Compress Image to 30 KB Online
Shrink any image to 30 KB or less with the best quality that fits — no manual quality sliders, no trial and error. Handy for photo fields on registration portals that sit between the strict 20 KB and roomier 50 KB limits.
Choose your file
Pick a quality mode
Compress
Download
Need a different size?
Where a 30 KB image limit shows up
30 KB is the in-between cap: roomier than the classic 20 KB signature limit, tighter than the 50 KB photo allowance. You will meet it on some university application portals, employee registration systems, ID-card upload forms and older government sites that were tuned for slow connections. It is also a sensible self-imposed budget for avatars and profile photos you want to load instantly.
Because it is less standardised than 20 KB or 50 KB, forms that ask for 30 KB often surprise people mid-application. Rather than juggling quality sliders in a photo editor, this page locks the compressor to a 30 KB budget and does the math for you.
Exact-size compression, measured not guessed
Quality sliders lie: the same “80%” produces wildly different file sizes depending on the photo’s detail, noise and dimensions. That is why saving at a guessed quality rarely lands under a byte cap on the first try. This tool works the other way around — you fix the size, and it searches for the highest quality and largest dimensions that fit, verifying the real encoded bytes on the server before handing the file back.
The preview on this page runs the very same planner the server uses, so the predicted output size you see before uploading is the plan that actually executes — not marketing copy.
What fits comfortably in 30 KB
A passport-style photograph 300–450 pixels wide at good JPG quality fits nicely into 30 KB — faces stay sharp and skin tones stay smooth. A simple graphic or a tightly cropped scanned document also works. What does not fit is a full-resolution phone photo at its original dimensions; expect the tool to scale it down, which is precisely what upload forms want anyway.
If your form allows bigger files, use the room: compress image to 50 KB preserves visibly more detail. If your limit is actually tighter — many signature fields are — switch to compress image to 20 KB. For full control over pixel dimensions first, run your image through the image resizer.
Free, fast and private
No account, no watermark, no daily paywall — upload, compress, download, done. Processing happens on our servers with the file kept private and automatically deleted within 24 hours. It works just as well from a phone browser as from a desktop, and repeated files can be batched in one go on the main image compressor.
Three steps, no account
Pick an image
JPG, PNG, WebP or AVIF — from your phone or computer, exactly as it came off the camera.
Let it hit 30 KB
The compressor plans, encodes and re-checks the measured size until the file fits the 30 KB cap.
Save the result
Download the compressed image and upload it wherever the 30 KB limit applies.
Frequently asked questions
How do I reduce a photo to 30 KB without losing too much quality?
Upload it here — the 30 KB target is pre-set. The tool automatically trades dimensions and JPG quality against each other to keep the most visible detail that fits, which beats manually lowering a quality slider until the size happens to work.
What image dimensions should I expect at 30 KB?
Roughly 300–450 pixels on the long side at good JPG quality for a typical photo. Simpler images (flat graphics, clean scans) can stay larger because they compress better.
Can I compress a PNG to 30 KB?
Yes. By default the output is JPG, which fits the most photo detail into 30 KB. If you keep PNG output — best for logos, screenshots or scanned signatures — the tool uses lossless palette compression and downscaling instead.
Why did my file come out smaller than 30 KB?
The tool aims at or just under the target, never over it. JPG sizes move in steps, so the closest safe landing point is sometimes a few KB below the cap — portals only reject files that are too large, never too small.
Is there a limit on how many images I can compress to 30 KB?
No signup and no artificial daily cap for normal use — fair-use quotas exist only to keep the service fast for everyone. Each file uploads privately and is deleted within 24 hours.
Related tools
Shrink JPG, PNG, WebP and AVIF images by up to 80% while keeping them sharp. Transparency always preserved — free, private, no signup needed.
Image ResizerResize JPG, PNG, WebP and AVIF images to exact pixel dimensions. Aspect ratio stays correct automatically — free, no watermark, no signup.