Every transparent pixel is composited onto the background colour you pick, and that is irreversible. Converting the result back to PNG afterwards gives you an opaque image with a coloured rectangle where the transparency used to be.
PNG to JPEG converter
Flatten a PNG into a JPEG every tool will accept — onto a background colour you choose, rather than the black one you get by accident.
- Free, no signup
- Runs in your browser
- Nothing uploaded
- JPEG cannot store transparency. Pick a fill colour below — leave it alone and transparent areas become white instead of black.
- Fine text and hard edges are where JPEG shows its seams. Raise the quality dial if the PNG is a UI screenshot.
Convert to
Why this conversion
When PNG to JPEG is the right move
The usual reason to go this direction is not file size, it is the receiving end. Older upload forms, print workflows, some CRMs and a surprising number of internal tools accept JPEG and nothing else. PNG is also a poor fit for photographs — a photo saved as PNG can be five times the size of the same photo as JPEG at a quality most people cannot pick out in a blind comparison.
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The catch is transparency. JPEG has no alpha channel whatsoever, so a transparent PNG has to be flattened onto something first. Left to its own devices a canvas paints those pixels black, which is how logos end up sitting on a black rectangle. This tool asks you for the fill colour instead and starts on white.
Reach for it when
- Something downstream rejects PNG outright.
- The image is a photograph, where JPEG's compression model actually fits the content.
- You are attaching the file to an email or a form with a hard size limit.
The trade-off
What you gain and lose going PNG to JPEG
JPEG compresses in 8×8 blocks and struggles with sharp contrast boundaries. On a screenshot of code or a UI you will see ringing around the letters. On a photograph you will see nothing at all.
This conversion is one-way. Once the detail is thrown out it cannot be recovered, so hold on to the original if the image will ever be edited again.
How it works
Converting PNG to JPEG, step by step
1Choose your PNG file
Browse or drop it onto the panel. Up to 25 MB. The file is decoded by your browser and is never uploaded anywhere.
2JPEG is already selected
The target is preset to JPEG for this conversion. Only formats your browser can genuinely encode are offered, so nothing hands you a renamed PNG.
3Set quality and background
JPEG is lossy and cannot store transparency, so the dial trades size against detail and the colour picker decides what fills any transparent areas.
4Compare, then download
Original size, converted size and the percentage difference are all shown before you commit — including the cases where converting makes the file bigger.
PNG to JPEG questions
Pick a question to see the answer.
Because most converters composite onto an empty canvas, and an empty canvas is transparent black — flattened to JPEG that reads as solid black. This page exposes the fill colour so you decide, and defaults it to white.
None. They are the same format; the three-letter extension is a leftover from filename limits on early DOS systems. Files here are saved with a .jpg extension because it is the more widely expected of the two.
That is what the quality dial controls. Around 80 percent is the usual sweet spot — most of the size saving, none of the visible mush. Below roughly 60 percent the block structure starts becoming visible on flat areas.
Related conversions
Other formats, same converter
PNG to WebP
Cut a screenshot or logo down to a fraction of its size without losing the alpha channel.
JPEG to PNGStop the generation loss before you start editing a JPEG.
WebP to JPEGConvert a WebP into the format almost nothing rejects.
Every format in one toolThe general image converter, with all the formats your browser can write and the same size comparison before you download.
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