On-Device Optimization Matrix
Compress PDF lossless
Ultra-fast in-browser Portable Document Format optimizer powered by WebAssembly and native GPU acceleration.
100% Private (0 Bytes Uploaded)
WebAssembly Engine
Calibrated for PDF
Online PDF Compressor
Supports JPEG, PNG, WebP, AVIF, HEIC, MP4, MOV, PDF, and SVG. 100% on-device.
Drop images, videos, PDFs, or SVGs here
or browse files from your computer
JPG / PNG / WEBPMP4 / MOVPDFSVGHEIC
Technical Specification
File Type:PDF (Portable Document Format)
Typical Reduction:60% - 85% file size cut
Color Space Preservation:sRGB / Display P3 color gamut preserved
Processing Engine:pdf-lib Stream Pack
Batch Support:Yes, unlimited concurrent items
Key Capabilities
- Specialized PDF on-device optimization
- Hardware-accelerated processing
- Real-time before/after visual difference slider
- Instant ZIP packaging for high-volume batches
Complies with international photographic compression standards (ISO/IEC 10918-1) and web asset delivery guidelines.
Knowledge Base
Frequently Asked Questions: Compress PDF lossless
Everything you need to know about our private on-device compression engine.
For PDF, our engine optimizes internal stream tables, strips redundant metadata, applies perceptual quantization, and preserves essential visual structures.