Compress Image to 40KB
Free tool to compress or reduce any JPG, PNG or WebP image to 40KB online. Runs 100% in your browser – your photos are never uploaded. Perfect for exam & job-application forms.
Need a photo or document under 40KB? Drop your image above and imageto10kb tunes the quality — and the resolution if needed — until the file lands at or under exactly 40KB. Nothing is uploaded; all compression happens on your own device.
Whether you want to reduce a photo to 40KB, resize a JPG to 40KB, or shrink a PNG for an online form, imageto10kb does it in seconds. Unlike a plain quality slider, it keeps testing settings until the file is at or just under 40KB, so you never guess or re-export. Because it runs in your browser, it even works offline once the page has loaded.
How to compress an image to 40KB
- Open imageto10kb. Drag your photo onto the box above, or click to choose a JPG, PNG or WebP file from your device.
- Set the target to 40 KB. Type 40 in the target-size box or tap the 40 KB preset. You can also lock exact pixel dimensions if your form requires them.
- Click Compress. imageto10kb re-encodes the image right in your browser, automatically searching for the highest quality that still stays under 40 KB.
- Download. Check the before/after preview, then download your 40 KB image, ready to upload anywhere.
Frequently asked questions
How do I compress an image to 40KB?
Upload your image, set the target to 40 KB, and click Compress. imageto10kb searches for the best quality that stays under 40 KB, then lets you download the result.
Will the quality drop?
For small targets like 40KB some quality loss is unavoidable, but the tool keeps the highest quality that still fits, so it looks as good as 40KB allows.
Is it really free and private?
Yes. No sign-ups and no server uploads — compression runs entirely in your browser using the Canvas API, so your images stay on your computer.
Which image formats can I compress?
You can compress JPG/JPEG, PNG and WebP images. The result is saved as JPG or WebP, whichever you pick.
Do I need to install any software?
No. imageto10kb runs in any web browser on phone, tablet or computer — nothing to download or install.
Can I reduce a photo to 40KB on my phone?
Yes. Open imageto10kb in your mobile browser, choose the photo, set 40 KB and compress. It works the same on Android and iPhone.