WebP vs PNG vs AVIF: Which Image Format Should You Use?

Image format choice looks trivial from a distance — pick the smallest file and call it done. In practice it's a tradeoff across four dimensions: loss behavior (lossless vs lossy), feature support (alpha transparency, animation, HDR), tool compatibility (everywhere or "modern browsers only"), and licensing. The right pick depends on what the image is for. This guide walks through the formats that actually matter in 2026 and gives a concrete recommendation for each common use case.

JPEG (1992): The Default for Photographs

JPEG is lossy, doesn't support transparency, and has been the web's default photo format for thirty years. Its compression is excellent for natural scenes — photos with smooth gradients and complex color variation compress to surprisingly small files at acceptable perceptual quality. The downside is sharp edges: JPEG blocky artifacts around text, line art, and hard-edged UI screenshots are the reason designers don't ship JPEGs of any image that contains text.

Use JPEG when:

The image is a photograph and quality loss is acceptable
The destination is universal — every device, app, and OS from the past three decades decodes it
File size matters more than pixel-perfect accuracy

Don't use JPEG for screenshots, logos, line art, or anything where the edges matter — the artifacts will be visible.

PNG (1996): The Default for Graphics

PNG is lossless, supports full alpha transparency, and is the universal interchange format for UI graphics. File sizes are larger than JPEG for photos but lossless, so a screenshot of a UI ends up smaller and sharper as a PNG than as a JPEG. PNG handles text and sharp edges flawlessly because there's no lossy compression step.

The trade-off is file size: a high-resolution photograph as PNG can be 5–10× the size of the same photo as a quality-85 JPEG. For the web, that overhead is wasted bandwidth for content the user perceives identically.

Use PNG when:

The image has text, sharp edges, transparency, or limited color palette (logos, icons, screenshots)
Round-trip editing matters — every save is lossless
Universal compatibility matters (you'll be able to open the file in twenty years)

Don't use PNG for hero photographs unless you specifically need lossless quality.

WebP (2010): The Web-Native Default

WebP is Google's answer to "JPEG and PNG got us this far, but not all the way." It supports both lossy and lossless compression, full alpha transparency, animation, and ICC color profiles — basically everything JPEG and PNG do, in one format with better compression at equivalent perceptual quality.

In practice, WebP lands 25-35% smaller than JPEG at the same SSIM score, and significantly smaller than PNG for graphics that don't need true lossless (which is most web-graphics). When converting WebP to PNG, expect the output to be roughly 3-5x larger than the source: a 120 KB WebP photo typically becomes a 400-600 KB PNG. For a batch of 10 product photos (each ~200 KB WebP), the total PNG output is roughly 6-10 MB — worth knowing before you fill up a chat attachment limit. The conversion itself is instant in the browser (canvas.decode + canvas.toBlob), with no perceptible delay even on a phone.

Use WebP for web images when you control the delivery channel and can verify the destination decodes it. If you're shipping to a third-party pipeline (a print-on-demand vendor, a CMS that hasn't been updated, an old mobile app), confirm before defaulting to WebP.

Our PNG to WebP converter and JPG to WebP converter make the migration one-click.

AVIF (2019): The Newest, Best Compression, Narrowest Support

AVIF is a royalty-free codec based on the same AV1 video codec. At equivalent perceptual quality it lands 20% smaller than WebP and 50% smaller than JPEG. It also supports HDR, wide color gamut (Rec. 2020), film grain synthesis, and 12-bit color depth — things JPEG, PNG, and WebP can't represent at all.

The catch is support: every modern browser ships AVIF decoding (Chrome, Edge, Firefox, Safari), but native app support is patchier, and WordPress, Shopify, and most CMS platforms only added AVIF support in 2023–2024. If your users are exclusively on modern browsers, AVIF is the right answer. If any of them are on older mobile devices or specific enterprise software, you may need to fall back to WebP or JPEG for the long tail.

Use AVIF when:

You're at the performance frontier of a modern web property (marketing site, design portfolio, photography showcase)
You need HDR or wide color gamut
Your users are on modern browsers and you can serve a JPEG fallback for legacy clients

Our AVIF to PNG converter and AVIF to JPG converter handle the legacy path back to a raster format.

JPEG XL (2020): The Technically Best Option

JPEG XL is the only format here that supports both lossless re-encoding of legacy JPEGs (without any quality loss) and better-than-AVIF compression for new images. It's the right answer for photo archives and any workflow where re-encoding legacy JPEGs is unavoidable. Support is uneven — Apple declined to ship JPEG XL support in Safari, which limits its appeal for broadly-targeted web images — so for general web delivery in 2026, WebP and AVIF remain the practical defaults.

HEIC (Apple): Don't Edit It on the Web

HEIC is Apple's container for HEVC-encoded photos. It's smaller than JPEG at the same quality and supports depth maps, multi-image bursts, and live photos. The problem is that it doesn't decode in most browsers and many desktop image apps without first being converted. For images coming off an iPhone that you want to use anywhere, use the HEIC to JPG converter or HEIC to PNG converter first.

A Decision Tree

Screenshot, UI asset, logo, or graphic with text → PNG (universal, lossless, sharp).
Photograph going anywhere age-unknown → JPEG at q=85 (universal decode, smallest for photos).
Web image on a modern site you control → WebP (best balance of compression and support).
Maximum compression for cutting-edge web properties → AVIF (with a WebP or JPEG fallback for legacy clients).
Re-encoding a legacy JPEG archive → JPEG XL (if your tooling supports it) or WebP.
iPhone photo for anywhere outside Apple → convert HEIC to JPG or PNG first.

Convert Between Formats

All conversions stay local in your browser:

WebP to PNG
PNG to WebP
AVIF to PNG
PNG to JPG
HEIC to PNG
Image Compress — re-encode any of the above at a target quality level
Strip Image Metadata — drop EXIF, GPS, ICC profile before sharing