Compress PDF
Reduce PDF file size with a quality choice.
Click to upload or drag & drop
Select a PDF file
How to use the Compress PDF
- 1Upload your PDF
Drag and drop or click to select the PDF you want to compress.
- 2Pick a compression level
Choose screen for the smallest file or a higher level to keep more quality.
- 3Compress
Click Compress PDF and our server optimises it with Ghostscript.
- 4Download
The smaller PDF downloads automatically.
Compress a PDF online
This PDF compressor reduces the file size of a PDF by optimising and down-sampling its images, using Ghostscript on our server. Pick a compression level to balance size against quality — perfect for getting under an email or upload limit.
When to use it
- Shrink a PDF to fit an email attachment limit.
- Reduce a scanned document before uploading it.
- Make a heavy, image-rich PDF quicker to share.
Private & secure
Your file is uploaded over an encrypted HTTPS connection, converted on our server and streamed straight back to your device. Each request runs in its own isolated workspace that is deleted the instant the result is returned, so nothing is ever stored or shared.
Frequently Asked Questions
How much smaller will my PDF get?
It depends on the file. Image-heavy and scanned PDFs shrink a lot; PDFs that are mostly text are already small and change less. The 'screen' level compresses hardest.
What do the levels mean?
screen is the smallest (72 dpi images), ebook is a balanced default (150 dpi), printer and prepress keep higher image quality (300 dpi) for a larger file.
Are my files uploaded to a server?
Yes. Unlike our browser-based tools, the Compress PDF runs on our secure server because it needs professional desktop-grade software to do the job well. Your file is processed in an isolated workspace and deleted automatically the moment the result is sent back — nothing is stored, logged or shared.
Is it free? Is there a watermark or size limit?
It is completely free with no sign-up and no watermark. Files up to 100 MB are supported per conversion.