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Every image format makes trade-offs. JPG is small but lossy. PNG is sharp but huge. WebP is the modern middle ground. AVIF is the future. Here's when to use each.
Format comparison
| Format | Compression | Transparency | Animation | Browser support |
|---|---|---|---|---|
| JPEG | Lossy | No | No | 100% |
| PNG | Lossless | Yes | No | 100% |
| WebP | Both | Yes | Yes | 97% |
| AVIF | Both | Yes | Yes | 90% |
| GIF | Lossless | 1-bit | Yes | 100% |
When to use JPEG
- Photographs. JPEG's lossy compression is optimized for natural images.
- Email attachments. Smallest file size for photos.
- Social media. Most platforms convert uploads to JPEG anyway.
- When transparency isn't needed. JPEG doesn't support alpha channels.
When to use PNG
- Screenshots. Text and sharp edges stay crisp with lossless compression.
- Logos and icons. Transparency support + lossless = clean edges.
- When you need transparency. PNG supports full alpha channels.
- Print production. Lossless quality for professional printing.
When to use WebP
- Web pages. 25-35% smaller than JPEG at equivalent quality.
- When you need transparency + small size. WebP's lossy+alpha is unique.
- Animated images. WebP animation is smaller than GIF.
- Modern web apps. 97% browser support in 2026.
When to use AVIF
- Hero images. Maximum compression for large, prominent images.
- Photography portfolios. Best quality-to-size ratio.
- When file size matters most. AVIF is 50% smaller than JPEG.
- Progressive enhancement. Use with JPEG fallback for older browsers.
Decision tree
Need transparency?
├── Yes → PNG (lossless) or WebP (lossy, smaller)
└── No → Is it a photograph?
├── Yes → AVIF > WebP > JPEG (by quality/size)
└── No → PNG (screenshot, logo, icon)
Conversion tips
- JPEG → WebP: Usually saves 25-35% with no visible quality loss.
- PNG → WebP: Saves 25-30% for photos, less for screenshots.
- GIF → WebP: Animation file size drops by 50-70%.
- Never convert JPEG → PNG. You don't regain lost quality — the file just gets bigger.
Format cheat sheet: strengths and weaknesses
The table above covers raw capabilities. This one is about judgment — what each format is actually best and worst at:
| Format | Best for | Avoid for | Transparency | Typical size vs JPEG |
|---|---|---|---|---|
| JPEG | Photos, email, universal compatibility | Text, logos, flat color, transparency | No | Baseline (1.0x) |
| PNG | Screenshots, logos, sharp edges | Photographs (huge files) | Full alpha | 3-10x larger |
| WebP | Everyday web images, animation | Print, legacy software | Full alpha | 0.65-0.75x |
| AVIF | Hero images, best compression | Fast-encode needs, ancient browsers | Full alpha | 0.5x |
| GIF | Tiny legacy animations | Anything with many colors | 1-bit only | Much larger |
Real-world size comparison
The same 1200×800 photograph, exported at visually equivalent quality, lands roughly at:
| Format | Approx. size | Relative |
|---|---|---|
| PNG-24 | ~1,800 KB | 6.0x |
| JPEG q85 | ~300 KB | 1.0x |
| WebP q80 | ~210 KB | 0.7x |
| AVIF q55 | ~150 KB | 0.5x |
Numbers vary with image content — a busy photo compresses less than a simple one — but the ranking is consistent: AVIF < WebP < JPEG < PNG for photographic content. Run your own files through Image Compressor to see the exact savings, and use Photo Resizer to scale down to the display size before converting — smaller dimensions shrink every format further.
A step-by-step decision flow
- Do you need transparency? If yes and it is a flat graphic, use PNG; if it is a photo-style cutout, use WebP with alpha. See how to make a transparent PNG.
- Is it a photograph? Use AVIF first, WebP as the widely supported fallback, JPEG only for maximum compatibility.
- Is it a screenshot, logo, or line art? PNG keeps edges crisp; WebP lossless is a smaller alternative.
- Does it animate? Use WebP (or AVIF) animation, not GIF.
- Whatever you pick, compress it. Format choice and compression are separate steps — see compressing images without losing quality.
Frequently Asked Questions
Is AVIF always better than WebP?
For compression, usually yes — AVIF is often 20-30% smaller at the same quality. But AVIF encodes more slowly and has slightly lower browser support (about 90% vs 97%), so WebP remains a safe default with an AVIF upgrade for hero images.
Should I convert all my PNGs to WebP?
Convert photographic PNGs — the savings are large. Flat logos and simple icons are already tiny as PNG-8 and gain little, so converting them is optional.
Does converting JPEG to PNG improve quality?
No. Quality already lost to JPEG compression cannot be recovered, and the PNG will be far larger. Only go JPEG-to-PNG if you specifically need lossless editing from that point on.
Which format should I use if I can only pick one?
WebP. It handles photos, graphics, transparency, and animation with wide browser support, making it the best single-format compromise for the web in 2026.
Related tools
- Image Compressor — compress across formats
- Photo Resizer — resize and convert between formats
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