PNG, JPG or SVG: Choosing a Format for a Sharp Favicon

The short answer

For a crisp favicon, use SVG as the primary source when your logo is genuinely vector-based, and keep PNG versions for places that expect a fixed-size bitmap. JPG is rarely the right choice. Its lossy compression softens the hard edges and flat colors that small logo marks depend on, and it cannot store transparency.

This guide covers the favicon itself: the small mark shown in browser tabs, bookmarks and shortcuts. It does not assess any particular brand's logo. No specific logo files, browser test results or measurements were supplied for this article, so the comparison relies on general, verifiable properties of each format.

How the three formats differ

Format | How it stores the image | Transparency | Behavior at small sizes | Typical favicon role

SVG | Vector shapes described as paths, fills and strokes | Yes | Rendered at whatever size is needed, so edges are recalculated rather than stretched | Primary scalable icon where supported

PNG | Pixel grid with lossless compression | Yes, including partial transparency | Sharp at the exact size it was exported for; blurs or blocks when resized | Fixed-size fallbacks and home-screen or app icons

JPG | Pixel grid with lossy compression | No | Compression can add halos and color noise around edges | Generally unsuitable for logo marks

Why sharpness depends on more than the format

A favicon is often drawn at a tiny pixel size. At that scale, a format alone cannot save a logo with thin strokes, fine lettering or many small details. A full wordmark tends to collapse into a smudge, which is why many brands use a simplified symbol or a single letter for the favicon instead.

• Simplify the mark: keep the most recognizable shape and drop taglines or small text.
• Thicken thin strokes so they do not vanish or turn gray from anti-aliasing.
• Use strong contrast between the mark and its background, and check it on both light and dark browser themes.
• Preview the icon at its real display size rather than judging it zoomed in on a design canvas.

Choosing by situation

• You have clean vector artwork and want one file that scales: export a simplified SVG as the main favicon.
• You need icons for specific fixed sizes, such as mobile home-screen shortcuts: export PNG at each required size from the vector source.
• You want an icon that adapts to dark mode: SVG can include a style rule that responds to the user's color-scheme preference, which PNG and JPG cannot do.
• You only have a JPG of the logo: treat it as a reference, not a final asset, and rebuild or request a vector or transparent PNG version.

Caveats when working with logo files

An SVG extension does not prove the artwork is truly vector. An SVG file can simply wrap an embedded bitmap, in which case it will blur when scaled just like a PNG. Open the file in a vector editor or inspect its contents to confirm it is built from paths before relying on it.

Browser support for SVG favicons has historically been uneven, and the evidence for this article does not include current compatibility data. Check up-to-date browser documentation before dropping PNG or ICO fallbacks entirely.

Finally, being able to download a logo file does not mean you may reuse it. Confirm usage rights with the brand owner before turning someone else's logo into a favicon.