JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use?
Picking an image format is not about opinions — it is about matching compression style, transparency and browser support to the job. Here is the complete decision guide.
Four formats, one eternal question. The truth is that each format was designed for a different job, and almost every “which is better?” argument dissolves once you ask a better question: better for what? This guide gives you the mental model, the numbers, and a decision table you can pin next to your desk.
The one-sentence version
Photos go in JPG or WebP. Graphics with sharp edges or transparency go in PNG or WebP. Maximum savings on photos go to AVIF — if your audience’s browsers support it.
JPG — the universal workhorse
JPEG compression is lossy and built for photographs: it discards detail the human eye barely notices, achieving small files at quality levels that look perfect in context. It has no transparency support, and repeated re-saving compounds artifacts — keep your masters elsewhere.
- Use for: photographs, blog imagery, any situation where universal compatibility matters.
- Avoid for: logos, screenshots, anything needing transparency or razor-sharp text.
PNG — precision and transparency
PNG compression is lossless: every pixel survives intact, and a full alpha channel supports smooth transparency. The cost is size — photographic PNGs are routinely 5–10× heavier than quality JPEGs. For flat graphics the math flips and PNG is remarkably efficient.
- Use for: logos, icons, UI screenshots, images with text, transparent overlays.
- Avoid for: large photographs on the web.
WebP — the modern default
WebP offers both lossy and lossless modes plus alpha transparency, typically landing 25–35% smaller than comparable JPEG. Every current browser supports it, making WebP the sensible default for web imagery in 2026. The WebP converter processes whole batches in one pass.
AVIF — the frontier
AVIF compresses photos dramatically better than everything above — often 50% smaller than JPEG at similar quality — at the cost of slower encoding and patchier (though rapidly improving) support. Use it where the savings matter most: hero images and high-traffic pages. Try the AVIF converter to compare on your own photos.
The decision table
| Content | Best choice | Runner-up |
|---|---|---|
| Website hero photo | AVIF → WebP fallback | Compressed JPG (quality 80) |
| Blog post photos | WebP | JPG |
| Logo / icons | PNG or SVG | WebP (lossless) |
| Screenshots with text | PNG | WebP lossless |
| Transparent overlay | WebP / PNG | — |
| Email attachments | JPG | PNG (graphics) |
Converting between formats safely
Format conversion is lossless only in the direction of less information. JPG→PNG preserves what remains (the JPG to PNG converter handles batches); PNG→JPG permanently discards transparency and adds compression artifacts (the PNG to JPG converter lets you control the background fill). Keep originals before converting, and prefer one-way trips from master files.
Frequently asked questions
Does image format affect SEO?
Indirectly but meaningfully: modern formats load faster, and speed feeds Core Web Vitals. The image SEO guide covers the full chain from format to rankings.
Can WebP do everything PNG does?
For the web, practically yes — including transparency, in both lossy and lossless modes. For editing workflows, PNG remains the safer interchange choice.
Why is my PNG so much bigger than the JPG?
PNG stores every pixel losslessly; photography is exactly what lossy JPEG was invented to shrink. Convert photographic PNGs to JPG or WebP and watch them collapse by 80–90%.
Final thoughts
Stop thinking of formats as rivals — they are tools in one drawer. Default to WebP for the web, keep PNG for precision graphics, let AVIF earn its place on high-traffic pages, and keep JPG for universal compatibility. The format converter moves entire batches between all of them, free and without watermarks.