No, your OnePlus 13 case won't fit the Galaxy S21
The OnePlus 13 (162.9×76.5mm) and Galaxy S21 (151.7×71.2mm) differ too much for cases to be compatible.
Does a OnePlus 13 Case Fit Galaxy S21?
Last verified: March 2026
No, a OnePlus 13 case will not fit the Galaxy S21. The phones have different dimensions that make cases incompatible.
Your OnePlus 13 case will NOT fit the Galaxy S21. Here's why:
- •Camera module layout is different — cutout won't align
| Spec | OnePlus 13 | Galaxy S21 | Diff |
|---|---|---|---|
| Height | 162.9mm | 151.7mm | OnePlus 13 +11.2mm |
| Width | 76.5mm | 71.2mm | OnePlus 13 +5.3mm |
| Thickness | 8.5mm | 7.9mm | OnePlus 13 +0.6mm |
| Camera Layout | circular-triple | vertical-triple | Different |
| Port | usb-c | usb-c | Same |
Button & Port Alignment
- •Old phone has alert slider — new phone does not
Your OnePlus 13 case won't fit the Galaxy S21. 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.
OnePlus 13
Qi only
15W max
Galaxy S21
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 OnePlus 13 and Galaxy S21 the same size?
OnePlus 13 measures 162.9×76.5×8.5mm while Galaxy S21 measures 151.7×71.2×7.9mm. They are different sizes.
Can I use a OnePlus 13 screen protector on Galaxy S21?
Screen sizes differ (6.82" vs 6.2") — protector won't fit.
What's different between OnePlus 13 and Galaxy S21 dimensions?
The height differs by 11.2mm, the width by 5.3mm, and thickness by 0.6mm. The camera module layout is also different.
Do I need a new case for Galaxy S21?
Yes, you'll need a new case. The Galaxy S21 has different dimensions than the OnePlus 13, so cases are not interchangeable.
Will OnePlus 13 accessories work with Galaxy S21?
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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