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Compress PDF

3 levelsBeta

Shrink PDFs by re-compressing images and dropping redundant data. Pick low, medium or high and compare sizes. Runs in your browser; no upload.

Files are not uploaded · processed in your browser

Choose a PDF file
or drop files here (files are processed locally, never uploaded)One PDF file. It is processed on your device only.
Compression level

Images at 72% quality, at most 2000 px on the long side. A good balance of quality and size.

Choose a PDF and a level, then press "Compress PDF".

How to use

  1. Choose or drop the PDF you want to compress.
  2. Pick a level: low (best quality), medium (recommended) or high (smallest file).
  3. Press “Compress PDF” and compare the size before and after.
  4. Download the result. Want it smaller? Try one level higher. Images too soft? Try one level lower.

Which PDFs shrink the most

Scans, photo-heavy documents and PDFs made from phone photos usually shrink a lot. Text-only PDFs are already small, so there is little to gain.

Privacy

Files you choose and text you enter are processed in your browser. They are not uploaded to our servers and we do not store them. Some tools download the code or data they need (such as OCR language data) from this site the first time you use them.

Read the privacy policy

FAQ

Is my PDF uploaded?

No. Parsing, image re-compression and building the new file all happen in your browser. The file never leaves your device.

What do low, medium and high do?

Low re-compresses JPEG images only, at 85% quality and at most 3000 px on the long side; it looks virtually identical. Medium uses 72% quality and 2000 px and also converts lossless (PNG-like) images to JPEG; it suits most files. High uses 55% quality and 1400 px for the smallest file.

Why did my file barely shrink?

Text-only PDFs, files whose images are already well compressed, and images in CMYK or indexed color leave little to save. If the result is not smaller than the original, the tool says so and offers the original file instead.

Will text or sharpness suffer?

Text, vector graphics and fonts are not touched, so text stays selectable and searchable. Only images are re-compressed, and higher levels make them softer. After compressing, the tool checks the page count and the text on every page and falls back to the original if anything differs.

Which images are left alone?

CMYK, indexed, Lab and other special color spaces, 1-bit and 16-bit images, transparency and image masks, and very small images are kept as they are.

Can I compress a password-protected PDF?

Remove the password first with Unlock PDF. Files up to 200 MB are supported on a computer, and up to 40 MB on a phone or tablet.

Can I compress a PDF on my phone?

Yes, it runs in your phone's browser with nothing to install, and files up to 40 MB are accepted there (200 MB on a computer). Every image in the file is decoded and re-encoded, which is the slow part, so a long document takes noticeably longer on a phone. Because a phone has less memory to work with, images above 12 megapixels — roughly an A4 page scanned above 400 dpi — are left untouched, so files like that come out less compressed.

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