PDF Compressor
Compress PDF by flattening pages and optimizing images.
Select PDF file to compress
Max 100MB. 100% Secure. Files never leave your device.
How to compress a PDF file online
Upload your PDF
Click the Add PDF file button and select the PDF you want to compress from your device.
Choose compression level
Select the desired compression level or quality setting based on your size and clarity requirements.
Start compression
Click the Compress PDF button and let the tool process your file in the browser.
Download the compressed file
Once processing is complete, download the optimized PDF to your device.
Frequently asked questions
Does this PDF compressor upload my file to any server?
No. All compression happens locally in your browser using WebAssembly (WASM). Your file never leaves your device, ensuring 100% privacy.
How does this tool compress a PDF?
We use the MuPDF engine to intelligently reduce the resolution of heavy images and remove unnecessary metadata, while keeping your text sharp and selectable.
What do the compression levels mean?
Recommended = Balanced quality & size. High = Smallest size (lower image quality). Lossless = Cleans metadata without affecting visual quality.
Why is the compression so fast?
Unlike standard JavaScript tools, we use compiled WebAssembly. This allows your browser to run heavy compression tasks at near-native speed.
Why does compression sometimes fail?
Common reasons include password-protected files, corrupted PDFs, or files that are already fully optimized.
Does the compressor change my file name?
Yes, the output is saved as 'compressed.pdf' (or similar) to prevent overwriting your original file by mistake.
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