How do I compress an image to 20 KB?
To compress a photo to 20 KB, open FixDoks's Compress Image to 20 KB tool and add your file. It targets 20 KB automatically, trying quality levels first and then shrinking the pixel size if needed, so it keeps the highest quality that fits. This runs in your browser, mainly for signature scans.
Compress Image to 20 KB at a glance
| Input | JPG, PNG, WebP, HEIC |
|---|---|
| Output | JPG under 20 KB |
| Processing | In your browser; your files are not uploaded |
| Price | Free to use, no watermark |
| Download | First download free, then ₹49 for 2 months of unlimited downloads (US$3 outside India) |
| Files at once | 1 free, up to 30 with a plan |
| Works on | Chrome, Edge, Safari and Firefox on Windows, Mac, Android and iPhone |
How to use Compress Image to 20 KB
- Click Select images and choose one or more photos. JPG, PNG, WebP and iPhone HEIC files all work.
- The target is already set to 20 KB. Change the number if your form or website asks for a slightly different limit.
- Click Compress to 20 KB. Each file is squeezed to the highest quality that still fits.
- Download the files one by one, or all together as a ZIP.
What 20 KB really means
Twenty KB is a very small file. A photo has to be small in pixels as well as compressed. Forms that ask for 20 KB are often asking for a signature or a small thumbnail photo, although the rules differ between sites, so always read the exact line on your own form.
What tends to fit
- Signatures: a signature is mostly white paper with a few dark strokes, so it compresses well. A signature a few hundred pixels wide often fits comfortably, but results depend on the scan.
- Black and white scans: text and line drawings use fewer colours, and so shrink further than colour photos do.
- Small headshots: a head and shoulders photo scaled to a couple of hundred pixels across is the sort of size to expect.
- Flat logos and icons: simple shapes with few colours compress cleanly, though a PNG may suit these better than a JPG.
How to get a good 20 KB result
Start from the best source you have. A sharp, well lit original gives the compressor more to work with than a dim one. Crop closely before you compress, so the subject fills the frame and no part of your tiny budget is spent on a blank border.
For a signature, sign with a dark pen on plain white paper, photograph or scan it in good light, and crop to the ink. If the result is grey or patchy, try a thicker pen and a flatter, brighter picture. When the form also lists exact pixel dimensions, the signature to 20 KB tool is designed to meet both, and the crop tool helps with the framing.
Check the form before you settle
Some portals state a range, such as 10 to 20 KB, and reject files outside it. If you are asked for a minimum, avoid shrinking the file further than needed. Others only give a maximum. Where the page offers choices of sizes, read the instructions again, since sites update their limits from time to time.
After compressing, open the downloaded file and zoom in to check that it is readable. If the portal still says the file is too large, set the target a couple of KB lower and try again.
How the 20 KB compressor works
Most photo compressors ask you to guess a quality number and hope the result is small enough. This page works the other way round. You tell it the size limit, 20 KB, and it tries quality levels automatically, checking the real file size after each try, until it finds the highest quality that still fits. If a photo is so large that even low quality will not fit, it reduces the pixel dimensions a little at a time until it does.
The output is a JPG, because JPG gives the best quality for a given size on photos. If your original is already smaller than 20 KB, the tool keeps your original file untouched instead of re-compressing it, so you never lose quality for nothing.
Where a 20 KB limit is common
A 20 KB limit usually applies to signatures and small thumbnail photos. Many recruitment and exam portals ask for a signature scan of 10 to 20 KB. Some older government sites also use 20 KB for a photo.
Tips for the best result
- Crop first. Removing empty background before compressing leaves more of the size budget for the part that matters. Use the crop tool if needed.
- Resize big photos. A 12 megapixel phone photo has far more pixels than any form or website shows. Scaling it down with the image resizer gives a sharper result than heavy compression alone.
- Check the minimum too. Some forms reject files that are too small as well as too large. For exam forms with a KB range, use our govt form photo tools, which hit both limits.
20 KB is small
At 20 KB a full phone photo has to be scaled down a lot, so the tool will usually reduce it to a few hundred pixels wide. That is expected. If you are preparing a signature for a form with an exact pixel size, the signature to 20 KB tool cleans the background and hits the pixel size too.
KB, kB and bytes
Upload portals do not all count the same way. Some treat 1 KB as 1,024 bytes, others as 1,000 bytes. The tool treats your target as 1,024 bytes per KB. If a portal still says the file is too large, set the target a few KB lower, for example 18 instead of 20.
Signatures and thumbnails
For a signature, crop tightly around it before compressing so the 20 KB budget is spent on the ink, not on blank paper. Small icons and thumbnails fit easily; a detailed full photo will lose pixels to get this small.