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Compress Image to 15 KB
Compress an image to 15 KB or less in your browser — free, unlimited, nothing uploaded to a server.
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 15 KB does to a picture
15 KB is the size that suits stamps, seals and letterheads. These are images with a few flat colours and fine curved outlines — a circle of text around a crest, for instance — and they stay sharp here as long as you keep the pixel dimensions.
Reduce the dimensions of a stamp and the ring of text around it becomes unreadable, which is the usual reason a compressed seal gets rejected. Cut the quality, keep the size.
When a form insists on 15 KB
- A stamp or seal upload with a 15 KB limit
- Letterhead and watermark images for documents
- Small two- and three-colour logos
- Monochrome charts and diagrams that must stay readable
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 15 KB
Crisp for flat-colour artwork provided the dimensions are kept. Colours may shift very slightly on images with soft edges and drop shadows.
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 15 KB?
Drop your image into the box above, check that the target reads 15 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 15 KB?
Soft, yes. At 15 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 15 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 15 KB ruin the quality?
Crisp for flat-colour artwork provided the dimensions are kept. Colours may shift very slightly on images with soft edges and drop shadows.
Can a photograph survive at 15 KB?
Only as a small image. Expect to lose pixel dimensions as well as quality, and expect it to look soft. If the form shows the photo at thumbnail size anyway, that trade is usually fine.
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 “15 KB or less” mean here?
The tool aims just below your number, never above it. If the image is already smaller than 15 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.
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