How to Compress a PDF to 300KB (Free, Browser-Based, 2026)
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Quick Answer
To compress a PDF to 300KB: upload to FileCurve PDF Compressor, pick "High" compression. A 2–5MB scanned PDF reaches 250–400KB. Enable grayscale if needed for the last push under 300KB.
Step-by-step
- 1
Upload PDF to FileCurve PDF Compressor.
- 2
Pick "High" compression.
- 3
Check output — most PDFs hit 250–400KB.
- 4
If above 300KB, enable grayscale or switch to Maximum.
- 5
Download.
Expected output
Format
PDF, images at 100dpi
Quality setting
High compression
Estimated size
5–10% of original
Why you might need this
- →Scholarship application document uploads
- →Government portal with 300KB caps
- →Tight email attachments
Troubleshooting
PDF with diagrams looks blurry
Diagrams suffer at high compression. Use Medium + grayscale if diagrams must stay sharp.
Frequently asked questions
Difference between 200KB and 300KB compression?
Minimal visual difference — both use downsampling. 300KB keeps marginally better image quality.