Image Converter — PNG, JPEG, WebP

PNG, JPEG and WebP: which format to pick

JPEG is the default for photographs: small files, no transparency, blocking artefacts if you push quality too low. PNG is the default for screenshots, UI, logos and anything with a sharp edge or an alpha channel. WebP can do both lossy photos and lossless graphics, and is now supported in every current desktop and mobile browser.

Converting PNG → JPEG is a one-way trip for transparency: missing pixels are filled with white. JPEG → PNG rarely shrinks a photo; it just wraps the same pixels in a lossless container. PNG → WebP (lossy or via this tool’s quality slider) is often the biggest win for graphics that still need to stay reasonably sharp.

This converter redraws the bitmap through canvas, so it is not a lossless container remux. Metadata (EXIF, colour profiles) is not copied. That is usually what you want for the web, and it is why a “converted” JPEG may look slightly different from a hex-identical rewrap.

If a browser cannot encode WebP, the tool falls back to JPEG so you still get a download. Check the reported output type on the stats row.

Nothing is uploaded. Use the compressor if you also need to cap dimensions in one step.

What the converter does

Any image your browser can decode — JPEG, PNG, WebP, GIF, BMP or SVG — is drawn onto a canvas and saved as JPEG, PNG or WebP. The pixel dimensions stay the same. For JPEG and WebP the quality slider sets the compression; PNG is lossless. Converting to JPEG fills transparent areas with white, because JPEG cannot store transparency.

Common conversions

• PNG → JPEG: for photographs saved as PNG by a screenshot tool or phone app. Usually a large size saving.
• JPEG → PNG: does not improve quality — the JPEG artefacts are preserved exactly, in a bigger file. Only convert if a tool requires PNG.
• Anything → WebP: typically 25–35% smaller than JPEG at similar visual quality, with transparency support. Good for websites.
• WebP → JPEG or PNG: when an older app, printer service or form will not accept WebP.
• SVG → PNG: rasterises a vector logo at its intrinsic size for places that do not accept SVG.

Formats this tool cannot write

GIF animation, ICO, AVIF, HEIC and TIFF are not output options. For favicons, use the favicon generator, which writes a real multi-size .ico. iPhone HEIC photos can be opened only in browsers that decode HEIC, mainly Safari; on other browsers, export them as JPEG from the Photos app or set the camera to “Most Compatible”.

What changes in a conversion

• Each lossy save loses a little detail, so convert from the best original you have, not from a previously compressed copy.
• Metadata such as EXIF camera data and GPS location is not carried into the new file.
• Embedded colour profiles are not preserved; images are saved as standard sRGB, which is what web browsers expect.

Picking a quality setting

The default of 85% is a safe choice for photos in either JPEG or WebP. Go to 90–95% for images that will be edited again or printed, and 70–80% for web pages where load time matters. Below about 60%, blocky artefacts appear in smooth areas such as skies. The before-and-after sizes appear after each conversion, so try two settings and keep the smaller file that still looks right. Always keep your original: converting back and forth between lossy formats loses a little more detail each time.