# Your first check | ByteSweep Docs

> Run your first ByteSweep check on Mac, Windows or Linux. It reads your disk space, what can be cleaned and what opens at startup, and changes nothing.

Canonical: https://bytesweep.app/docs/learn/first-check.html
Last updated: 2026-11-02

## Your first check

The first check tells you how full your disk is and what can go. It changes nothing.

Show me on

### On this page

- Run the check
- Your free trial

### Run the check

On Mac

1. Open ByteSweep.
2. Read the three lines on the welcome screen.
3. Press **Check my Mac**.
4. Wait for the three steps: **How full your disk is**,**What can be cleaned safely**and**What opens at startup**. You land on Home.

This check asks for no permissions. ByteSweep asks for those later, only when a page needs one.

On Windows

1. Open ByteSweep.
2. Read the three lines under **Welcome to ByteSweep**.
3. Press **Check my PC**. You can stop it at any time.
4. When it finishes you land on Home.

ByteSweep runs as a normal user. Pages that need more offer **Run as administrator**.

On Linux

1. Open ByteSweep from your apps, or type `bytesweep` in a terminal.
2. Read the three lines on the welcome screen.
3. Press **Check my computer**.
4. When it finishes you land on Home.

ByteSweep runs as you. It asks for your password only to clean something that belongs to the system.

### Your free trial

You get 3 days to look at everything: every scan and every page. [Cleaning needs the one-time licence](https://bytesweep.app/docs/setup/licence.html), even during the trial. Undo is always free.

#### Now try it on your computer

Run the check, then find the size of what can be cleaned on Home.

##### If it doesn't work

If the check seems stuck on a very large disk, give it a few minutes. On a Mac, some folders stay closed until you [allow Full Disk Access](https://bytesweep.app/docs/setup/permissions.html), so the figure can be lower than the true one.

### Ask AI about ByteSweep

It reads these docs, then answers.

Opens in a new tab. Your question goes to them, not to us. AI can make mistakes, so check anything important against these docs.

Updated 2026-11-02. Something wrong here? Write to [support@bytesweep.app](mailto:support@bytesweep.app).