Image Format Converters
Change an image from one format to another. Useful when a marketplace rejects your file type, or when you want the smaller file a modern format gives you.
- PNG to JPGTurn PNG files into JPGs, with control over the quality and over which colour replaces any transparent areas.
- JPG to WebPConvert JPEG photos to WebP, the format that gives you the same visual quality in a noticeably smaller file.
- HEIC to JPGConvert the HEIC photos your iPhone produces into JPGs that everything can open.
Choosing a format
Format choice is mostly determined by what the image contains, not by preference. Getting it right often saves more than any compression setting.
| Format | Best for | Transparency | Lossy |
|---|---|---|---|
| JPG | Photographs; anywhere maximum compatibility is required | No | Yes |
| PNG | Logos, screenshots, diagrams, anything needing transparency | Yes | No |
| WebP | Websites — smaller than both, with either mode available | Yes | Either |
| HEIC | Nothing, outside an Apple device — convert it | Yes | Yes |
The two conversions that lose something
Most conversions are reversible in principle. Two are not, and both are easy to do by accident.
PNG to JPG destroys transparency. JPG has no alpha channel, so transparent areas must be filled with a solid colour, and that choice cannot be undone. Converting back to PNG produces a larger file with a permanent coloured background. The converter lets you choose that colour deliberately.
Any lossy-to-lossy conversion compounds damage. Converting a JPG to WebP decodes an already-compressed image and compresses it again. The effect is usually invisible, but convert from your highest-quality original where you can.
Where each format is accepted
Compatibility, not quality, is what usually forces a conversion. Marketplaces — Etsy, Amazon, eBay, Shopify — expect JPG or PNG and generally reject WebP. Use WebP on your own website, where you control the hosting and page speed matters.
HEIC is rejected almost everywhere outside Apple's ecosystem, which is why converting iPhone photos is the most common conversion people need. That page also explains how to stop your phone producing HEIC in the first place.