No, your Galaxy Z Fold6 case won't fit the Galaxy S21 Ultra
The Galaxy Z Fold6 (153.5×68.1mm) and Galaxy S21 Ultra (165.1×75.6mm) differ too much for cases to be compatible.
Does a Galaxy Z Fold6 Case Fit Galaxy S21 Ultra?
Last verified: March 2026
No, a Galaxy Z Fold6 case will not fit the Galaxy S21 Ultra. The phones have different dimensions that make cases incompatible.
Your Galaxy Z Fold6 case will NOT fit the Galaxy S21 Ultra. Here's why:
- •Camera module layout is different — cutout won't align
| Spec | Galaxy Z Fold6 | Galaxy S21 Ultra | Diff |
|---|---|---|---|
| Height | 153.5mm | 165.1mm | Galaxy S21 Ultra +11.6mm |
| Width | 68.1mm | 75.6mm | Galaxy S21 Ultra +7.5mm |
| Thickness | 12.1mm | 8.9mm | Galaxy Z Fold6 +3.2mm |
| Camera Layout | vertical-triple | vertical-quad | Different |
| Port | usb-c | usb-c | Same |
Your Galaxy Z Fold6 case won't fit the Galaxy S21 Ultra. Find the right case:
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Size Comparison
Wireless Charging & MagSafe
Wireless chargers work with both phones, but magnetic snap varies.
- Both devices support wireless charging. Standard Qi/Qi2 chargers work with either phone.
Galaxy Z Fold6
Qi only
15W max
Galaxy S21 Ultra
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.
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Frequently Asked Questions
Are Galaxy Z Fold6 and Galaxy S21 Ultra the same size?
Galaxy Z Fold6 measures 153.5×68.1×12.1mm while Galaxy S21 Ultra measures 165.1×75.6×8.9mm. They are different sizes.
Can I use a Galaxy Z Fold6 screen protector on Galaxy S21 Ultra?
Edge types differ (flat vs curved) — screen protector won't adhere properly.
What's different between Galaxy Z Fold6 and Galaxy S21 Ultra dimensions?
The height differs by 11.6mm, the width by 7.5mm, and thickness by 3.2mm. The camera module layout is also different.
Do I need a new case for Galaxy S21 Ultra?
Yes, you'll need a new case. The Galaxy S21 Ultra has different dimensions than the Galaxy Z Fold6, so cases are not interchangeable.
Will Galaxy Z Fold6 accessories work with Galaxy S21 Ultra?
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.
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