Compress Image to 20KB — Free Online Compressor
Shrink an image to roughly 20KB in a couple of clicks. This is the size most application forms ask for when they want a scanned signature, and it is small enough that getting there by hand is genuinely fiddly.
Need a different size?
Why compress to 20KB here
- Hits the number forms ask forThe target is pre-set to 20KB, so you can upload and download without touching a setting.
- Best case for signaturesLine art on a white background is exactly the kind of image that survives heavy compression well.
- Works on phone scansPhotograph your signature on paper and compress the result straight from your phone.
- Nothing installed, nothing storedRuns in the browser and files are deleted after processing.
How to Compress an Image to 20KB (Step-by-Step)
- 1
Upload your image
Click the upload button or drag in a JPG, PNG or WebP file.
- 2
Check the target size
The target is already set to 20KB — change it only if your form asks for something different.
- 3
Click Compress
The image is reduced towards the target in a few seconds.
- 4
Download the result
Download immediately. No account, no email, no watermark.
When you need an image at 20KB
- Signature upload on an application form: The most common reason anyone needs a file this small.
- Scanned initials or a handwritten declaration: Simple dark-on-white scans compress down to this size cleanly.
- A form that rejects everything you try: When repeated attempts keep coming back as 'file too large'.
- Slow or metered connections: A 20KB upload succeeds where a multi-megabyte one times out.
How to get a clean signature at 20KB
Start from the cleanest source you can. Sign on plain white paper with a dark pen, then photograph or scan it in good, even light. The higher the contrast between ink and paper, the better the result survives compression, because there is less subtle tonal detail for the encoder to throw away.
Crop tightly to the signature itself before compressing. Every pixel of empty margin is data competing for the same 20KB budget, so removing the surrounding page leaves far more of it for the part that matters.
Avoid photographing a signature in dim or uneven light. Shadows and grey gradients across the paper are exactly the kind of detail that eats a small size budget and produces a muddy result.
If your image will not reach 20KB cleanly
Some images simply carry too much detail to land at this size and still look right — a colour photograph, a busy scan, or anything with a textured background. Compression can reach the number, but the result may not be something you want to submit.
In that case, reduce the image's dimensions first. A signature does not need to be 3000 pixels wide; a few hundred pixels across is plenty for any form, and cutting the dimensions reduces the file size dramatically before compression even begins.
It is also worth re-reading the requirement. Forms often state a range rather than a hard ceiling, and many that appear to demand 20KB will happily accept anything under it — or turn out to have been asking for the signature, not the photo.
Privacy and Security
Every image you upload is transmitted over an encrypted HTTPS connection. Once compression finishes and you have downloaded the result, both the original and the compressed copy are permanently deleted from our servers. We never store, view or share your files — which matters when the image is a signature, an ID photo or a scanned personal document.
Frequently Asked Questions
Will my signature still be readable at 20KB?
Yes, in almost all cases. Signatures are dark ink on a light background with very little fine detail, which is the ideal case for compression. Starting from a well-lit, tightly cropped scan makes the result cleaner still.
Why does my photo look blocky at 20KB?
Photographs contain far more detail than line art, and 20KB leaves very little room for it. If the form wants a photograph rather than a signature, check whether it actually allows 50KB or 100KB — it usually does.
Can I compress several images at once?
Yes. Upload multiple files and each is compressed towards the same target size, then downloaded individually.
Does compressing change the image dimensions?
The tool works on file size rather than resizing your image. If you need smaller dimensions too, crop or resize before uploading for a much better result at this target.
Is there a watermark?
No. Nothing is added to the compressed image.