How to Reduce Photo Size to 20 KB or 50 KB (Phone or Computer)

By the DocEpic team · Updated 10 November 2026 · 3 min read

Scholarship portals, job sites, bank forms and school admissions all love one rule: upload a photo under 20 KB, or 50 KB, or 100 KB. A phone photo is a hundred times that. Shrinking it is easy; shrinking it so the face is still clear takes a little care. This guide explains what actually makes a photo large and how to get one to an exact size.

KB and pixels are not the same thing

Pixels are the picture's dimensions — for example 4000 × 3000 from a phone camera, or 200 × 230 for a passport-size form photo. KB is how much space the file takes. A photo can be large in pixels and small in KB if it is strongly compressed, or small in pixels but still too many KB if it is saved as PNG.

Some forms give only a KB limit, some only pixels, and exam forms usually give both. Read the instructions carefully: if they give pixel dimensions, you need to crop or resize as well as compress. For exam photos with both, the Exam Photo & Signature Resizer handles everything at once.

Reduce a photo to an exact KB size

Compress Image to KB searches for the highest quality that still fits under your limit, so you get the clearest possible photo at that size.

1. Open Compress Image to KB and add your photo — JPG, PNG, WebP or HEIC from an iPhone.
2. Choose 20, 50, 100, 200 or 500 KB, or Custom and type the number from your form.
3. Keep Reduce dimensions if needed ticked: it makes the picture slightly smaller in pixels rather than over-compressing it, which looks much better at 20 KB.
4. Keep JPG as the format unless the form asks for something else, then click Compress and download.

The photo is processed in our server's memory and released as soon as the result is sent back — it is never written to disk.

Crop first for a clearer face

At 20 KB every pixel counts. If the photo shows you from the waist up with a room behind you, most of those 20 KB are spent on the background. Crop it to your head and shoulders first with Crop Image, then compress — the face will be noticeably sharper at the same size.

JPG, PNG or WebP?

For photos, use JPG: it is accepted everywhere and compresses photos far better than PNG. PNG is meant for graphics with flat colours and is usually several times larger for a photo. WebP is smaller still, but many government and exam portals don't accept it. If you have a PNG, WebP or HEIC file and the form wants JPG, convert it with Convert to JPG or HEIC to JPG.

Why your compressed photo looks blurry

A blurry or blocky result almost always means the photo was squeezed too hard at its full size. Letting the tool reduce the dimensions fixes most of it. If you need a particular pixel size — say 200 × 230 — set it first with Resize Image and then compress, or use the exam resizer, which does both in the right order.

Also check the minimum. Some forms reject a file that is too small, such as under 10 KB, because it suggests a poor-quality picture. Pick a limit just under the maximum rather than far below it.

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