Compress Image to 40KB

Reduce your photo or signature size to under 40 KB for exam, job and government forms. The 40 KB target is already set, so just add your image.

Under 40 KBJPG Runs on your device

Compress to 40KB · Step 1 of 3 · Add your photo

Drop a photo to compress it under 40 KB

or paste with Ctrl+V · JPG PNG WebP HEIC GIF · max 25 MB

Under 40 KB · JPGBatch ready

Processed on this device. Nothing is uploaded.

Example

Before and after

We ran this sample through the compress to 40kb tool above. The numbers under each image are measured from the real files.

Sample input: 3974 x 5000 px · 1.2 MB · JPG — **Before**3974 x 5000 px · 1.2 MB · JPG

Result from this tool: 1590 x 2000 px · 39.1 KB · JPG — **After**1590 x 2000 px · 39.1 KB · JPGShown smaller here

How to

How to compress Image to 40KB

1.
Add your photo. Choose a photo from your phone or computer. It opens right here.
2.
Keep the 40 KB target. The size is already set to 40 KB. Change it only if your form asks for a different limit.
3.
Download. Check the new size, then upload it to your portal.

Why this size

Why do forms ask for photos under 40 KB?

A 40 KB limit is common on job portals and visa systems. It is small enough to keep their databases lean but large enough for a clear head-and-shoulders photo.

Most phone photos are 40 to 100 times bigger than that. The tool lowers the JPG quality in small steps and only shrinks the dimensions when quality alone cannot reach 40 KB.

Upload	Typical limit
Job portal photo	20-50 KB
Visa e-form photo	up to 50 KB
Exam photo	10-20 KB
Online form	50-100 KB

Use cases

When you need a 40 KB photo

Job applications

Public service and private job portals with 50 KB limits.

Visa e-forms

Online visa systems that reject photos over the limit.

University admissions

Application portals that ask for a small, clear photo.

Online exams

Candidate photos and ID scans for test registration.

Profile pictures

Avatars for forums, HR systems and school portals.

Messaging

Quick photos that do not eat into mobile data.

Tips

Tips that make a difference

Crop first

Cropping to just the face or document removes pixels you do not need, so the quality can stay higher.

Use JPG

JPG gets much smaller than PNG for photos. Use PNG only if the form asks for it.

Check the dimensions too

Some portals also require a size such as 3.5 x 4.5 cm or 200 x 230 px. Set both to avoid a second rejection: resize in cm or in pixels first, then compress.

Plain backgrounds compress better

A plain wall behind you leaves more of the 40 KB for your face.

FAQ

Compress to 40KB: questions

Add your photo above and download the result. The 40 KB target is already set: the tool lowers the JPG quality step by step, and the pixel size only if it must, until the file is just under 40 KB.

Open this page in Chrome or Safari, tap to pick a photo or take a new one, then download. It works on Android and iPhone with nothing to install.

Yes. Phone photos are usually 2 to 5 MB, about 2,000 to 5,000 KB (the MB to KB converter explains the units). The tool reduces the pixel size as well as the quality when it has to, so even a large photo gets under 40 KB.

No. At 40 KB most photos look the same as the original on screen.

The result lands just under the limit, usually within a few percent of 40 KB, so the form never rejects it for being too big.

Add a PNG, HEIC, WebP or JPG photo. The result is always a JPG just under 40 KB, so converting and compressing happen in one step.

No. Compression runs in your browser on your own device. The photo never reaches our servers.

A JPG. Almost every form accepts it, and it gives the smallest files for photos.

Checked

How we checked this page

Checked by the SizePort team on 3 October 2026.

We test the tool with sample photos before it goes live and check that the sizes on this page match what it produces. Rules and platforms change, so if something here is out of date, tell us and we will correct it.

How the tool works

The compressor first lowers the JPG quality at full resolution, testing several settings until the file is just under the target. Only if quality alone cannot get there does it reduce the width and height, a little at a time. The result is a JPG. Everything happens in your browser; your images are never uploaded.