraints), or number of compressions.