Turn PNG files into JPG in your own browser

PNG is a lossless format: it keeps every pixel of the image, stores full transparency and opens in every browser[1]. W3C approved the third edition of the specification on 24 June 2025. It describes lossless storage by the deflate method, 8 or 16 bits per colour channel, an alpha channel and APNG animation[2].

JPG, also written as JPEG, is described by the ISO/IEC 10918 standard from 1992[3]. It stores an image lossily, has 8 bits per colour channel and holds no transparency, and every version of Chrome, Edge, Firefox, Opera and Safari opens it[1]. Windows has a built-in codec for it[4].

Turning PNG into JPG makes sense when the image needs no transparency and weighs too much: for photographs our measurement puts the file at a little over a tenth of its original weight. With sharp-edged graphics and text it can go the other way, as the table below shows.

1. Drag your files onto the Add files area, or click it to pick them from your disk. Any number of PNG files is fine, each up to 100 MB.
2. Set the Set JPG quality slider between 60 and 95 percent; it starts at 85 and the current value sits beside its name.
3. Click Convert. Every finished file gets the Done status.
4. Save one file with Download, or all of them with Download all, which packs several into a ZIP archive. Only the extension changes, to .jpg.

The queue shows every file with its Before and After weight, the difference in percent, and the batch totals.

Move the slider and finished files go back to Pending, so the next Convert saves them at the new value.

Remove takes one file out of the queue, Clear all empties it.

Everything happens in your own browser: the PNG file is read by an image element, and the browser itself saves the JPG.

With photographs the difference is large: the landscape photo at 1920 × 1280 pixels went from 3.06 MB to 370.3 KB, which is 8.5 times smaller. The reason sits in how the formats work: PNG stores every pixel without loss, while JPG splits the image into blocks and drops part of the information the eye cannot separate[3].

On files that PNG packs well, the swap gives little or hurts. The screenshot with text (1440 × 900) came out 10 percent smaller, the icon with transparency at 256 × 256 pixels came out 31 percent larger, and the text page, as from a scanner came out 20 percent larger. Graphics with large flat areas and sharp text are material where PNG belongs, and where JPG adds its own artefacts along the edges.

The Set JPG quality slider changes the file weight more than anything else, and the pixel dimensions stay as they were in the source file. You set smaller ones in the Helios editor. If you need transparency, pick the PNG to WebP converter or the PNG to AVIF converter.

A transparent background from a PNG file comes out white in the JPG, and semi-transparent pixels are blended with white. That is how the format works: JPG has no alpha channel. If the background has to stay transparent, you need a different target format.

EXIF data does not reach the JPG file, so the date, the device model and the coordinates of the place disappear with it. The orientation stored in that data is applied, so a rotated photo comes out rotated. Every JPG from our converter carries an sRGB colour profile, and the colour is stored on 8 bits per channel[1].

JPG compression cannot be undone, so it is worth keeping the PNG originals for the next conversion. A file lighter than a JPG at the same content usually comes from the PNG to WebP converter, and you assemble a page with several images in the PNG to PDF converter.