Compress PDF
Make a PDF smaller in two ways: a lossless clean-up that keeps text selectable, or strong compression that converts each page to an optimised image. Your file is processed locally.
Your files never leave your device.
Good to know: Browsers cannot re-compress images inside a PDF while keeping its text layer. “Strong” mode therefore turns each page into a JPG image — ideal for scans, but text will no longer be selectable or searchable.
How to use the Compress PDF
- 1Choose a PDF file.
- 2Pick “Lossless” to keep everything intact, or “Strong” and a quality level for scanned documents.
- 3Click “Compress” and compare the sizes before downloading.
What is the Compress PDF?
PDF size is usually dominated by embedded images. Lossless mode rewrites the file structure more compactly (object streams), which helps most for PDFs exported by some office tools. Strong mode re-renders every page at a chosen resolution and JPG quality, which can shrink scanned documents dramatically.
Frequently asked questions
Why did lossless mode barely reduce the size?
The PDF is already well optimised, or most of its size comes from images. Try Strong mode for scanned documents.
Will Strong mode keep my text searchable?
No — pages become images. Keep the original if you need to search or copy the text.
Is the Compress PDF free and private?
Yes. The Compress PDF is free, needs no account, and processes your files entirely in your browser. Files are never uploaded to a server or stored.