PDF ToolsCompress PDF
Compress PDF
Reduce your PDF file size without losing quality
Drag and drop your files here
or click to browse. Supports PDFs, PNG, JPG, DOCX, and more.
Private.
How it works
- 🗑️ Garbage collection — removes unused objects
- 📦 Stream compression — re-compresses internal data
- 🔗 Deduplication — merges duplicate resources
- 📐 Linearization — optimizes for web viewing
About Compress PDF
Modufile's Compress PDF tool reduces your PDF file size directly in your browser using the MuPDF rendering engine compiled to WebAssembly. It performs garbage collection, stream recompression, object deduplication, and removal of unused resources — optimizing the internal structure of the file without degrading visual quality. Since all processing happens client-side, your files are never uploaded to any server, making this a private and secure alternative to cloud-based PDF compressors like Smallpdf or Adobe's online tool. It works well for shrinking PDFs before email, upload, or archival.
Tech Stack
mupdfWASM-based PDF engine that performs garbage collection, stream compression, and structural optimization