Choosing a format
An image format is a way of storing the same picture, and each one makes different trade-offs. The right choice depends on what the image is and where it is going, not on which is “best”. Here is a quick guide to the formats this tool handles.
| Format | Strengths | Watch out for |
|---|---|---|
| JPG | Small photos, opens everywhere | No transparency; lossy, so repeated saving loses detail |
| PNG | Sharp graphics, text, screenshots, transparency | Photos become very large |
| WebP | Typically 25–35% smaller than JPG, supports transparency | Some forms, editors and print services do not accept it |
| HEIC | Half the size of JPG, the default on iPhones | Poor compatibility outside Apple’s world |
| AVIF | Very efficient modern format | Not accepted everywhere yet |
Common conversions
- [HEIC to JPG](/convert-heic-to-jpg). Make an iPhone photo openable anywhere.
- [PNG to JPG](/convert-png-to-jpg). Shrink a photographic PNG dramatically.
- [WebP to JPG](/convert-webp-to-jpg). Use a saved web image in software that does not support WebP.
- [JPG to WebP](/convert-jpg-to-webp). Make a website’s images lighter and faster.
What a conversion changes
Converting to a lossy format such as JPG or WebP is a single re-encode: the picture is decoded and saved again in the new format. At a high quality the difference is invisible, but it is not reversible, so keep your original. Converting a JPG to PNG will not restore detail that has already been discarded; it only wraps the same picture in a larger file. Transparency is the other thing to watch: JPG cannot hold it, so transparent areas are filled with white.
Convert and fit in one step
If the destination also has a size limit or exact dimensions, set them here and the file is converted and fitted in one pass, instead of passing it through several tools and degrading it each time. To pick a format with more confidence, read the JPG vs PNG vs WebP guide. Your files are processed in your browser and are never uploaded.