Convert JPG to PNG

Converting JPG to PNG is a counterintuitive operation — you are moving from a smaller lossy format to a larger lossless one. The conversion does not recover detail lost during JPG compression; instead, it preserves the current pixel state in a lossless container. The resulting PNG will be 3-8x larger than the source JPG because DEFLATE compression cannot match DCT-based lossy compression for photographic data. A 300KB JPG typically becomes a 1.5-2.4MB PNG, so this conversion only makes sense for specific technical workflows.

The primary use case is when you need to edit an image through multiple save cycles. Each time a JPG is re-saved, additional quality is lost through generation loss — re-encoding compounds quantization errors. Converting to PNG first creates a stable lossless working copy. Graphic designers frequently convert client-supplied JPGs to PNG before compositing them with text, logos, or transparent overlays in tools like Figma or Photoshop, then export the final composite in the appropriate delivery format.

Another critical use case is when you need transparency support. JPG has no alpha channel, but after converting to PNG, you can add transparency through masking or background removal. This workflow is standard in product photography: shoot in JPG for smaller raw files, convert to PNG, remove the background, and export with transparency intact. The resulting PNG with alpha channel typically weighs 2-4x more than the original JPG but enables flexible placement on any colored or textured background.

Print and archival workflows also benefit from JPG-to-PNG conversion. While TIFF is the traditional archival format, PNG offers comparable lossless quality with better software compatibility and smaller file sizes. Converting scanned documents from JPG to PNG prevents further degradation during institutional archiving. Museums and libraries increasingly accept PNG as a preservation format, and the ISO has standardized PNG (ISO/IEC 15948) for this purpose.