Compress Image to 20 KB — Resize Photo to 20 KB Online

Where a 20 KB limit shows up

• Photo fields specifying a 20 KB maximum
• Forms asking for a 10–20 KB or 20–50 KB file

Tips for a clean 20 KB file

• •20 KB is enough for a clear passport-style photo if the background is plain.
• •Shoot in daylight facing a window — good light means less noise, and less noise compresses better.
• •Check your form's pixel size. If it differs from 300×400 px, tick "Keep original dimensions" and crop the photo to the required size first.
• •If your form also sets a minimum (for example 10–20 KB), check the downloaded size is above it before uploading.

Frequently asked questions

How do I compress a photo to 20 KB?

Upload the image above. The tool resizes to 300×400 px and automatically lowers JPEG quality until the file is under 20 KB — no slider or trial and error.

What is 20 KB photo size in pixels?

KB is file size, not pixel size, so there is no fixed conversion. This page outputs 300×400 px. Always use the pixel size your form states.

How do I compress an image to 20 KB without changing its width and height?

Tick "Keep original dimensions" before choosing your file. The whole image is kept and only compressed, scaling down only if needed to fit under 20 KB.

How do I resize a signature to 10–20 KB?

Use the 10–20 KB signature tool, which keeps the signature's wide shape instead of cropping it to a photo frame.

My form asks for 20 KB to 50 KB. Which tool should I use?

Use the 50 KB tool, then check the downloaded file is at least 20 KB. If it is smaller, start from a clearer, larger original photo.

Which forms need a 20 KB photo?

Use this tool when your form explicitly allows a photo up to 20 KB. SSC CGL 2026 instead requires live photo capture in its application.

Is my image uploaded to a server?

No. ShantiTools compresses the image entirely inside your browser — the file never leaves your device.

Common mistakes

• •Uploading a screenshot — screenshots are already compressed and often produce blocky JPEGs. Use the original photo instead.
• •Ignoring dimensions — a file can be the right KB but the wrong shape. This page sets 300×400 px automatically.
• •Cropping too tightly — leave a small margin around the head and shoulders so the form does not cut the face.
• •Wrong background — busy backgrounds eat KB and can get rejected. Plain white or light works best.

Troubleshooting

The result is still too big

Start with a smaller source file or crop closer to the face. If the form allows a smaller size, try 15 KB.

The result is too small

The source image may be very low resolution. Upload a larger original photo and retry.

My form rejected the upload

Double-check both the KB limit and the pixel dimensions in the form. Some forms also require exact aspect ratios (e.g. 3.5×4.5 cm).

Other sizes