Compress PDF to 500KB Online
Reduce a large scanned PDF to 500KB while keeping text clear. Good for long documents, application bundles, and email attachments.
If your PDF is already under 500KB, you do not need to compress it.
Where a 500KB limit comes up
University admissions, visa applications, and some recruitment portals allow 500KB for supporting documents. It also keeps email attachments small enough for slow connections.
With 500KB, even a 15–20 page scan keeps about 25–35KB per page. Short documents stay close to the original appearance.
Approximate size per page at 500KB
| Pages | Approx. KB per page | Readability |
|---|---|---|
| 1–5 | 100–500KB | Excellent |
| 6–15 | 33–83KB | Good |
| 16–25 | 20–31KB | Fair — check small text |
How to use it
- Choose your PDF (up to 50MB).
- Keep 500KB selected, or pick another size.
- Press Compress and wait for all pages to finish.
- Check the new size and download.
Getting the best result
- Scans from phone apps are often 5–20MB — compression works well on them.
- Very long PDFs take longer on older phones; keep the tab open.
- Remove pages you do not need to submit.
- Check the official instructions for the exact size and format.
Frequently asked questions
How do I compress a PDF to 500KB?
Upload it, keep the 500KB target, press Compress, and download once it is under 500KB.
Will my PDF look worse?
At 500KB most documents look almost the same, and text usually stays selectable because only embedded images are compressed.
Can I compress a 10MB or 20MB PDF?
Yes, files up to 50MB can be compressed in the browser.
What if the result is still over 500KB?
Remove unneeded pages, or split the document if the portal accepts several files.
Is my PDF uploaded?
No. It is processed on your device.
Does it work on mobile?
Yes, on Android and iPhone browsers.
Related tools
Strict certificate and marksheet limits.
Compress PDF to 200KB →Multi-page documents with a 200KB cap.
Compress PDF to 300KB →Longer scans and combined documents.
Compress PDF (custom size) →Choose any target size.
JPG to PDF →Turn photos or scans into a PDF with a KB limit.
Merge PDF →Combine several PDFs and images into one file.
PDF to JPG →Portal wants JPG? Convert pages to images.
Helpful guides
- How to Compress a PDF for an Online Application — Why certificate PDFs are too large, how to get them under 100KB, 200KB or 500KB, and how to keep the text readable when a portal has a strict limit.
- How to Scan Documents With Your Phone for Government Forms — Get clean, readable, small scans of certificates, ID cards and marksheets using only your phone — lighting, framing, cropping and file-size tips.