PNG to JPG Converter

This tool converts PNG images to JPG (JPEG) in your browser. People usually do it for one of two reasons: a website, form or email limit wants a smaller file, or a system only accepts JPG. Screenshots and photos exported as PNG are often several times larger than they need to be, and JPG is the standard fix.

The size difference comes from how the two formats compress. PNG is lossless — it stores every pixel exactly — which is ideal for screenshots, diagrams and logos with flat colour and sharp text, but expensive for photographs. JPG is lossy: it discards fine detail the eye is least likely to miss, and for a photo that routinely makes the file a fraction of the PNG's size. For a screenshot full of text and flat colour the saving is smaller, and JPG can add faint smudges (artefacts) around sharp edges; for that kind of image, PNG is often the better format to keep.

When you click Convert to JPG, each file's first eight bytes are checked for the PNG signature, so a file that is really a JPG or WebP with a .png name is caught and named. Your browser decodes the PNG, fills a canvas of the same size with your background colour, draws the image on top and encodes the result as JPG at the quality you set — 92 out of 100 by default, where the loss is very hard to see. The results list shows each file's size before and after, so you can see what you saved; if a JPG comes out larger (possible for tiny or very simple images), it is shown as larger, not hidden.

The trade-off to understand is transparency. PNG can have see-through pixels; JPG cannot. Every transparent or semi-transparent pixel is blended onto the background colour you pick — white unless you change it. That is exactly right for putting a logo on a white document, and wrong if you need the cut-out shape to stay transparent: in that case keep the PNG, or compress the PNG instead of converting it. An animated PNG (APNG) keeps only its first frame, and the tool says so.

Nothing leaves your device. The files are read into your browser's memory, converted and offered back as downloads; you can confirm in your browser's developer tools (Network tab) that no request carries your image. Up to 50 files per batch, each up to 50 MB, downloadable individually or as a ZIP.

1. Each file's first eight bytes are checked for the PNG signature (89 50 4E 47 0D 0A 1A 0A). Anything else is rejected with a message naming what the file really is. 2. The chunks before the image data are scanned for an acTL chunk; if one is present the PNG is animated and you are told only the first frame is kept. 3. Quality (1–100) and the background colour (hex) are validated; quality is converted to the 0–1 scale the browser's encoder takes. 4. The browser decodes the PNG at full size. A canvas of the same dimensions is filled with the background colour and the image is drawn over it, so transparency blends onto that colour. 5. The canvas is encoded with canvas.toBlob("image/jpeg", quality), and the file is named after the original with a .jpg extension. Sizes before and after are shown per file.