5 Best Micro SD Card for Samsung A21s for Photos
The Samsung EVO Select MB-ME256KA/AM microSD Card + Adapter is the best micro sd card for samsung a21s for most buyers because its 256GB capacity gives your phone plenty of room for photos, videos, apps, and music. Its included adapter also lets you move files to a laptop or other compatible device without buying another accessory.
This guide is for Galaxy A21s owners who need more storage than the phone’s built-in space provides. For this type of memory card, capacity and rated speed matter most. A 128GB or 256GB card offers useful room, while a UHS-I card with a suitable speed rating helps transfer apps and large video files more smoothly. The five picks below are ranked by value and fit, with clear reasons and honest drawbacks for each, so you can choose a card that matches your storage needs and budget.
Quick Comparison
| # | Product | Best For | Price | |
|---|---|---|---|---|
| 1 | Samsung EVO Select MB-ME256KA/AM microSD Card + Adapter | High-Capacity Phone Storage | ~$64 | View → |
| 2 | BigBuild Technology 32GB microSDHC Memory Card | Budget Dash Cam Recording | ~$27 | View → |
| 3 | Samsung EVO Plus microSDXC Card (MB-MC64DA/AM) | Everyday Tablet Expansion | ~$36 | View → |
| 4 | BigBuild Technology 32GB microSDHC Memory Card | Spare Camera Memory | ~$23 | View → |
| 5 | BigBuild Technology 128GB microSDXC Memory Card | Large Game Console Storage | ~$54 | View → |
5 Top microSD Cards for the Galaxy A21s
This ranked list counts down from practical everyday options to the top pick for expanding your Galaxy A21s storage.
5. BigBuild Technology 128GB microSDXC Memory Card
Best for: Samsung phone storage expansion
This 128GB microSDXC card adds storage to the Samsung Galaxy A20, A20e, A20s, A21, and A21s. It uses UHS-I, U3, and Class 10 ratings, so it suits Android apps, photos, music, maps, and video files. The card also supports devices such as tablets, action cameras, dash cams, and navigation units, provided they accept 128GB microSDXC media.
The package includes a microSD-to-SD adapter for cameras, camcorders, and laptops. It also comes with a USB 2.0 microSD reader for transferring files to a computer. BigBuild lists read speeds up to 100MB/s through USB 3.0, with write speeds around 30MB/s to 70MB/s. Through USB 2.0, transfers top out at roughly 18MB/s. Around $54, it costs more than many basic 128GB cards, so the included accessories matter. Speed also depends on the host device, reader, files, and connection.
Pros
- 128GB provides room for photos, videos, apps, music, and maps.
- U3 and Class 10 ratings suit high-resolution video and burst photos.
- SD adapter and USB reader support cameras and computers.
Cons
- USB 2.0 limits transfers to about 18MB/s.
- The listed speed range depends on the device and connection, and some phones may not support every advertised use.
4. BigBuild Technology 32GB microSDHC Memory Card
Best for: Adding storage to Samsung Galaxy phones
The BigBuild Technology card provides 32GB of removable storage for the Samsung Galaxy A10, A10e, A10s, A11, A12, and A13. It uses the microSDHC format with UHS-I and Class 10 ratings, making it suitable for photos, music, Android apps, and HD video. A microSD-to-SD adapter is included for compatible cameras, camcorders, laptops, and card readers.
The listed read speed reaches up to 80MB/s through a USB 3.0 connection, while write speed reaches up to 20MB/s. With USB 2.0, both speeds drop to about 18MB/s because the port limits performance. A high-end controller is designed to support steady operation and device compatibility, but actual results depend on the phone, adapter, and files used. The card operates from 0°C to 70°C and stores from -25°C to 85°C. Around $23, it costs less than many higher-capacity cards, though 32GB fills quickly with video.
Pros
- Adds 32GB of space for photos, apps, music, and HD video.
- Includes an SD adapter for laptops, cameras, and camcorders.
- Supports up to 80MB/s reads through USB 3.0 equipment.
Cons
- The 32GB capacity may feel limited for large video collections.
- USB 2.0 connections reduce read and write speeds to about 18MB/s.
3. Samsung EVO Plus microSDXC Card (MB-MC64DA/AM)
Best for: Android phones and Full HD video
The Samsung Evo Plus is a 64GB microSDXC memory card for phones, tablets, cameras, and other compatible devices. It carries a Class 10 rating and lists transfer speeds of up to 80MB/s, giving it enough capacity for Full HD video, high-resolution photos, music, and mobile games. The package includes an adapter, so the tiny card can also fit devices with a standard SD slot. At around $36, it costs more than some basic 64GB cards, but the added adapter and protection ratings may suit buyers who move the card between devices.
Its broad device support is the main draw. It works with Micro SDHC and Micro SDXC slots, though the host device must support the card’s format and capacity. Samsung lists protection against water, temperature changes, X-rays, and magnetic exposure. Those safeguards can reduce the risk from common travel and storage mishaps, but they cannot prevent every type of data loss. The 80MB/s figure is a maximum transfer rate, not a guaranteed speed in every phone, tablet, or reader.
Pros
- 64GB provides useful space for Full HD video, photos, music, and games.
- Up to 80MB/s transfer speed can make file transfers quicker.
- Included adapter supports devices with a standard SD slot.
Cons
- The 80MB/s rating is a maximum, and actual performance depends on the device and reader.
- It requires a compatible Micro SDHC or Micro SDXC slot, so older devices may not support it.
