Why convert JPG to PNG?
JPG is the de facto format for photos because it compresses heavily, but the price is lossy compression — every save discards some image information. PNG is lossless: it preserves every pixel exactly. Converting JPG → PNG does not recover what JPG threw away, but it stops the bleeding for any further editing or re-export.
JPG vs PNG: when each wins
| JPG | PNG | |
|---|---|---|
| Compression | Lossy | Lossless |
| File size on photos | Small | 2–5× larger |
| File size on flat graphics | Larger, blocky artifacts | Small, crisp |
| Transparency | No | Full alpha |
| Re-edit safe | Loses quality each save | No generational loss |
| Best for | Photos for web delivery | Editing master, screenshots, UI assets |
How to convert JPG to PNG
- Drop your JPG / JPEG files — drag onto the upload zone, click to browse, or paste from clipboard. Up to 30 at once.
- Click Convert — decoding and re-encoding happen locally with the Canvas API. Your files stay on your device.
- Download — one by one, or all at once as a ZIP.
What you should not expect
- Quality recovery. JPG artifacts (block noise, color banding, edge halos) are baked into the pixels. PNG faithfully preserves them — it does not undo them.
- Smaller files. PNG output on photos is typically 2–5× larger than the source JPG. That is the price of lossless storage on noisy content.
- Automatic transparency. JPG has no alpha channel, so the resulting PNG has an opaque background. You need an editor to add transparency.
When PNG actually wins on size
If your source JPG is a screenshot, diagram, UI mockup, or any image with large solid-color areas, PNG will often produce a smaller file than the JPG. JPG handles smooth gradients well but is terrible at hard edges and flat colors — exactly where PNG's zip-style compression shines. If you have a flat graphic that was saved as JPG, PNG is usually both smaller and sharper.
Privacy
Every byte stays in your browser. No upload, no temporary server file, no log. The conversion runs in a <canvas> element using the browser's built-in PNG encoder.