What it does
Drop one image or a whole batch, choose a format, and every file is converted on the spot. The list shows each image’s original and new dimensions, the original and new file size, and how much smaller (or larger) it got, plus a total for the batch.
- Formats: PNG, JPEG and WebP, plus AVIF when your browser can encode it (the button only appears if it can).
- Quality slider for JPEG, WebP and AVIF. Changing any setting re-converts the batch automatically.
- Resize to a maximum width and/or height. The aspect ratio is always kept and images are never enlarged. Large reductions are done in steps for a sharper result.
- Background colour replaces transparency when converting to JPEG (which has no alpha channel), or for any format with Fill transparency.
- Download files one by one or all at once.
How to use it
- Drop images on the page, paste a screenshot, or click the drop area to pick files.
- Pick the output format and adjust quality or size.
- Download the results.
Good to know
- Conversion uses your browser’s own encoders, so results and the formats you can open vary slightly between browsers.
- Metadata such as EXIF camera data and GPS location is not copied to the new file. Photos are rotated according to their EXIF orientation first.
- Animated GIF and WebP files are converted as a single still frame.
- A lossless PNG re-saved as PNG is often not smaller; WebP or AVIF usually are.
Privacy
Images are decoded and encoded locally on a canvas. They are never uploaded.