CompressTo20KB vs ImageResizer
ImageResizer cannot compress to exact KB and uploads your files to a server. Here is the full comparison.
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CompressTo20KB wins — privacy & exact KB
Zero upload · Exact KB Mode · USCIS preset · 100% free
| Feature | CompressTo20KB | ImageResizer |
|---|---|---|
| File Upload to Server | ❌ Never — 100% browser | ✅ Uploads to server |
| Exact KB Target (20KB, 50KB) | ✅ Yes — Exact KB Mode | ❌ No |
| Gov / Passport Photo Preset | ✅ USCIS, DS-160 | ❌ No |
| Shopify / Amazon / Etsy Preset | ✅ Yes | ❌ No |
| HEIC iPhone Support | ✅ Yes | ⚠️ Limited |
| AVIF Output | ✅ Yes | ❌ No |
| Batch (up to 50 free) | ✅ Yes | ⚠️ Limited |
| Price | ✅ 100% Free | ⚠️ Free tier limits |
Frequently Asked Questions
Can ImageResizer compress to exactly 20KB?
No. ImageResizer does not support exact KB targeting. CompressTo20KB is the only free tool with Exact KB Mode that hits a precise file size like 20KB, 50KB, or 100KB.
Does ImageResizer upload files to a server?
Yes. ImageResizer processes images server-side. CompressTo20KB runs entirely in your browser — no upload, no server, no data retention.
Which is better for passport photo compression?
CompressTo20KB. It includes a Gov 20KB preset designed for USCIS, DS-160, and US passport requirements. ImageResizer has no such preset.