One tool for every upload limit
Every website seems to have its own rule: “photo under 30 KB”, “file must not exceed 150 KB”, “maximum 2 MB”. Instead of searching for a separate tool for each number, set the exact limit here. The compressor will find the best balance of quality and dimensions automatically and guarantee that the result is below your target.
KB, MB and how file size is counted
File size is measured in bytes. One kilobyte (KB) is 1,024 bytes and one megabyte (MB) is 1,024 KB. Some websites use 1,000 instead of 1,024 — the difference is only about 2%, and since our results always land slightly below the target, they pass both ways of counting.
| Use case | Typical limit |
|---|---|
| Signature scan | 10–20 KB |
| Exam / job application photo | 20–50 KB |
| Visa or passport photo upload | 50–240 KB |
| Marketplace product photo | 100–500 KB |
| Email attachment, document scan | 1–2 MB |
What affects the final quality?
Three things matter: the number of pixels, the amount of detail and the format. A close-up portrait on a plain background compresses much better than a landscape full of leaves and grass. If the result looks too soft, crop the image first or choose a slightly larger target. For websites that accept it, WebP gives noticeably better quality at the same size.
Need the opposite? If a form requires a minimum file size, use increase image size in KB.