No, your Galaxy Z Fold 3 case won't fit the Galaxy S21
The Galaxy Z Fold 3 (158.2×67.1mm) and Galaxy S21 (151.7×71.2mm) differ too much for cases to be compatible.
Does a Galaxy Z Fold 3 Case Fit Galaxy S21?
Last verified: March 2026
No, a Galaxy Z Fold 3 case will not fit the Galaxy S21. The phones have different dimensions that make cases incompatible.
Your Galaxy Z Fold 3 case will NOT fit the Galaxy S21. Here's why:
- •Height differs by 6.5mm — case won't fit
- •Width differs by 4.1mm — case won't fit
- •8.1mm thicker — case won't close properly
- •Camera bump size differs significantly
- •Camera bump protrusion differs by 2.0mm — case lip may not protect camera
- •Different edge profiles (rounded vs flat) — case shell shape won't match
- •Corner shape differs — case won't seat properly
| Spec | Galaxy Z Fold 3 | Galaxy S21 | Diff |
|---|---|---|---|
| Height | 158.2mm | 151.7mm | Galaxy Z Fold 3 +6.5mm |
| Width | 67.1mm | 71.2mm | Galaxy S21 +4.1mm |
| Thickness | 16mm | 7.9mm | Galaxy Z Fold 3 +8.1mm |
| Camera Layout | vertical-triple | vertical-triple | Same |
| Port | usb-c | usb-c | Same |
Your Galaxy Z Fold 3 case won't fit the Galaxy S21. Find the right case:
As an Amazon Associate, WillItSnap earns from qualifying purchases. This doesn't affect our compatibility data.
Get alerts when we add more phones
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 Fold 3
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.
Related Guides
Related Compatibility Checks
Frequently Asked Questions
Are Galaxy Z Fold 3 and Galaxy S21 the same size?
Galaxy Z Fold 3 measures 158.2×67.1×16mm while Galaxy S21 measures 151.7×71.2×7.9mm. They are different sizes.
Can I use a Galaxy Z Fold 3 screen protector on Galaxy S21?
Screen sizes differ (7.6" vs 6.2") — protector won't fit.
What's different between Galaxy Z Fold 3 and Galaxy S21 dimensions?
The height differs by 6.5mm, the width by 4.1mm, and thickness by 8.1mm.
Do I need a new case for Galaxy S21?
Yes, you'll need a new case. The Galaxy S21 has different dimensions than the Galaxy Z Fold 3, so cases are not interchangeable.
Will Galaxy Z Fold 3 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.
Want to check another phone?
← Back to the compatibility checker