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Aseprite to Unity: Complete Sprite Export Workflow

July 2026 · By ORH Studio · 6 min read

Aseprite and Unity are one of the most common pairings in indie 2D development — Aseprite for drawing, Unity for running. But the handoff between them involves more decisions than it first appears: export format, pixel density, slicing method, and animation clip setup all affect how your sprites look and behave in the final game.

This guide walks through the complete export-to-animation workflow, from Aseprite's export settings to Unity's Animator setup, including the import settings that are easy to miss and cause visual artifacts in pixel art games.

Exporting Sprite Sheets from Aseprite

In Aseprite, go to File → Export Sprite Sheet. The key settings to configure before exporting:

Sheet type: By Rows — packs all frames in a single horizontal strip per animation tag, easiest to slice in Unity's Sprite Editor
Layers: Merged — unless you're exporting each layer separately for shader effects or parallax
Padding: Add 1px border padding between frames to prevent texture bleeding at runtime
Trim: Leave unchecked — trimming frames to their content bounds creates variable frame sizes that break uniform slicing
Output file: Save as PNG to preserve transparency

If your project has multiple animation states (idle, walk, run, attack), export each as a separate sprite sheet PNG rather than combining them into one large atlas. Unity's Sprite Editor handles separate sheets cleanly, and keeping them separate makes asset management easier when you update individual animations.

💡 Use Aseprite's Tags feature to mark animation ranges before exporting. With the Split Layers option, you can also export each tagged animation to its own file automatically.

Setting the Correct Pixels Per Unit

Unity's Pixels Per Unit (PPU) setting determines how many pixels in your sprite equal one Unity unit in world space. Getting this right is the single most important import setting for 2D games, because it controls both visual scale and physics-relevant measurements.

The rule is straightforward: set PPU to match your frame size. A 32×32 pixel character sprite should use PPU = 32. A 16×16 sprite uses PPU = 16. A 64×64 sprite uses PPU = 64. This ensures that one sprite takes up exactly one Unity unit in world space by default, making scale and physics calculations consistent across your project.

Common Mistake

Unity's default PPU is 100. Leaving it at 100 for a 32px sprite means the character will appear tiny (about 1/3 of a Unity unit tall). Characters that look correct in the Sprite Editor will appear vastly different in the Game view.

Set PPU consistently across all sprites in your project. The easiest way is to configure a default texture import preset in Edit → Project Settings → Editor → Default Behavior Mode and update the default Sprite import settings.

Unity Sprite Editor: Slicing Setup

Once your PNG is imported into Unity's Project panel, select it and configure the import settings in the Inspector:

Set Texture Type to Sprite (2D and UI)
Set Sprite Mode to Multiple
Set Pixels Per Unit to your frame size (e.g. 32)
Set Filter Mode to Point (no filter) — this is essential for pixel art; Bilinear blurs pixel edges
Set Compression to None — lossy compression introduces color artifacts on pixel art
Uncheck Generate Mip Maps — 2D games don't use mipmaps and they waste memory
Click Apply

Now open the Sprite Editor (button in the Inspector). Click Slice → Grid By Cell Size and enter your frame dimensions. If your sheet includes padding, enter the same value in the Padding field. Set the Pivot to match your art — typically Bottom for character sprites so the character stands on the ground position correctly. Click Slice, then Apply in the top-right of the Sprite Editor.

💡 If slicing produces unexpected results, use Slice → Automatic first to see where Unity detects sprite boundaries, then switch back to Grid By Cell Size if needed. Automatic mode can reveal whether your sheet has unexpected transparent padding.

Creating Animation Clips from Sliced Frames

With the sprite sheet sliced, Unity provides two paths to create animations. The faster path: select all sliced sprites for one animation state in the Project panel, then drag them directly into the Scene or Hierarchy view. Unity will automatically prompt you to save an AnimationClip and create a GameObject with an Animator component attached.

For more control, use the Animation window directly:

Select your character GameObject and open Window → Animation → Animation
Click Create to create a new AnimationClip (name it CharacterIdle)
In the Project panel, expand the sprite sheet asset to see individual sliced frames
Select all frames for the idle animation (Shift+click) and drag them into the Animation timeline
Unity places them at even intervals; adjust the Samples value to control FPS

In the Animator Controller, set looping on idle and walk animations by checking Loop Time in the AnimationClip inspector. For one-shot clips like attack or death, uncheck Loop Time and add a transition back to idle when the clip ends.

Common Import Mistakes to Avoid

Even experienced developers run into these issues when switching between projects or working with assets from other sources:

Mistake 1

Wrong Texture Type

Leaving Texture Type as Default instead of Sprite (2D and UI) means Unity treats the sheet as a standard texture, not a sprite. The Sprite Editor won't be available and the asset won't work with SpriteRenderer components.

Mistake 2

Filter Mode Left on Bilinear

Unity's default Filter Mode is Bilinear, which softens texture edges. For pixel art, this creates a blurry look at any scale above 1:1. Always set Filter Mode to Point (no filter) for pixel art sprites.

Mistake 3

Lossy Compression on Pixel Art

Default compression in Unity uses lossy formats that introduce color banding and edge noise on pixel art, especially on sprites with large flat-color areas. Set Compression to None or use Lossless for 2D sprite textures.

Mistake 4

Inconsistent PPU Across Assets

If background tiles use PPU 16 and character sprites use PPU 32, the character will appear twice as large as intended relative to the world. Decide on a project-wide PPU before importing any assets.

Tip for Existing Projects

If you're adding sprites to an existing Unity project and aren't sure of the project's PPU, check an existing working sprite's import settings. Match your new assets to that value to avoid scale inconsistencies.

🛠 Free Tools Referenced in This Guide

Sprite Slicer Pro — Slice Aseprite exports into individual frames before Unity import
Sprite Sheet Packer — Repack individual frames into a clean sprite sheet atlas
Sprite Animation Previewer — Preview frame sequences and verify timing before importing