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.YAML file extension

To open .YAML files on Windows, right-click the .yaml file and choose Open with → a text editor (for example, Visual Studio Code).

To open a .yaml file, use a text editor (it’s plain text). For a better experience (syntax highlighting and validation), open it in Visual Studio Code with the “YAML” extension by Red Hat.

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Last updated: June 12, 2026

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .YAML files

Use these platform-specific instructions to open .YAML files safely.

Windows

  1. Right-click the .yaml file and choose Open with → a text editor (for example, Visual Studio Code).
  2. In Visual Studio Code, install the “YAML” extension (by Red Hat) from the marketplace for syntax highlighting and YAML-aware features.
Full Windows guide

Mac

  1. Control-click the .yaml file and choose Open With → a text editor (for example, Visual Studio Code).
  2. In Visual Studio Code, install the “YAML” extension (by Red Hat) to improve editing with YAML language support.
Full Mac guide

Linux

  1. Open the .yaml file in a text editor or code editor (for example, Visual Studio Code).
  2. In Visual Studio Code, add the “YAML” extension (by Red Hat) for YAML language features such as validation and navigation.
Full Linux guide

iOS

  1. .yaml is plain text; if you can’t edit it comfortably on iOS with your current apps, transfer it to a desktop editor (for example, Visual Studio Code) for YAML-aware editing.
Full iOS guide

Android

  1. .yaml is plain text; if your editor does not handle indentation well, transfer the file to a desktop editor (for example, Visual Studio Code) and use YAML language support there.
Full Android guide

Security notes

  • YAML files are plain text, but they can still be security-relevant: many systems use YAML for configuration, so changing values can alter behavior (for example, enabling features, changing endpoints, or modifying access settings) depending on the application that consumes the file.
  • Be cautious when processing untrusted YAML with software libraries: YAML can represent complex structures, and some YAML parsers support features that may have security implications if misused. Prefer safe parsing modes and follow your parser/library guidance when handling YAML from untrusted sources.
  • When receiving YAML over the web or in APIs, the standardized media type is application/yaml; handling it consistently reduces the risk of misclassification in pipelines that route or validate content based on type.

If you did not expect this file

This extension is usually plain data, text, or structured content—not a program by itself. The practical risk is social engineering (a scam attachment or misleading filename). For trusted senders you rarely need heavy-handed antivirus wording; use these tools when you want an extra check on unexpected downloads.

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Can't open this file?

These are the most common causes and fixes when .YAML files fail to open.

Common reasons

  • YAML parse errors caused by indentation
  • The file opens, but the application rejects it
  • Wrong file type association (opens in an unexpected program)

Fix steps

  1. Use spaces consistently for indentation and avoid tabs.
  2. Edit the file in an editor with YAML support (for example, VS Code with the Red Hat YAML extension) to catch structural issues earlier.

OS-specific troubleshooting

What is a .YAML file?

YAML is a human-readable data-serialization language used to represent structured data such as mappings (key/value pairs), sequences (lists), and scalars (strings/numbers). The recommended filename extension is .yaml. The registered media type for YAML is application/yaml.

Background

YAML (originally “YAML Ain’t Markup Language”) is designed to be readable and writable by humans while still representing structured data reliably. It is widely used for configuration files and for moving data between tools because it can express nested structures in a concise text form.

A .yaml file is plain text and is typically edited in code editors rather than opened in a specialized “viewer.” Many development tools can consume YAML, so the file’s meaning often depends on the application that uses it (for example, a tool’s configuration format).

From a standards perspective, YAML has an official specification (YAML 1.2.2). For Internet/media-type usage, YAML is registered as application/yaml (RFC 9512), which helps systems label YAML content correctly when transmitted or stored.

Common MIME types: application/yaml

Known aliases: .yml

Further reading

Authoritative resources for more details on the .YAML format.

Common .YAML issues

YAML parse errors caused by indentation

YAML structure is indentation-sensitive. A single wrong indent level (or mixing tabs and spaces) can change the structure or make the file invalid for the tool that reads it.

  1. Use spaces consistently for indentation and avoid tabs.
  2. Edit the file in an editor with YAML support (for example, VS Code with the Red Hat YAML extension) to catch structural issues earlier.

The file opens, but the application rejects it

Even if the YAML is syntactically valid, the consuming program may require a specific schema (required keys, value types, allowed fields). YAML is a general data format; the meaning is defined by the app using it.

  1. Check the application’s documentation for the expected YAML structure (required fields and types).
  2. Compare against a known-working example and adjust keys/values while keeping indentation and quoting consistent.

Wrong file type association (opens in an unexpected program)

Because .yaml is plain text, operating systems may associate it with an editor you don’t prefer, or with a tool that doesn’t provide YAML-friendly editing features.

  1. Change the default “Open with” program for .yaml to your preferred editor.
  2. For better editing, use an editor with YAML language support (for example, Visual Studio Code plus the Red Hat YAML extension).

FAQ

Is a .yaml file just text?

Yes. YAML is a human-readable data serialization format stored as plain text, typically edited with a text editor or code editor.

What’s the difference between .yaml and .yml?

They are both commonly used for YAML; the YAML documentation notes .yaml as the recommended filename extension.

What MIME type should YAML use?

RFC 9512 defines the registered media type application/yaml for YAML, and the IANA media types registry lists it accordingly.

How do I get better editing features for YAML in VS Code?

Install the “YAML” extension by Red Hat from the Visual Studio Marketplace to add YAML language support such as highlighting and validation features described by the extension.

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