# Compress PDF for researchers

_Updated July 2026 · Arthize · https://arthize.com/for/researchers/compress-pdf_

Arthize lets researchers and academics compress a PDF in a private workspace — free, with no watermark. 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.

## Why researchers compress a PDF

A researcher merges a paper with its appendices, extracts a results table into Excel for re-analysis, and compresses the figure-heavy submission under a journal's upload limit — privately.

**Built for papers.** Whether it's papers, datasets, appendices, Arthize's compress pdf keeps the work inside your private workspace. Unpublished work and grant applications are confidential; a private workspace keeps them out of public tools.

## What matters when you compress a 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 researchers compress a PDF for free?

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 the file is deleted after the job — which is why researchers and academics can use it for papers without a confidentiality risk.

### Is it private to compress a PDF sensitive papers?

Yes. Unpublished work and grant applications are confidential; a private workspace keeps them out of public tools. Files are processed inside your private Arthize workspace and deleted after the job.

### 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.