clairpdf.
Free · No signup · No software to install

Compress PDF online

Make a scanned PDF smaller and check its readability before downloading.

1Choose my files2Preview3Download

PDF: 30 MB/file, 80 MB total, 120 pages. Images: 20 MB/file, 24 MP, 20 files.

Automatic processing · light on device, heavy on server

PDF compression for scans: pages become images. Selectable text, links and forms are lost. Check readability before use.

When should you use this tool?

A large scanned PDF may exceed an email or upload limit. This compressor renders pages as images and adjusts resolution and quality. It is best suited to scans where readable appearance matters more than selectable text or interactive fields.

How to get your result

Start with a moderate quality setting, create the result and compare its size. Zoom in on small text before sending it. An already compact PDF can become larger after rendering. Save the original so you can restore higher quality if needed.

Prepare a PDF to send: the checklist

Choose · Adjust · Download

How it works

  1. 01

    Choose my files

    Automatic processing · light on device, heavy on server

  2. 02

    Preview

    Make a scanned PDF smaller and check its readability before downloading.

  3. 03

    Download

    PDFs and images without the hassle. Choose your files, adjust if needed and download the result. Free, no account, on phone, tablet and computer.

A question?

Does compression keep selectable text?

No. Pages become images, so selectable text, links and interactive forms are lost. A smaller file size is not guaranteed.

Are my files uploaded?

Light tasks stay in your browser. Heavy tasks, or local processing lasting over eight seconds, automatically use the server when available. Temporary files are deleted after processing or failure. No account needed.

Good to know

PDF compression for scans: pages become images. Selectable text, links and forms are lost. Check readability before use.