Convert JPG to PNG

Free, in your browser — your image never leaves you. PNG is lossless; the file size grows.

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RoundCut converts JPG to PNG entirely in your browser using the platform's native image encoder. The file is never uploaded. PNG output is lossless, so no new quality is lost, but JPG artifacts already in the source are preserved. The resulting PNG is typically three to seven times larger than the source JPG.

How to convert JPG to PNG

Drop a JPG file on the upload area (or click to pick one). The conversion runs the moment the file lands — there is no "Convert" button to chase. When the result is ready, the stats line shows the input and output size, and the Download button saves the PNG to your device. One file at a time; batch is planned for a later release. Every step happens locally in your browser, so even very large desktop files convert without a network round-trip. JPEG inputs with either the .jpg or .jpeg extension work the same way, and GIF or WebP inputs are also accepted as alternative sources.

Why PNG files are larger — and what that means

JPG achieves its small size by discarding pixel data; PNG keeps every pixel. Re-encoding a lossy JPG into a lossless PNG therefore produces a bigger file — typically three to seven times the original. A 17 KB JPG becomes about 105 KB; a 116 KB JPG becomes about 384 KB. This is expected, not a bug, and it is true of every PNG converter in existence because PNG is defined by its lossless container. If the smaller size matters more than the lossless container, stay on JPG, or compress the PNG afterwards with a dedicated tool. The conversion is the right step only when you need PNG features such as repeated editing without re-compression.

PNG or JPG — when to use each

Switch to PNG for logos, icons, screenshots with sharp text, line art, or anything that needs transparency or repeated editing. Keep JPG for photographs, hero images on a webpage, and uploads to social platforms that recompress JPG anyway. The general trade is size against editability: JPG wins on bytes, PNG wins on quality preservation across multiple saves. Converting from JPG to PNG before you edit prevents each save from adding fresh compression artifacts, which is the main reason graphic designers move photos into PNG during a multi-step workflow. For final delivery on the web, convert back to JPG once editing is done.

Quality and file size

The PNG output is lossless — no new quality is lost in the conversion itself. What converting does not do is restore quality already lost during the original JPG compression. Any artifacts, banding, or softening baked into the JPG stay in the PNG exactly as they appear. PNG simply stops further degradation: once in PNG, every save preserves the current pixels. There is no quality slider because PNG has nothing to tune — it is lossless by definition. If you want a smaller PNG, compress it after conversion; if you want a sharper source image, you need to start from a higher-quality original, since no converter can recover what JPG already threw away.

Your privacy

The conversion runs in the browser's native image engine. Nothing is uploaded, nothing is logged, nothing is queued on a server. If you open DevTools and watch the Network panel while you convert, you will see zero outbound image requests. The same code path runs on every browser — there is no server fallback that activates for larger files or specific formats. Free, no signup, no watermark, and no account required to download the result. Because the entire pipeline is client-side, the tool also works after the first page load even if your network drops while you are converting.

Frequently asked questions

Does converting JPG to PNG improve quality?

No. The conversion does not restore quality lost during the original JPG compression. The PNG output preserves the current pixel state exactly, including any existing artifacts. What converting stops is further quality loss: once the image is PNG, you can edit and re-save without adding new compression damage on every save. The PNG output is lossless; the JPG source was not.

Why is my PNG file larger than the original JPG?

PNG stores every pixel without lossy compression — it is lossless by design. A JPG achieves its small size by discarding image data; PNG keeps all of it. A 17 KB JPG typically becomes a 100 KB or larger PNG, and a 116 KB JPG can grow to nearly 400 KB. This is expected behavior, not an error. If file size matters more than lossless quality, use a compress tool afterwards.

Does converting JPG to PNG create a transparent background?

No. Converting changes the container format but preserves the pixel content — your solid background stays solid. The output PNG supports transparency as a format, but it contains no transparent pixels unless you remove the background separately. For a true transparent PNG, use the RoundCut bg-remover tool after converting, which isolates the subject and clears the background pixels for you.

Is it safe to convert here? Does my image get uploaded?

Your file never leaves your browser. The conversion runs entirely on your device using the platform image engine — no upload, no server, no data collection. You can verify it with DevTools open: there are zero outbound image requests during the conversion. The same client-side code path runs on every browser, with no server fallback to leak the file.

Can I convert multiple JPG files to PNG at once?

Not yet — the current version converts one file at a time. Batch conversion is planned for a later release. If you have many files to process, you can convert them sequentially in the same tab without reloading the page; each conversion runs locally and frees the previous file from memory once you download it.

Does the conversion remove EXIF metadata?

Yes. The encoder strips EXIF, IPTC, and XMP metadata during the canvas re-encode. ICC color profile is sometimes preserved depending on the browser (Chrome and Safari tend to keep it, Firefox strips it), so sRGB is safe but other profiles are not guaranteed. If EXIF or a specific color profile matters, edit the metadata before converting using a dedicated tool.

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