Convert JPEG to PNG (JPEG to Portable Network Graphics)

Convert JPEG to PNG. This tool takes a JPEG and re-encodes its pixels as a lossless Portable Network Graphics. What this does NOT do is recover detail that JPEG already discarded: the source was lossy, so the PNG you get back is a pixel-exact snapshot of the already-compressed image, not a higher-quality original.

PNG (Portable Network Graphics) is lossless: every pixel of the input is preserved exactly. It was standardised in 1996, supports an alpha channel, and is the universal editor-friendly format. Design tools (Photoshop, Figma, Affinity) import PNG without quality loss, which is why it is the right target when the next step is manual editing, layer compositing, or a transparent overlay.

JPEG (JPEG) is a lossy codec: its whole value is squeezing photographic content into a small file by discarding detail the eye is unlikely to notice. That compression is one-way. By the time a JPEG exists, the original high-frequency detail is gone forever and no subsequent format change can bring it back. This is the single most important fact about this direction.

The trade-off is size. PNG needs roughly 851% more bytes than JPEG for the same pixels, because it cannot compress by discarding perceptual detail. That is a feature of PNG, not a flaw. The upside is a file that survives round-trips through an editor with zero generation loss, unlike a JPEG that degrades slightly with every re-save.

When NOT to convert JPEG to PNG: when the destination is the public web (ship the JPEG directly or re-encode to a modern codec like AVIF or WebP). When you want "better quality" from the already-compressed source (you cannot get quality back). When the source already has a lossless master available: go back to the master, not through the JPEG.

Your JPEG upload is held only while we re-encode it. The resulting PNG comes back on a one-time download link and is deleted the moment you fetch it. Nothing is saved on our servers, and no account ties the upload to you. Converting JPEG to PNG on BouseMutton is a quiet one-shot snapshot, not a saved artefact.