Photo upload size limits, explained
Online forms limit file sizes to keep their servers and databases small and to make pages load on slow connections. The limit is usually written in kilobytes (KB) or megabytes (MB).
KB, MB and why your file is bigger than you think
A kilobyte is 1,024 bytes in most upload forms, and a megabyte is 1,024 KB. A photo straight from a phone camera is typically 2 to 5 MB, which is 100 to 250 times bigger than a 20 KB limit. The difference comes from resolution (a 12-megapixel photo has 12 million pixels) and from quality settings.
What each limit allows
| Limit | Realistic result |
|---|---|
| 20 KB | A small face photo, about 300 × 400 px, or a signature scan |
| 50 KB | A clear passport-style photo, about 600 × 600 px |
| 100 KB | A sharp portrait or a one-page document, about 1000 px wide |
| 200 to 500 KB | A detailed photo for a listing or profile |
| 1 MB | A full-width photo with fine detail |
Three rules that always help
- Crop before you compress.
- Resize to the dimensions the form asks for, if any.
- Use JPEG unless the form accepts WebP.
The compressor applies all three for you.