With options for 64GB, 128GB, and 256GB, the Samsung Galaxy S9 has you covered no matter your storage needs. However, should you buy the phone and realize you need more space after the fact, the S9's microSD card slot makes it easy to upgrade your storage at any time. There are a ton of microSD cards out there to choose from, but without a doubt, these are the very best ones you can get.

Best under $10

Samsung 32GB EVO Select

Even the base 64GB Galaxy S9 offers plenty of space out of the box, so if you just need a bit more wiggle room, 32GB is a really good affordable option. The read and write speeds of 95Mb/s and 20Mb/s aren't the fastest around, but the card should still work well for photos, videos, and a few apps.

$7.49 at Amazon

Durable and fast

SanDisk Extreme 64GB

64GB is a lot of extra space for your phone, and for most people, will be more than enough. This card is a bit pricier than competing 64GB options, but that's because its read and write speeds of 90Mb/s and 60Mb/s are some of the best around for 4K video and high-res photos. Also, as the "Extreme" name suggests, it's built to withstand just about anything you throw at it.

$31 at Amazon

Best overall pick

Samsung 128GB EVO Plus

The rugged nature of Sandisk's 64GB card is great, but if you want to stretch your money even further, Samsung's Evo Plus offers 128GB of space, 100Mb/s read speeds, and 90Mb/s write speeds for even less at a little over $30. It's honestly tough to do much better than this.

$32

Good middleground

Sandisk Ultra 200GB

Want more storage than 128GB but don't necessarily feel like spending $60? The Sandisk Ultra 200GB is a good option in between the 128GB and 256GB cards on this list. It has way more storage than most people likely need, and at $50, it's a little easier on the wallet.

$50 at Amazon

For powerhouse users

Samsung Evo Plus 256GB

256GB is definitely more than enough on top of the storage already in your Galaxy S9, but if you shoot a lot of 4K video, take lots of pictures, and like downloading music/movies, this will give you all of the space you need (and then some!). Read and write speeds are also great at 100Mb/s and 90Mb/s, respectively.

$60 at Amazon

Most space possible

PNY Elite 512GB

I'm honestly not sure how you'd fill up a 512GB card, but if you think you need that much space, you can get it. With 512GB, you can store up to 100,000 18MP photos or 80+ hours of full HD video. And, if you want to take this storage to your computer, there's a SD adapter that's included for free.

$349 at Amazon

If you're shopping for a microSD card for your Galaxy S9, these are the ones we recommend looking at first. Some people may just need a little extra wiggle room with the 32GB card, and while most people probably won't fill up the S9's internal space and another 512GB on top of that, it's nice to know that all of these options exist. For most people, the Samsung 128GB EVO Plus card will be the best pick thanks to its great balance of speed, increased storage space, and price.

This post may contain affiliate links. See our disclosure policy for more details.