JPEG vs PNG: When to Use Each Format and Why

JPEG and PNG have coexisted for decades, and the choice between them is straightforward once you understand their fundamental difference: JPEG is lossy (sacrifices some quality for smaller files), while PNG is lossless (preserves every pixel perfectly but creates larger files).

Use JPEG For

Photographs

Photos have complex color gradients that JPEG handles efficiently. A 12MP photo might be 3-8MB as JPEG but 15-30MB as PNG. The quality difference at JPEG 85+ is invisible to most people.

Web images

Blog photos, hero images, product shots, and social media content should almost always be JPEG (or WebP/AVIF). File size directly affects page load speed.

Email attachments

JPEG is universally supported and produces reasonable file sizes for sharing.

Use PNG For

Screenshots

Screenshots contain sharp text and UI elements with hard edges. JPEG creates visible artifacts around text; PNG preserves them perfectly.

Logos and icons

Graphics with flat colors, text, and hard edges compress efficiently with PNG and maintain pixel-perfect quality.

Transparency

If you need a transparent background (logo overlay, cutout image), PNG supports alpha channels. JPEG doesn't.

Diagrams and charts

Data visualizations with lines, text, and flat colors should be PNG to maintain crispness.

The WebP Alternative

In many cases, WebP replaces both:

• WebP lossy replaces JPEG with 25-35% smaller files
• WebP lossless replaces PNG with 26% smaller files
• WebP supports transparency (unlike JPEG)

The Compress & Convert tool lets you convert between all formats and compare the results - helping you choose the right format for each image.

Common Mistakes

• Saving photos as PNG: Wastes 5-10x the storage with no visible benefit.
• Saving screenshots as JPEG: Creates ugly artifacts around text and edges.
• Re-saving JPEG multiple times: Each save at less than quality 100 adds more compression artifacts. Save as PNG during editing, convert to JPEG only for the final export.

Conclusion

The rule is simple: photos → JPEG (or WebP); graphics with hard edges or transparency → PNG. When in doubt, try both with the Compress tool and compare file sizes and visual quality. The tool processes everything in your browser, so you can experiment freely.