Compress Image to Under 20KB Online
Reduce photos and signature scans to strictly under 20KB. Specially designed for government job forms, exam portals & passport uploads.
Drop images here, or choose files
Select multiple files. iPhone HEIC photos are automatically converted & compressed.
How to Compress & Convert Signatures & Photos to 20KB Online
Follow 3 simple steps to reduce file size directly in your browser.
Select Your Signatures & Photos to 20KB
Drag and drop your signatures & photos to 20kb files into the upload box or click to select files from your Mac, Windows, or mobile device.
Adjust Quality & Format
Fine-tune the compression quality slider or convert to WebP, JPG, or PNG. Inspect side-by-side visual quality before downloading.
Instant Free Download
Download your optimized images individually or get a single neat ZIP file. 100% private with zero file uploads to any server.
Official 20KB Specifications for Signatures & Thumb Impressions
Digital signature scans and left thumb impressions must strictly fall between 10KB and 20KB on most exam and government registration forms. Here is how to compress your signature file without broken ink lines.
| Portal / Agency | Size Requirement | Target Dimensions | Ink & Paper Standard |
|---|---|---|---|
| UPSC (NDA, CDS, Civil Services) | 10 KB – 20 KB | 140 × 60 pixels | Black ink pen on unruled white paper. Signatures in capital letters rejected. |
| GATE / JEE / NEET | 10 KB – 20 KB | 140 × 60 pixels (200 DPI) | Dark blue or black ballpoint ink. No shadows or lined background paper. |
| SSC (Staff Selection Commission) | 10 KB – 20 KB | 4.0 cm × 2.0 cm | Strict horizontal orientation. Illegible or blurred signatures disqualify application. |
| Passport Seva & NRI Portals | 10 KB – 20 KB | 200 × 100 pixels | Clear strokes centered in box; background must be clean pure white. |
Why Signatures Fail Portal Validation
Most failures occur because candidates photograph signatures with uneven room lighting, casting gray shadows across the paper. The portal validator detects high background noise, pushing the file above 20KB or flagging it as corrupted.
High-Contrast Compression in CompressPic
CompressPic selectively compresses plain white backgrounds while maintaining the sharpness of dark pen strokes. This ensures your signature reaches < 20KB while remaining 100% sharp and legally identifiable.