# Compress a PDF to 400 KB

> Compress a PDF under 400 KB in your browser. Pre-set to a safe 390 KB target. Lossless first, then readable raster passes only if needed.

Canonical: https://mypdf.space/compress-pdf/400kb
Last updated: 2026-10-26

## Answer

Use the compressor below, pre-set to 390 KB so the result passes a 400 KB limit either way. **About three to five pages** stay sharp; **around twelve plain pages** usually fit at the lowest setting.

## What fits comfortably

Three to five pages at good quality, or a short text report unchanged.

## What is squeezed

Around twelve plain pages at the lowest setting.

## Context

400 KB appears on some exam and job portals that sit between 300 KB and 500 KB caps.

Merged mark sheets or a short multi-page scan often land here after a single Target size pass.

## Tips

- **Delete pages the form does not ask for** before compressing.
- **Prefer digital PDFs** over photographing printouts when you have them.
- **Check the preview** on seals and handwritten marks.

## FAQ

### How do I compress a PDF to 400 KB?

Open this page, drop the file, and press Compress. The tool is already set to 390 KB.

### Why is the target 390 KB?

To stay under 400,000 bytes whether the portal counts 1 KB as 1,000 or 1,024 bytes.

### Does compression upload my file?

No. It runs in your browser.

## Related

- [Compress PDF hub](https://mypdf.space/compress-pdf)
- [Compress tool](https://mypdf.space/tools/compress)