You can easily batch resize groups of images within Mac OS X by using the included Preview app, that is, taking a group of pictures set at one or various resolutions, and collectively resize them all together in a group to a new resolution, outputting either as the same file or as a new file saved at the newly desired resolution. Long ago you had to buy expensive third party software for this purpose, but no longer is there a need for any additional downloads or expensive photo editing applications to perform these tasks on a Mac. Instead you only need Preview, which is free with every Mac and every version of Mac OS X!

Here is how to use Previews’ powerful yet easy batch image resize feature to change the resolution of multiple files in one fell swoop, all in a few simple steps.

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It’s that time of year again, the holiday season is upon us! What better way to celebrate than to download a hoard of free Christmas songs from Apple, courtesy of iTunes?

From Barry Manilow to Amy Grant to Weezer to Aretha Franklin, this is quite a diverse set of holiday songs that are sure to get you in the spirit. Head on over to Apple, launch the link in iTunes, and enjoy your free music!

Apple iTunes: Holiday Sampler Album – 20 free songs

Finder, the Mac OS X file system browser, is ultimately just a nice looking GUI application, and it can be interacted with fluidly from the command line.

This means you can jump to directories and open literally any Mac Finder window directly from the terminal by using a simple command string based upon the ‘open’ command.

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You can reset a lost Administrator (the original account you created) password in Mac OS X by utilizing a Mac OS X installation DVD, here’s how:

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This is a fantastic tip from Apple regarding your iPhone, particularly if you’re prone to losing your device… set a custom background image on your iPhone with some contact information and an “If Found” note.

What does that mean exactly? Basically just create an image with some contact details on it and a message to someone who potentially finds the misplaced device. Try a message like the following, of course filling it with your appropriate name, address, phone number, and maybe an email address too:

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Ever wondered how to type the temperature / degree symbol in Mac OS? Typing the degrees symbol on a Mac, or any computer, may seem like a giant mystery since it’s not immediately visible on any keyboard, but it’s really quite easy if you know the proper keyboard shortcut.

There are actually two keyboard shortcuts for typing degree signs in MacOS and Mac OS X, and you can insert the degree temperature symbol into any Mac OS X app where your cursor is located by hitting one of the the following keystroke commands, depending on which symbol you want to show:

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Secrets is a pretty nifty system preference panel add-on that lets you access all sorts of hidden ‘secret’ preference options. Instead of typing a bunch of default write commands you can basically just click checkboxes or change dropdown options to easily enable some pretty cool stuff.

It’s pretty comprehensive, with a bunch of options for Safari, Dock, Finder, Xcode, and so much more. There’s really too much to list, so if you like tweaking with your Mac’s settings, install secrets to make your life easier.

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Knowing how to clear cookies is pretty important for any number of reasons, be it for personal preference or troubleshooting issues with websites. You may be wondering how to remove cookies on a Mac running the Safari web browser, and that is exactly what we’ll show how to do. There are actually a few ways to delete cookies in Safari on Mac OS X, we’ll show you how to delete all cookies from Safari, and how to delete specific site cookies from Safari on Mac too.

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With the pbcopy and pbpaste commands, you can use the command line to manipulate clipboard contents but also access your Mac OS X clipboard directly through the Terminal. Yes, that means you can access what you copied in a GUI app and use it in the command line seamlessly, and vice versa. We’ve shown a brief introduction on how to use both pbcopy and pbpaste from the command line before, but we wanted to demonstrate a few additional methods to use these incredibly useful tools on the Mac, like how to directly access whatever is currently stored in the Macs clipboard from the terminal prompt.

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Google Chrome is out in beta for Mac OS X and although it’s relatively barebones, it seems pretty stable and certainly is fast. I still prefer Safari overall but I am glad Google Chrome is finally on the Mac platform in a usable release. Google also announced their public Chrome Extensions set today, which was previously closed off just to developers. The Gmail extension is a nice addition but I’m really hoping for something like Firebug for Chrome so that I can finally ditch my Firefox bloatware, and then I’ll be able to just run Safari and Chrome… one can dream!

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Google Chrome Extensions

If you’re having trouble installing Chrome Extensions on your Mac, check out this guide on TechCrunch for a workaround.

One of the quickest ways to get your external IP address in Mac OS X or unix is by launching the Terminal and typing one of the following commands with curl. To be perfectly clear here, we’re looking for the external public IP address of the hardware in use, this is what broadcasts to the world, this is not the same as a LAN IP or local IP, which is usually not public.

To get started open the command line and choose one of the syntax approaches below to retrieve an external IP.

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With a little bit of hacking and modification, you can add up to 24 additional visual effects to iChat video conferencing and Photo Booth! A reader pointed out this very cool Mac OS X mod and if you like to play around with Photo Booth or iChat effects it’s worth the effort, since it gives you some new nifty options.

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You can quickly clear all of the text from the Spotlight menu without closing the window by hitting Command-Delete, I discovered the use in this after my cat walked across my keyboard entering in a lengthy mishmash string of characters. Try it out!

You can schedule your Mac to sleep, wake, shutdown, or boot up at any time or any regular interval using the Mac System Preference ‘Energy Saver’ schedule settings. This provides for an excellent option for work Macs that you want to be awake or boot when you arrive in the morning, and to sleep or shut down at a provided time when you leave in evening. Of course there are tons of other uses for the overlooked scheduling feature, so let’s learn how to set up this up.

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The Mac OS X Preview application has a a few little known image adjustment features for rapid image orientation flipping or rotation that are quite powerful, and if you’re looking to make quick adjustments to rotate a picture or mirror vertically or horizontally the general orientation of any image file, a great Mac app to do so is bundled on every MacOS and Mac OS X machine from the get go with Preview.

Using the app to complete these tasks is quick and easy, here’s how to adjust orientation of either a single picture or multiple pictures at the same time.

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You can convert m4a music files to mp3 format very easily by using the same program that creates m4a files… iTunes! Yes that’s right, iTunes can double as a music file conversion program, and in this case it’s one of the easiest ways known to convert m4a to mp3 that doesn’t require any additional software downloads.

This audio format conversion trick works in all versions of iTunes on any computer whether it’s an OS X Mac or Windows PC.

We’ll walk through each necessary step to convert m4a files to mp3 format with the iTunes application, let’s begin the tutorial.

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Want to navigate within a websites directory structure? If you use Safari then you can Command+Click the Title of any website window in Safari and you can pull up a nice navigable drop-down list of the websites directory paths.

This is really handy if you’re deep in some archive or if you’re looking at an image and want to cut down to the parent directory.

Note this particular trick only applies to versions of Safari on Mac where the title bar is visible on of a website, which is generally on older versions of Safari for older versions of Mac OS X. Modern Mac OS versions have simplified the Safari interface to show the URL and search bar within the title, and instead page titles are part of tabs or in a tab bar, where command+clicking does not do anything on those versions. There may be a way around that, if you know if it share with us in the comments of course.

Regardless of whether or not a particular Safari version supports this trick, this tip also works in a similar way in the Finder of Mac OS X too and that applies to basically every version of Mac OS released, so try it there too!

I’m a procrastinator with holiday shopping, and anything I can do online makes my life easier. Unfortunately when waiting until the last minute, you often lose out on having things shipped in time, but thankfully Apple has a new service that will help this situation. Between December 15 and December 24, you can order products online with Apple and pick them up at an Apple store, even having them gift wrapped for you. Cool!

Apple.com: Reserve & Pick Up