When I’m creating a WordPress blog or website, I usually look first for a responsive theme. What’s “responsive”? That simply means that the design will recognize and adapt (or “respond”) to the device it’s being viewed on, whether a desktop mega-monitor, an iPad, or a smart phone.
For example, here’s what the responsive theme Anthem looks like on three different devices:
As you can see, when the browser window gets smaller, the page layout changes, by getting rid of the sidebar and then reducing the size of the images.
Free responsive themes:
Ari
See the theme on wordpress.com
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Blaskan
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Bouquet
No summary.
See the theme on wordpress.com
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Chateau
See the theme on wordpress.com
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Fresh & Clean
See the theme on wordpress.com
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Grisaille
See the theme on wordpress.com
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Origin
See the theme on wordpress.com
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MIxfolio
See the theme on wordpress.com
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Oxygen
See the theme on wordpress.com
Having trouble getting your Oxygen theme to work? Here are some helpful tips.
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Quintus
Summary to come.
See the theme on wordpress.com
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Reddle
Summary to come.
See the theme on wordpress.com
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Skylark
See the theme on wordpress.com
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Sundance
Especially for video display. Summary to come.
See the theme on wordpress.com
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Sunspot
Summary to come.
See the theme on wordpress.com
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Twenty Eleven (note: this site is built on this theme)
Summary to come.
See the theme on wordpress.com
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Yoko
See the theme on wordpress.com
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Jana Snyder 
Thanks so much for sharing these. I was looking for information on free responsive themes and these are all great. Any of these would make a huge difference to a blog’s look, feel and readability. This is just the kind of thing I need. I hope others find these as useful as I have. Thanks again!