PNG vs JPG vs WebP: Which Should You Use?

Picking the wrong image format is one of the quietest ways to make a website slow or a graphic look bad. Save a screenshot as JPG and the text turns to mush. Save a photo as PNG and the file balloons to ten times the size it needed to be. This guide explains what each format is actually good at, when to use which, and why WebP is probably the answer more often than you think.

The one distinction that explains everything

Before comparing formats, understand the split they all fall on: lossy versus lossless.

Lossless formats keep every pixel exactly. Nothing is thrown away, so quality is perfect and files are large. Good for anything with sharp edges — text, lines, flat colour.

Lossy formats discard information the eye is bad at noticing, achieving huge savings. Excellent for photographs, where detail is soft and continuous. Bad for sharp edges, which is where the discarded data becomes visible as fuzzy halos and blocky artefacts.

Nearly every format mistake comes from applying a lossy format to sharp-edged content, or a lossless format to a photograph.

JPG (JPEG)

The old workhorse, and still the safest universal choice for photographs. It is lossy, with a quality slider that lets you trade size against fidelity.

• Best for: photographs, and anything with gradients and continuous tone.
• Strength: universal support — every device made in the last thirty years opens it. Excellent compression of photographic content.
• Weakness: no transparency, which is a hard dealbreaker for logos and icons. Sharp edges and text get visible artefacts. Every re-save degrades it further.

The re-save problem is worth emphasising: JPEG is generation-lossy. Open a JPEG, make a small edit, save it, and the whole image is re-encoded and slightly degraded. Do that ten times and the damage is obvious. Always edit from an original.

PNG

The lossless option, and the format people reach for when they need transparency.

• Best for: logos, icons, diagrams, screenshots, and anything needing a transparent background.
• Strength: perfect quality with no artefacts, and full alpha transparency — including soft, partially transparent edges, so a logo can sit cleanly on any background colour.
• Weakness: terrible for photographs. A PNG of a photo can easily be five to ten times the size of an equivalent JPEG, for a difference nobody can see.

A useful mental model: PNG compresses by finding repetition. A logo with big areas of identical colour is highly repetitive, so it compresses brilliantly. A photograph, where nearly every pixel differs slightly from its neighbour, has almost nothing to exploit — so the file stays huge.

WebP

The modern format, and for most web work the best default. Its trick is that it does both: it offers a lossy mode and a lossless mode, and it supports transparency in both.

• Best for: almost everything on the web.
• Strength: typically 25–35% smaller than JPEG at equivalent visual quality, and often meaningfully smaller than PNG for graphics. Supports transparency and animation. Supported by every current browser.
• Weakness: less convenient outside the browser — some older desktop software and printers still do not handle it, and email clients can be inconsistent.

This is the headline: WebP gives you JPEG-like compression with PNG-like transparency. It removes the old either/or compromise. If your image is destined for a web page, WebP is usually the right answer, and converting existing JPEGs and PNGs to WebP is often a free 30% speed win.

Head to head

• Transparency: PNG ✅ · WebP ✅ · JPG ❌
• Photos (small files): WebP ✅ · JPG ✅ · PNG ❌
• Sharp text / screenshots: PNG ✅ · WebP ✅ · JPG ❌
• Universal compatibility: JPG ✅ · PNG ✅ · WebP ⚠️ (fine in browsers, patchier elsewhere)
• Animation: WebP ✅ · others ❌

Two formats worth knowing about

SVG is not a competitor so much as a different category. It is a vector format: instead of storing pixels, it stores instructions for drawing shapes. That means it scales to any size with zero quality loss and stays tiny. For logos, icons and simple illustrations, SVG beats all three raster formats outright — but it cannot represent a photograph.

AVIF is the newer challenger, compressing even better than WebP — often another 20% smaller. Browser support is now good, though tooling is less mature. It is worth watching, and worth using for large hero images where the saving is biggest.

A simple decision guide

1. Is it a logo, icon or simple illustration? → Use SVG if you can.
2. Does it need transparency? → WebP, falling back to PNG where compatibility matters.
3. Is it a screenshot, or does it contain small text? → PNG or lossless WebP. Never JPG.
4. Is it a photograph for the web? → WebP, falling back to JPG.
5. Is it a photograph for email, print or an unknown recipient? → JPG, for maximum compatibility.

Common mistakes to avoid

• Screenshots as JPG. The single most common format error. Small text turns fuzzy and the file is often bigger than a PNG would have been anyway.
• Photos as PNG. Enormous files for no visible benefit.
• Re-saving JPEGs repeatedly. Each save degrades the image further.
• Assuming PNG means “high quality.” PNG is lossless, but a well-compressed JPEG of a photo looks identical at a fraction of the size.
• Avoiding WebP over compatibility fears. Browser support has been universal for years.

Frequently asked questions

Is WebP better than PNG? For the web, usually yes — it supports transparency and produces smaller files. Keep PNG where you need guaranteed compatibility outside a browser.

Does converting JPG to PNG improve quality? No. The detail JPEG discarded is gone forever; converting to PNG just preserves the damage in a much bigger file.

Which format is best for printing? A high-quality JPEG or a lossless format like PNG or TIFF. Avoid heavily compressed images.

Do image formats affect SEO? Indirectly but genuinely — smaller images mean faster pages, and page speed is a ranking signal through Core Web Vitals.

Convert your images now

Use our Image Converter to switch between JPG, PNG and WebP in your browser — no upload, nothing leaves your device. Then shrink the result with the Image Compressor, or read our full guide on compressing images for the web.