How to use it
- Click Choose files or drop your pictures on the box. A PNG, JPEG, WebP, GIF, BMP, ICO or AVIF file will do.
- Choose Convert to and, for JPEG, pick the Background colour for any transparent areas.
- Move the Quality slider if you chose JPEG, WebP or AVIF.
- Click Convert images, then download each file, or all of them as one ZIP.
Which formats the tool reads and writes
Your browser reads PNG, JPEG, WebP, GIF, BMP, ICO and AVIF pictures and draws them on a canvas, which is then written in the format you choose. PNG keeps every pixel and transparency, and is the safe choice for logos and screenshots. JPEG is the usual format for photographs but has no transparency. WebP and AVIF are newer formats that give smaller files and can keep transparency; the browser decides whether it can write them.
- A GIF gives only its first frame: animation is not kept.
- An ICO file can hold several sizes of one icon. Where the browser cannot decode the file, the tool reads its largest picture.
- BMP pictures are read as they are and written in any output format.
Transparency and the background colour
A transparent area has no colour of its own. JPEG cannot store transparency, so each transparent area is filled with the background colour you choose before the file is written. White is the usual choice for documents; match the colour of the page where the picture will be shown if you want no visible edge.
Quality and metadata
JPEG, WebP and AVIF are lossy: the quality setting decides how much detail is discarded. PNG ignores it because it is lossless. Each converted file is written again from its pixels, so camera, date and location information are not carried into the new file.
Example: a transparent logo for a JPEG document
You have a PNG logo with a transparent background and need a JPEG for a document that cannot show transparency. Choose JPEG as the output and set the background colour to white. The logo's transparent area becomes white, and the logo itself keeps its colours.
If the document system accepts WebP, choose WebP instead: the transparency stays and the file is usually smaller than the PNG.
Frequently asked questions
Which format should I convert to?
PNG for logos, screenshots and anything with transparency that must stay sharp. JPEG for photographs where the smallest file matters and transparency does not. WebP when you need a small file that can still have transparency. AVIF for the smallest files, if your browser can write it.
Why does my transparent PNG show a coloured background as JPEG?
JPEG cannot store transparency, so the tool fills every transparent area with the background colour you chose. Pick the colour of the page where the picture will go, or convert to PNG or WebP to keep the transparency.
Can I convert an animated GIF and keep the animation?
No. The tool converts the first frame only, as a still picture. A full animation needs a different tool that writes an animated file.
Why is AVIF missing from the list?
AVIF appears only where your browser can write it. Many browsers can open AVIF pictures but cannot save them yet, so the option is hidden when it would not work on your device.
Can I convert several files to one format at once?
Yes. Add up to 50 files, choose the format, convert them all and download the results as one ZIP. Each file is converted on its own and keeps its name with the new extension.
Are my pictures uploaded when I convert them?
No. Your browser reads each picture, draws it and writes the new file on your device. You can check this by turning off your internet connection after the page has loaded.
Sources
- MDN: createImageBitmap(), how the browser decodes a picture file
- MDN: HTMLCanvasElement.toBlob(), the formats a browser can write
- W3C: Portable Network Graphics (PNG) Specification, third edition
Figures and text last checked on Tuesday, November 10, 2026.