Samsung Galaxy S21 vs Samsung Galaxy S25 Ultra Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

8.5	8.0
Samsung Galaxy S21	Samsung Galaxy S25 Ultra
Released · Jan 29, 2021	Released · Feb 07, 2025
6.2-inch · 2400 x 1080 px	6.9-inch · 3120 x 1440 px
12 MP Main · 10 MP Selfie	200 MP Main · 12 MP Selfie
8GB · 128GB	12GB · 256GB
4000 mAh	5000 mAh
Check prices	Check prices

Display

Size
6.2-inch	6.9-inch
Resolution
2400 x 1080 px, 20:9 ratio, 424 PPI	3120 x 1440 px, 19.5:9 ratio, 498 PPI
Technology
Dynamic AMOLED	Dynamic AMOLED
Refresh rate
120Hz (adaptive)	120Hz
Screen-to-body
86.06 %	90.30 %
Peak brightness
1300 cd/m2 (nit)	2600 cd/m2 (nit)
Features
HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Armor 2), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 888 (5 nm)	Qualcomm Snapdragon 8 Elite for Galaxy SM8750-AB (3 nm)
Processor
Octa-core, 1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680, 64-bit	Octa-core, 2x 4.47GHz Oryon V2 Phoenix L + 6x 3.53GHz Oryon V2 Phoenix M, 64-bit
GPU
Adreno 660	Adreno 830
RAM
8GB (LPDDR5)	12GB (LPDDR5X)
Internal storage
128GB (UFS 3.0), not expandable	256GB (UFS 4.0), not expandable
OS
Android (13, 12, 11), Samsung One UI	Android (15), One UI
Device type
Smartphone	Smartphone

Battery

Capacity
4000 mAh	5000 mAh
Type
Li - Polymer, Not user replaceable	Li - Ion, Not user replaceable
Charging
Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging	Fast charging, Qi wireless charging, Reverse wireless charging
Max charge speed
Wired: 25.0W Wireless: 15.0W	Wired: 45.0W Wireless: 15.0W

Battery Life Estimate

4h 28min

Browsing

7h 47min

Video

7h 36min

Gaming

7h 9min

Battery Life Estimate

8h 0min

Browsing

20h 49min

Video

8h 54min

Gaming

14h 21min

Camera

Rear
Triple camera	Quad camera
Main camera
12 MP (OIS, PDAF) Specifications: Aperture size: F1.8 Focal length: 26 mm Sensor size: 1/1.76" Pixel size: 1.8 μm	200 MP (OIS, Laser and PDAF) Specifications: Aperture size: F1.7 Focal length: 24 mm Sensor size: 1/1.3" Pixel size: 0.6 μm
Second camera
64 MP (Telephoto, OIS, PDAF) Specifications: Aperture size: F2.0 Focal Length: 29 mm Sensor size: 1/1.7" Pixel size: 0.8 μm	50 MP (Telephoto, Periscope, OIS, PDAF) Specifications: Optical zoom: 5.0x Aperture size: F3.4 Focal Length: 111 mm Sensor size: 1/2.52" Pixel size: 0.7 μm
Third camera
12 MP (Ultra-wide, Autofocus) Specifications: Aperture size: F2.2 Focal Length: 13 mm Sensor size: 1/2.55" Pixel size: 1.4 μm	10 MP (Telephoto, OIS, PDAF) Specifications: Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 67 mm Sensor size: 1/3.52" Pixel size: 1.12 μm
Fourth camera
	50 MP (Ultra-wide, PDAF) Specifications: Aperture size: F1.9 Pixel size: 0.7 μm
Flash
LED	LED
Video recording
7680x4320 (8K UHD) (24 fps), 3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps) Features: OIS, HDR, Hyperlapse, Continuous autofocus, Video light, EIS	7680x4320 (8K UHD) (30 fps), 3840x2160 (4K UHD) (120 fps), 1920x1080 (Full HD) (240 fps) Features: HDR, Continuous autofocus, Picture-taking during video recording
Front
10 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)	12 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)

