Your domain name is the one piece of your brand that appears everywhere — on business cards, in email addresses, in every link you ever share. Getting it right matters. Getting it wrong is expensive to fix.
Here is a practical guide to making the decision well.
Start with .com if you can
The argument for alternative extensions — .io, .co, .app, .dev — is real. Plenty of successful companies use them. But .com is still what people type by default when they hear a name spoken out loud. If you pick acme.io and someone else owns acme.com, you will spend years losing a percentage of your traffic and word-of-mouth referrals to that other site.
If the .com for your preferred name is taken, your options are: modify the name until you find a .com that's free, buy the .com from whoever owns it, or make peace with a different extension and accept the trade-off. There is no fourth option. A business name generator that checks domain availability in real time makes this iteration much faster.
Keep it short and typeable
The sweet spot is two syllables or fewer and no more than ten characters. Every extra character is another opportunity for a typo, and every unusual letter combination is a reason for someone to give up and search for you on Google instead.
Avoid hyphens. They are invisible in speech, easy to forget, and signal "I couldn't get the real domain" to anyone who notices. Avoid numbers unless they are part of your brand name itself — people are never sure whether to spell them out or use the digit.
Make sure it passes the phone test
Imagine reading your domain out loud to someone on a phone call. Can they write it down correctly without asking you to spell it? If you have to say "that's X as in Xylophone, then a hyphen, then..." you have already lost.
Say it out loud before you register it. Then say it to someone else and ask them to type it. The results will surprise you.
Check for unintended meanings
Before registering, look at your domain as one continuous string, not as separate words. The classic examples are embarrassing enough that they've become cautionary tales taught in every marketing course. What you intend to read as "speed of art" might read as something else entirely.
Also check for meanings in other languages if you have any international ambitions. A name that is neutral in English can be offensive or absurd in Spanish, French, or German.
Check social handle availability at the same time
You want your domain name and your social handles to match, or at least be close enough that people can find you. Check Instagram, LinkedIn, X, and TikTok before you commit. Securing handles after the fact is possible but often frustrating.
Register it immediately once you decide
Domain availability can disappear quickly, especially for common words. Some registrars and domain brokers use automated tools to detect search activity and register attractive domains before you come back to buy them. Once you have a name you are confident in, register it the same day.
Register for at least two years. A domain that expires because you forgot to renew is a painful and avoidable problem.
You do not need to register every extension
You will see advice suggesting you register .com, .net, .org, and ten country-code extensions defensively. For most small businesses and startups, this is not worth the cost or the effort. Register your primary .com, and possibly your country's local extension if you are serving a national market. That's usually enough.