How to resize images and change their format

Which format to pick

For photographs WebP is usually smallest, giving a smaller file than JPG at the same visible quality. Every current browser opens it; only quite old software does not.

JPG opens everywhere at the cost of being a little larger. It is the safe choice for sending to someone or loading onto older equipment.

PNG is for images with transparency, or with text and sharp lines that must stay crisp. Saving a photograph as PNG makes the file much larger.

How far you can drop the quality

For pictures that will only be viewed on a screen you can go surprisingly low before it shows. You cannot undo it afterwards, so keep the original somewhere.

Images with text or thin lines get messy edges when the quality drops. Use PNG for those instead.

What gets stripped from your photos

Because the browser redraws the image, the capture data attached to the original is not carried over. The date, the camera model, and the GPS coordinates of where it was taken all disappear.

For a photo you are about to send to someone, that is a good thing. If you need that data kept, do not use this tool.

Where your files go

Nowhere. Pictures are opened and processed inside your browser and you simply download the result. The only thing the server hears is that someone ran the tool once.

That is why there is no sign-in and no history of what you processed.

When it struggles

Dropping many very large photos in at once will strain the device, because all the work happens in the browser. Process them in smaller batches.

On a phone, letting the screen lock can pause the work. Keep it awake until it finishes.

If a file will not open, the browser does not know that format. For an unusual extension, convert it to a common format first.