A photograph off a phone is eight to twelve megabytes of detail that no upload form, no e-mail and no website was ever going to show you. Drop it in and it is re-encoded at the quality you actually need — or worked down a ladder of qualities and resolutions until it fits under a size you name. Several at once, and the result is never larger than what you started with.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: image compressor, compress jpg, reduce image size, compress photo to 50kb, shrink png. It is the same tool whichever way you found it.
No. The image is decoded, re-encoded and written by this browser tab using the canvas the browser already has — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and it still works.
Yes. Switch to "Exact size", type the ceiling, and the tool searches the quality range for the best result that still fits, dropping the resolution only when quality alone cannot get there. The size it actually reached is shown before you download, so you are never guessing whether the form will accept it.
JPEG for photographs — it is what every form expects and it is the smallest of the three at the same visible quality. PNG for screenshots, logos and anything with hard edges or transparency, where JPEG smears the edges. WebP is smaller than both and every current browser reads it, but plenty of upload forms still refuse it, so it is not the default.
It keeps its transparency if you keep it as a PNG or a WebP. Converting it to JPEG cannot — that format has no alpha channel at all — so the transparent areas are filled with white rather than the black most converters leave behind. The tool says so in the notes when it does it.
Yes, and that is worth knowing in both directions. Re-encoding through a canvas drops every EXIF field the camera wrote, including the GPS coordinates — good if you are posting the picture, and worth a copy of the original first if you were relying on the date or the camera settings being in there.
There is no account, no daily cap and no watermark. The practical ceiling is your own device: everything happens in the tab, so a very large image is limited by memory, and a browser will refuse a canvas beyond roughly 16 megapixels — past that the tool scales the picture down rather than failing.