Start with the job, not the original file
Most email and chat recipients do not need the full camera file. They need a photo that opens quickly, stays clear enough to understand, and does not waste time on upload.
Resize for the actual screen use
If the image is only meant to be viewed inside an email thread or a messaging app, a long edge somewhere around 1200 to 2000 px is usually enough. That keeps the photo readable without carrying the full weight of the original capture.
- Keep the original aspect ratio.
- Do not upscale a small image just to match a bigger number.
- Make a smaller copy instead of overwriting the original.
Choose the format after you know the purpose
JPEG is usually the right choice for normal photos because it cuts file size well. PNG is better when the image contains interface screenshots, sharp text, or transparent edges that need to stay crisp. If you want to resize immediately, use the direct Resize Image tool. If you want a neutral reference on common formats first, MDN's image format guide is a solid overview.
Check the result before you send it
Open the exported file at normal size and look at the details that matter most. For a receipt, that may be the text. For a product photo, it may be the edges and color. If the important part is hard to read, resize a little less aggressively and export again.
Move to an app when resize is not the whole task
If you also need cropping, text, repeat edits, or an offline workflow, a simple browser resize may not be enough. In that case, finish the quick send in the browser tool or switch to a dedicated photo app such as Glazr Photo for the heavier editing pass.