# How do I compress a PDF?

_Updated July 2026 · Arthize · https://arthize.com/answers/how-to-compress-pdf_

Compressing a PDF reduces file size — often 50–90% on image-heavy scans — by down-sampling images and stripping redundant data, while keeping text selectable. In Arthize you open the compress tool, then add your pdf, then pick a compression level, then download the smaller file, and download the result — free, with no watermark.

## Answer

Compressing a PDF reduces file size — often 50–90% on image-heavy scans — by down-sampling images and stripping redundant data, while keeping text selectable. In Arthize you open the compress tool, then add your pdf, then pick a compression level, then download the smaller file, and download the result — free, with no watermark.

## More about compress pdf

PDF file size almost always comes from embedded images, not text.

Down-sampling scans to a lower DPI usually gets an image-heavy file under 1MB.

Light compression is visually lossless for most documents.

## How to compress a PDF

1. **Open the compress tool** — Sign in and open the Compress tool.
2. **Add your PDF** — Upload the oversized file; it is processed privately.
3. **Pick a compression level** — Higher compression down-samples images more; light compression keeps them crisp.
4. **Download the smaller file** — Most image-heavy PDFs drop well under 1MB with no visible quality loss.

## FAQ

### How do I compress a PDF to under 1MB?

Compressing a PDF reduces file size — often 50–90% on image-heavy scans — by down-sampling images and stripping redundant data, while keeping text selectable. On Arthize it's free with no watermark and processed privately.

### Will compressing a PDF lose quality?

Compressing a PDF reduces file size — often 50–90% on image-heavy scans — by down-sampling images and stripping redundant data, while keeping text selectable. On Arthize it's free with no watermark and processed privately.

### How do I reduce PDF file size for email?

Compressing a PDF reduces file size — often 50–90% on image-heavy scans — by down-sampling images and stripping redundant data, while keeping text selectable. On Arthize it's free with no watermark and processed privately.