Best 256GB MicroSD Cards in 2026: 10 Cards Ranked and Tested

With more than 175,000 ratings, the SanDisk Ultra is not just the most reviewed 256GB microSD card on Amazon, it's one of the best 256GB microSD cards you can buy if your main use is an Android phone or tablet rather than a 4K camera. It's rated UHS-I, Class 10 and U1, with read speeds up to 150MB/s that make transferring photos and video off the card quick, without paying for write speeds a phone rarely pushes.

The A1 rating is the detail worth paying attention to: it means the card is specifically optimised for running apps directly from it, so games and apps installed to the SD card load and update faster than on a card without that certification. SanDisk's free Memory Zone app for Android also handles file management and backups from the card without needing a computer.

At £34.99 it's one of the cheapest cards on this list and by far the most proven, with a review count that dwarfs everything else here. It's a straightforward, safe choice if you just want reliable, fast-enough storage for a phone, tablet or basic camera.

Amazon's own card sits a step above basic storage thanks to its A2 certification, which covers not just app loading but responsive multitasking, so it holds up better than an A1 card when you're running several apps from it at once. UHS-I U3 speed class and up to 100MB/s read speeds make it capable of high-bitrate 4K recording and burst-mode photography without dropping frames.

It's built for rougher use than most cards here: Amazon rates it shock-resistant, IPX6 water-resistant, and safe from -10°C to +80°C, plus resistant to X-rays and magnetic fields, which suits it to dashcams and outdoor gear as well as a phone. It's also compatible with the original Nintendo Switch, though not the Switch 2.

One thing worth knowing before you buy: usable capacity is always a little under the labelled figure due to formatting overhead, so this 256GB card gives roughly 232GB of real-world space, a normal trait shared by every card on this list rather than something unique to Amazon Basics.

The Extreme PRO is built for people who actually need the speed a memory card can offer, not just the capacity. SanDisk's QuickFlow Technology drives read speeds up to 200MB/s, the fastest of any card in this list, so offloading a full card of 4K footage or RAW photos takes noticeably less time than on a standard UHS-I card.

Write speeds of up to 140MB/s matter just as much in practice: they're what let you shoot fast-action burst photography or 4K UHD video without the card becoming the bottleneck. It also carries an A2 rating, so app performance stays strong if you use it in a phone as well as a camera.

Like the rest of the SanDisk range here, it's shockproof, temperature-proof, waterproof and X-ray-proof, and SanDisk positions it specifically for outdoor adventures, weekend trips and sporting events where you can't afford to miss a frame while the card catches up.

The 2024 EVO Select is Samsung's speed-optimised pick for smartphones and tablets, rated UHS-I U1 with read speeds up to 160MB/s, which Samsung positions specifically for 4K UHD and super slow-motion recording rather than just general storage.

256GB is enough for roughly 15 hours of 4K UHD video or around 135,000 photos, so it's built with content creators in mind as much as everyday phone storage. Samsung backs it with six-fold protection: waterproof, temperature-resistant, X-ray-proof, magnetic-resistant, fall-proof and wear-free, which is a longer list of durability claims than most rivals here list explicitly.

It ships with SD adapters for a number of different devices, so the same card works across a camera, laptop card reader or tablet without buying a separate adapter. It's the second most expensive card on this list, but it also shares the joint-highest rating with the Extreme PRO.

Biwin is less of a household name than SanDisk or Samsung, but the company has been making storage and memory components for other manufacturers' devices for decades, and the MS100 is its own consumer-facing card. It's rated UHS-I U3 and V30, with read speeds up to 100MB/s aimed squarely at high-definition photo and video capture.

It's pitched as a genuine multi-device card rather than a phone-first one: Biwin lists smartphones, tablets, home security cameras and dash cams as target uses, and it's built to withstand harsh temperatures, dust, shock and X-rays for anyone using it outdoors or in a vehicle.

With fewer than 400 ratings, it has far less of a track record than the bigger brands on this list, so it's a reasonable pick if you want V30 video performance at a mid-range price, but it comes with less social proof behind it than the established names here.

At £33.99 the Netac is the cheapest card in this ranking, and with over 12,500 ratings it has a solid track record for the price. It supports the UHS-I interface at speed class U1/V10, with read speeds up to 100MB/s, and carries an A1 rating good for 1,500 read IOPS and 500 write IOPS, which Netac says is enough for loading apps quickly and storing documents, photos and video.

It's built to survive rough handling: Netac lists it as shockproof, waterproof, temperature-proof and magnetic-proof, and specifically notes it will keep working after going through airport security X-ray scanners, a detail worth knowing if you travel often with a dash cam or drone.

The one figure that stands out against the rest of this list is its write speed, quoted at just 30MB/s. That's fine for everyday photos and phone storage, but it's the slowest write speed of any card here, so it's not the one to reach for if you're shooting continuous 4K footage.

Integral doesn't have the brand recognition of SanDisk or Samsung, but with over 55,000 ratings here and more than 50 million cards sold worldwide, it's a genuinely established name in memory cards rather than a newcomer. This card is rated UHS-I, U3 and Class 10, with up to 100MB/s read and 50MB/s write speeds, comfortably enough for seamless 4K UHD and Full HD video recording.

The A1 rating covers app performance, so it's a sensible choice for a phone or tablet where you want games and apps to load quickly from the card as well as store media. Integral also lists it as compatible with drones, action cameras and game consoles, not just phones.

It's rated water-resistant, shockproof, temperature-resistant and X-ray-proof, matching the durability claims of pricier cards on this list, and at £37.95 it undercuts most of them while carrying a stronger review count than all but the SanDisk Ultra.

Most cards on this list market themselves generically as suitable for dash cams among other devices; the Gigastone High Endurance Pro Series goes further and lists specific dash cam brands it's built to work with, including REDTIGER, ROVE, VIOFO, Vantrue, Pruveeo and Arifayz. That's a genuinely useful detail if constant overwrite-recording has chewed through cheaper cards before.

It's rated for up to 100MB/s read and 60MB/s write speeds with 4K Ultra HD recording and playback, and beyond dash cams it works as general storage for laptops, tablets, PCs, smartphones, cameras and e-readers. Gigastone rates it waterproof, shockproof, temperature-proof and X-ray-proof, the same durability checklist as the rest of this list.

The set comes with a Micro SD to SD adapter and a mini case included, and Gigastone backs it with a 5-year limited warranty. With only 128 ratings so far it's the least proven card here for its price, so it earns its place on endurance-focused specialisation rather than sheer popularity.

The Superior Pro covers the same speed classes as most of the mid-range cards here, UHS Speed Class 3 and Video Speed Class 30, with quoted read and write speeds of up to 100MB/s and 80MB/s over a UHS-I interface. Silicon Power notes that speeds drop to up to 80MB/s read and 20MB/s write on devices that only support the older UHS-1 interface, so real-world performance depends partly on what you plug it into.

It's broadly compatible with smartphones, tablets, drones, action cameras and DSLRs, and Silicon Power specifically calls out Nintendo Switch compatibility as a budget-friendly way to add storage to the console. A 5-year limited manufacturer warranty backs the card.

At 4.2 it carries the lowest average rating on this list, and with only 419 ratings it's also one of the less-reviewed picks, so it's worth treating as a value option for a Switch or basic camera rather than a first choice for demanding 4K work.