JPEG vs PNG: When to Use Each Format

Q: Is JPEG or PNG better for iPhone photos?

JPEG is better for photos because it produces much smaller files at high quality. PNG is best for screenshots, logos, graphics with text, and any image that needs transparency.

Q: Why are PNG files larger than JPEG?

PNG uses lossless compression, meaning every pixel is preserved exactly. JPEG uses lossy compression that discards visual information the eye is unlikely to notice, producing files 5-10 times smaller for typical photos.

Q: Does PNG support transparency?

Yes. PNG supports an alpha channel for transparency and partial transparency, which is why it is commonly used for logos, icons, and overlay graphics. JPEG does not support transparency.

JPEG uses lossy compression and is best for photographs, where small file sizes matter and minor pixel-level loss is invisible. PNG uses lossless compression and supports transparency, making it the right choice for screenshots, logos, icons, and any graphics with sharp edges or text.

JPEG: The Photo Format

JPEG (Joint Photographic Experts Group) was created in 1992 specifically for photographs. It uses a compression technique called Discrete Cosine Transform that discards visual information humans are unlikely to notice, producing files 5–10 times smaller than uncompressed images. Every save reduces quality slightly because compression is lossy, so JPEGs degrade with repeated edits.

PNG: The Graphics Format

PNG (Portable Network Graphics) was created in 1996 as a free, lossless replacement for GIF. It preserves every pixel exactly, supports millions of colors, and includes an alpha channel for transparency. PNGs can be re-saved infinitely without quality loss but produce much larger files than JPEG for photographic content.

Side-by-Side Comparison

Compression: JPEG lossy | PNG lossless
Best for: JPEG photos | PNG graphics, screenshots, logos
Transparency: JPEG no | PNG yes
Typical file size (12MP photo): JPEG 3 MB | PNG 30 MB
Quality after re-saves: JPEG degrades | PNG identical
Color depth: JPEG 8-bit | PNG 8 or 16-bit
Browser support: Both universal

iPhone Screenshots Are PNG

Screenshots taken on iPhone are saved as PNG by default. This is intentional: screenshots usually contain text, sharp lines, and UI elements that would look blurry if saved as JPEG. PNG keeps every pixel crisp. The trade-off is that screenshot files are much larger than HEIC photos. If your iPhone is filling up with screenshots, deleting them is one of the fastest ways to recover space.

When to Use Which

Use JPEG for: Photos shared online, photo email attachments, anywhere file size matters
Use PNG for: Screenshots, logos, icons, charts, anything with text, anything needing transparency
Use HEIC for: iPhone photos when storage matters and recipients support HEIC

Related Terms

Frequently Asked Questions

Is JPEG or PNG better for iPhone photos?

JPEG is better for photos due to smaller file sizes. PNG is best for screenshots, logos, and graphics with transparency.

Why are PNG files larger than JPEG?

PNG uses lossless compression, preserving every pixel. JPEG uses lossy compression, producing files 5-10 times smaller.

Does PNG support transparency?

Yes. PNG supports an alpha channel for transparency. JPEG does not.

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