Compress PDF to 300KB Online Free
300KB is a forgiving limit — enough headroom to keep a multi-page document genuinely readable while still fitting typical portal and email restrictions. This page opens the compressor already set to a 300KB target.
Because there is more budget to work with, scanned pages keep much more detail here than they do at 100KB or below.
Your file never leaves your browser. All processing happens on your device. Nothing is uploaded to any server.
When you need 300KB
- University and employer document uploads
- Attaching multi-page scans to email
- Portals that cap uploads at 300KB or 500KB
Other size targets
Need a different size or a quality slider instead? Use the compress pdf. New to it? read the guide.
Frequently asked questions
For text-based documents, often ten or more. For photographic scans, expect roughly two to four pages before quality visibly drops.
If the portal allows it, yes — the extra budget goes straight into image quality, so the document stays sharper and easier to read.
No. Everything runs locally in your browser.
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Every category runs free in your browser — nothing is uploaded.