Local WASM engine
Compression logic runs in your browser sandbox with WebAssembly performance.
Local compression
Low, medium, high modesBrowser-based compression50MB per fileCompress PDF files in your browser.
Reduce file size while keeping the document readable. No upload step for standard workflows. Choose the level and export.
- Input
- One PDF
- Runtime
- Browser tab
- Output
- Optimized PDF
Drop a PDF to compress
Inspect the document, choose an optimization level, then compare before and after file size.
Local processing · up to 50MB per file
How to use Compress PDF
- 01
Choose a PDF
Select the PDF you want to optimize. The file is analyzed locally to identify compression opportunities.
- 02
Choose a level
Select Low for higher quality, Medium for balance, or High for stronger size reduction.
- 03
Download optimized file
Compression runs in your browser session and the optimized PDF is prepared for local download.
Compression should feel like controlled output prep, not a mystery shrink button.
Object stream compression
The engine restructures PDF object streams and removes redundant data to reduce file size.
Metadata and asset cleanup
Hidden metadata, thumbnails, and other overhead can be reduced without changing document purpose.
Local export pipeline
Optimization runs in your browser session, and the compressed file is generated locally for download.
Privacy first
Many tools require file upload before optimization. DocuStitch is designed for local-first compression in your browser session.
Instant start
Compression starts as soon as you select a file, using your device resources.
Browser sandbox
The compression engine runs in an isolated browser context to keep the workflow tied to your current session.
PDF size reduction without a separate upload step
Reducing PDF size helps with email sharing, upload limits, and storage management. Many compressors require uploading files to remote servers before optimization. DocuStitch removes that step for standard workflows.
The tool uses WebAssembly (WASM) to perform compression logic in your browser session. It analyzes structure, removes redundant data, and optimizes content using local CPU resources.
Choose Low for higher visual fidelity, Medium for balance, and High for stronger file-size reduction.
Privacy focused
For standard workflows, no file upload step is required.
Smart optimization
Removes redundant objects and trims excess overhead while preserving document purpose.
Fast results
Processing starts immediately, without waiting for raw file uploads.
Frequently asked questions about Compress PDF
Will images look blurry after compression?
It depends on the level you choose. Lower levels preserve more quality, while higher levels prioritize smaller size.
Is there a file size limit?
Practical limits depend on your device resources because processing happens locally.
How is this different from other online tools?
Many tools upload your file first. DocuStitch is designed to run standard workflows locally in your browser.
Does it work on mobile phones?
Yes, on modern mobile browsers that support the required web platform features.