Compress an image to 15 KB
15 KB is rarely a cap by itself — it’s the smart target when a form demands a range. SSC, for instance, requires signatures between 10 and 20 KB: aiming at 15 KB puts you safely in the middle of the band, with room to spare on both sides even if the portal measures size slightly differently than your computer does.
Everything here happens on your device. Pick your file, and the tool binary-searches the JPEG quality setting until the output lands just under 15 KB — no server, no queue, no watermark.
Drop images here — or click to browse, or paste with Ctrl+V
JPG · PNG · WebP — processed on your device, never uploaded
How it works
- Open this page — the compressor is already set for “Compress image to 15 KB”.
- Drop your image into the box, click to browse, or paste it with Ctrl+V.
- The tool re-encodes the image on your own device until it fits the target — nothing is uploaded.
- Check the preview and file size on the result card, then download.
What 15 KB looks like
Signature scans and simple graphics: indistinguishable from the original at sensible dimensions.
Passport-style face photos: acceptable at around 300–400 px on the long side; expect mild softening. Full scenic photos will show visible artifacts at this size — if your form allows 50 KB or more, use a bigger target and keep the quality.
Getting the dimensions right
For a 4 × 2 cm signature box, an image around 470 × 235 px (that ratio at 300 DPI) compressed to 15 KB is comfortably clean.
Frequently asked questions
Why aim for 15 KB when the limit says “up to 20 KB”?
File-size measurement can differ by a few hundred bytes between your machine and the portal (metadata, filesystem rounding). Targeting the middle of the band means a file that passes validation everywhere, every time.
Can I compress a PNG to 15 KB?
PNG has no quality dial — it’s lossless — so the only way to shrink it is fewer pixels. This tool will scale a PNG down until it fits, but for photos and signatures you’ll almost always get a better-looking 15 KB file by choosing JPG output.
Does compressing repeatedly make the image worse?
Re-encoding a JPEG over and over adds up. This tool decodes your original once and encodes once at the final quality, so you don’t accumulate generations of loss the way “compress, check, compress again” workflows do.