How to Reduce Image Size to 20 KB — Ultra-Compression Guide

When You Need Under 20 KB

• Signature uploads for exam portals (10-20 KB range)
• Thumbnail images for email signatures
• Icons for low-bandwidth applications
• Embedded images in PDFs

Getting to 20 KB

At 20 KB, you are working with very limited data. Here is what is possible:

Dimensions	Quality 80%	Quality 60%	Quality 40%
200x200	~15 KB	~8 KB	~5 KB
300x300	~30 KB	~18 KB	~10 KB
400x400	~50 KB	~30 KB	~18 KB
140x60	~5 KB	~3 KB	~2 KB

Strategy

1. Start small — Use the smallest dimensions that meet your requirements
2. JPEG only — PNG is too large at these sizes
3. Quality 50-70% — Acceptable for small images
4. Simple content — Photos with simple backgrounds compress better
5. Remove metadata — EXIF data can be 10-50 KB alone

The Signature Problem

Signatures at 140x60 pixels often compress to only 3-5 KB. But some portals (like RRB) require minimum 30 KB. In this case, you need to increase quality or add slight padding to meet the minimum.