JPG vs PNG vs WebP vs AVIF
JPG and PNG are the old guard; WebP and AVIF are the modern challengers. This comparison shows how the four formats stack up on compression, quality, and browser support so you can choose with confidence.
The Four Formats at a Glance
| Format | Type | Transparency | Support |
|---|---|---|---|
| JPG | Lossy | No | Universal (since the 1990s) |
| PNG | Lossless | Yes | Universal |
| WebP | Both lossy & lossless | Yes | All modern browsers |
| AVIF | Both lossy & lossless | Yes | Most modern browsers |
Where JPG and PNG Came From
JPG and PNG are the legacy workhorses. JPG arrived in 1992 for photographs; PNG arrived in 1996 as a free, lossless alternative to GIF. Both are supported literally everywhere — every email client, every browser, every social platform. That universality is their superpower, and why they remain the safe default today.
Enter WebP
WebP, developed by Google, supports both lossy and lossless compression plus transparency and animation — effectively a superset of JPG and PNG in one format. At the same perceived quality it is typically 25–35% smaller than JPG and far smaller than PNG. The catch used to be browser support, but today all modern browsers (Chrome, Firefox, Safari, Edge) handle WebP, leaving only very old clients behind.
Enter AVIF
AVIF is the newest of the four, built on the AV1 video codec. It pushes compression even further — often 50% smaller than JPG at equal quality — and adds features like HDR and wide color gamut. Its weakness is compatibility: support is strong in current browsers but absent in anything older, and encoding can be slower. AVIF is the format to adopt for cutting-edge performance with a fallback.
Compression Efficiency, Head to Head
At equal perceived quality, the size ordering from largest to smallest is roughly PNG (photos) > JPG > WebP > AVIF. A photograph that is 200KB as JPG might be ~140KB as WebP and ~100KB as AVIF, while the same photo as PNG could be 1.5MB. For graphics with flat colors, PNG and WebP are close, and AVIF may even regress — so format choice still depends on content.
When to Use Each
- Need maximum compatibility → JPG (photos) or PNG (graphics).
- Modern site, smaller files, broad support → WebP.
- Cutting-edge, smallest files → AVIF with a WebP fallback.
- Transparency needed → PNG, WebP, or AVIF (never JPG).
- Animation → WebP or AVIF (GIF is huge by comparison).
The Practical Rollout
Most sites should serve AVIF first, fall back to WebP, then to JPG/PNG for ancient clients. Content delivery networks and modern build tools can automate this with the <picture> element, so you get the smallest file each visitor’s browser supports without maintaining three copies by hand.
Future-proofing
Author in JPG/PNG for safety, then let your pipeline generate WebP and AVIF. You keep universal compatibility and gain modern compression for free.
Related Tools
Frequently Asked Questions
Is JPG or PNG better for websites?
Use JPG for photos and complex images where file size matters, and PNG for graphics, logos, and anything that needs transparency. JPG keeps pages light; PNG keeps edges crisp.
Does PNG lose quality when saved?
No. PNG uses lossless compression, so it preserves every pixel exactly. JPG is lossy and discards some data each time you save at a lower quality setting.
Which is smaller, JPG or PNG?
For photographs, JPG is almost always much smaller. For simple graphics with flat colors, PNG can be smaller because it compresses solid areas very efficiently.
Can JPG have a transparent background?
No. JPG does not support transparency. If you need a transparent background, convert to PNG or WebP instead.