Why did my transparent background turn black?

JPEG cannot store transparency, so those pixels had to become a colour and the converter chose one. Set the background explicitly — white is usually what was wanted.

How much smaller will the file be?

For a photograph, often five to ten times. For a screenshot or a logo it may get larger, and will certainly look worse.

Can I convert back afterwards?

You can, but the quality does not come back. JPEG discards data permanently; converting to PNG afterwards preserves the reduced version.

Is there a better option than JPEG?

WebP, usually — smaller than JPEG at the same quality and it keeps transparency, so the background question does not arise.

PNG to JPG Converter

Converts a PNG to JPEG, usually to make a photograph dramatically smaller — with a choice of what transparent areas become.

Runs in your browser — nothing is uploaded

Your image

Drop an image here

or choose a file — it never leaves your browser

Re-encoding is generationally lossy for JPEG and WebP — each pass loses a little detail. Always work from the original rather than re-processing a result.

Result

Your processed image appears here.

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Why use it

Built to be genuinely useful

Large savings on photographs

A photograph stored as PNG is typically several times larger than it needs to be. This is the conversion that fixes it.

You choose the background

JPEG has no transparency, so transparent pixels must become some colour. Picking it beats discovering that it defaulted to black.

Nothing is uploaded

The image is decoded and re-encoded by your browser. It never reaches a server, which matters for anything with a face, a document or a location in it.

Free, no watermark

No account, no queue, and nothing stamped across the result.

How it works

Three steps

1
Open the PNG.
2
Choose the quality and, if it has transparency, a background colour.
3
Download the JPEG.

Transparency has to go somewhere

JPEG has no alpha channel, so every transparent pixel is replaced with something. The default in many converters is black, which is how a logo designed for a white page arrives as a white shape on a black rectangle.

Choosing the background is the fix, and the colour to choose is the one the image will sit on. If it needs to work on more than one background, JPEG is the wrong format for it — that requirement is precisely what transparency is for, and WebP keeps it while still being small.

When to keep the PNG

Screenshots, logos, diagrams and anything containing text should stay PNG. JPEG's compression works by discarding fine detail, and hard edges between two colours are exactly the fine detail it handles worst — text acquires a visible halo, and it does not go away.

The rule that covers nearly every case: photographs to JPEG, graphics to PNG. If an image contains both, decide by whichever dominates, or use WebP, which handles both reasonably.

FAQ

Questions people ask

API access

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