wordpress: managing settings

Media

Image sizes: When you upload an image to a WordPress site, the system automatically creates a thumbnail version of it (for use on index pages and in galleries) and a medium size version for use in story bodies, if the full-size version is too large. This means you don't always need to resize your images in Photoshop before uploading (though it's generally still a good idea). This page let you control the sizes at which WordPress should do its resizing for each of the three versions.

Settings Media Sizes

Embeds: Many sites, such as Flickr and YouTube, provide "embed code" - chunks of HTML and Javascript that can be pasted into other sites, so that media from the external site is embedded directly into the blog. That's wonderful, but comes at a price - allowing arbitrary embed code can be very dangerous, since it could be manipulated to include malware. Therefore, WordPress only lets users with the Admin role embed this code into posts.

Of course, normal authors want to be able to embed legitimate external media too! To get around this problem, WordPress 3 supports an emerging protocol called oembed. With this system, the post author only needs to paste in the URL of the page that hosts the external media, not the actual embed code itself. When WordPress detects this, it reaches out and grabs the actual code to embed in the post. Therefore, there is no risk of bad things happening, and normal authors can safely embed external images and videos. Be sure to turn this option on - it rocks!

Oembed1
To embed media from external sites with the oembed option enabled, just paste in the URL, NOT the embed code! This lets unprivileged users embed external media, not just admins.

Oembed2
WordPress scans the URL, determines that embeddable code lives at the end-point, fetches it and inserts it automatically.

Uploading Files: By default, all directly uploaded media is added to the wp-content/uploads folder on the server. Don't change this unless you know what you're doing, and its potential impact on existing images. You should also definitely keep the "Organize into month- and year-based folders" option enabled - if you don't, and you upload a lot of media, you'll end up with a single folder cluttered with thousands of files over time. Trust me - you don't want that :)