Which format usually works best for photos?

JPEG (commonly saved with the .jpg or .jpeg extension — the same format) uses lossy compression tuned for continuous-tone photographic images, achieving strong file-size reduction while preserving the smooth color gradients and detail typical of photos, which is why it's the de facto standard for photographs on the web and in cameras. GIF is limited to a 256-color palette, making it poor for photos with millions of colors (it introduces banding), and PNG, while lossless and good for graphics/screenshots/transparency, produces much larger files for photographic content than JPEG's lossy compression. jpg (functionally identical to jpeg) is correctly marked as best for photos.

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