Convert JPEG to PNG — Free Online Converter

JPEG uses DCT-based lossy compression that discards subtle image details to achieve small file sizes, while PNG uses lossless deflate compression that preserves every pixel exactly. Converting JPEG to PNG decodes the DCT-compressed data and stores it in PNG's lossless format, ensuring no further quality degradation occurs if the image is subsequently edited, saved, or processed.

This conversion is essential for design and editing workflows. When you open a JPEG in an editor and save it again as JPEG, quality degrades with each save cycle (generational loss). Converting to PNG first breaks this cycle — edits can be saved repeatedly without any additional quality loss.

PNG is the standard working format for graphic design, UI development, and any workflow where images are edited repeatedly. Unlike JPEG, saving a PNG multiple times does not degrade quality. If you need to edit a JPEG photograph — adding text, adjusting colors, compositing with other elements — converting to PNG first preserves the current quality through all subsequent edits.

PNG also supports alpha channel transparency, which JPEG lacks entirely. If you need to add a transparent background to a JPEG image (for website overlays, app icons, or design compositing), converting to PNG is the necessary first step because the format can represent per-pixel transparency.

Sharp decodes the JPEG file using libjpeg-turbo, applying EXIF orientation and ICC color profiles. The decoded RGB pixel buffer is compressed using PNG's deflate algorithm with configurable compression level (1-9). Level 6 provides the best balance of file size and encoding speed. The output PNG preserves the exact decoded pixel values from the JPEG source. ICC profiles are embedded in the PNG output when available.