How to find your iPhone or iPad UDID (with or without a computer)

Your UDID (Unique Device Identifier) is the serial-like ID Apple uses to tie a signing certificate to one specific iPhone or iPad. Every certificate you buy is generated for a UDID, so you need it before checkout. Here are the three reliable ways to get it.

Method 1 — One tap on the phone (no computer)

1. Open lemoncert.com/checkout in Safari on the device itself (not Chrome — only Safari can install profiles).
2. Tap Get my UDID. A tiny configuration profile downloads.
3. Go to Settings → Profile Downloaded → Install. The profile only reads the UDID; it installs nothing else and you can delete it afterwards.
4. Safari reopens the checkout with your UDID already filled in. Done.

Method 2 — Finder or iTunes on a computer

1. Plug the device in with a cable and tap Trust on the phone.
2. Mac (macOS Catalina or later): open Finder, select the device in the sidebar, then click the text under the device name until it shows UDID.
3. Windows / older macOS: open iTunes, click the device icon, then click Serial Number until it toggles to UDID.
4. Right-click the UDID → Copy.

Method 3 — 3uTools or Apple Configurator

Tools like 3uTools (Windows) or Apple Configurator (Mac) display the UDID on their device overview page as soon as the phone is connected. Handy if you already use them for backups.

What a UDID looks like

• iPhone XS and newer: 25 characters, e.g. 00008030-001C2D3E4F5A6B7C (starts with 0000, one hyphen).
• Older devices: 40 hexadecimal characters, e.g. a1b2c3d4e5f6….

Once you have it, Get a certificate — the certificate is generated the moment your payment confirms.