How to compress an image to 20 KB
- Add your photo or signature (JPG, PNG, WebP or iPhone HEIC). The 20 KB target is already set.
- Optional: type a max width such as 300 if the form also asks for specific pixel dimensions.
- Click Compress images and download the result. The summary confirms it is under 20 KB.
Who needs images under 20 KB?
Very small limits like 10–20 KB are typical for the signature upload and sometimes the applicant photo on recruitment, exam and government application portals. These forms often also ask for a specific width and height, so check the instructions before you compress.
Getting a clear result at 20 KB
20 KB only holds a small image, so the tool lowers the JPG quality first and then the dimensions until it fits. For a passport-style photo that means roughly 200–350 pixels wide; a signature can be wider because it has fewer details.
| Image | Typical size that fits in 20 KB |
|---|---|
| Signature on white paper | 500–700 px wide |
| Face photo, plain background | 250–350 px wide |
| Busy photo (outdoor, patterned) | 180–250 px wide |
Tips for signatures and photos
- Sign with a dark pen on plain white paper and photograph it in daylight; crop tightly around the signature.
- Use a plain, light background for face photos: it takes fewer bytes and looks cleaner.
- Need exact pixel dimensions? Set them first with Resize Image, then compress here.
- Slightly larger limit? Try 50 KB.
Frequently asked questions
Why is my PNG converted to JPG?
PNG is lossless and cannot reach very small sizes for photos. When you set a target size the tool saves a JPG, which most forms prefer anyway.
Can I convert an iPhone HEIC photo?
Yes. HEIC photos are opened in your browser and saved as a JPG under 20 KB.
Is my photo uploaded?
No. Compression happens on your device; we never see your photo or signature.
Other sizes
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Last reviewed: 2026-11-10. Tools are provided as-is. Keep a copy of important originals. See our disclaimer.