---
title: What is a Base URL? (and why it matters)
description: A plain-language explainer of the Base URL setting in TSync — what it is, why TSync needs it, and how to set it correctly. No technical background needed.
product: TSync Intelligence 11.3.6
language: en
canonical: https://docs.tsync.pro/faq/what-is-base-url/
source: https://docs.tsync.pro/llms.txt
---

# What is a Base URL? 🌐

Your **Base URL** is simply **the web address where your TSync lives** — the same address you type into your browser to log in, for example `https://yourcompany.tsync.pro/`.

Think of it like the **street address of your office**. When you send out a letter, you write the office address on it so replies come back to the right place. TSync does the same thing: it needs to know its own address so that everything it sends out points back correctly.

## Why TSync needs it

TSync uses its address behind the scenes whenever it has to create a link that leaves the app and comes back later. For example:

- **Links inside emails** — an invoice you send to a customer, a password-reset email, a ticket notification. The "click here" button has to point to the right place.
- **Sending you to the right page** after you log in.
- **Loading the look of the app** — the styling, images and buttons you see on every screen.

If the address is wrong, those links point to the wrong place (or nowhere), so emails lead customers to a dead page and the app can look broken. Getting it right once means everything just works.

## What a correct address looks like

The address should be the **complete** one — the same full thing you see in your browser's address bar, including the `https://` at the front and a slash `/` at the end:

```
✅ https://erp.yourcompany.com/
✅ https://app.example.com/
```

A few easy-to-miss mistakes:

- leaving off the `https://` at the front
- forgetting the slash `/` at the very end
- using a temporary or test address instead of the real one customers actually visit

## Where it gets set

You normally enter the address **once, while TSync is first being installed**, in the box labelled *Base URL*. After that you don't need to touch it again — TSync remembers it.

## What if the address needs to change?

You'd only change it if your TSync **moves to a new web address** — for example you switch to a new domain name, or move from a plain `http://` address to a secure `https://` one.

This is a setup-level change, so it's best handled by whoever installed TSync for you (your IT person or your provider). Two friendly reminders:

- **Always make a backup first**, before any change like this.
- After the switch, everyone may need to **log in again** — that's normal.

If you're not sure, just [contact support](../support.md) and we'll walk you through it.

## See also

- [I get a "404" error after installing — how do I fix it?](../404-not-found-after-installation.md)
- [Set up the cron job](../setup-cron-job.md) — so reminders and automations run on time