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Document Compressor

Compress PDF, Word (DOCX) and PowerPoint (PPTX) files online for free — reduce file size by up to 80%. Easy to use, no registration required. 100% local processing for privacy.

Shrink documents without uploading them

Compress PDF and Word files locally in your browser — private even for sensitive documents.

  • Multi-Format Support

    Compress PDF, Word (DOCX) and PowerPoint (PPTX) files. Auto-detect file format, mix and match for batch processing.

  • Smart Compression

    Reduce PDF, Word and PowerPoint file sizes while keeping documents clear, well formatted and ready to use.

  • DPI Resolution Control

    PDF compression automatically adjusts resolution based on the selected quality to balance image clarity and file size.

  • Quality Control

    Adjust JPEG/WebP compression quality from 50% to 100%. 100% is the highest JPEG quality, but may still be lossy.

  • 100% Local Processing

    All compression happens in your browser using WebAssembly. Your files are never uploaded to any server.

  • Batch Processing

    Upload multiple files and compress them all at once. Mix PDF, DOCX and PPTX files, download individually or as a ZIP archive.

FAQ

What file formats are supported?
Currently supports PDF, Word (DOCX), and PowerPoint (PPTX) formats. You can upload mixed formats and the tool will automatically identify and process them.
How does the compression work?
The tool automatically chooses suitable compression for each file, reducing size while keeping documents clear, openable and ready to use.
Are my files secure? Will they be uploaded to servers?
Completely secure. All processing is done in your browser via WebAssembly technology. Your files never leave your device and are not uploaded to any server.
Will file quality degrade after compression?
You can freely adjust compression quality (50%~100%). Higher quality means larger files but clearer content; lower quality means higher compression rates. 100% is the highest JPEG quality, but may still be lossy.
Can compressed files be used normally?
Yes. Compressed files maintain their complete structure and can be opened and edited with Microsoft Word, WPS, PowerPoint, Adobe Acrobat, and other compatible software.
What is the typical compression ratio?
It depends on the file content. Image-heavy documents usually compress more; mostly text-based documents are already small, so the reduction is more limited.