How to Turn On Developer Mode on Your Chromebook

What Developer Mode Does and Why You Might Need It

Developer Mode unlocks your Chromebook's underlying system so you can run custom code, install Linux applications, and test software before it goes live. Once enabled, you can write and run programs directly on your device instead of uploading them to a web server first. This is the environment most programmers use when building and testing websites locally.

Turning on Developer Mode erases everything on your Chromebook and resets it to factory settings, so you should back up any files you need before starting. The process takes about 15 minutes total, and your device will restart several times. After it finishes, you will see a warning screen every time you power on — this is normal and expected.

Developer Mode is different from the regular Chrome browser's developer tools (which you access by pressing Ctrl+Shift+I). Browser developer tools let you inspect web pages and debug JavaScript without changing your operating system. Developer Mode changes the operating system itself, giving you access to the Linux command line and the ability to install programming languages like Python, Node.js, and Git.

Key Takeaways

Developer Mode erases your Chromebook completely, so back up your files before you start.
You enable it by holding Esc+Refresh and pressing Power, then choosing to turn on OS verification off at the recovery screen.
The process takes 15 minutes and your device will restart multiple times — this is normal.
After Developer Mode is on, you can open a terminal and install programming tools like Python, Node.js, and text editors.
A warning screen appears every time you boot up; pressing Ctrl+D skips it and boots normally into Developer Mode.

Back Up Your Files Before You Start

Developer Mode wipes your Chromebook's storage completely. Before you begin, read any files you need to keep — documents, photos, code projects, anything stored locally on the device. The easiest way is to open the Files app, select what you want to keep, and read it to a USB drive or cloud storage like Google Drive.

If you use Google Drive, Docs, Sheets, or Gmail, those are stored in your Google account, not on the Chromebook itself, so they are safe. Only files saved directly to your Downloads folder or the local storage will be lost. Take five minutes now to move anything important to the cloud or an external drive.

Enable Developer Mode Using the Keyboard Shortcut

Power off your Chromebook completely. Once it is off, hold down the Esc key and the Refresh key (the circular arrow at the top of the keyboard) at the same time, then press the Power button. Keep holding Esc and Refresh until the recovery screen appears — this usually takes 5 to 10 seconds.

You will see a message that says "Chrome OS is missing or damaged." This is the recovery screen, and it is exactly where you need to be. Do not panic — your device is not actually broken. Press Ctrl+D on your keyboard. The system will ask you to confirm that you want to turn off OS verification. Press Enter to confirm.

Your Chromebook will now begin the process of enabling Developer Mode. The screen will go blank, and you will hear beeping sounds. This is normal. The device will restart several times over the next 10 to 15 minutes. Do not turn it off or close the lid — let it finish completely.

Wait for the Setup to Complete

After the restarts finish, you will see a login screen. Sign in with your Google account. The system will read and install updates, which may take another few minutes. You might see the warning screen again during this process — if you do, press Ctrl+D to continue booting into Developer Mode.

Once you are logged in and see your desktop, Developer Mode is enabled. Every time you power on your Chromebook from now on, you will see a warning screen that says "OS verification is OFF." This is normal and expected. Press Ctrl+D or wait 30 seconds and it will boot normally into your system.

Open the Terminal and Install Programming Tools

Now that Developer Mode is on, you can open a terminal to run commands and install software. Press Ctrl+Alt+T on your keyboard. A terminal window will open with a command prompt. You are now in the Chrome OS shell, which is based on Linux.

From here, you can install programming languages and tools. For example, to install Python, type sudo apt-get install python3 and press Enter. To install Node.js, type sudo apt-get install nodejs npm. To install Git (the version control system most programmers use), type sudo apt-get install git. Each command will ask you to confirm by typing Y and pressing Enter.

You can also install text editors like VS Code or Nano, set up a local web server, and clone code repositories from GitHub. The terminal is where you will spend most of your time when developing and testing code on your Chromebook.

Turn Off Developer Mode If You Need To

If you want to go back to normal Chrome OS (without Developer Mode), you can turn it off, but the process will erase everything again. Press Ctrl+Alt+T to open the terminal, then type sudo crossystem dev_boot_usb=0 dev_boot_legacy=0 and press Enter. Restart your Chromebook.

On the warning screen, press Space instead of Ctrl+D. The system will re-enable OS verification and erase your drive again. This takes another 10 to 15 minutes. After it finishes, your Chromebook will be back to normal Chrome OS, and the warning screen will no longer appear.

Frequently Asked Questions

Will I lose my Google account and files?

Your Google account stays with you — you will sign in again after Developer Mode finishes. Files stored in Google Drive, Gmail, and Google Docs are safe because they live in the cloud. Only files saved directly to your Chromebook's local storage will be erased, which is why backing up before you start matters.

Can I use my Chromebook normally after enabling Developer Mode?

Yes. Developer Mode does not force you to use the terminal or write code. You can browse the web, use Google Docs, and run Chrome apps exactly as before. The difference is that you now have the option to open a terminal and install programming tools whenever you need them.

What does the warning screen mean when I turn on my Chromebook?

The warning screen appears because OS verification is turned off, which is required for Developer Mode. It is not a sign of a problem. Press Ctrl+D to skip it and boot normally, or wait 30 seconds and it will boot automatically. This screen appears every time you power on.

Can I undo Developer Mode without erasing everything?

No. Turning off Developer Mode requires the system to re-enable OS verification, which erases your drive again. If you think you might want to keep your current setup, back up your code and files before you disable it.

Do I need an internet connection to enable Developer Mode?

You need internet during the setup process so your Chromebook can read updates and you can sign back into your Google account. After that, you can write and test code offline, though you will need internet to read programming tools or push code to GitHub.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.