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.
40 KB is a comfortable target for a passport-sized photo. A 2 MP phone portrait cropped to the standard 413×531 px lands at about 38 KB against a 40 KB limit, with the face still sharp — background texture is what gives way first. This is the band most Indian and Pakistani exam portals aim at, so where a form quotes a range rather than a ceiling, working near the top of it costs you nothing.
Which forms ask for this size
SSC photo (20–50 KB), UPSC photo (20–300 KB), UPSC signature (20–100 KB), IBPS and SBI photo (20–50 KB), RRB signature (30–55 KB) and PPSC photo and signature (10–40 KB).
What to expect at this size
40 KB gives a passport-sized photo more room than it needs. At 413×531 px the result lands around 38 KB and holds detail that a 20 KB version would lose — background texture, hair strands, and the edges of glasses frames all survive.
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, or tap the preset. If your form also states pixel dimensions — 413×531 px is the usual passport crop — tick “Resize to exact pixel dimensions” and enter them, because portals check both.
- Click Compress. The tool searches the quality range for the best result that still fits under 40 KB. On a standard passport crop that lands around 38 KB.
- Download. Check the before/after preview, then download your 40 KB image, ready to upload anywhere.
Frequently asked questions
Should I aim for the top of the range or just under?
Aim just under the maximum. Portals reject files over the limit, never files comfortably below it, and the extra kilobytes buy very little visible quality at this size.
PPSC allows 10–40KB. Which end should I pick?
Pick the upper end. PPSC sets a range rather than a ceiling, so a file near 40 KB satisfies the rule and looks better than one scraped down to 10 KB.
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.