Scanned signatures
Many exam, scholarship or government forms ask for your signature as a very small image. Dark ink on white paper fits with good sharpness.
FREE TOOL · PRESET READY
Compress image to 20 KB
The 20 KB target, JPG output and an 800 px maximum width are already selected. 20 KB is very little space: the tool finds the best quality that fits and shrinks the dimensions if needed. It works best with signatures, face photos and plain backgrounds.
- Free, no watermark
- 20 KB target pre-selected
- Your files never leave your device
HOW TO DO IT
Three steps.
Add the image
A photo or a scanned signature in JPG, PNG or WebP. Up to 10 at once.
Keep the preset
20 KB, JPG and 800 px come pre-selected. If exact dimensions are required, set them first with Resize image.
Download
Check the final size next to each file and download it, or all of them in a ZIP.
WHEN TO USE IT
What 20 KB is asked for
ID-style photos
A face photo on a plain background is among what compresses best: at 20 KB it is still easy to recognise on screen.
Why 800 px
Not many pixels fit in 20 KB at good quality. 800 px wide is a sensible starting point; the tool reduces it further if needed.
REAL LIMITS
How to get the most out of it
Crop what you do not need
Keep only the signature or the face with Crop image: empty borders take space too, and removing them leaves more quality for what matters.
Very detailed photos
A landscape or a group photo will not fit in 20 KB without losing a lot of sharpness: it is normal for the tool to shrink the dimensions considerably.
Leave a margin
The tool counts 1 KB as 1024 bytes. If a form counts 1000 and rejects it by a little, ask for 19 KB.
THREE TARGETS
100, 50 or 20 KB: which one you need
Compress image to 20 KB: common questions
How do I compress a signature to 20 KB?
Scan it or photograph it in good light, crop the edges and add it here: 20 KB, JPG and 800 px are already selected. Press “Compress image” and download it.
Can I go below 20 KB?
Yes. Enter another number in “Maximum size per image (KB)”: the minimum is 10 KB.
Why did my photo change size?
Because the preset starts from an 800 px maximum width: a wider photo is reduced to 800 px from the start. If it still does not fit in 20 KB, the tool tries up to 6 progressively smaller sizes and tells you the final dimensions.
What if the form asks for PNG?
This tool saves JPG or WebP, the formats that shrink the most (WebP only if your browser can create it; if not, you get a JPG). PNG has no lossy compression: a 20 KB PNG is only possible with very small images or very few colours, such as a black and white signature.
Are my files uploaded to a server?
No. Everything happens inside your browser: the file is read and processed on your device and is not sent to Cocuyo or to any third party. You can check it in your browser’s network tools: your file is not sent.
Is it really free?
Yes. You can try it before signing up; to download the result we ask for a free account, with no subscription. Your free account comes with 30 welcome uses; after that, each use costs 1 credit (top-ups from US$1), and they are unlimited with Basic or Pro. It never adds a watermark.
Learn how to…
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