Compress Image to 20KB Online Free – Photo & Signature

Drop images here or browse files

JPG, PNG, WebP · up to 30 images · you can also paste with Ctrl+V

Quality: 75%70–80% is ideal for websites.

Output formatPNGs are optimised losslessly with OxiPNG; WebP or AVIF give the biggest savings.

Max width in px (optional)Larger images are scaled down.

Target size in KB (optional)Each image is saved just under this size.

Pre-set for you: the target size is 20KB. You can still change the target, the format or the maximum width before you press Compress images. Need every option? Open the full Image Compressor.

When do you need a 20KB image?

Online application forms are the usual reason. Government job portals, entrance exams, scholarship and university applications often limit the signature scan to 10–20KB and the candidate photo to 20–50KB, and they reject anything bigger. A photo straight from a phone is usually 2–5MB, so it has to shrink by 99% or more.

This page opens the Tolket Image Compressor with the target already set to 20KB. It first looks for the highest quality that still fits, and only reduces the pixel dimensions when quality alone cannot get under the limit, so you keep as much detail as possible.

How to compress an image to 20KB

Crop away empty space first with the Image Cropper. A tight crop leaves more bytes for the part that matters.
Drop the JPG, PNG or WebP file into the box above, browse for it, or paste it with Ctrl+V. You can add several files; each one is compressed to 20KB on its own.
Leave the target at 20 and press Compress images.
Check the new size in the list, then click Download, or Download all (ZIP) for a batch.

What fits in 20KB?

Image	Rough size that fits in 20KB	Why
Signature on white paper	up to about 600 × 250 px	Plain white areas take almost no space
Passport-style face photo	about 300 × 400 px	A plain background compresses well
Detailed photo (trees, crowds, text)	about 350 × 250 px	Fine detail needs more bytes

These are rough guides for JPG at medium quality. The tool measures your actual file, so you do not need to calculate anything.

Tips for a sharp 20KB file

Scan or photograph signatures in dark ink on plain white paper, in good light. Paper texture and shadows waste bytes.
If the form also gives pixel dimensions, resize to those first with the Image Resizer, then compress.
Some portals count 1KB as 1,000 bytes instead of 1,024. Tolket uses 1,024, so if a portal rejects a file of 19.9KB, set the target to 19 and try again.
When a target size is set, PNG files are saved as JPG, because PNG is lossless and cannot be squeezed to an exact size. Most forms ask for JPG anyway.

Frequently asked questions

Will a 20KB photo be accepted by an online form?

Usually, as long as it also meets the form’s other rules. Many forms set a minimum width and height and ask for JPG, so read the instructions and resize first if they give exact pixels.

Can I compress to 10KB or 15KB instead?

Yes. Type any number from 5 upwards in the target box. Below about 10KB photos lose visible detail, so crop tightly before compressing.

Is my signature or ID photo uploaded?

No. Compression runs inside your browser with WebAssembly encoders such as MozJPEG, so your files never leave your device.

Want the full walkthrough? Read our guide how to compress an image to 20KB, 50KB or 100KB.