By ExamPhotoTool.app · Updated · 7 min read
Quick answer
To get a photo under 20KB, first reduce its pixel dimensions to a small portrait size, crop tightly to head and shoulders, use a plain background, then set the target at 20 KB and download as JPG. Check the result in your file manager, and keep the original for retries.
Why is a 20KB photo limit so hard to meet?
Twenty kilobytes is about one hundredth of a normal phone photo. To get there you must throw away most of the data, and that is fine for a small exam-form photo, but the method matters. If you only slam the quality slider down, you get blocky skin and smeared eyes. If you first shrink the pixel dimensions and use a plain background, the same 20 KB looks noticeably better.
What is the best way to reach 20KB?
- Begin with the original, uncompressed photo, not a chat-app copy.
- Open the Photo Resizer and load the file. It is processed in your browser and not uploaded.
- Set the pixel size to the number in your notice. If none is given, use a small portrait size of a few hundred pixels tall.
- Set the maximum to 20 KB (and the minimum too if the form has one).
- Zoom into the preview. Check the eyes and hairline.
- Download and confirm the size.
How do pixel size and KB size relate at 20KB?
| Pixel size (example) | Difficulty at 20 KB | Comment |
|---|---|---|
| Very large (1000+ px wide) | Very hard | Heavy quality loss needed |
| Medium (400-600 px) | Moderate | Visible softness |
| Small (100-250 px) | Easy | Best match for small form photos |
These are general patterns, not exam rules. Your form's own notice decides the pixel size. When it gives one, follow it exactly. When it gives only a KB limit, choose the smaller size and you will preserve more clarity at 20 KB.
How do I keep the face clear at 20KB?
- Use a plain, light background. Flat areas cost almost nothing to store.
- Take the photo in even daylight, facing the light, so there are no harsh shadows.
- Crop to head and shoulders so the face fills the frame.
- Never enlarge a small image to reach a bigger pixel size. It adds blur without adding detail.
- Avoid patterned clothing and detailed backgrounds, which use up your KB budget.
What if my form has a minimum as well as a maximum?
Some forms set both, for example a low minimum and a 20 KB or 50 KB upper limit. Your file must sit inside the range. A file that is far below the minimum can be rejected as unclear. Aim for the upper part of a tight range, within a couple of KB of the maximum. If your upper limit is 50 KB instead, read the 50KB guide.
Why does my exam site say the file is too large after I resized?
Check three things. First, confirm the real size in your file manager rather than trusting a preview. Second, make sure the file you upload is the resized one, not the original with a similar name. Third, some sites count size with a different convention, so leave a margin of a KB or two below the limit. If problems continue, see photo rejected in exam form: reasons and fixes.
Can I do this on my phone?
Yes. Open the tool in your phone browser, select the photo from the gallery, set the values, and download. It needs no account. Since nothing is uploaded, your face photo stays on your phone. The tool is free; watermark-free downloads are a paid option.
Does the format matter at this size?
Yes. JPG is the format designed for photographs and gives the smallest files at a given look. A PNG of the same photo can be many times larger. If your photo is PNG, convert it first. The guide on converting a photo to JPG explains how.
Final checks for a 20KB photo
- The file is well under 20 KB but above any stated minimum.
- Format is JPG.
- Face is sharp enough to recognise at actual size, not just zoomed.
- You have the original saved.
Frequently asked questions
Can a photo really look good at 20KB?
Yes, if the pixel dimensions are small and the background is plain. A small portrait can be clear at 20 KB, whereas a large photo squeezed to 20 KB will look poor.
Should I reduce dimensions or quality first?
Reduce dimensions first, to the size the form asks for. Then let quality drop only as much as needed to hit the KB target.
What if the photo goes below the minimum size?
Increase the target size slightly or use a larger pixel size so the file lands inside the range on the notice.
Is my photo uploaded anywhere?
No. Everything runs in your browser, and the tool is free with no sign-up.
Is there a watermark?
Free use is available; watermark-free downloads are a paid option. Check the download screen for what applies.