▮ Private Converters

Converter · No upload

PNG to JPG, privately

Drop in PNGs and download compact JPGs at the quality you choose. The conversion runs entirely inside your browser — nothing is uploaded, the network meter below proves it live, and it works with your wifi off. Transparency is flattened onto white, because JPG has none.

Statusidle Files— OutputJPG Network since file read—

How this converter works

Your browser decodes PNG natively — no extra code is needed. When you choose a file, the File API opens it in memory, the browser turns it into raw pixels, and this page draws those pixels onto a canvas that has first been filled white, so transparent regions land on a clean background instead of JPG's default black. The canvas then re-encodes to JPG at the quality you set on the dial, and the result comes back as a download link. Every step runs in the tab; this site has no server that could receive a file.

The readout's network meter arms the instant your first file is read and counts every request from that moment — it stays at zero, in green. For independent confirmation, watch the developer-tools Network tab stay silent while converting, or switch on airplane mode and convert anyway: after one visit this page is cached and works entirely offline. The methodology page walks through each verification.

The honest limits: JPG's savings come from discarding detail, and that loss is irreversible — keep your PNG originals for anything that matters. Sharp edges, text, and flat-color graphics show JPG artifacts soonest; photographs tolerate compression best. Transparency cannot survive the trip (flattened onto white, as disclosed), and re-encoding strips metadata from the output — including PNG text chunks and any embedded location data.

Frequently asked questions

Is my image uploaded anywhere?
No. Your browser decodes the PNG itself, redraws it on a canvas inside this tab, and re-encodes it as a JPG — all in memory, on your device. The readout's network meter counts every request from the moment your file is read and stays at zero, and the methodology page shows how to verify that independently.
What happens to transparent areas?
They're flattened onto a white background, because JPG has no transparency at all — every JPG pixel must be a solid color. If you need the transparency kept, stay in PNG or use WEBP; converting to JPG inherently gives it up.
What quality setting should I use?
The default 0.92 is visually indistinguishable from the original for most images while cutting the size substantially. Go higher for images you'll edit again; as low as 0.7 is usually fine for casual sharing. Text and sharp-edged graphics show JPG artifacts first — if your PNG is a screenshot or diagram, inspect the result before deleting anything.
Why is the JPG so much smaller?
JPG is a lossy format: it spends detail to save space, discarding information your eye is least likely to miss. PNG keeps everything. That's the entire trade — smaller files, slight irreversible loss. Keep the PNG original if the image matters.
Is metadata kept in the JPG?
No. Re-encoding through a canvas strips metadata from the output — for PNGs that includes text chunks and any embedded location or creation data. For images you're about to share, that's a privacy feature.

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