Because it is the only part of a Webflow launch that happens somewhere else. Everything else lives in Webflow. The domain lives with your registrar, and the two systems have to agree with each other. Most launch day panic is a DNS record typed into the wrong box.
The good news is that the process is short. Once you understand what each piece does, it takes about ten minutes of actual work.
The rest is waiting, and knowing what normal waiting looks like is most of what stops people panicking.
Three things. You need a domain you control, you need login access to wherever that domain's DNS is managed, and you need a paid Webflow Site plan. Webflow's pricing page states plainly that a paid Site plan is required to publish to a custom domain, so the free Starter plan will not do it.
The DNS access is the one people get stuck on. The company you bought the domain from is not always the company managing its DNS, especially if a previous developer pointed it at Cloudflare or another provider years ago.
Find that out first. Trying to change records at the registrar when DNS is actually served elsewhere is the single most common wasted hour in a launch.
If you are not sure which Webflow plan you need for the rest of the site, we broke the tiers down in our guide to Webflow's plan limits.
The order matters. Add the Site plan first, then add both versions of your domain in your Webflow site settings, then copy the DNS records Webflow shows you into your DNS provider, then set your default domain, then publish. Doing these out of order is what produces the confusing error states.
Add both the root domain and the www version. Webflow expects to know about both, because whichever one you do not use as your default gets redirected to the one you do.
Then copy the exact DNS values Webflow displays in your own site settings. This is important enough to say bluntly: do not copy DNS values from any article, including this one. Take them from the screen in your own project, because they are the current correct values for your site and a number from a blog post may be years out of date.
Once the records are saved at your DNS provider, come back to Webflow and use the check button. It will tell you which records are correct and which are still wrong or missing, which is far more useful than guessing.
Pick one and commit. Technically www is slightly easier because it uses a CNAME record, which follows changes at Webflow's end automatically. The root domain needs address records that point at fixed values. Either works, and the difference matters far less than being consistent.
What actually matters is that only one of them is the default. Whichever you choose becomes your canonical address, and the other redirects to it. Having both resolve independently is the mistake, because then search engines see two copies of your site.
Our default recommendation is to match whatever your existing links already use. If your business cards, your Google Business Profile, and five years of backlinks all say the root domain, use the root domain.
Do not change this later without a reason. Switching the default after launch means every existing link takes an extra redirect hop.
Usually minutes, sometimes hours. DNS changes spread through the internet at a pace set by the TTL value on your old records, and different networks pick up the change at different times. It is completely normal for the new site to appear for you and not for a colleague on another connection.
The trick is to lower your TTL a day or two before the switch if you can. A short TTL means the old answer expires quickly and the new one takes over sooner.
While you wait, resist the urge to keep changing records. Every edit restarts the clock, and most launch day disasters we have seen were caused by someone fixing something that was already working.
Check with an independent DNS lookup rather than your own browser. Browsers cache aggressively, and yours will happily show you yesterday's answer long after the change is live.
Webflow handles it. Its pricing page describes free SSL as one of the things that comes with Webflow hosting, so you do not need to buy or install a certificate yourself. It provisions automatically once your DNS is pointing correctly.
The certificate cannot be issued until the domain actually resolves to Webflow, so a site that looks insecure immediately after switching is usually just early rather than broken. Give it time before you start troubleshooting.
On the higher tiers there is more control available. Webflow lists HSTS, which enforces HTTPS connections to protect visitors from downgrade attacks, and custom SSL certificates as features of its Team and Enterprise plans.
For a normal business site, none of that is needed. The default free certificate is the right answer and requires no decisions from you.
Four keep recurring. Editing DNS at the wrong provider, adding only one version of the domain, forgetting to set the default domain, and forgetting to publish after everything is connected. That last one is more common than you would believe.
The publish step catches people because the domain settings look complete and green. Webflow will happily show a correctly configured domain that has never had the site pushed to it.
Another quiet one is a proxy setting at your DNS provider. If your DNS is on Cloudflare and the record is set to proxy traffic rather than just resolve it, you can end up with certificate errors that look like a Webflow problem and are not.
The last is scheduling. Do not launch a domain change at 5pm on a Friday. If something needs a support ticket, you want it to be Tuesday morning.
Keep it, and redirect it. If you are moving from an old site on a different domain, every old URL needs to point at its equivalent on the new one. Letting an old domain expire throws away every backlink pointing at it, which is usually the most valuable thing the old site had.
The redirects have to be set up at the old host, not in Webflow, because Webflow only controls traffic that already reached it. This surprises people who expect to manage everything in one place.
Map the URLs page by page rather than sending everything to the homepage. A blanket redirect to the root throws away the specific relevance each page had earned. We covered how to do this properly in our guide to setting up redirects without losing traffic.
If you are handing the finished site to a client afterwards, decide who owns the domain account before launch rather than after. A domain sitting in a former contractor's personal account is a problem that surfaces at the worst possible moment.
Connecting a domain for the first time does not, but changing an existing one does. A brand new site on a new domain starts from nothing either way. Moving a live site from one domain to another moves everything you have earned, and that needs redirects and a Search Console update.
One thing worth checking on launch day is that the site is actually reachable and served over HTTPS on your chosen default. Webflow's hosting uses a global CDN, described on its own pricing page as routing each visitor to the nearest server, and its hosting FAQ names Amazon's CloudFront CDN and Fastly.
After the domain is live, the rest of the technical work begins. Our technical SEO checklist for Webflow websites covers what to check once the domain itself is settled.
Do not judge rankings in the first week. Search engines need time to recrawl, and early movement tells you almost nothing.
Before launch day, confirm three things. Find out which provider actually serves your DNS, check that your Webflow Site plan is active and paid, and make sure you personally have login access to change the records. Those three checks remove nearly every launch day surprise we have ever been called about.
Then work in order. Add both domain versions, copy the records from your own Webflow settings, set the default, publish, and wait without touching anything.
If you would rather have someone handle the switch with you on a call, we are happy to do that. Reach us at phoenix.studio and we will make sure the launch is boring, which is exactly what you want it to be.
Tell us where you want to go. We'll tell you how we'd get you there.