PNG vs JPG vs WebP vs AVIF: Which Image Format Should You Use in 2026?
A practical, numbers-first comparison of the four image formats that matter on the modern web — compression, transparency, browser support, and exactly when to use each.
Key takeaways
- JPG for maximum compatibility, PNG for lossless graphics with transparency, WebP as the modern default, AVIF when you need the smallest files.
- WebP is typically 25–34% smaller than JPG at equivalent quality; AVIF often halves JPG's size.
- All four formats are supported by every current browser — fallbacks are only needed for old software, email, and print.
- Never use lossy formats for editing masters; keep a PNG or TIFF original.
Four image formats dominate the modern web: PNG, JPG, WebP, and AVIF. Each makes a different trade-off between file size, quality, and features, and picking the right one is one of the cheapest performance wins available — images still account for roughly half of the average web page's weight.
This guide compares them on the criteria that actually matter, then gives a simple decision rule for each common situation.
How do the four formats compare on paper?
The table below summarizes the essential differences. The compression figures come from Google's published WebP studies and the Alliance for Open Media's AVIF benchmarks.
- JPG (1992): lossy only, no transparency, ~10:1 compression on photos, supported by literally everything.
- PNG (1996): lossless, full alpha transparency, large files for photos, supported by literally everything.
- WebP (2010): lossy or lossless, transparency and animation, ~25–34% smaller than JPG, all modern browsers.
- AVIF (2019): lossy or lossless, transparency, animation, HDR, ~50% smaller than JPG, all modern browsers (Safari 16.4+).
When should you use JPG?
Use JPG for photographs when maximum compatibility matters more than minimum file size: email attachments, uploads to legacy systems, print-shop submissions, and sharing with recipients on unknown software. JPG's universal support is still unmatched — every device, app, and operating system since the mid-1990s opens it.
At quality settings of 85–95, JPG compression artifacts are invisible in photographs. Avoid JPG for screenshots, text, and graphics with sharp edges, where its DCT artifacts become obvious, and never for images needing transparency.
When should you use PNG?
Use PNG for graphics where fidelity and transparency matter more than size: logos, icons, UI assets, screenshots, and anything with text. PNG is lossless, so it survives unlimited re-saves, and its alpha channel handles soft, anti-aliased edges perfectly.
PNG is also the right choice for editing masters. Save your working files as PNG (or TIFF), and export delivery copies to JPG, WebP, or AVIF. The one thing PNG should not be used for is photographs destined for the web — a photo as PNG is commonly 3–5× heavier than it needs to be.
When should you use WebP?
Use WebP as your default web delivery format. It does everything JPG and PNG do — lossy and lossless modes, transparency, even animation — at 25–34% smaller than JPG and ~26% smaller than PNG at equivalent quality (per Google's measurements). Browser support is effectively universal: Chrome, Edge, Firefox, and Safari (14.1+, released 2021) all render it natively.
WebP's only real weaknesses are legacy desktop software, some email clients, and print workflows — situations where JPG or PNG remain the safe choice.
When should you use AVIF?
Use AVIF when squeezing every last byte matters: high-traffic sites, image-heavy pages, and performance budgets. AVIF routinely produces files half the size of JPG at similar visual quality, and it adds HDR and wide-gamut support for modern displays.
The costs are encoding speed (AVIF is computationally expensive to create) and slightly narrower software support than WebP. The standard production pattern is a `<picture>` element serving AVIF first, WebP second, and JPG as the final fallback.
What is the simplest decision rule?
If you only remember one rule, make it this: keep editing masters as PNG, deliver photos on the web as WebP or AVIF with a JPG fallback, and use JPG or PNG only when the destination — email, print, legacy software — demands it.
When you need to move between formats, JoltFile's image converters handle PNG, JPG, WebP, AVIF, GIF, SVG, and HEIC in both directions, with browser-based processing that keeps your images on your own device.