How to reduce a photo to 20 KB, 50 KB or 100 KB for online forms
Last checked: 14 November 2026
Resize a photo to KBJob portals, exam boards and visa forms often have strict upload limits, such as “photo under 50 KB” or “signature under 20 KB”. A phone photo is usually 2 to 5 MB, which is 50 to 100 times too big.
The quick way
- 1Open the Resize Image to KB tool and upload your photo. HEIC photos from iPhones work too.
- 2Type the limit from your form, for example 50 KB. If the form also gives a size in pixels (like 300 × 300), enter that as well.
- 3Download the result. It's the best quality that fits under your limit, saved as a JPG.
Why the photo gets smaller
File size depends on two things: the number of pixels, and how strongly the JPG is compressed. We first try higher compression, and only reduce the pixel size if that isn't enough. That keeps faces sharp at small sizes.
| Limit | Typical use | Usual result |
|---|---|---|
| 10–20 KB | Signatures, thumb impressions | About 300 × 80 px for a signature |
| 50 KB | Job and exam application photos | About 400–600 px wide, clear face |
| 100–200 KB | Visa and ID applications | Close to full quality for a portrait |
Tips for forms
- If the form says “between 20 and 50 KB”, aim for about 45 KB, not the minimum.
- For a signature, sign in black or blue ink on plain white paper and take the photo in good light.
- If the form asks for exact pixel dimensions, use the width and height boxes. The photo is cropped from the centre to fit.
Ready? It's free and takes a few seconds.
Resize a photo to KB