Compress image to 500 KB

A modern phone photo is often 4 to 8 MB, so a 25 MB mailbox limit fills after just three or four of them. Trimming each to around 500 KB changes the maths: you can attach forty or fifty photos in a single message instead of splitting them across several or falling back to a cloud link.

Five hundred kilobytes is chosen deliberately — small enough to send a large batch, yet high enough that each photo still fills a laptop screen cleanly, which is where most emailed photos are actually viewed. Anything larger mostly adds upload and download time without a payoff the recipient can see when they open the message.

At 500 KB an image keeps a resolution comfortable for full-screen viewing on a laptop or monitor, which is all most recipients need. The compression trims data the eye barely registers and gently reduces colour precision in areas you would not notice, rather than shrinking the picture into something soft.

The difference from the original only shows if someone prints the photo large or zooms deep into a crop; for ordinary viewing and forwarding, a 500 KB photo and its multi-megabyte original look the same.

Emailing photos usually means several at a time, so the tool takes a batch: drop the full set in and each is compressed to 500 KB on its own, then handed back together. Because the work runs in your browser, there is no upload step slowing it down and no account to create — a folder of event or project photos is ready to attach in a single pass. Your images stay on your device throughout, which matters when the batch includes anything personal.

Five hundred kilobytes is tuned for on-screen sharing by email. If the recipient needs to print the photos large, send fewer at a higher size or share the originals through a link, since print wants more detail than 500 KB carries. If you are only sending a thumbnail or a photo that will display small, a tighter target saves even more room. Match the size to how the photo will be used, and 500 KB covers the common case of viewing on a screen. For holiday or event photos sent to family, that is exactly the situation, which is why it is the default here.