PNG vs JPG: Which Image Format Should You Use?

The short answer

• Photos → JPG (or WEBP).
• Logos, icons, screenshots with text → PNG (or WEBP).
• Anything for the modern web → WEBP, with PNG/JPG as fallback.

The long answer is about why — and the answer comes down to how each format encodes pixels.

How JPG works

JPG (or JPEG) uses lossy compression built on the discrete cosine transform. It chops an image into 8×8 blocks, converts each block to the frequency domain, then throws away the highest frequencies — the detail your eye is least likely to notice.

Strengths:

• Tiny file sizes for photographic content (often 5–10× smaller than PNG).
• Universally supported.
• 24-bit color (16 million colors).

Weaknesses:

• No transparency. Every JPG has a solid background.
• Generational loss. Re-saving a JPG degrades it.
• Artifacting around sharp edges and text. Logos look fuzzy.
• No lossless mode (in practical use; LS-JPEG exists but isn't supported).

How PNG works

PNG uses lossless deflate compression with per-row predictive filters. Every pixel comes out identical to what went in.

Strengths:

• Lossless — re-save as many times as you like.
• Alpha transparency — full per-pixel opacity, perfect for logos on any background.
• 1/2/4/8-bit palette mode — tiny files for icons with few colors.
• Sharp text and edges — no artifacts.

Weaknesses:

• Huge for photos. A 12 MP photo as PNG can easily be 20+ MB.
• Slower to decode than JPG at equivalent dimensions (usually negligible).

The decision matrix

| Use case | Best format | Why | |---|---|---| | Phone photo for web | JPG or WEBP | Tiny, photographic | | Product photo with transparent bg | WEBP or PNG | Need alpha | | Logo / icon | PNG (or SVG) | Sharp edges, transparency | | Screenshot with text | PNG | Text stays crisp | | Email signature logo | PNG | Universal support, transparency | | Hero banner (web) | WEBP | Best ratio, supported | | Print collateral | PNG or TIFF | Lossless, high detail |

What about WEBP?

WEBP, released by Google in 2010, supports both lossy (better than JPG) and lossless (better than PNG) modes, plus alpha transparency and animation. As of 2025 it's supported by every major browser.

The honest caveats:

• Some older CMS workflows still expect JPG/PNG.
• A few image-processing pipelines choke on WEBP inputs.
• AVIF is even smaller but encodes slower.

For new web projects, default to WEBP. Use PNG/JPG when you need maximum compatibility or specific tooling support.

Converting between formats

Browser-based converters make this trivial:

• PNG → JPG: use the PNG to JPG tool. Pick a background color (since JPG can't be transparent) and download.
• JPG → PNG: use the JPG to PNG tool for lossless re-encoding.
• Anything → WEBP: use the WEBP Converter with a quality slider.

Common mistakes

• Shipping a PNG photo. A 5 MB hero image is almost always a PNG that should have been a 200 KB JPG or 150 KB WEBP.
• Shipping a JPG logo. Fuzzy edges and an ugly white box around your brand mark.
• Re-compressing JPGs repeatedly. Each save loses detail. Keep a master PNG/lossless source and export JPGs from it.
• Using PNG for animated content. Use WEBP, MP4 or SVG instead of bloated PNG sequences.

Conclusion

Pick the format that matches your content: PNG for sharp graphics and transparency, JPG for photos and gradients, WEBP as the modern default when you can. Convert as needed with the PNG to JPG and WEBP Converter tools — all in your browser, all free.