Compress Image Between 10KB and 20KB — Free, Fast & Private
A signature field that says "10 to 20 KB" sets two limits, and the lower one catches more people than the upper. Upload portals check both ends, and a file under the minimum is turned away just as a file over the maximum is. This page opens the compressor in JPEG with a 20 KB ceiling. Signatures and stamps are the usual reason for a band this small. A scanned signature is a simple picture and often fits on quality alone, which means it may well finish under the floor; a signature photographed with a phone carries a lot more detail and tends to finish near 20 KB.
What the tool does, and what it does not
The compressor takes a ceiling: it searches for the highest quality at which the file is still under 20 KB, which tends to leave the result close to the ceiling, not far below it. That is the right behaviour for a range, because the highest quality that fits is also the file most likely to sit above the floor. But the image compressor has no floor setting: it will not enlarge a file to reach 10 KB, and it does not pad one with filler data. A picture whose own best encode is already below the floor stays below it.
Who asks for 10 to 20 KB
In the exam documents MiniPx has checked, this band belongs to signatures. The table lists every document whose stated size sits inside it, each read from the conducting body's own notice, with the page that enforces it.
| Exam | Document | Stated size | Checked |
|---|---|---|---|
| SSC (CGL, CHSL, GD, MTS) | Signature | 10–20 KB | 2026-10-05 |
| IBPS PO / Clerk (CRP-XVI) | Signature | 10–20 KB | 2026-10-05 |
| SBI PO / Clerk 2026 | Signature | 10–20 KB | 2026-10-05 |
| TNPSC (2025–26 notifications) | Signature | 10–20 KB | 2026-10-06 |
Why a signature is the hard case for the floor
A signature is dark ink on a lot of white paper, and JPEG stores flat white almost for free. So in this band the risk is usually the floor, not the ceiling: a tightly cropped signature at modest dimensions can encode under 10 KB even at high quality. Sign in dark ink on plain white paper, capture it in even light, and crop with a small margin rather than to the very edge of the strokes. If the result is still under the floor, start from a larger capture — more pixels of real ink is what lifts the size honestly, where a grey or textured background only adds noise to the picture.
What fits in 20 KB — measured on this page
We dropped five real files on the compressor above and kept what it handed back. 5 of 5 came out under 20 KB; 3 were made smaller in pixels to get there, because past a point the bytes can only come from pixels.
| File | Before | After, on this page | Under 20 KB? |
|---|---|---|---|
| 12 MP phone photo | 4032 × 3024 px · 3.73 MB | 1278 × 959 px · 13.9 KB | Yes |
| Portrait / headshot | 3264 × 4653 px · 2.25 MB | 1632 × 2327 px · 19.2 KB | Yes |
| Scanned handwritten page | 3349 × 4281 px · 2.17 MB | 1368 × 1749 px · 16.7 KB | Yes |
| Scanned signature | 2041 × 617 px · 109.1 KB | 2041 × 617 px · 19.5 KB | Yes |
| Screenshot (PNG) | 1280 × 800 px · 88.1 KB | 1280 × 800 px · 19.4 KB | Yes |
Measured 2026-10-06 in Chromium 145.0.7632.6 with this page’s own settings. The photos are public-domain and CC0 files from Wikimedia Commons; the screenshot is our own. Sizes read as the tool shows them (1 KB = 1,024 bytes); the target itself is 20,000 bytes, which is under 20 KB on either reading.
Of the 5 real files in that table, 5 finished inside the range, between 10 KB and the ceiling..
If the result is under 10 KB
Before downloading, compare the size on the result screen with 10 KB. A signature that lands under it was captured too small or cropped too tight: scan it again at a higher resolution, or photograph it closer so the page fills more of the frame, and compress again.
Exam forms that print a minimum are a different case: MiniPx's exam pages enforce the size band the exam states, floor included, using quality only and never padding. the SSC signature page shows one; the band they read from the exam's own document is 10–20 KB.
Decimal kilobytes
The sizes on this page count 1,000 bytes to the kilobyte. A portal that counts 1,024 sees the same file as slightly smaller, which matters only at the bottom of the band: a signature just over 10 KB by our count can be just under 10 KB by theirs, so aim a little above the floor.