anim

.anim — Animation File

Unity Technologies · 2005

Developer
Unity Technologies
Category
Game Files
MIME Type
application/vnd.unity
First Released
2005
Open Format
No
File Signature
Not applicable, binary asset format within Unity.
At a Glance
.anim
Animation File

.anim files are used by the Unity game engine to store animation data for characters and objects.

Reviewed on June 21, 2026
Compression
Compressed
Transparency
N/A
Editability
High (within Unity)
Best for
In-game animation

Key Features

  • Stores animation sequences for Unity games.
  • Defines keyframes, curves, and property changes over time.
  • Supports a wide range of animatable properties.
  • Optimized for efficient loading within the Unity engine.

Best For

  • Character animation within Unity.
  • Complex object transformations in real-time.
  • Procedural animation driven by game logic.
  • Sequencing animations for cutscenes.

Less Ideal For

  • General video editing.
  • Standalone 2D sprite sheet animation.
  • Web-based animations without Unity.
  • Archiving raw animation data outside of Unity.

Common Use Cases

  • Animating character movements (walking, running, jumping).
  • Creating cinematic cutscenes within a game.
  • Animating environmental elements like doors or machinery.
  • Defining facial animations for dialogue or expressions.

How to Open It

  1. Open the Unity editor.
  2. Import or locate your .anim file within your Unity project's Assets folder.
  3. Double-click the .anim file to open it in the Animation window for editing.
  4. Assign the animation clip to a GameObject with an Animator component.

What is a .anim file?

The .anim file format is a proprietary format used by the Unity game engine to store animation data. It defines keyframes, curves, and other properties that control how objects and characters move within a game. These files are crucial for bringing characters and environments to life, enabling everything from subtle facial expressions to complex combat sequences. Unity automatically generates and manages these files when you import animation clips or create them within the engine.

Programs That Open .anim Files

PlatformProgram
WindowsUnityFreeOfficial
macOSUnityFreeOfficial
LinuxUnityFreeOfficial
Web BrowserUnity WebGL PlayerFreeOfficial

How to Convert .anim Files

FormatMethod
.FBXExport from Unity
.JSONCustom script/plugin for Unity

Common Problems with .anim Files

⚠️ Animation not playing in Unity.
Ensure the GameObject has an Animator component, the Animator Controller is correctly set up, and the .anim file is assigned as an Animator State.
⚠️ Imported animation is jerky or incomplete.
Check the animation import settings in Unity, such as frame rate, scale, and whether tangents/degrees are being imported correctly.
⚠️ Large file size for .anim assets.
Unity's compression settings for animations can be adjusted during import or build process. Consider optimizing the animation curves themselves.

Frequently Asked Questions

Can .anim files be opened outside of Unity?▼

No, .anim files are proprietary to Unity and cannot be directly opened or edited by standard media players or animation software outside of the Unity editor.

What is the difference between .anim and AnimationClip?▼

AnimationClip is the Unity class that represents animation data; .anim is the file format Unity uses to store and serialize these AnimationClips in the project.

Can I create .anim files from scratch?▼

While you can't create a raw .anim file in a text editor, you can create and edit animations directly within Unity's Animation window, which then saves as .anim files.

Technical Details

Internally, .anim files are binary assets within the Unity project. They reference AnimationClips, which contain animation curves for various properties like position, rotation, and scale. The data is often compressed to reduce file size and improve loading times in the game.

Did You Know?

The .anim format is tightly integrated with Unity's Animator component, which manages state machines for animations.
While primarily for 3D, .anim files can also be used to animate 2D sprites and UI elements within the Unity engine.

Security Information

As .anim files are used within the Unity game engine, they are generally safe when sourced from trusted Unity projects. Malicious code is not typically embedded within animation data itself, but could theoretically be part of a compromised Unity project.