Choosing and Converting Image Formats
What this converter does
Every image format is a different way of encoding the same pixels. JPEG squeezes photographs into small files by discarding detail the eye barely notices, PNG keeps every pixel exactly and supports transparency, and newer formats like WebP and AVIF push compression further while still handling an alpha channel. This tool decodes an image you upload and re-encodes it into a format you choose from those your browser can save — usually JPEG, PNG, and WebP, plus AVIF where it is supported — using your browser to read and rewrite the pixel data.
Because the source is fully decoded before it is written back out, the converter produces a genuine re-encoding in the target format — not just a renamed file with a new extension.
When to use it
The most frequent reason is trimming page weight. A photo saved as PNG or an oversized JPEG can often be re-encoded as WebP or AVIF at a fraction of the size with no visible difference, which speeds up loading and improves Core Web Vitals. The reverse is just as common: an AVIF or WebP file downloaded from the web may not open in older editors, print pipelines, or messaging apps, so converting it back to JPEG or PNG restores compatibility.
It also helps when you need a flat JPEG for an email attachment or a PNG for a logo that must sit on any background. A BMP, GIF, or TIFF from a scanner or older software can be opened here too and saved as JPEG or PNG, as long as your browser can read it.
Example: PNG to WebP
Say you have a 1.2 MB PNG logo with a transparent background. Select WebP as the output format and adjust the quality slider — around 80 usually keeps the artwork crisp. The result is typically a few times smaller while the transparent areas stay transparent, because WebP carries an alpha channel just as PNG does. The result panel lists the file size before and after, so you can see exactly how much you saved — or whether the output ended up larger than the original.
Transparency, quality, and support
Transparency only survives in formats that support an alpha channel. When you convert a transparent PNG to JPEG, which cannot store transparency, the background-colour control fills those areas with a solid colour of your choosing instead of leaving them black. Lossless formats such as PNG preserve every pixel, while JPEG, WebP, and AVIF are lossy — the quality slider trades file size against visible detail. AVIF gives the strongest compression but its encoding depends on the browser, so support is narrower than WebP. Uploads are capped at 10 MB per image.