JPG to PNG Converter — Free Online, Lossless

Converting JPG to PNG Makes Files Larger, Not Better

The most important thing to know: converting a JPEG to PNG does not improve image quality and usually makes the file significantly larger. JPEG compression discards image detail permanently to shrink the file. Once that detail is gone, it stays gone. When you convert to PNG, you are storing those same damaged pixels—just in a lossless format that cannot compress them as aggressively. The result: a bigger file with identical visual appearance.

JPEG Discards Detail Permanently; PNG Cannot Restore It

JPEG uses lossy compression, which throws away color information the human eye usually cannot see. This shrinks the file dramatically. PNG uses lossless compression, which preserves every pixel exactly. For a photograph already compressed by JPEG, PNG's compression is ineffective; it stores all that photographic noise and gradients without removing anything. The outcome is predictable: PNG files are often 2–5 times larger than the original JPEG, with no quality improvement to show for it.

When This Conversion Is Actually Worth Doing

Despite the size penalty, converting JPEG to PNG makes sense in specific situations. You need transparency: PNG has an alpha channel for transparent backgrounds; JPEG does not. You are handing files to a design pipeline that requires PNG. You want a stable working copy so repeated save cycles stop degrading the image—every JPEG re-save loses detail, while PNG preserves it perfectly. You need exact pixel documentation for screenshots or specifications.

This Tool Admits the Real Cost

This converter shows original and new file sizes side by side, highlighting in amber when the PNG is larger—which it usually is. That honesty is rare. The tool also offers optional resize and filename prefix options, but resizing will not restore any quality lost to JPEG compression. For lossy alternatives, explore JPG to WebP, which compresses more efficiently, or see how PNG to JPEG works in reverse.