UUID V4

128 bits, 16 bytes

122 bits of entropy, 5.31691198 × 10³⁶ possible IDs

“...the odds of collision between any two is 1 in 2.71 x 10¹⁸ Put another way, one would need to generate 1 billion v4 UUIDs per second for 85 years to have a 50% chance of a single collision.”

8d18cc7e-d6c5-4cf1-bef6-f29bafe3eba0
e06e2f41-505c-481a-b685-de06f8f1ad68
415821f0-487d-41f9-82d4-89412e7399a2
47f300a9-8dc6-4e0f-965b-a4a5e15e9631
34c7dbc5-492d-45d4-9e1e-1486622610f4
48183fb4-3f5b-4d2b-ac8a-ab26e72f6b22
7aba9d86-cc19-4030-ae20-5de6b88c33d6
bdcd4bee-1b41-4f14-a44d-95aa4ca86841
96c2b494-d916-4673-ac05-43245eb55e8f
e2fddbfa-341b-415e-8020-8f76e9c885b4
    

OLC IDs

12 characters, 12 bytes

51.863 bits of entropy, 4.096 × 10¹⁵ possible IDs

Open Location Code (OLC) alphabet Ids. OLC is a geocoding system that encodes latitude and longitude into a short string of characters. The alphabet is simplified to use only uppercase letters and digits, excluding characters that can be easily confused (like '0' and 'O', '1' and 'I').

Q33H-7G56-MH4V
JHQF-9MW9-MXWH
JRWP-MM2F-M96G
H6VV-6MQQ-65V5
CP7F-FPQQ-G5V2
XWHX-42C3-M6QW
QX42-H7R4-3GR2
G8CQ-3JGP-GFV7
46J8-M9M2-4HR4
6GW5-QPP2-RCX7
    

Double UUID V4

256 bits, 32 bytes

244 bits of entropy, 2.8269553 × 10⁷³ possible IDs

4670fa9c-21cf-4cbc-84c6-913f5cb15255-52c4fe1d-5fd9-43a0-9c4e-38cd4a06a9ee
443d74f7-9f4b-4d0b-88f7-d2a580c8e0b4-2e93b039-0a1a-45c7-a924-f4d8cc0d1847
767bb994-de3f-4aa4-b921-5e12d29d5801-ceec0865-f3d8-4dc6-adbb-56841e972523
6bf718e8-203f-42f4-9c92-f12e0871fb2a-3b857eba-2b15-4066-8be9-7779405748af
aecc2937-c1bc-4bc6-ac31-58a63774fb73-345912ea-b98c-4b32-a03f-96a7573f2bf1
c22a7aaf-fa7d-4430-87cf-24701cd6e69c-a15fcc02-9d8c-489c-b7db-eb1dc74ef046
e7fcc44a-dfeb-4fdc-8b0f-93923d85c414-8acf582b-6f2d-48d7-870f-748607bec194
45bef1f8-f1cf-403a-af67-dd90f743cc92-abb6feb8-5288-4781-aa00-6ee360095dc8
3de36d93-95f5-4720-91c6-35d0fe52dbe1-ad4816ed-e540-461f-9a48-2cb56232ed6f
450787b8-cfbf-4c59-8511-c17cb629d5ea-a33637a9-f217-495c-bbdd-96ee61295be9
    

UUID V7

Unix ms timestamp (48-bit), random bits (74-bit total). Sortable by time.

Excellent DB performance (sequential inserts); sortable; no MAC leakage. Database primary keys; distributed systems. Recommended for most modern apps/DBs.

01a1054b-c58f-729b-90da-807f4dc3b367
01a1054b-c590-754e-ae37-51aae9a3ff40
01a1054b-c590-754e-ae37-58bd8023c8a3
01a1054b-c590-754e-ae37-6384fec45a5c
01a1054b-c590-754e-ae37-682e69a4845a
01a1054b-c590-754e-ae37-719d8d98a68a
01a1054b-c590-754e-ae37-7b51f7252564
01a1054b-c590-754e-ae37-83f73813b79a
01a1054b-c591-719a-831a-37166ed3f5fa
01a1054b-c591-719a-831a-3ded31ac84e3
    

Names (Short)

Randomly generated people names.

Lilyan Nora
Mara Batsheva
Modestia Augustina
Annabal Sisely
Hildegaard Livia
Lula Shannon
Gabie Yolane
Fiann Sherri
Hollyanne Halli
Lillian Storm
    

Names (Long)

Randomly generated people names.

