问题
I have a favicon with the dimensions of height=26px / width=20px named favicon.png
<link href=http://www.example.com/images/favicon.png rel="shortcut icon" />
However, in my browser, my favicon.png is all distorted.
Question: Is my favicon.png supposed to be a particular size? Also, can I use a non-standard size/dimension and if so, how?
回答1:
Short answer
The favicon is supposed to be a set of 16x16, 32x32 and 48x48 pictures in ICO format. ICO format is different than PNG. Non-square pictures are not supported.
To generate the favicon, for many reasons explained below, I advise you to use this favicon generator. Full disclosure: I'm the author of this site.
Long, comprehensive answer
Favicon must be square. Desktop browsers and Apple iOS do not support non-square icons.
The favicon is supported by several files:
- A
favicon.icoicon. - Some other PNG icons.
In order to get the best results across desktop browsers (Windows/IE, MacOS/Safari, etc.), you need to combine both types of icons.
favicon.ico
Although all desktop browsers can deal with this icon, it is primarily for older version of IE.
The ICO format is different of the PNG format. This point is tricky because some browsers are smart enough to process a PNG picture correctly, even when it was wrongly renamed with an ICO extension.
An ICO file can contain several pictures and Microsoft recommends to put 16x16, 32x32 and 48x48 versions of the icon in favicon.ico. For example, IE will use the 16x16 version for the address bar, and the 32x32 for a task bar shortcut.
Declare the favicon with:
<link rel="icon" href="/path/to/icons/favicon.ico">
However, it is recommended to place favicon.ico in the root directory of the web site and to not declare it at all and let the modern browsers pick the PNG icons.
PNG icons
Modern desktop browsers (IE11, recent versions of Chrome, Firefox...) prefer to use PNG icons. The usual expected sizes are 16x16, 32x32 and "as big as possible". For example, MacOS/Safari uses the 196x196 icon if it is the biggest it can find.
What are the recommended sizes? Pick your favorite platforms:
- Most desktop browsers: 16x16, 32x32, "as big as possible"
- Android Chrome: 192x192
- Google TV: 96x96
- ... and others that are more or less documented.
The PNG icons are declared with:
<link rel="icon" type="image/png" href="/path/to/icons/favicon-16x16.png" sizes="16x16">
<link rel="icon" type="image/png" href="/path/to/icons/favicon-32x32.png" sizes="32x32">
...
Beware: Firefox does not support the sizes attribute and uses the last PNG icon it finds. Make sure to declare the 32x32 picture last: it is good enough for Firefox, and that will prevent it from downloading a big picture it does not need.
Also note that Chrome does not support the sizes attribute and tends to load all declared icons. Better not declare too many icons.
Mobile platforms
This question is about desktop favicon so there is no need to delve too much in this topic.
Apple defines touch icon for the iOS platform. iOS does not support non-square icon. It simply rescales non-square pictures to make them square (look for the Kioskea example).
Android Chrome relies on the Apple touch icon and also defines a 192x192 PNG icon.
Microsoft defines the tile picture and the browserconfig.xml file.
Conclusion
Generating a favicon that works everywhere is quite complex. I advise you to use this favicon generator. Full disclosure: I'm the author of this site.
回答2:
16x16 pixels, *.ico format.
回答3:
2019 standards thanks to faviconit
I use faviconit.com for the best browser and device support possible. You upload an image and this site gives you the code, the converted images and a browserconfig file.
We could simply upload a favicon manually to our website of 16x16 and it will probably show up in almost any browser.
But when you will mark it as one of your favorites on your smartphone or tablet, we will need larger images (60x60 to 144x144).
And lets say one of our users creates a shortcut on their desktop. In that case a 196x196 looks better!
