Compress PDF online

Compress PDF files online for free and shrink the file size of any PDF directly in your browser. This PDF compressor re-renders each page and re-encodes it as a JPEG image, so scan-heavy and image-rich documents get much smaller and become easy to email, upload, or archive. Pick a compression level — low for the best quality, medium for a balanced result, or high for the smallest file — then download your reduced PDF in seconds. Everything happens 100% in your browser: your PDF is never uploaded to a server and nothing leaves your device, so your documents stay completely private. There is no sign-up, no watermark, and no software to install.

🔒 100% private — files never leave your device

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How to use

  1. Drag and drop your PDF into the box, or click to select a PDF file from your device.
  2. Choose a compression level — low (best quality), medium (balanced), or high (smallest file size).
  3. Click Compress and let the tool re-render and re-encode every page right in your browser.
  4. Download your compressed PDF and see exactly how many KB or MB you saved.

Frequently asked questions

Is my PDF uploaded to a server?

No. This PDF compressor runs 100% in your browser. Your file is processed locally on your device and is never uploaded, so your documents stay completely private.

How much smaller will my PDF get?

It depends on the content and the level you pick. Image-heavy and scanned PDFs shrink the most; the tool shows the exact before/after size and the percentage saved after compressing.

What do the low, medium, and high levels mean?

Low keeps the best image quality with the least size reduction, medium is a balanced default, and high produces the smallest file with the strongest compression. Higher compression means lower image quality.

Will the text in my PDF still be selectable after compressing?

No. Each page is re-rendered into a JPEG image, so text becomes part of the image and is no longer selectable or searchable. This is what makes scan-heavy PDFs much smaller.

Is there a file size limit?

There is no fixed limit, but because compression happens in your browser, very large PDFs use your device's memory and may take longer or be limited by available RAM, especially on phones.

Do I need to install software or sign up?

No. The PDF compressor is free, works in any modern browser, and requires no installation, account, or watermark.

About this tool

Shrink large PDF files by down-sampling and re-compressing embedded images. Make PDFs small enough to email, without uploading them anywhere.

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