How to reduce an image to 20 KB

20 KB is about 1/200th of a phone photo. It is typical for signature uploads and older portals. You can get there with readable results, but only if the pixel size is small.

Realistic targets

• Signature: crop tightly, about 300–500 px wide. Black ink on white compresses extremely well.
• Photo: about 200–300 px wide. Faces are still clear at this size on a form.
• Documents: 20 KB is usually too small for readable text; check whether the form really means 200 KB.

Steps

1. Crop to just the signature or face.
2. In the compressor, tap 20 KB. Optionally set Max width to 300 (photo) or 450 (signature).
3. If you see "could not reach target", lower Max width further.

Tips for signatures

Sign with a dark pen on plain white paper, photograph in daylight without shadows, and crop close. Grey paper texture and shadows add noise, and noise is what eats file size.