JPG to PNG Converter — Free, Lossless, No Upload

JPEG is a lossy format — it achieves small file sizes by permanently discarding image information. PNG is lossless — every pixel is stored exactly, with no quality reduction. Converting JPEG to PNG won't recover detail that JPEG already discarded, but it does stop any further degradation.

The main reasons to convert JPG to PNG: you need transparency support (JPEG doesn't have it), you're going to edit the image through multiple save cycles and don't want quality to degrade with each one, or you need to use the image on a platform that specifically requires PNG.

JPEG artifacts become more visible every time you re-save a file in JPEG format. If you're doing any multi-step editing — compositing, adding text overlays, creating mockups, retouching — switching to PNG after your first edit stops that compression cycle from compounding.

A converted JPG-to-PNG will be noticeably larger in file size than the original JPEG. That's expected and fine if you're editing. It's a problem if you're trying to reduce file size — in that case, stay with JPEG or try WebP.

The key thing to understand: converting JPG to PNG is lossless from here on, but it cannot undo compression the JPG already applied. JPG is a lossy, 8-bit format — any blocky artefacts, colour banding, or blurred edges already baked into the JPG are preserved exactly in the PNG, not cleaned up. What you actually gain is stability: PNG is lossless, so you can open, edit, and re-save it endlessly with zero further degradation, unlike a JPG that loses a little each save.

File size goes the other way. Because PNG never discards detail to shrink, a PNG of the same photo is usually 3–5× larger than the JPG. That is the price of a lossless master.

Colour and transparency: PNG supports up to 16-bit colour and a full alpha channel, which makes it the right container for sharp text, screenshots, and line art. A JPG has no transparency to carry over, so the PNG arrives on a solid background — you would add any transparency afterwards in an editor.