Convert Image to JPG under 20KB
Turn a PNG, WebP, HEIC or JPG into a JPG under 20 KB in one step — conversion and size target together, entirely in your browser.
Drop an image here or click to browse
Supports PNG, JPG, and WebP — compressed to ≤ 20 KB automatically
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20 KB is a signature limit, not a photo limit
When a form asks for 20 KB, it is almost always asking for a signature, a thumb impression, or a very small photograph. That distinction matters, because ink on white paper compresses extraordinarily well — most of the image is a single flat colour — while a face photograph at 20 KB is visibly degraded no matter what tool you use.
So if you are converting a signature: crop tightly to the ink, leave only a few millimetres of white margin, and the result will be crisp. If you are converting a photograph and 20 KB is genuinely the limit, reduce the dimensions deliberately first — a sharp 300×400 image beats a smeared 1000×1300 one at the same file size, every time.
Watch the lower bound here more than anywhere else. Portals that ask for 20 KB frequently specify a range like 10–20 KB, and a tightly-cropped signature can compress down to 5 or 6 KB — small enough to be rejected. If that happens, scale the image up to around 300×130 pixels and convert again.
How to use Convert Image to JPG under 20KB.
- 1
Drop any image in — PNG, WebP, JPG, or a photo straight from your phone
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The tool converts it to JPG and compresses until it is under 20 KB
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Check the result card for the final size and the preview for quality
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Click Download to save the JPG
Why use this tool.
Satisfy forms that demand "JPG, under 20 KB" without using two different tools
No intermediate file to clean up afterwards
ID photos, signatures and documents never leave your device
Free, no watermark, no daily limit
About Convert Image to JPG under 20KB.
Upload forms usually state two requirements in one line: the file must be a JPG, and it must be under 20 KB. Meeting both normally means a converter followed by a compressor, and a stray intermediate file in your downloads folder. This tool does it in one pass — drop in a PNG, WebP, HEIC or oversized JPG and it re-encodes to JPEG while searching for the highest quality that still fits under 20 KB, reducing dimensions only if quality alone cannot get there. Transparency is flattened onto white, because JPG cannot store an alpha channel. Everything runs in your browser: the photo is decoded, converted and compressed on your own device, which matters when the file in question is an ID photo or a signed document. The tightest common requirement, usually for signatures and thumb impressions.
Frequently asked questions.
Why do forms ask for a JPG under 20 KB specifically?
Two separate constraints that get combined into one sentence. JPG because it is the one image format every system since the 1990s can read. 20 KB because storing millions of uploads costs money, so portals cap what they accept. Most tools solve one or the other; this one does both at once.
What happens to a transparent PNG?
JPG has no alpha channel, so any transparent area is filled with white before encoding. For a photo or a scanned document that is exactly what you want. For a logo you need to keep as a cutout, convert to WebP or keep the PNG instead.
Can I feed it an iPhone HEIC photo?
On Safari and most current browsers, yes — the browser decodes HEIC natively and the tool re-encodes it as JPG. If your browser refuses the file, run it through the HEIC to JPG converter first, then bring the JPG back here.
How does it hit 20 KB exactly?
It binary-searches JPEG quality, re-encoding until it finds the highest setting that still fits under 20 KB. If even low quality is too large — common with very high-resolution photos — it reduces the dimensions and tries again, so the result stays as sharp as the limit allows.
Is anything uploaded?
No. Decoding, conversion and compression all run in your browser tab. You can load this page, disconnect from the internet, and it still works.