The 'lossless' mode repacks the file structure. The 'strong' mode additionally rasterises pages at a reduced DPI and JPEG quality you control — best for scan-heavy PDFs.
Compress a PDF
Shrink file size with object-stream packing and optional image downscaling.
Compress a PDF: Shrink file size with object-stream packing and optional image downscaling. Add your file to the tool above, apply it, and download the result — free, in any browser, with no sign-up.
- 100% free — no sign-up
- Files processed privately
- Fast — no upload wait
- No file-count limit
About this tool
How to use Compress PDF
1. Add your file
Drop your file onto the Compress PDF workspace above, or click to browse for it.2. Choose the options
Adjust the settings for compress pdf — the defaults work for most files.3. Download the result
The result is generated in your browser — nothing is uploaded. Click Download to save it.
Frequently asked questions
Is Compress PDF free to use?
Yes. Compress PDF is completely free with no watermark, no account, and no file-count limit.
Are my files uploaded to a server?
No. Processing happens in your browser using WebAssembly and the Canvas API. Your documents never leave your device.
Which browsers are supported?
Any modern browser — Chrome, Edge, Firefox, or Safari. No extension or desktop app is required.
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