Shrink a photo under a form’s size limit
Lower JPEG quality, then scale, until the photo fits a few hundred kilobytes without becoming a smear.
Some forms reject anything over 200 KB and do not care that your camera saves a 4 MB photo. Compress image to a target size starts by lowering JPEG quality. If that is not enough, it scales the picture down until it is under the target or it cannot go further without becoming unreadable. You see the original size, the result, and the percent saved.
When this is the right tool
Use it for a photo the form will display as a photo: a receipt picture, a certificate scan you already photographed, a headshot that is already cropped. Set the target the form named, not a number you hope is “small enough”. If the status line says the target was not reached, the file was already tiny or the quality floor stopped the loop. Sending it anyway will still fail the form.
When it is the wrong tool
A PNG with transparency is exported as JPEG, so a logo on a clear background will gain a flat background. Do not use this page to frame a passport portrait; cropping and print size belong on the passport tool. Do not use it to shrink a multi-page PDF. That file should go through Compress PDF after you have removed pages you do not need.
Open the result before you upload it. If the text on a certificate is no longer readable, raise the target or start from a cleaner photo. The original file on your disk is not replaced. Compression runs in the browser and the image is not uploaded.