JPEG and PNG are both common image formats, but they are optimized for different kinds of visual information. Choosing between them is less about which format is “better” and more about what your image contains and how it will be used.

The short version

JPEG is usually a strong choice for photographs and other images with many colors and gradual changes in tone. PNG is often better for interface graphics, diagrams, screenshots and images that need transparency or lossless storage.

Why JPEG files are often smaller

JPEG uses lossy compression. It reduces file size by discarding some visual information, especially detail the compression model expects people to notice less. At moderate quality settings the result can look very close to the original while using substantially less storage than an uncompressed image.

The trade-off is that saving a JPEG repeatedly can introduce artifacts. Fine text, hard edges and flat-color graphics can show ringing or block-like distortion sooner than photographs do.

Why PNG preserves edges and transparency

PNG uses lossless compression, so it can reproduce the encoded pixels without the kind of quality loss introduced by JPEG compression. It also supports alpha transparency, which makes it useful for logos, icons, overlays and interface assets.

Lossless does not automatically mean “better.” A large photographic PNG can be far heavier than a visually similar JPEG or WebP file.

When to use each format

  • Photos: JPEG is often the practical default when compatibility matters.
  • Screenshots with text: PNG often keeps edges cleaner.
  • Transparent graphics: PNG is the safer traditional choice.
  • Archival editing: PNG can avoid additional lossy compression, although professional workflows may use other formats.

Does converting JPEG to PNG restore quality?

No. PNG can store the current pixels without adding more JPEG loss, but it cannot reconstruct image information that was discarded when the JPEG was created. The converted PNG may also be larger without looking better.

Practical rule

Match the format to the content. Use JPEG when compact photographic images and broad compatibility matter. Use PNG when transparency, crisp synthetic graphics or lossless pixel storage matter more than file size.