20 KB is the most common limit for signatures and passport-size photos on government, university and recruitment portals. If your form also states pixel dimensions, enter them below so the upload is accepted the first time.
How to use it
- Tap Choose image or drag a JPG, PNG or WEBP file into the box.
- Pick a size such as 20 KB or 50 KB, or type your own value in KB.
- If the form asks for exact pixels (for example 200 × 230), enter the width and height. Leave them empty to keep the shape.
- Press Resize image, check the preview and new size, then download the JPG.
Why online forms ask for a size in KB
Application portals limit file sizes so that thousands of uploads do not overload their servers. That is why exam boards, universities, job portals and visa sites often say things like "photo under 50 KB" or "signature between 10 KB and 20 KB". A phone camera photo is usually 2–5 MB, so it has to be made 50 to 200 times smaller before it is accepted.
How this resizer keeps your photo clear
Most tools simply shrink the picture until it fits, which makes faces blurry. This tool first keeps your pixel size and lowers the JPEG quality step by step, testing each result, and picks the highest quality that is still under your limit. Only if that is not enough does it reduce the width and height a little at a time. The result is the sharpest photo that fits the rule.
Common size requirements
- Signature: 10–20 KB, often around 140 × 60 pixels.
- Passport-size photo: 20–50 KB, often around 200 × 230 pixels.
- Scanned document: 100–300 KB.
Always follow the exact numbers on your own form. They differ between organisations.
Popular sizes
Frequently asked questions
Will my image be exactly 20 KB?
It will be as close as possible while staying under 20 KB, because most forms reject files that are even 1 KB over the limit. Typical results land between 17 and 20 KB.
Is my photo uploaded to a server?
No. The image is resized by your browser using JavaScript. It never leaves your phone or computer, so it is safe for ID photos, signatures and documents.
Why is the output a JPG?
JPG gives the smallest files for photos, and almost every online application form accepts it. Transparent areas of a PNG become white.
How do I resize a signature to 10–20 KB?
Crop the signature tightly first, then set the target to 20 KB (or 10 KB) and, if the form asks, a size like 140 × 60 pixels. Signatures are simple images, so they stay sharp even at small sizes.
Can I make an image bigger in KB?
This tool reduces size. If a form requires a minimum size, use a larger target and set bigger pixel dimensions; a larger picture naturally has a larger file size.
Does it work on iPhone and Android?
Yes. It works in Safari, Chrome and other modern mobile browsers without installing an app.
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