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Compress Image to 20 KB
20 KB is the smallest size most upload forms accept. This page compresses an image to 20 KB or less, in your browser, with no signup and no daily limit.
No account · No daily limit · No card · Nothing to cancel
Full pixel size keptRe-encodes only if the file gets smaller Nothing is ever made bigger
The encoder works at a quality that does not show, and stops there. You do not pick a number.Your images are processed by your own browser. Nothing is uploaded, there is no account, and there is no daily limit.
Compress to another size
Every limit is different. These run on the same engine, so switching is instant.
What 20 KB does to a picture
At 20 KB a photograph is genuinely squeezed. A phone photo straight off the camera is typically 2–6 MB, so reaching 20 KB usually means both lowering the JPEG quality and reducing the pixel dimensions. That is normal and it is what the form is asking for.
The exception is a signature or a simple logo on a plain background. Those are mostly flat colour, compress extremely well, and can often stay at full size and still land under 20 KB with no visible loss at all.
When a form insists on 20 KB
- Photo and signature fields on online application forms that cap uploads at 20 KB
- Thumbnails and avatars where the image is displayed small anyway
- Email attachments on a restricted or metered connection
- Anywhere a form rejects your file with “file too large” and 20 KB is the stated limit
Where a limit this small comes from
Limits this low are almost always about storage, not about you: a form that expects thousands of passport photos, exam applications or ID pictures has to keep every upload somewhere, and 20 KB at a time is what that budget allows. The limits are usually written as a hard maximum with no appeal, so the only useful question is what kind of picture can actually live inside it. Line art and signatures are comfortable. A photograph is not — not because the compressor is weak, but because smooth photographic detail costs bytes and there are very few of them here.
What survives at 20 KB
Expect visible softness at 20 KB if the source is a full-size photograph — that is the honest trade at this size, not a fault in the tool. Check the preview before you submit, and if the form accepts a larger file, 50 KB will look noticeably better for the same effort.
If you are working with a photograph at this size, crop before you compress. The fewer pixels you ask the encoder to describe, the more of each one it can keep, and a tight crop of a face at 20 KB looks better than a whole street at the same 20 KB.
How it works
- Add your imageDrop it above, or choose a file from your device.
- Choose howSmallest file keeps the best quality and takes no number, or set the exact size your form asks for. Nothing is compressed until you press Compress.
- Compress and downloadPress Compress, and the finished size is shown before you save, so there are no surprises.
Questions
How do I compress an image to 20 KB?
Drop your image into the box above, check that the target reads 20 KB, and press Compress. The finished size is shown before you download, so you can see that it fits before you save it.
Does a photograph still look right at 20 KB?
Soft, yes. At 20 KB the pixel dimensions have to come down as well as the quality — no encoder can hold a full-resolution photograph in this many bytes — so expect a smaller, slightly softer picture rather than a faithful copy.
Will my signature or stamp fit in 20 KB?
Almost always, and without visible damage. A signature or stamp is dark strokes on a plain background, which is the cheapest kind of image to store. Compress it at full size rather than shrinking it first.
Will compressing to 20 KB ruin the quality?
Expect visible softness at 20 KB if the source is a full-size photograph — that is the honest trade at this size, not a fault in the tool. Check the preview before you submit, and if the form accepts a larger file, 50 KB will look noticeably better for the same effort.
Why do exam forms ask for a photo under 20 KB?
Because they hold millions of applications and the photograph is only there to identify you at a glance. A small, soft picture does that job, so the limit stays low and the storage bill stays sane.
Which format should I choose — JPG, PNG or WebP?
Photos: JPG or WebP, because they are built for photographs. Logos, signatures, screenshots and anything with flat colour: PNG, so the sharp edges stay sharp. If you are not sure, leave it on “keep original format”.
What does “20 KB or less” mean here?
The tool aims just below your number, never above it. If the image is already smaller than 20 KB it is left untouched rather than re-encoded and degraded.
Is this free? What is the catch?
There isn’t one. The compression runs inside your browser using technology already built in, so there is no server doing the work and nothing to charge for. This page shows ads, and that is the whole business model.
More free tools
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