Free tool

Compress image to 20KB

Get a photo, scan or signature under 20KB for an upload form, an email or a website. Arche lowers the quality first and scales the image down only when the picture would turn blocky. Your files never leave your device.

Free, no sign-up
Runs in your browser, nothing uploaded
Many images at once

Compress to 20KB

On this device

Drop images hereWebP, PNG, JPG, GIF, BMP or AVIFChoose imagesProcessed on your device. Nothing is uploaded.

Form preset

Target size (KB)

Each file comes out at or just under this size. 1 KB = 1,000 bytes.

Form requirements: minimum, pixels, DPI

Minimum size (KB, optional)

Width (px)

Height (px)

Fill in both for an exact pixel size, as many exam and ID forms ask.

DPI (optional)

Black and white

For forms that ask for a black-and-white signature.

Allow smaller dimensions

When the quality would have to drop below 60, scale the image down instead until it fits.

Output format

Your browser decodes and re-saves each image. Nothing is sent to Arche's servers, and re-saving drops EXIF metadata such as GPS location.

Guide

Good to know

How it gets under 20KB

Each image is saved as JPG or WebP at the highest quality that fits under 20KB. When that would mean a blocky picture, Arche scales the image down instead, a step at a time, and keeps the quality at 60 or above: a slightly smaller image is far easier to read than a blurry one. Every result shows its file size, quality and pixel size.

Where 20KB limits come up

Government, exam and job application portals often cap scanned signatures at 10 to 20 KB and photos at 20 to 50 KB. A signature on white paper fits easily. For a photo, crop it to the head and shoulders first and then compress it, so the face keeps its detail.

Photo and signature sizes for common forms

Pick one of these under Form preset and Arche sets the size range, pixels and DPI for you. The figures come from each body's published upload instructions, checked in November 2026. They can change between notifications, so check yours before you upload.

Photo and signature sizes for common forms
Document	Pixels	File size	DPI
IBPS / SBI photo	200 × 230	20–50 KB	—
IBPS / SBI signature	140 × 60	10–20 KB	—
IBPS / SBI left thumb impression	240 × 240	20–50 KB	200
IBPS / SBI handwritten declaration	800 × 400	50–100 KB	200
SSC signature	Any	10–20 KB	—
NEET UG / JEE Main photo	Any	10–200 KB	—
PAN photo, Protean (NSDL)	197 × 276 (3.5 × 2.5 cm)	up to 50 KB	200
PAN signature, Protean (NSDL)	354 × 157 (2 × 4.5 cm)	up to 50 KB	200
PAN photo, UTIITSL	213 × 213	up to 30 KB	300
US visa photo (DS-160)	600 × 600	up to 240 KB	—

Photo and signature sizes for all exams

FAQ

Frequently asked questions

Something else? Write to support@niamori.ai.

Will the file be exactly 20KB?

It will be just under 20KB, usually within a few percent. Upload forms check that a file is not larger than the limit, so slightly under is what you want. Arche counts 1 KB as 1,000 bytes, so the file also passes forms that count 1 KB as 1,024 bytes.

Can I keep the same width and height?

Yes: turn off Allow smaller dimensions. Arche then only lowers the quality, and tells you if an image can't get under 20KB at its current size. If a form also asks for exact pixel dimensions, enter them under Form requirements.

What if the form also has a minimum size?

Open Form requirements and fill in the minimum, or pick your form under Form preset. Arche keeps each file between the two sizes and, if a file would come out too small, pads it up without changing the picture.

Are my images uploaded?

No. The conversion runs inside your browser, so your images stay on your device. Files are only uploaded if you choose to optimize them with Arche, and those are deleted within 48 hours.

What is Arche?

Arche makes JPEG, PNG and WebP images smaller without changing their format or pixel size, and strips metadata such as EXIF location. It is free without an account; Pro raises the batch limits.

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Need smaller files, not just a new format?

Arche recompresses JPEG, PNG and WebP in the same format and size. Free without an account; files are deleted within 48 hours.

Optimize images See pricing