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.DART file extension

To open .DART files on Windows, open the .dart file with a code editor (it is plain text).

To open a .dart file, use a text editor or an IDE (it is plain text Dart source code). For checking or diagnosing issues, use the Dart SDK tools such as "dart analyze" on the file or its project.

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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 .DART files

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

Windows

  1. Open the .dart file with a code editor (it is plain text).
  2. If you have the Dart SDK installed, open a terminal in the file’s folder (or project folder) and run: dart analyze <your_file.dart> to check for issues.
Full Windows guide

Mac

  1. Open the .dart file with a code editor (it is plain text).
  2. If you have the Dart SDK installed, use Terminal to run: dart analyze <your_file.dart> (or run it from the project root).
Full Mac guide

Linux

  1. Open the .dart file with a text editor or code editor (it is plain text).
  2. Use the Dart SDK tools from a terminal (for example: dart analyze <your_file.dart> or run analysis from the project directory).
Full Linux guide

iOS

  1. Open it in a text/code editor app that can view plain-text files; for development or analysis, transfer the file to a desktop system with the Dart SDK.
Full iOS guide

Android

  1. Open it in a text/code editor app that can view plain-text files; for development or analysis, transfer the file to a desktop system with the Dart SDK.
Full Android guide

Security notes

  • .dart files are source code (plain text). Opening them in a text editor is generally low risk, but running or executing code derived from an untrusted .dart file can be unsafe because it may perform harmful actions when executed in an application context.
  • Be cautious with editor/IDE extensions or tooling that automatically executes scripts, runs build steps, or fetches dependencies when you open a project containing .dart files.
  • Static analysis (for example, using the Dart SDK’s "dart analyze") is a safer first step than attempting to run or integrate unknown Dart code.

Before you run downloaded code

These files usually need a runtime (Python, Node, Java, …). They are not classic “file viruses,” but untrusted code can still do serious harm if you execute it. Prefer official packages, verify publishers, and scan archives or sketchy downloads when you are unsure.

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Can't open this file?

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

Common reasons

  • File opens in the wrong app (or as an unknown file type)
  • Analysis errors when running Dart tools
  • Text looks garbled due to encoding or line-ending differences

Fix steps

  1. Open the file from within your preferred code editor (use File → Open).
  2. Optionally set your OS file association so .dart defaults to that editor for future opens.

OS-specific troubleshooting

What is a .DART file?

A .dart file is a plain-text source file for the Dart programming language. Its contents follow the Dart language grammar and semantics defined by the Dart language specification. Tooling in the Dart SDK can parse and analyze .dart files (for example, static analysis via "dart analyze").

Background

Dart is a programming language, and .dart is its common source-file extension. These files are meant to be read and edited by developers, then processed by Dart tooling as part of an application or library.

Because .dart is source code, it is typically used inside a project rather than as a standalone “document.” The language has an official specification that defines how source code is written and interpreted.

In practice, you’ll most often interact with .dart files through an editor/IDE for reading and editing, and through the Dart SDK for tasks like analysis. The Dart SDK documentation explicitly shows analyzing a Dart file as a supported operation (e.g., "dart analyze <DART_FILE>").

Common MIME types: text/x-dart

Further reading

Authoritative resources for more details on the .DART format.

Common .DART issues

File opens in the wrong app (or as an unknown file type)

Some systems don’t automatically associate .dart with a code editor, so double-clicking may open the file in an unrelated program or prompt you to choose an app.

  1. Open the file from within your preferred code editor (use File → Open).
  2. Optionally set your OS file association so .dart defaults to that editor for future opens.

Analysis errors when running Dart tools

If the file contains syntax/type issues or depends on other files/packages in a project, Dart’s analyzer can report errors—especially when analyzing a single file outside its expected project context.

  1. If the .dart file belongs to a project, run analysis from the project root instead of only the single file (use dart analyze).
  2. Consult the analyzer output to locate the exact line/column reported and fix the indicated Dart syntax or type issue.

Text looks garbled due to encoding or line-ending differences

.dart files are plain text; if the file was created on a different system or saved with an unexpected encoding, it may display incorrectly in some editors.

  1. Reopen the file in an editor that lets you choose encoding and try UTF-8.
  2. Convert line endings (CRLF/LF) using your editor’s line-ending setting if formatting looks off.

FAQ

What is a .dart file used for?

It’s a Dart programming language source file used to write Dart code. It’s commonly part of a Dart project and is edited in a code editor/IDE and processed by Dart SDK tools.

Is .dart a binary format?

No. A .dart file is plain text source code written according to the Dart language specification.

What MIME type is used for Dart source files?

A commonly used MIME type string for Dart source is text/x-dart.

How can I check a .dart file for problems?

If you have the Dart SDK, you can run the analyzer. The Dart documentation shows using: dart analyze <DART_FILE>.

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