Compress Image to 20 KB
100% privateGet a signature or photo under 20 KB for an online form. Compressed on this device, never uploaded.
Pick the limit the form is asking for. We find the best quality that fits under it — you never have to guess a percentage.
Keep JPG for anything you’re uploading to a form — some portals still reject WebP. PDFs always come back as PDFs.
Advanced options
The picture is fitted inside this box and keeps its shape — nothing is ever cropped without you asking.
Refuse to go below this quality, even if that means missing the target. Raise it if you’d rather have a slightly bigger file than a blotchy one.
Checking usage…
Step by step
How to compress an image to 20 KB
Under 20 KB is already selected, so this is drop, press and download.
Add your image
Drag it onto this page, or press Choose files. JPG, PNG and WebP all work, and you can pick several to fit each one under 20 KB separately.
Check the limit
Under 20 KB is preselected. If the form also says the file must be at least 10 KB, pick the matching exam preset in the list instead.
Press Compress
The tool searches for the highest quality that still fits, and reduces the pixel size only if quality alone can’t get there.
Download
Look at the thumbnail first: it is the real output, not a preview. Then save it with the green button.
What 20 KB means
Twenty kilobytes is small, so plan for it
A phone photo is usually 2–5 MB, so getting it under 20 KB means shrinking it a hundred times or more. Forms ask for this size mostly for signatures, which are simple ink on white paper and compress well. A full-colour photo at 20 KB will look soft, because it has to lose resolution to fit.
Signatures
Sign in black ink on plain white paper, photograph it in good light and crop away everything except the signature. The less empty paper there is, the more of the 20 KB goes on the ink.
Black and white helps
Under Advanced options, Convert to black and white makes scans and signatures roughly a third smaller. That is often the difference between a clean file under 20 KB and a blotchy one.
When there’s a minimum too
Many exam portals reject files that are too small as well as too big: SSC and IBPS signatures must be 10–20 KB. Choose that preset and the result lands inside the range. A plain Under 20 KB target never adds size, so an already tiny file stays below the minimum.
Private by design
Why this compressor can’t leak your file
Think about what people actually compress: a photo of themselves for an exam form, a scan of a passport or PAN card, a signature, a salary slip. Most free compressors upload all of that to a server, shrink it there, and hand back a link — one popular tool states plainly that your images sit on its server for thirty minutes afterwards. This one works differently, and you can check that yourself.
Zero uploads
The compressor is downloaded to your browser once. From then on it reads your file straight from your own disk. Your photo never enters a network request, so there is no copy of it anywhere for us to keep, lose, or be compelled to hand over.
Nothing stored
The original and the compressed copy live only in this tab’s memory. Close it and both are gone immediately — no processing queue, no temporary folder, no “we delete files after thirty minutes” promise you have to take on trust.
No account
No sign-up, no email address, no daily limit, no watermark stamped across your photo, and no paid tier that unlocks the size you actually needed.
To be precise about what does leave your device — because “100% private” is easy to say and worth checking. Two things, neither of them your file:
1. When a compression finishes, this page sends one anonymous message to our counter saying “reduce-file-size was used”. No file, no file name, no sizes, nothing identifying you. It exists so the usage number above is a real one rather than something we invented.
2. Google Analytics records the page view and that a compression happened, the same as on every other page of this site. It is told which size limit and format you picked from the lists, and whether the result fitted — never anything about your file: not its name, its size, how much smaller it got or how many you compressed. You can block it and the tool works exactly the same.
Your photos and documents are in neither. They never enter a network request at all — and unlike a promise, that is something you can check. Turn off your wifi, reload this page and compress something anyway. It still works. No upload-based compressor can pass that test.
At a glance
Tool specifications
| Input | JPG, PNG, WebP, GIF, BMP and AVIF images; PDF documents |
|---|---|
| Output | JPG or WebP for images; PDF for PDFs. Several images arrive as one ZIP |
| Target sizes | 20 KB to 5 MB from the list, or any custom value up to 50 MB |
| What “KB” means here | 1 KB = 1024 bytes, matching Windows, macOS and virtually every upload form |
| How the target is met | Highest quality that fits, found by binary search; resolution is reduced only when compression alone cannot get there |
| Batch | Up to 60 images at once, each fitted to the target individually. One PDF at a time |
| PDF caveat | Pages are rebuilt as pictures, so text stops being selectable or searchable. You are warned before it happens |
| HEIC (iPhone photos) | Works in Safari on iPhone and Mac. In Chrome, Firefox or Edge, turn it into a JPG first with our Image Format Changer, which carries its own HEIC decoder |
| PNG output | Not offered — PNG has no quality setting, so a byte target can’t be met without throwing away pixels |
| Maximum file size | 150 MB hard limit; a warning above 25 MB |
| Where processing happens | In your browser, on your device — nothing is uploaded |
| Works offline | Yes, once the page has loaded, including as an installed app |
| Sign-up | Not required, not offered |
| Watermark | None |
| Price | Free |
Questions
Compressing to 20 KB, answered
Is my image uploaded anywhere?
Will the result be exactly 20 KB?
Is 20 KB counted as 20,000 or 20,480 bytes?
Can a photo really fit in 20 KB?
What sizes do SSC and IBPS ask for?
Why does my PNG come back as a JPG?
My iPhone photo won’t open. Why?
Can I compress several images at once?
Keep it handy
Save it, share it, or tell us what’s missing
Come back to it
Bookmark the page, or pin it to your saved tools so it sits at the top of the tools list on this device.
Something not right?
If a file wouldn’t open, a form still rejected the result, or the preset you needed isn’t in the list, tell us. The form opens with the tool already filled in, so you only have to describe what happened.
More free tools
Other things you can do here
Every one of these runs the same way — on your device, with nothing uploaded.
This page is the Reduce Any File Size, set up for one job. Others like it: HEIC to JPG · WebP to JPG · JPG to PDF · PDF to JPG · Compress PDF · Compress Image to 50 KB · Compress Image to 100 KB.