How to Choose a Favicon Format

The short answer

There is rarely one correct favicon format. A typical modern setup uses a scalable SVG favicon for browsers that support it, PNG files for fixed-size uses such as home-screen and app icons, and an ICO file as a fallback for older browsers and tools that still look for one. The right mix depends on where the icon has to appear, so start with that list of destinations rather than with a file type.

Two terms explain the choice. A vector file describes shapes as mathematical paths, so it can be redrawn sharply at any size. A raster file stores a fixed grid of pixels, so it looks best at the size it was made for and can blur or break up when scaled. A favicon is shown very small, which makes this difference matter more than it does for most logo uses.

What each favicon type is good for

Format | Type of content | Typical role | Main limitation

SVG | Vector paths (can also embed raster images) | Scalable browser tab icon; can adapt to light or dark themes when the code supports it | Browser support varies, so it is not a complete solution on its own

PNG | Raster pixels | Fixed-size icons for home screens, app manifests and platforms that request specific sizes | Each size is a separate file and must be exported deliberately

ICO | Container that can hold several raster images at different sizes | Fallback for older browsers and software that request it by default | Raster only; it needs its own small sizes prepared in advance

Treat this table as a description of roles, not a specification. Exact pixel sizes, file names and markup that each browser or operating system expects are set by those platforms and change over time. This guide does not supply confirmed size requirements; check the current documentation for every platform you target before exporting.

Why the logo file matters more than the extension

A file extension does not prove what is inside. An SVG may contain clean editable paths, or it may simply wrap an embedded bitmap, in which case it gains none of the sharpness of true vector artwork. Open the file in a vector editor and inspect it: you should see paths and shapes you can select, not a single placed image. An extension also says nothing about whether you have permission to adapt or reuse the logo, so confirm usage rights separately.

Choosing the symbol before choosing the format

A full logo with a wordmark usually becomes unreadable at favicon size. Most brands use a reduced mark instead: the symbol alone, a monogram or a single letter. This is a design recommendation rather than a technical rule, but it decides whether any format will work. A simple shape with strong contrast survives being reduced to a handful of pixels; fine lines, small text and subtle gradients generally do not.

• Isolate the simplest recognizable part of the logo.
• Remove or thicken thin strokes and close small gaps that would fill in at small sizes.
• Check that the shape reads on both light and dark browser backgrounds.
• Convert strokes and live text to outlined paths so the file does not depend on fonts or stroke settings.
• Keep a master vector file; export every favicon from it rather than from a previous export.

Step-by-step: from logo artwork to favicon files

• 1. List every place the icon must appear, such as browser tabs, bookmarks, mobile home screens and installable web apps.
• 2. For each destination, look up the format and sizes its current documentation asks for.
• 3. Prepare the simplified mark as clean vector paths on a square artboard, leaving consistent padding around it.
• 4. Export an optimized SVG from that artboard if you are using a vector favicon, and confirm it contains paths rather than an embedded image.
• 5. Export PNG files at each required size, reviewing the smallest ones by eye and adjusting the artwork if details merge or vanish.
• 6. Build the ICO fallback from the small PNG exports if you need to support older browsers or software.
• 7. Reference the files in the site markup and manifest as each platform's documentation describes.

How to verify the result

• Load the site in several browsers and confirm the expected icon appears in the tab, not a default placeholder.
• Check the tab icon against both light and dark browser themes.
• Add the site to a phone home screen and confirm the icon is sharp and not cropped unexpectedly.
• Clear the browser cache or use a private window when testing, because browsers often keep old favicons.
• Re-open the exported SVG in an editor to confirm it still contains editable paths.

Gaps to fill before you finalize

No confirmed specifications were available for this guide, so it does not state exact pixel dimensions, browser support levels or required file names. Those details should come from the current documentation of each browser and platform you plan to support. The format roles and artwork advice above are general principles and design recommendations, not platform requirements.