Where you need an image under 50KB
A 50 KB limit is common for photo uploads on online forms, recruitment sites and school portals. It is also a sensible size for forum avatars, email signature images and small product thumbnails, where a light file loads instantly.
At this size a photo of about 600 by 600 pixels, or 700 by 500, usually looks clean. Bigger photos can fit too, but you start to see softer detail.
How to compress an image to 50KB
Upload the image. The 50 KB target is selected for you, and PNG uploads default to JPG output so the target applies. Choosing PNG output would turn the target off, because PNG is lossless. The tool then finds the highest quality that keeps the file under 50 KB.
If quality alone can't get there, the tool reduces the pixel dimensions in small steps and tells you it did. To control the final dimensions yourself, resize the image first and then compress it.
JPG or WebP at 50KB?
For a form or portal, choose JPG. It is accepted everywhere. For your own website, WebP often fits noticeably more detail into the same 50 KB and keeps transparent backgrounds, which JPG can't do. Every current major browser displays WebP.
If you are compressing a logo or an icon with flat colors, PNG may already be small. Try the PNG output and compare the size before you pick a lossy format.
Checking the result before you upload
The results panel shows the compressed size and the new dimensions. Compare both with the form's rules before you upload. Many forms state a maximum file size and some also give a minimum width and height. If the dimensions were reduced below what the form needs, crop closer to the subject instead, so the remaining pixels go to what matters, and compress again.