Free PDF tools. Tools marked Private run in your browser, so your files never leave your device. Last reviewed November 11, 2026.
PRPreys PDFMerge PDF

Compress a PDF

Make a PDF smaller for email or upload. Choose light or strong compression.

Drop a PDF hereDrag and drop here, or

Your file stays on this device. It is processed in your browser and never uploaded.

How to compress a PDF

  1. Choose a PDF file.
  2. Pick Light to keep the text selectable, or Strong for the biggest saving.
  3. Press Compress PDF. We show how much smaller it got. If it did not shrink, keep your original.

Frequently asked questions

What is the difference between light and strong?

Light compression rewrites the file in a more compact form and keeps text and pictures exactly as they were. The saving is small, and sometimes zero. Strong compression turns each page into a picture at the quality you choose. It can cut a big scanned or picture-heavy file a lot, but the text can no longer be selected or searched.

Why did my file not get smaller?

Many PDFs are already compressed. Light compression cannot shrink them further. Try Strong if you do not need the text, or reduce the images in the program that made the file.

Is my file uploaded?

No. It is compressed inside your browser and never leaves your device.

More PDF tools

Merge PDF

Join several PDFs into one file, in the order you choose.

Split PDF

Cut a PDF into separate files by page range, or one file per page.

Rotate PDF

Turn all pages, or only the ones you pick, by 90, 180 or 270 degrees.

Delete PDF pages

See every page, mark the ones you do not need, and save a cleaner file.

Extract PDF pages

Pick the pages you want and save only those into a new PDF.

Organize PDF

Move pages into a new order, turn them, and delete the ones you do not need.

JPG to PDF

Put one or many JPG pictures into a PDF, one picture per page.

PNG to PDF

Put one or many PNG pictures into a PDF, keeping them sharp.

Images to PDF

Put JPG, PNG, WebP or GIF images into one PDF, one image per page.

PDF to JPG

Turn every page of a PDF into a JPG picture and download them together.

PDF to PNG

Turn every page of a PDF into a sharp PNG picture and download them together.

PDF to images

Turn every page into a picture. Choose JPG or PNG and the quality.

Number pages

Number every page. Pick the position, the style and the first number.

Watermark PDF

Stamp a line of text such as DRAFT or CONFIDENTIAL across every page.