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Galaxy S21 vs Galaxy Z Fold 3: Size & Dimensions Compared

The Galaxy Z Fold 3 is the larger phone, measuring 6.5mm shorter and 4.1mm wider.

Visual Size Overlay

Galaxy S21Galaxy Z Fold 3
151.7mm158.2mm-6.5mm71.2mm67.1mm+4.1mm10mm
Height Δ
-6.5mm
Width Δ
+4.1mm
Thickness Δ
-8.1mm
Case CompatibilityWon't Fit
  • 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
Screen ProtectorNot Compatible

Screen sizes differ (6.2" vs 7.6") — protector won't fit.

DimensionGalaxy S21Galaxy Z Fold 3Difference
Height151.7mm158.2mmGalaxy Z Fold 3 +6.5mm (taller)
Width71.2mm67.1mmGalaxy Z Fold 3 -4.1mm (narrower)
Thickness7.9mm16mmGalaxy Z Fold 3 +8.1mm (thicker)
Weight169g271gGalaxy Z Fold 3 +102.0g (heavier)
Screen6.2"7.6"Galaxy Z Fold 3 +1.4" (larger)

Visual Size Comparison

HeightGalaxy Z Fold 3 +6.5mm
Galaxy S21
151.7mm
Galaxy Z Fold 3
158.2mm
WidthGalaxy S21 +4.1mm
Galaxy S21
71.2mm
Galaxy Z Fold 3
67.1mm
ThicknessGalaxy Z Fold 3 +8.1mm
Galaxy S21
7.9mm
Galaxy Z Fold 3
16mm

Button & Port Layout

Which is bigger?

The Galaxy Z Fold 3 is the taller phone at 158.2mm (vs 151.7mm). It is also 102g heavier.

Wireless Charging & MagSafe Compatibility

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

  • Both devices support wireless charging. Standard Qi/Qi2 chargers work with either phone.
SpecGalaxy S21Galaxy Z Fold 3
Wireless Charging15W15W
Qi VersionQiQi
MagSafeNoNo
Built-in MagnetsNoNo

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.

Upgrading from Galaxy S21 to Galaxy Z Fold 3?

Different sizes mean your old case probably won't fit. You'll need a new one.

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Frequently Asked Questions

Is Galaxy S21 bigger than Galaxy Z Fold 3?

No, the Galaxy Z Fold 3 is 6.5mm taller. The Galaxy S21 weighs 169g vs 271g.

Are Galaxy S21 and Galaxy Z Fold 3 the same size?

No, the height differs by 6.5mm, width by 4.1mm, and thickness by 8.1mm.