Convert image
Switch an image from one format to another in seconds: PNG, JPG, WebP or AVIF, even starting from iPhone HEIC photos. Without uploading anything anywhere.
JPG, PNG, WebP, GIF, BMP, AVIF or HEIC (iPhone)
Which format should you pick?
JPG is the universal choice for photos: small files that open anywhere, but no transparency. PNG keeps every pixel intact and supports transparent backgrounds, perfect for logos and graphics, at the cost of larger files. WebP is the modern web format: up to 30% smaller than JPG at the same visual quality, and supported by every current browser.
A note about transparency
When you convert a PNG with a transparent background to JPG, the transparency is replaced with solid white, JPG simply doesn't support it. If you need to keep the transparent background, choose PNG or WebP as the output format.
The two families of formats
On one side the lossy formats, JPEG and to a degree WebP and AVIF: they throw away information the eye barely notices, and that is why they weigh little. On the other the lossless formats, PNG, GIF, TIFF and BMP: they keep every pixel exactly as it was, and weigh far more on a photograph.
The rule that follows is simple: photographs lossy, graphics lossless. A photo in PNG weighs five or ten times an equivalent JPEG without gaining anything visible; a screenshot in JPEG goes blurry around the letters and is not even lighter.
What is never recovered
Converting from a lossy format to a lossless one does not give back the lost quality: from a JPEG to a PNG you get a bigger file with exactly the same flaws. It is the commonest mistake, and the one that leads people to archive photographs in PNG believing they are preserving them.
And every hop between two lossy formats recompresses from scratch: the second compression discards things the first had already left on the edge. The right way to work is therefore always to start from the original, make all the edits, and convert once only at the end.
The special cases that surprise people
The transparency: converting a transparent PNG to JPEG turns the background white or black, and there is no way back. If the file has to be transparent, the formats are PNG and WebP. Animation: an animated GIF converted to PNG becomes a single frame, and which one depends on the software.
The colour profile: an image saved in Adobe RGB and converted without carrying the profile comes out with dull colours, and it is the classic cause of photos that look faded on the web compared with how they appeared in the editor. For the web the safe choice remains sRGB.
WebP and AVIF, and when to use them
These are the two modern formats: at the same quality they weigh twenty to fifty per cent less than a JPEG, and they handle both transparency and animation. For a website they are the right choice, and every browser now opens them.
Outside the browser, though, support is still uneven: many upload forms, older graphics programs, printers and televisions do not accept them. The practical rule is WebP for the web, JPEG for anything that has to travel: when a file has to be attached to an application or handed to someone else, the universal format is worth more than the handful of kilobytes saved.
Nearby tools
For size there are Compress image and Compress to a target size, for dimensions Resize photo. For specific cases HEIC to JPG, SVG to PNG and PDF to images.