My form needs a file between 10KB and 20KB — how do I do that?

Keep the target at 20KB and set the minimum to 10KB. The result shows its exact size in KB and bytes so you can confirm it's in range before uploading.

How do I compress a signature to 20KB?

Sign on plain white paper, photograph or scan it, crop tightly around the signature, then compress to 20KB. Mostly-white signature images compress very well.

Is the Compress Image to 20KB free to use?

Yes. Compress Image to 20KB is completely free with no sign-up, no watermarks and no usage limits.

Are my files uploaded to a server?

No. Compress Image to 20KB runs entirely in your browser — your files and data never leave your device.

Does it work on mobile and offline?

Yes. It works in any modern browser on desktop or mobile, and the toolkit is a PWA that keeps working offline after your first visit.

Compress Image to 20KB

Compress a photo or signature to under 20KB for online application forms. Quality and size are tuned automatically, and an optional minimum keeps it above portal limits. Free, no upload.

How it works

1
Add your photo
Drop a JPG, PNG or WebP — one or many. It's read in your browser; nothing is uploaded.
2
Set the target size
Type the maximum in KB or MB, or tap a preset like 20KB, 50KB or 100KB. Add a minimum if the form has one.
3
Let it fit automatically
The tool finds the highest JPG quality that fits, and shrinks the dimensions only when quality alone isn't enough.
4
Check and download
Each result shows its exact size in KB and bytes, so you know it will pass the upload check.

Common uses

Upload a signature scan to an exam or recruitment form that caps files at 20KB.
Fit a small ID or thumbnail photo into a strict 10–20KB range.
Shrink a stamp or logo image for an older portal with tiny upload limits.

About the Compress Image to 20KB

Compress a photo or signature to under 20KB for online application forms. Quality and size are tuned automatically, and an optional minimum keeps it above portal limits. Free, no upload.

20KB is one of the tightest limits you'll meet, typically for signature scans and small ID photos on exam and recruitment portals. At that size a colour photo usually ends up around 250–350 pixels on the long side at good JPG quality; signatures, which are mostly white, can stay larger and still fit.

Compress Image to 20KB is part of a free, privacy-first toolkit. Everything is processed locally on a Canvas with high-quality pica resampling — there are no uploads, no quality loss from a server round-trip, and no limits.

Because compress image to 20kb works without any sign-up or installation, you can use it as often as you like and it's always available — on desktop or mobile, and even offline.

Explore more image tools, or try Reduce Image Size in KB · Compress Image to 50KB.

One-click presets: Reduce Image Size in KB · Compress Image to 50KB · Compress Image to 100KB · Compress Image to 200KB · Compress Image to 500KB · Compress Image to 1MB.

Related guides

How to reduce an image's size in KB