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

Choosing the wrong image format is one of the most common causes of slow websites, bloated design files, and quality loss. JPEG, PNG, and WebP each solve a different problem — and knowing which to reach for (and when to convert) will save you file size, load time, and headaches.

The quick answer

JPEG: the universal photo format

JPEG (Joint Photographic Experts Group) has been around since 1992 and is still the most widely used image format in the world. It uses lossy compression — meaning some image data is permanently discarded to make the file smaller. The compression is tunable: a quality setting of 90 is nearly indistinguishable from the original; a setting of 40 produces a much smaller file with visible degradation.

JPEG is designed for photographs and complex images with gradual color transitions. The lossy compression algorithm works by discarding fine detail the human eye is less sensitive to. This works beautifully for a landscape photo; it works poorly for text, line art, or images with flat blocks of color, where it introduces visible artifacts around edges.

JPEG does not support transparency. If you need a logo on a non-white background, you need PNG or WebP.

PNG: lossless with transparency

PNG (Portable Network Graphics) uses lossless compression — every pixel in the original is preserved exactly. This makes PNG ideal for images where quality cannot be compromised: logos, UI elements, screenshots with text, icons, and diagrams.

PNG supports full transparency (alpha channel), making it the standard for assets that need to sit on different backgrounds. A logo exported as PNG will look correct whether placed on a white page, a dark website header, or a coloured card.

The trade-off is file size. A photograph saved as PNG will be significantly larger than the same photo saved as JPEG at high quality — often 3–5× larger. PNG is not suited for photographs on the web.

WebP: the modern web format

WebP was developed by Google and released in 2010, designed specifically for web use. It supports both lossy and lossless compression, and it supports transparency — making it a single format that can replace both JPEG and PNG in most web contexts.

The headline number: WebP lossy files are typically 25–35% smaller than JPEG at equivalent visual quality. WebP lossless files are typically 26% smaller than equivalent PNGs. This is a significant saving when you're serving thousands of images on a website.

Browser support for WebP is now excellent — all major browsers (Chrome, Firefox, Safari, Edge) have supported it since 2020. For most web projects, WebP is the right default choice for images.

When to use each format

Use JPEG when:

• You're working with photographs and transparency isn't needed
• You need universal compatibility (old software, hardware devices, email clients)
• File size matters and you're okay with minor quality loss

Use PNG when:

• You need transparency (logos, UI assets, icons)
• The image contains text, line art, or sharp edges where artifacts would be visible
• Quality cannot be compromised (source files, design assets)
• You're sending files to someone who may not support WebP

Use WebP when:

• You're optimizing images for a website and browser support is guaranteed
• You want the smallest file size without sacrificing quality
• You need transparency but also want better compression than PNG
• You're using a modern CMS or image pipeline that supports WebP

What about AVIF?

AVIF is a newer format (based on the AV1 video codec) that offers even better compression than WebP — often 20–50% smaller at the same quality. Browser support has grown rapidly and is now strong across major browsers. For maximum efficiency on the web, AVIF is the cutting-edge choice, though WebP remains the safe default for broad compatibility.

How to convert between formats for free

Safe File Converter handles JPEG, PNG, and WebP conversion locally in your browser. Drop your image, choose the output format, and download — no server, no upload, no account.