Example code of what faviconit would give you, next to all the converted images:
<!-- place this in your <head></head> -->
<link rel="shortcut icon" href="/favicon.ico">
<link rel="icon" sizes="16x16 32x32 64x64" href="/favicon.ico">
<link rel="icon" type="image/png" sizes="196x196" href="/favicon-192.png">
<link rel="icon" type="image/png" sizes="160x160" href="/favicon-160.png">
<link rel="icon" type="image/png" sizes="96x96" href="/favicon-96.png">
<link rel="icon" type="image/png" sizes="64x64" href="/favicon-64.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16.png">
<link rel="apple-touch-icon" href="/favicon-57.png">
<link rel="apple-touch-icon" sizes="114x114" href="/favicon-114.png">
<link rel="apple-touch-icon" sizes="72x72" href="/favicon-72.png">
<link rel="apple-touch-icon" sizes="144x144" href="/favicon-144.png">
<link rel="apple-touch-icon" sizes="60x60" href="/favicon-60.png">
<link rel="apple-touch-icon" sizes="120x120" href="/favicon-120.png">
<link rel="apple-touch-icon" sizes="76x76" href="/favicon-76.png">
<link rel="apple-touch-icon" sizes="152x152" href="/favicon-152.png">
<link rel="apple-touch-icon" sizes="180x180" href="/favicon-180.png">
Since Windows 8
But that is not all. Since windows 8 we are able to create shortcuts to websites with tiles!
<!-- place this in your <head></head> -->
<meta name="msapplication-TileColor" content="#FFFFFF">
<meta name="msapplication-TileImage" content="/favicon-144.png">
<meta name="msapplication-config" content="/browserconfig.xml">
Browserconfig.xml
Upload a file named browserconfig.xml (to enable the tiles in windows >8)
<browserconfig>
<msapplication>
<tile>
<square70x70logo src="/favicon-70.png"/>
<square150x150logo src="/favicon-150.png"/>
<square310x310logo src="/favicon-310.png"/>
<TileColor>#FFFFFF</TileColor>
</tile>
</msapplication>
</browserconfig>
回答4:
Wikipedia has this to say:
Additionally, such icon files can be either 16×16 or 32×32 pixels in size, and either 8-bit or 24-bit in color depth (note that GIF files have a limited, 256 color palette entries).
I think the best way is to use a 32x32 gif and test it with different browsers.
回答5:
The simplest solution is to use one(!) PNG image (in 2019).
Simply add this to the head of your document:
<link rel="shortcut icon" type="image/png" href="/img/icon-196x196.png">
<link rel="shortcut icon" sizes="196x196" href="/img/icon-196x196.png">
<link rel="apple-touch-icon" href="/img/icon-196x196.png">
The last link is for Apple (home screen), the second one for Android (home screen) and the first one for the rest.
Note that this solution does NOT support 'tiles' in Windows 8/10. It DOES support images in shortcuts, bookmarks and browser-tabs.
回答6:
No, you can't use a non-standard size or dimension, as it'd wreak havoc on peoples' browsers wherever the icons are displayed. You could make it 12x16 (with four pixels of white/transparent padding on the 12 pixel side) to preserve your aspect ratio, but you can't go bigger (well, you can, but the browser'll shrink it).
回答7:
favicon.ico is 16x16
<link rel="shortcut icon" href="favicon.ico"/>
And I use these ones to be beautiful in mobile and tablet:
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="img/ico144.png">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="img/ico114.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="img/ico72.png">
<link rel="apple-touch-icon-precomposed" href="img/ico57.png">
It's important to use the name "favicon.ico" in the root because many browsers will try to find there first.
回答8:
Seems like your file should be .ico type.
Check this post about favicons:
http://www.html-kit.com/support/favicon/image-size/
回答9:
A favicon for a website normally has to be a *.ico file and can be 32x32 or 16x16. Using a non-standard size will not work in all browsers, and will appear all distorted like you saw yourself. Try and convert that image using this site: http://www.favicon.cc/ and then try and use it?
回答10:
the format for the image you have chosen must be 16x16 pixels or 32x32 pixels, using either 8-bit or 24-bit colors. The format of the image must be one of PNG (a W3C standard), GIF, or ICO. - How to Add a Favicon to your Site - QA @ W3C
回答11:
The format of favicon must be square otherwise the browser will stretch it. Unfortunatelly, Internet Explorer < 11 do not support .gif, or .png filetypes, but only Microsoft's .ico format. You can use some "favicon generator" app like: http://favicon-generator.org/
回答12:
To help me I use this generator https://realfavicongenerator.net/ It give a lot of option and helper. So you don't worry about your favicon.
回答13:
If you have access to Photoshop, check this out:
http://www.photoshopsupport.com/tutorials/jennifer/favicon.html
This tutorial links to a plugin that allows Photoshop to save ico files natively, and then provides info on favicon standards.
When I first started doing favicons, the rule was a 16x16 8-bit ico file. If you want to make sure the favicon works in the most browsers, I'd stick with that.
来源：https://stackoverflow.com/questions/2268204/favicon-dimensions