JPG vs PNG vs WebP vs AVIF — Best Image Formats Compared

Quick comparison table

JPG / JPEG — the universal standard

JPG has been the default photo format for decades. It uses lossy compression, meaning it discards some data to achieve smaller files. At quality 80–90%, the loss is invisible to most viewers.

Use JPG when: Uploading photos to websites, social media, exam portals, or email attachments. It's universally accepted.

Avoid JPG when: You need transparency, sharp text/logos, or need to edit the same file repeatedly (each save degrades quality).

PNG — lossless quality with transparency

PNG preserves every pixel perfectly and supports transparent backgrounds. The trade-off is larger file sizes — a PNG photo can be 3–5× larger than an equivalent JPG.

Use PNG when: You need transparency (logos, icons), sharp text in screenshots, or need to preserve exact pixel data.

Avoid PNG when: Working with photographs where file size matters. A 4MB PNG photo could be a 200KB JPG with no visible quality difference.

WebP — the modern sweet spot

Developed by Google, WebP offers 25–35% smaller files than JPG at equivalent visual quality. It supports both lossy and lossless modes, plus transparency and animation. Browser support is now above 95%.

Use WebP when: Building websites where page speed matters. It's the best balance of quality, features, and compatibility for web use.

Avoid WebP when: Submitting to government portals or older systems that only accept JPG/PNG.

AVIF — the future of web images

AVIF is the newest format and offers the best compression — typically 30–50% smaller than JPG and 20% smaller than WebP at similar quality. According to Mozilla's Web Media Guidelines, it supports HDR, transparency, and wide colour gamuts.

Use AVIF when: Maximum compression is critical and you can provide fallbacks for older browsers.

Avoid AVIF when: Encoding speed matters (AVIF is slow to encode), or when maximum browser compatibility is required.

How to choose the right format

1. For exam/passport uploads: JPG — it's what portals expect.
2. For website images: WebP with JPG fallback for best performance.
3. For logos/icons: PNG or SVG for crisp edges and transparency.
4. For background removal results: PNG to preserve the transparent background.
5. For maximum compression: AVIF if your platform supports it.