ANM2 File

What are ANM2 files and how to open them

Are you having problems opening an ANM2 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your ANM2 files.

What is an ANM2 file?

An .ANM2 file is a The Binding Of Isaac: Rebirth Animation file.

The Binding Of Isaac: Rebirth Animation format is used by the game The Binding of Isaac: Rebirth to define animated image content that appears on-screen, including character actions, effects, user interface elements, and any pictorial animation tied to game sprites. Each file stores animation data so the game engine knows what to draw, how sprites change over time, which images to load, and how different parts (e.g. limbs, effects) move or transform. These files are written by the game's tools or mods when creating or customizing animations, and read by the game engine at runtime when rendering moving graphics.

It is created and edited by the official Isaac Animation Editor that comes with the game under tools/IsaacAnimationEditor, or by third-party editors such as Anm2Ed. Modders use it to build new animation behaviors, change existing animations, or combine spritesheets with layering, events, and timing so that final animation sequences play properly in game.

Internally, the format is XML-based (though saved with a game-specific extension), with a root element called AnimatedActor. Under that are metadata ("Info") including creation date, version, and framerate; "Content" defining spritesheets, layers, null-points (placeholders for moving parts), and events; and "Animations" which define multiple named animations with frames, including root animation (affecting all layers), layer-specific and null-specific animations. Frame tags specify position, scaling, visibility, tints, cropping, rotation, and whether interpolation is used. Other fields include attributes such as Name, FrameNum, Loop, SpritesheetId, LayerName, XPivot/YPivot etc.

The file can be identified by its XML signature: it begins with the ASCII header <AnimatedActor> at offset 0, followed by additional keywords such as ANIMATIONS DEFAULTANIMATION, SPRITESHEET PATH, LAYERANIMATIONS, ROOTANIMATION, SPRITESHEETS, LAYERS, NULLS, EVENTS, and LOOP among others.

How to open ANM2 files

Important: Different programs may use files with the ANM2 file extension for different purposes, so unless you are sure which format your ANM2 file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 18, 2026

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about ANM2 file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.