Coreen Rosette Sheela
Latisha Rhiamon Phaidra
Antoinette Pauli Zorana
Margarete Carlynne Ardelle
Kaylee Joye Ofelia
Danika Kalina Jasmina
Elwira Bridget Desiree
Nadine Dory Alaine
Maude Sibelle Sherill
Mandy Lavena Angelita
    

Countries

Randomly generated country names.

Tuvalu
Guyana
Denmark
Haiti
United States
Dominica
Madagascar
Syria
Argentina
Cocos Islands
    

Passwords

Randomly generated secure passwords.

gGu=D}UxIz&TMV%G?efh
MoppuKb)qOrY^.e{TR&}
+XsSSE5)[nCQI,c0:P%t
4S**}|3lY*LL?&$sDopo
PkiB;#AIi@ytslCXtvoo
$K6KQIH-?5hv8Li-F!42
?b+sxB>Vxe_f3x}^zrxl
Wmi+bX^MEyFc7iE9<2L<
[I6T^p*TcqVdF%&uF@^t
O>qRP8yaWbJCcH-]myEM
    

Process Folder Names

Sequentially generated process, human-readable, folder names.

20261004-050334-5GC7RM
20261004-050334-V43CHH
20261004-050334-RWH2J5
20261004-050334-RVPPJ7
20261004-050334-3C27Q8
20261004-050334-F2FXHP
20261004-050334-FFHJWH
20261004-050334-H96MGP
20261004-050334-8435J6
20261004-050334-VF4FJ8
    

Google-like IDs

Randomly generated Google-like 'sub' IDs.

558571945844674098477
949216202161921593106
479372984419202618926
260427719017670176162
877073129645616174290
874061591748293004923
083958471715186526302
349920356959320027737
635087918593260409871
139134012951660704541
    

Unix Timestamps

Randomly generated Unix timestamps from the past 2 months.

1787791970
1787402693
1786827176
1788718532
1789211228
1787739464
1788537652
1790846323
1786078521
1789267900
    

GUIDs

Randomly generated GUIDs using the Base64 alphabet.

DUmCM0gpuzc-
VmcBXD6hhtAm
RrxOtMnXe3Gm
O4XVKG_s_GaK
aFq3mVfROai7
CjF6cWj726o3
ENKefAIXlD9T
TDXiC5pB-09y
CkTfnPItG9kE
8CN3-PbxC5yu
    

Randomly generated OLC IDs.

Secure 128-bit random IDs, using the Open Location Code (OLC) alphabet. The alphabet is simplified to use only uppercase letters and digits, excluding characters that can be easily confused (like '0' and 'O', '1' and 'I').

GCQ388WJX8HVVPMWQJCXFW4HRVQ8GV
33GMFJ4RCG8Q669443442W6C8F7RJP
HCRV9F2GX58FHJVF4J344GPVPF2QJR
99V7WQ4QFWRH4WMHGCPW2RV56XGXHP
MX6JQMH8M986MGM79C6R459HWHVRH9
2FPXG5CXR7757QPM76XHRMR9G2WQ29
XVJ88H49G2268P7CXMRGVM5MJ9V9WW
HW84P2G9WXC62898M5XJ5XMH4J394W
3MFCQXRQ8R3F4GWCR6395PQQRFFGG6
FF3PXH4M2Q8QPWGMJC2C4665CHXXPR
    

Encrypted URL IDs (GUID)

Base64URL encoded encrypted V7 UUID tokens. Each token packs an 8-byte random IV plus a UUIDv7 XOR-masked with an HMAC-SHA256 keystream derived from the IV and a private key, so the token is opaque and non-sequential in URLs but still reversible to recover the original UUIDv7 (and its embedded timestamp) server-side.

ia4q-ZqrneKZEbVH0jRmoXMw-NDkNeUo
wyT7tldqy2xz__-DzdwlpeoVPMxdK8Gw
5YQu5Y6dKJlUMBywrYHRfJe0dtRz52HY
vvBgy790X4M18g2dILSGBrRScLDi1dd_
fPosQyMFOu-VCwZNQ_BWtlr7eknHiLCV
zlaUVnradz-VjS-NLjtPcTF-25fEi5bY
LOdbam4JpxN74T-yLoGcgh29ixFKREJD
XS1E62efp3S5ioU5FNCBYLUQMRx3O5lL
yZGFn5I8cI0Ys-Dqu5q-ZqsBuzPiZ84q
ZdOzMH8xmdvCBkaRi2gwYk7PLqVd7xnN