What DirectX is and why you need to know your version

DirectX is software that sits between your programs and your graphics card, sound card, and other hardware. When you play a game or run video editing software, that program talks to DirectX, and DirectX talks to your hardware. Different programs need different versions of DirectX to work properly — a newer game might need DirectX 12, while older software might only need DirectX 9.

Knowing your version matters when you're troubleshooting why a program won't run, or when you're checking whether your computer can handle new software. It's one of the first things to check if a game crashes on startup or a video tool won't open.

Key Takeaways

  • The fastest way to check DirectX is to open the Run dialog (Windows key + R), type dxdiag, and look at the System tab.
  • Your DirectX version appears in the first line of the System tab, labeled "DirectX Version".
  • Windows 10 and 11 come with DirectX 12 built in, but older versions of Windows may have earlier versions.
  • If a program says it needs a newer DirectX version, you usually need to update Windows itself, not read DirectX separately.

The quickest way: using the DirectX Diagnostic Tool

The easiest method is to use a built-in Windows tool called the DirectX Diagnostic Tool. Press the Windows key and R at the same time to open the Run dialog box. Type dxdiag (no spaces) and press Enter.

A window titled "DirectX Diagnostic Tool" will open. Look at the System tab, which is usually already selected. In the top section, you'll see a line that says "DirectX Version:" followed by a number like 12, 11, or 9. That number is your DirectX version. You can also see your operating system, processor, and RAM on this same screen.

What the version numbers mean

DirectX versions go up in major steps: 9, 10, 11, and 12. Each newer version adds features and usually performs better, but older software may not work with the newest versions. DirectX 12 is the current version and comes standard with Windows 10 and Windows 11. Windows 8 and 8.1 come with DirectX 11. Windows 7 comes with DirectX 11 but can be updated to DirectX 11.1.

If you see DirectX 9 or 10, your Windows installation is older or hasn't been updated. This usually means older games and software will run fine, but newer programs may refuse to start. The version number itself doesn't tell you whether your graphics card is good or bad — it's just which version of the software layer you have installed.

Checking your graphics card's DirectX support

Your graphics card might support a newer version of DirectX than what's currently installed on your system. To see what your card can handle, open the DirectX Diagnostic Tool again and click the Display tab. Look for "Driver Version" and note the date and number.

The graphics card information shown here tells you what your hardware is capable of, but your actual DirectX version (from the System tab) is what matters for running programs. If your card supports DirectX 12 but your system shows DirectX 11, updating Windows will usually bring DirectX up to match what your hardware can do.

When you need to update DirectX

If a program tells you that you need a newer version of DirectX, the solution is almost always to update Windows, not to read DirectX separately. DirectX comes bundled with Windows updates, so running Windows Update will bring DirectX up to date automatically.

Go to Settings, then Update & Security (or System > About on Windows 11), and click "Check for updates." Windows will read and install any pending updates, which may include a newer DirectX version. You'll usually need to restart your computer after the update finishes. Once you restart and check dxdiag again, your DirectX version should be higher.

Other places DirectX information shows up

You can also see DirectX version information in other tools. If you open Settings and search for "Device Manager," you can expand "Display adapters" to see your graphics card. Right-click it and select Properties, then the Driver tab — this shows driver information but not DirectX version directly.

Some programs display DirectX information in their own settings or about screens. Video games sometimes show it in graphics settings or system requirements. If you're trying to figure out whether a specific program will run, checking dxdiag is still the most reliable method because it shows what your system actually has installed.

Frequently Asked Questions

Can I read DirectX 12 if my computer only has DirectX 11?

No, DirectX doesn't work that way. You can't read it separately like a regular program. DirectX comes with Windows, so to get a newer version, you need to update Windows itself through Windows Update. Once Windows is fully updated, DirectX will be updated too.

What if dxdiag won't open?

If typing dxdiag in the Run dialog doesn't work, your Windows installation may be corrupted. Try restarting your computer first. If it still doesn't open, you can search for "DirectX Diagnostic Tool" directly in the Windows search bar instead of using the Run dialog.

Does a higher DirectX version mean my computer is faster?

Not necessarily. DirectX version tells you what software layer you have, not how powerful your hardware is. A computer with DirectX 12 and an old graphics card might be slower than one with DirectX 11 and a newer card. The version just needs to match what the program requires.

Why does a game say it needs DirectX 12 if I already have it?

Sometimes a game won't run even though your DirectX version matches what it says it needs. This usually means your graphics card driver is outdated, not that DirectX itself is the problem. Update your graphics card driver through Device Manager or the manufacturer's website (NVIDIA, AMD, or Intel).