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OZO Compress PDF

Compress PDF

Make a PDF smaller with low, medium or high compression. See the size before and after, then download. Your file stays on your device.

  • Free forever
  • No signup
  • Made in your browser

How to make a PDF smaller

  1. 1

    Add your PDF

    Choose a PDF or drop it on the box. It opens in your browser and is never uploaded.

  2. 2

    Pick a compression level

    Low keeps the best quality, Medium suits most files, and High gives the smallest file with softer images.

  3. 3

    Compress and compare

    Press Compress, check the size before and after, then download the smaller PDF.

Get a PDF under the email limit

Many email services and job or visa portals refuse files over 10 or 25 MB. A scanned contract or a brochure full of photos is easily bigger than that. Shrinking its images usually cuts the size by half or more without changing a word.

Good to know

  • Always compare. The result shows the size before and after, so you can try another level if you are not happy.
  • Your original is safe. You download a new file and the one you chose stays as it was.
  • Joined files first. Combine documents with Merge PDF and then compress the result.
  • Only need some pages? Take them out with Split PDF.
  • Resizing loose pictures? Use the image resizer.

Frequently asked questions

How does it make a PDF smaller?

Most of the weight in a big PDF is photos and scans. This tool finds those images, shrinks them to a sensible size and saves them at a lower quality. Text and drawings are not touched, so they stay sharp.

Why did my PDF not get smaller?

If the file is mostly text, or its images are already small, there is little to save, and the tool tells you so rather than giving you a bigger or identical file. Try the High setting. A file that was saved as pages of pictures may also be hard to shrink further.

Which level should I choose?

Medium is a good start for email and uploads. Use Low for documents you will print, and High when the size limit matters more than how crisp the pictures look.

Will it change my text or links?

No. Only the images are replaced. Text, fonts, links and the page layout stay exactly as they were.

Is my PDF uploaded to compress it?

No. The images are shrunk by your own browser, on your device, so the file never goes to a server.

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