Compress PDF
Shrink your PDF directly in your browser by tuning image quality and resolution. Your file never leaves your device.
Drop your PDF here
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How to compress a PDF
- Upload your PDF file using the drop zone or file picker.
- Set the image quality slider — a lower value creates a smaller file.
- Choose a resolution between 72, 96 and 144 DPI.
- Click Compress PDF and download the smaller file with one click.
FAQs
Are my PDF files uploaded to a server?
No. Everything runs in your browser with pdf.js and pdf-lib, so your document is never uploaded or stored anywhere.
Why doesn't the compressed PDF look identical to the original?
Compression renders every page as an image, which flattens text and can reduce sharpness, especially at low quality settings.
How much smaller will my PDF become?
It depends on the original file and your settings. Text-heavy PDFs compress well, while files full of images may not shrink as much.
Can I compress multiple PDF files at once?
This tool compresses one PDF at a time. Simply run it again for each document you want to reduce.
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Why use Compress PDF?
Use Compress PDF when a document is too big to send — for example, when you need to email a large PDF that exceeds attachment limits, or upload a file that a form or portal rejects. Compression runs entirely in your browser, so your file is never uploaded to a server.
- Email a large PDF that exceeds your mail provider's attachment limit.
- Shrink a scanned or image-heavy document so it uploads faster to portals and forms.
- Reduce file size to free up storage or make a PDF quicker to share and open.
Tips and Limits
Compression renders pages as images, so the text in the output is no longer selectable and very low quality or DPI settings can soften the look. Files are processed locally with pdf-lib and pdf.js — nothing is uploaded, and you can adjust the quality slider and resolution to balance size against sharpness.