Compress
Reduce a PDF's size
Reduce PDF file size without losing quality, free and with no installation. Compression runs entirely in your browser — your files stay private.
- Files processed on your device
- No file size limit
- 100% free
How to compress a PDF
- 1Drop the PDF you want to shrink into the tool: the file stays on your device and compression runs entirely inside your browser, with no upload.
- 2Optionally enable metadata removal (title, author, subject, keywords) to save a few extra kilobytes and strengthen the confidentiality of your document.
- 3Run the lossless optimization: the PDF's internal structure is rewritten and compacted (typical savings of 5–30%), then download your smaller file.
Frequently asked questions
Does compression reduce quality?
No. The optimization is fully lossless: it compacts the file's internal structure (xref table, object streams, merged duplicates) without touching images or fonts. The compressed PDF looks strictly identical to the original.
Do my documents stay private?
Yes. Compression runs 100% in your browser via WebAssembly: nothing is sent to a server, stored in a cloud or logged. You can also enable metadata removal (title, author, keywords) to anonymise the document before sharing it.
How much smaller will it get?
Typical structural savings range from 5 to 30% depending on the file. PDFs produced by older software or edited many times compress best; an already-optimized PDF will barely change. The tool shows the exact savings in bytes and percent after processing.
Is there a file size limit?
No, none. Unlike online services that often cap free files at a few MB, you can optimize very large PDFs: all processing is local, so only your device's memory matters.