Compress JPG to 40 KB
Reduce a JPG, PNG or WebP image to under 40 KB for exam and job forms. Keep the size or set pixels or cm. Free, no signup, files stay local.
Use the interactive tool to choose your image and create a download under 40 KB. JavaScript is required for local processing. No account needed.
How to compress a JPG to 40 KB
A 40 KB limit leaves good room for a face photo and keeps small scanned documents readable.
Resizing a photo to 40 KB, reducing image size to 40 KB and a photo KB reducer all mean the same: a JPG file of 40 KB or less.
- Choose a JPG, PNG or WebP image up to 300 MB. The 40 KB limit is already selected.
- Keep the size, or enter the pixels or centimetres your form asks for.
- For a signature or document, tick Black and white for sharper lines.
- Press Compress image, check that it says “Under 40 KB” and the preview looks clear, then download.
WaterPDF finds the highest JPG quality that fits. If you keep the original size and that is not enough, the picture is made smaller in pixels. Your original image is never changed.
What fits in 40 KB?
| Picture | Under 40 KB |
|---|---|
| Passport-size photo | Fits in good quality |
| Scanned ID card | Fits and stays readable |
| Full phone photo | Fits after reducing its pixel size |
Questions about 40 KB limits
How do I reduce a photo to 40 KB?
Choose your photo above. The 40 KB limit is already selected. Press Compress image and download the JPG.
Will the photo stay the same shape?
Yes, unless you enter both a width and a height with a different shape. Then it is cropped from the centre instead of stretched.
Is my photo uploaded?
No. The photo is compressed in your browser and the JPG is created on your device.
Are my files uploaded?
No. Selected file contents are processed in your browser. Normal page requests still reach the hosting provider. Use a trusted device and keep your originals.