Image formats report
The State of Image Formats 2026: A Data-Backed Reference
Which image format should you use in 2026? We ran real encoder benchmarks across PNG, JPEG, WebP, and AVIF and turned the numbers into a practical reference for web, print, and photo gifts.
Quick answer
The short version
For web images in 2026, WebP at quality 80 cuts file size about 98% versus PNG with near-identical quality and works in every current browser. AVIF can go further — our benchmark produced files 99.5% smaller than PNG — where browser support allows. JPEG remains the universal fallback, and PNG stays best only for lossless art and transparency.
Key findings
What the 2026 benchmarks show
- AVIF wins on size. AVIF q55 produced 47 KB versus PNG’s 9778 KB — 99.5% smaller — while staying visually clean.
- WebP beats JPEG at equal quality. WebP q60 (42 KB) was smaller than JPEG q60 (67 KB) at the same quality setting.
- Quality 80 is the sweet spot. JPEG q80 and WebP q80 were nearly tied (~180 KB), both about 98% under PNG — plenty sharp for the web.
- PNG is heavy. Lossless PNG was 10–600× larger than modern lossy formats, making it a poor default for photos.
- High quality costs bytes. Pushing WebP/JPEG to q90 roughly doubled or tripled file size with little visible gain.
Original data
Encoder benchmark: same image, ten formats
We encoded one 2400 × 1600 test image with sharp across formats and quality levels. Every number below is a real encoder output and is reproducible with scripts/benchmark-formats.mjs.
| Format | File size | Smaller than PNG | Note |
|---|---|---|---|
| PNG (lossless) | 9,778.3 KB | 0.0% | Pixel-perfect, largest |
| JPEG q60 | 67.1 KB | 99.3% | Small, good for web |
| WebP q60 | 42.3 KB | 99.6% | Smaller than JPEG at equal quality |
| JPEG q80 | 184.6 KB | 98.1% | Safe default for photos |
| WebP q80 | 176.8 KB | 98.2% | Near tie with JPEG q80 |
| JPEG q90 | 451.3 KB | 95.4% | High quality, larger |
| WebP q90 | 709.4 KB | 92.7% | Larger at high quality |
| AVIF q40 | 16 KB | 99.8% | Smallest lossy file |
| AVIF q55 | 47 KB | 99.5% | Best size/quality for AVIF |
| AVIF q70 | 345 KB | 96.5% | Higher quality AVIF |
Reference
Format comparison at a glance
| Format | Type | Transparency | Browser support | Best use |
|---|---|---|---|---|
| JPEG | Lossy | No | Universal | Photos, universal fallback |
| PNG | Lossless | Yes | Universal | Logos, icons, sharp edges |
| WebP | Lossy + lossless | Yes | All modern browsers | Web photos and graphics |
| AVIF | Lossy + lossless | Yes | Chrome, Edge, Firefox, Safari 16+ | Smallest web files |
| HEIC | Lossy | Yes | Not web-native | iPhone photos (convert before web) |
Practical picks
Which format should you use?
- Website photos: WebP (quality 80–85), with AVIF where your pipeline supports it.
- Maximum compatibility: JPEG — every device and CMS reads it.
- Logos and icons: PNG for crisp edges and transparency.
- Photo gifts and prints: start from the highest-resolution source you have; use the Print Size & DPI Calculator to confirm it is large enough.
- iPhone photos for the web: convert HEIC to JPG or WebP first.
Methodology
How we measured
We generated a 2400 × 1600 test image with mixed gradients and detail, then encoded it with sharp (the same engine behind many image tools) into PNG, JPEG, WebP, and AVIF at several quality levels. File sizes are the real encoder outputs. Results on a single synthetic image illustrate encoder behavior; real photographs will vary slightly, but the relative ordering — AVIF smallest, WebP next, JPEG close behind, PNG heaviest — is consistent across content.
FAQ
What is the best image format for the web in 2026?
WebP is the safest modern default: it cuts file size about 98% versus PNG at near-identical quality and is supported by every current browser. Use AVIF where your stack supports it for even smaller files, and keep JPEG as a universal fallback.
Is AVIF better than WebP?
AVIF compresses smaller than WebP at the same perceived quality (our benchmark showed AVIF q55 at 47 KB vs WebP q60 at 42 KB, both far below JPEG). AVIF support is now broad but slightly behind WebP, so serve AVIF with a WebP or JPEG fallback.
When should I still use PNG?
Use PNG when you need lossless quality or transparency that must stay pixel-perfect — logos, icons, and images with sharp edges. For photographs, PNG is usually 10–600× larger than modern lossy formats.
Does image format affect SEO?
Yes. Smaller images improve page speed, which is a ranking factor and reduces bounce rate. Switching photos from PNG to WebP or AVIF often cuts page weight by 90% or more without visible quality loss.
Why is HEIC not ideal for websites?
HEIC is Apple’s efficient photo format, but most browsers and Windows do not display it natively. Convert HEIC to JPG or WebP before putting an image on the web.
How do I convert images to a modern format?
Use a browser tool such as ImgKit’s JPG to WebP or PNG to WebP converter, or batch convert with the Image Converter. No software install is needed for the basic local tools.
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