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No, your Galaxy S21 Ultra case won't fit the Galaxy S25 FE

The Galaxy S21 Ultra (165.1×75.6mm) and Galaxy S25 FE (161.3×76.6mm) differ too much for cases to be compatible.

Does a Galaxy S21 Ultra Case Fit Galaxy S25 FE?

Q: What's different between Galaxy S21 Ultra and Galaxy S25 FE dimensions?

The Galaxy S21 Ultra is 165.1mm tall and 75.6mm wide, while the Galaxy S25 FE is 161.3mm tall and 76.6mm wide. Camera module layout is different — cutout won't align

Last verified: March 2026

No, a Galaxy S21 Ultra case will not fit the Galaxy S25 FE. The phones have different dimensions that make cases incompatible.

0Won't Fit

Your Galaxy S21 Ultra case will NOT fit the Galaxy S25 FE. Here's why:

•Camera module layout is different — cutout won't align

Spec	Galaxy S21 Ultra	Galaxy S25 FE	Diff
Height	165.1mm	161.3mm	Galaxy S21 Ultra +3.8mm
Width	75.6mm	76.6mm	Galaxy S25 FE +1.0mm
Thickness	8.9mm	7.4mm	Galaxy S21 Ultra +1.5mm
Camera Layout	vertical-quad	vertical-triple	Different
Port	usb-c	usb-c	Same

⭐Based on Amazon best-seller rankings and ratings

Your Galaxy S21 Ultra case won't fit the Galaxy S25 FE. Find the right case:

🛡️Best Galaxy S25 FE Cases→🔒Rugged Cases for Galaxy S25 FE→✨Clear Cases for Galaxy S25 FE→👛Wallet Cases for Galaxy S25 FE→

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Size Comparison

Galaxy S21 UltraGalaxy S25 FE

Wireless Charging & MagSafe

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Wireless chargers work with both phones, but magnetic snap varies.

Both devices support wireless charging. Standard Qi/Qi2 chargers work with either phone.

Galaxy S21 Ultra

Qi only

15W max

Galaxy S25 FE

Qi only

15W max

MagSafe cases are NOT cross-compatible between these devices — the case body is shaped to each phone, even though the internal magnet ring may be the same.

See all cases for Galaxy S25 FE →

🎁 Buying a case as a gift? Use our Gift Finder →⚡ Need a charger for your Galaxy S25 FE? Check charger compatibility →

Does the screen protector fit? Galaxy S21 Ultra → Galaxy S25 FE Compare sizes: Galaxy S21 Ultra vs Galaxy S25 FE

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Frequently Asked Questions

Are Galaxy S21 Ultra and Galaxy S25 FE the same size?

Galaxy S21 Ultra measures 165.1×75.6×8.9mm while Galaxy S25 FE measures 161.3×76.6×7.4mm. They are different sizes.

Can I use a Galaxy S21 Ultra screen protector on Galaxy S25 FE?

Edge types differ (curved vs flat) — screen protector won't adhere properly.

What's different between Galaxy S21 Ultra and Galaxy S25 FE dimensions?

The height differs by 3.8mm, the width by 1.0mm, and thickness by 1.5mm. The camera module layout is also different.

Do I need a new case for Galaxy S25 FE?

Yes, you'll need a new case. The Galaxy S25 FE has different dimensions than the Galaxy S21 Ultra, so cases are not interchangeable.

Will Galaxy S21 Ultra accessories work with Galaxy S25 FE?

Chargers and cables are compatible since both phones use the same usb-c port. Both support wireless charging, so wireless chargers work with either phone. Cases and screen protectors depend on exact dimensions — check our compatibility results above.

Want to check another phone?

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