2. BigBuild Technology 32GB microSDHC Memory Card
Best for: Expanding storage on compatible Samsung phones
This 32GB microSDHC card adds removable storage to the Samsung Galaxy A20, A20e, A20s, A21, and A21s. It uses UHS-I and Class 10 ratings, making it suitable for Android apps, high-resolution photos, and HD video recording. The included microSD-to-SD adapter also lets you use the card with a camera, camcorder, laptop, or other SD-compatible device.
The listed read speed reaches up to 80MB/s through a USB 3.0 reader, while write speeds reach up to 20MB/s. Those numbers depend on the reader, device, and files being transferred. With USB 2.0, read and write speeds drop to about 18MB/s. A high-end controller is designed to support sustained minimum speeds and broad compatibility, though it cannot remove limits from older phones or slower equipment. The card operates from 0°C to 70°C and can be stored from -25°C to 85°C. At around $27, it costs more than many basic 32GB cards.
Pros
- Adds 32GB of extra storage to five listed Samsung Galaxy models.
- Supports up to 80MB/s read speeds with a USB 3.0 reader.
- Includes an SD adapter for laptops, cameras, and camcorders.
Cons
- USB 2.0 transfers may fall to about 18MB/s, limiting performance on older equipment.
- The 32GB capacity may fill quickly with HD videos, large photo libraries, or offline apps.
1. Samsung EVO Select MB-ME256KA/AM microSD Card + Adapter
Best for: Android phones and Switch owners
The Samsung EVO Select is a 256GB microSDXC card with a full-size SD adapter. It gives compatible Android phones, tablets, cameras, and Nintendo Switch consoles more room for photos, videos, games, and apps. Its UHS-I interface supports read speeds up to 130MB/s, while U3 and Class 10 ratings suit large files and high-bitrate video. The listed price is around $64, though prices change.
Its A2 app rating can help supported devices load and manage apps more efficiently. The V30 rating also makes it a reasonable choice for 4K UHD recording, provided the host device supports those standards. Samsung lists protection from water, extreme temperatures, X-rays, magnets, drops, and everyday wear. The microSD card comes with a 10-year limited warranty, but that coverage does not include the adapter. Capacity options range from 64GB to 512GB, so the 256GB version offers a middle ground for larger game libraries and media collections.
Pros
- 256GB capacity provides substantial room for games, apps, photos, and video.
- U3, V30, A2, and Class 10 ratings support demanding storage tasks.
- Protective coverage includes water, temperature, X-ray, magnet, drop, and wear resistance.
Cons
- The 130MB/s top speed depends on the device, reader, and file type.
- The 10-year warranty covers the card, not the included adapter.
Buying Guide
The most important factor is compatibility. The Galaxy A21s supports microSD cards up to 512GB, so choose a genuine microSDXC card that matches the phone’s storage limit.
- Capacity: 128GB suits most users, while 256GB works better for large photo libraries, offline music, and video. Choose 512GB only if you need maximum space.
- Speed rating: Look for UHS-I and at least Class 10. A U1 card is enough for photos and Full HD video, while U3 or V30 gives extra performance for frequent recording.
- Reliability: Buy from a major brand and an authorized retailer. SanDisk, Samsung, Kingston, and Lexar offer suitable options, but counterfeit cards remain common on marketplace listings.
- Durability: Choose a card rated for water, temperature, shock, and magnetic resistance. A five-year or lifetime limited warranty adds useful protection.
- Price: Expect to pay about $10–$18 for 128GB, $18–$30 for 256GB, and $35–$60 for 512GB. Prices vary during sales, but unusually cheap cards deserve caution.
If you cannot have everything, prioritize genuine compatibility and a reliable brand before chasing the highest speed rating.
Frequently Asked Questions
How much storage can the Samsung Galaxy A21s support?
The Samsung Galaxy A21s supports a microSD card with up to 512GB of storage. A 128GB or 256GB model suits most owners, while a 512GB option fits large photo, video, and music libraries. Choose a reputable UHS-I card with a published warranty, rather than an unverified high-capacity listing.
What speed microSD card does the Galaxy A21s need?
A Class 10, UHS-I microSD card provides the appropriate everyday speed for the Galaxy A21s. Look for U1 or U3 markings, though U3 is unnecessary for normal phone use. A1-rated cards can also help with app-related tasks, but card quality and genuine capacity matter more than peak claims.
Can the Samsung A21s use a 1TB memory card?
No, the Galaxy A21s is rated for microSD cards up to 512GB, so a 1TB card exceeds Samsung’s listed limit. A 512GB card is the safer maximum choice. Format compatibility, card authenticity, and proper insertion also matter, especially when buying from marketplace sellers.
Are expensive microSD cards worth buying for the A21s?
Usually not; a reliable 128GB or 256GB microSD card offers better value than a premium model with extreme speed ratings. Those capacities provide room for thousands of photos and many hours of compressed video. Spend extra on a known brand, warranty, and seller instead of unused performance.
Conclusion
Samsung EVO Select MB-ME256KA/AM microSD Card + Adapter is the strongest pick for Samsung Galaxy A21s owners who want dependable extra storage at a practical 256GB capacity. If your priority is spending less or storing only photos and a few apps, choose a 128GB card instead; if you need more room for video, consider a compatible 512GB model. Before buying, double-check the card’s size, Galaxy A21s compatibility, package quantity, and current price, since listings can change and some bundles include an adapter while others do not. The included adapter also helps transfer files to laptops and other devices. For most users, 256GB offers a sensible balance between room, cost, and everyday use.
