PNG vs JPEG — Image Format Comparison
PNG and JPEG are the two most widely used raster image formats on the web, but they use fundamentally different compression approaches suited to different types of images. PNG uses lossless compression, preserving every pixel exactly, while JPEG uses lossy compression, discarding visual information to achieve much smaller files. Choosing the wrong format for your image type results in either poor quality (JPEG for screenshots) or unnecessarily large files (PNG for photographs).
Comparison Table
| Aspect | PNG | JPEG |
|---|---|---|
| Compression type | Lossless — pixel-perfect reproduction | Lossy — visual data discarded for smaller size |
| Transparency | Full alpha channel transparency (8-bit per pixel) | Not supported; no transparency |
| Best for | Screenshots, icons, logos, text, diagrams | Photographs, complex color gradients, camera images |
| File size | Larger for photos; efficient for simple graphics | Much smaller for photos (up to 10x vs PNG) |
| Quality settings | No quality setting; always lossless | Quality 0–100; trade file size for visual quality |
| Color depth | 8-bit per channel (24-bit RGB or 32-bit RGBA) | 8-bit per channel (24-bit RGB); no alpha |
| Artifacts | None — lossless | Blocking and ringing artifacts at high compression |
When to Use PNG
Use PNG for screenshots, UI graphics, icons, logos, and any image with sharp edges or text. PNG's lossless compression preserves the crisp edges between colors perfectly — JPEG compression creates visible "ringing" artifacts around hard edges and text. PNG is also essential when you need transparency: icons and logos with transparent backgrounds can only be PNG (or WebP/SVG). Screenshots look dramatically sharper as PNG versus JPEG.
When to Use JPEG
Use JPEG for photographs and photorealistic images where the visual data is complex and some quality loss is imperceptible. A JPEG photo at quality 80 is typically 10x smaller than the equivalent PNG with no visible quality difference to a human eye. Every photograph on the web that does not need transparency or pixel-perfect accuracy should be JPEG (or WebP/AVIF for even better compression).
Convert Between PNG and JPEG
Convert PNG images to JPEG with a quality slider and see the before/after file size.
Convert JPEG images to lossless PNG format entirely in your browser.
Compress images by adjusting JPEG quality to reduce file size without leaving your browser.
Detect the true format of any image file by reading its magic bytes — catches misnamed files instantly.
FAQ
- Can JPEG do transparency?
- No. JPEG has no support for transparent pixels. If you need a photo with a transparent background (for compositing or overlay), you must use PNG, WebP, or GIF. A JPEG will always have a solid background, commonly white.
- What is the best JPEG quality setting?
- Quality 80–85 is the standard sweet spot for web images — it produces files that are 3–5x smaller than quality 100 with virtually no perceptible quality loss for photographic images. Quality below 60 introduces visible artifacts. For images that will be recompressed later, use higher quality (90+) to prevent generational quality loss.
- Should I use WebP instead of PNG and JPEG?
- For new web projects, WebP is the better choice for both use cases: WebP lossless replaces PNG (typically 26% smaller), and WebP lossy replaces JPEG (25–34% smaller). All major browsers now support WebP. Use PNG/JPEG as fallbacks via the <picture> element for older browsers.