N/A

Overall

N/A

Photo

N/A

Video

158

Overall

165

Photo

150

Video

Design

Dimensions
5.97 x 2.80 x 0.31 inches (151.7 x 71.2 x 7.9 mm)	6.41 x 3.06 x 0.32 inches (162.8 x 77.6 x 8.2 mm) thickness with camera 0.36 inches (9.1 mm)
Weight
6.03 oz(171.0 g)	7.69 oz(218.0 g)
Materials
Back: Plastic Frame: Aluminum	Back: Glass (Corning Gorilla Glass Armor 2) Frame: Titanium
Resistance
Water, Dust; IP68	Water, Dust; IP68
Biometrics
2D Face unlock, Ultrasonic in-screen fingerprint	Ultrasonic in-screen fingerprint
Features
	Stylus
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Phantom pink, Violet, Gray, White	Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray

Cellular

5G
Bands n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave	Bands n1, n2, n5, n7, n25, n28, n41, n66, n71, n77, n78, n257, n258, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 30(2300 WCS), 66(AWS-3), 71(600)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46, 48(3600)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 48(3600)
3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)	Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS	LTE-A Pro Cat 20 (2000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s
SIM type
Nano SIM	Nano SIM, eSIM

Multimedia

Headphones
No 3.5mm jack	No 3.5mm jack
Speakers
Earpiece, Multiple speakers	Earpiece, Multiple speakers
Features
32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus	aptX, aptX-HD
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM, Stereo, RDS
Additional microphone(s)
Noise cancellation, Video recording	Noise cancellation

Connectivity & Features

Bluetooth
5.0	5.4
Wi-Fi
802.11 a,b,g,n,ac,ax(Wi-Fi 6),dual-band MIMO, Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,ax(Wi-Fi 6),Wi-Fi 7,Wi-Fi 6E Wi-Fi Direct, Hotspot
USB
Type-C (reversible), USB 3.2, Features: Charging, Headphones port, OTG, Video out	Type-C (reversible), USB 3.2, Features: Charging, OTG
Hearing aid compatible
M3/T3	M3/T4
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer	Accelerometer, Gyroscope, Compass, Barometer
Other
NFC, ANT+	NFC, Ultra Wideband (UWB)

Regulatory Approval

FCC approval
Date approved: Dec 08, 2020 FCC ID value: A3LSMG991U	Date approved: Nov 26, 2024 FCC ID value: A3LSMS938U
Measured SAR
Head: 0.36 W/kg Body: 1.08 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.09 W/kg Phablet: 2.49 W/kg	Head: 1.26 W/kg Body: 0.64 W/kg Simultaneous Transmission: 1.19 W/kg

Buyers information

MSRP
$ 800	$ 1299 / € 1449
In The Box
C to C Data Cable, Ejection Pin	USB-C cable, SIM ejector tool, Paperwork

Availability

Officially announced
Jan 14, 2021	Jan 22, 2025

Alternative variants

with 256GB storage


Internal storage	256GB

With 512GB internal storage


Internal storage	512GB
MSRP	$ 1420

for Europe


System chip	Samsung Exynos 2100 (5 nm)
Processor	Octa-core, 2900 MHz, 1x 2.91GHz Cortex-X1 + 3x 2.81GHz Cortex-A78 + 4x 2.2GHz Cortex-A55, 64-bit
GPU	Mali G78 MP14
Weight	5.96 oz(169.0 g)
5G	Bands SA, NSA, Sub-6
FCC approval	Date approved: Dec 18, 2020 FCC ID value: A3LSMG991B
Measured SAR	Head: 0.42 W/kg Body: 0.94 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.34 W/kg Phablet: 2.37 W/kg

With 1TB internal storage


Internal storage	1024GB
MSRP	$ 1660

International


5G	Bands n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n38, n40, n41, n66, n75, n77, n78, SA, NSA, Sub-6
4G (FDD)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 32(1500 L-band), 66(AWS-3)
4G (TDD)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
SIM type	Dual Nano SIM + eSIM

Links

Full specifications
Samsung Galaxy S21 Specs	Samsung Galaxy S25 Ultra Specs
PhoneArena Review
Samsung Galaxy S21 Review	Samsung Galaxy S25 Ultra Review
User Reviews
Samsung Galaxy S21 User Reviews