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PNG to JPG converter

Convert PNG files to JPG inside this page. No upload, no limit on how many, no watermark.

  • 0 uploads
  • No limits
  • No signup
  • Works offline

PNG and JPG, side by side

PNGJPEG
Released19961992
Compressionlosslesslossy
Transparencyyesno
Animationnono
Supporteverywhere, without exceptioneverywhere, without exception

What actually changes

The important detail is transparency: JPEG has no alpha channel, so transparent pixels have to become a colour. White is the default and usually correct, but if the logo is destined for a dark background you want to pick that colour instead, or the result will have a white halo.

PNG is a lossless format built around DEFLATE compression and a full alpha channel, released in 1996. Its real strength is that pixel-exact reproduction and true transparency, which makes it right for screenshots, logos and line art. The reason you are on this page is almost certainly the other side of that coin: file sizes several times larger than a lossy format when the content is photographic.

JPEG arrived in 1992 and is the format the web was built on, using discrete cosine transform compression tuned for photographs. It gives you universal compatibility — every device, browser, printer and form on earth reads it. The trade-off worth knowing about before you commit: no transparency, visible ringing around sharp edges and text, and a compression scheme three decades behind the state of the art.

How the conversion works here

Your file is decoded in a Web Worker inside this browser tab — by the browser's own image pipeline where it can, and by a WebAssembly build of libheif or libavif where it cannot. The decoded pixels are then re-encoded with MozJPEG, the same encoder Squoosh uses.

All of that happens on the processor in front of you. There is no upload step, no queue and no server, which is why there is no size cap, no daily allowance and no paid tier — and why the whole thing keeps working with the network switched off.

Doing more than one thing

Most people converting a format also need it smaller or a different size. The result screen hands your converted files straight to the compressor or the resizer in one click — no second download, no re-selecting files. If you need several formats, the general converter lets you pick the output each time.

How it works

  1. 01Add your PNG filesDrop them on the page, click to browse, paste from the clipboard, or drop a whole folder.
  2. 02Conversion runs on your deviceEach file is decoded and re-encoded as JPG by a WebAssembly codec in a background thread. Nothing is uploaded.
  3. 03Adjust if you need toMove the quality slider — 90 is visually indistinguishable from the source for most photographs.
  4. 04DownloadSave one file, or take the whole batch as a zip built on your device.

Questions people actually ask

Why convert PNG to JPG?
PNG is a lossless format built around DEFLATE compression and a full alpha channel. Its weakness is that file sizes several times larger than a lossy format when the content is photographic. JPEG gives you universal compatibility — every device, browser, printer and form on earth reads it, which is usually the reason people make this exact conversion.
Will I lose quality?
A little, unavoidably. PNG and JPEG are both lossy, so this is a re-encode. At quality 90 the difference is invisible at normal viewing size; drop below about 75 and it starts to show in skin tones and gradients.
What happens to transparent areas?
JPEG has no alpha channel, so transparent pixels have to be flattened onto a colour. White is the default; use the colour picker to choose something else if the image is going onto a coloured background.
Is there a file size or batch limit?
No. Nothing is uploaded, so there is no bandwidth to pay for and nothing to ration. The only ceiling is your own device’s memory.
Are my files uploaded?
No. Open your browser’s developer tools, watch the Network tab, and convert something — no request carries your file. The counter in the page header measures the same thing continuously.
Where is JPEG supported?
Everywhere, without exception. JPEG arrived in 1992, and no transparency, visible ringing around sharp edges and text, and a compression scheme three decades behind the state of the art.

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