GO
Godot
AtlasTexture · SpriteFrames
- Import as AtlasTexture
- Filter clip + padding
- Mipmaps off for pixel art
Use the Godot bundle — editor script builds AtlasTextures from trim-aware regions.
Game Dev LabStep 3 of 9
Sprite Sheet Generator
Pack multiple sprites into optimized texture atlases for Godot, Unity and modern 2D engines.
Workspace
Upload once · inspect the atlas · export for your engine
No sprites yet
Generated atlas
Your packed atlas preview
Dense pack
Your atlas will appear here
Upload PNG / JPEG / WebP. Packing stays in your browser.
Frame strip
Drag to reorder · order maps left→right, top→bottom in grid mode
Your imported frames will appear here in order.
Upload
PNG · JPEG · WebP
Layout
How sprites are arranged on the atlas
Bin-packs each sprite tightly. Best default for mixed sizes and photos.
Selected sprite
Hover or click a packed sprite to inspect it.
SettingsShowHide
Atlas Size
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Occupancy
0%
Optimization insights
Production metrics from the current atlas — not marketing copy.
Pack sprites to see efficiency, GPU memory, and suggestions.
Engine compatibility
Supported exports and import notes for common 2D engines.
UN
Unity
Sprite Atlas · Multiple mode
- Pixels Per Unit 100
- Point filter for pixel art
- Sprite Mode: Multiple
Drop the Unity bundle into Assets/ and run the helper to apply sprite metadata.
GA
GameMaker
Texture pages · PNG
- Import PNG atlas
- Map frames via JSON
- Watch page size limits
Export PNG + JSON, then assign frames on a texture page.
PH
Phaser
Atlas JSON · Multi-atlas
- Phaser 3 atlas JSON
- Load with this.load.atlas
- Trim offsets preserved
Phaser preset JSON loads directly with the atlas PNG.
CO
Construct
Sprite sheet · PNG
- Import as sprite sheet
- Match frame size
- Use padding carefully
Use the PNG atlas; define frames from the exported JSON sizes.
Learn & best practices
Production advice from shipped 2D games
Padding
Keep 1–2px between sprites so bilinear samples never bleed. Extrude 1px duplicates edge colors into the gap.
Texture bleeding
Bleeding shows as colored fringes. Fix with padding + extrude, or Point filtering for pixel art.
Filtering
Pixel art → Point / Nearest. Smooth HD → Bilinear with enough padding. Never mix both on one atlas without care.
Power-of-two atlases
Prefer 512² / 1024² / 2048² when targeting older GPUs, mipmaps, or compressed formats.
Mipmaps
Enable only if sprites shrink on screen. Mipmaps + zero padding = bleed. Prefer POT + padding first.
Animation optimisation
Keep frame order stable. Grid packing preserves cell rhythm for AnimationPlayer / Animator clips.
Draw calls
Sprites that share one atlas can batch. Split atlases by material/shader, not by character pose.
GPU memory
RGBA8 ≈ width × height × 4 bytes. A 2048² atlas is ~16 MB uncompressed — trim and pack before upscaling max size.
Texture compression
Compress in-engine (ETC2 / ASTC / DXT). Export clean PNG here; let the engine compressor handle blocks.
Common mistakes
- Zero padding with bilinear filtering — classic bleed.
- One enormous 8192 atlas for a handful of UI icons.
- Packing UI and world sprites on one sheet then forcing different filters.
- Ignoring trim offsets so animations jitter after import.
Common presets
Click a preset to update packing configuration instantly
Continue your game dev workflow
Idea → level → art → collision → audio → progression
GDD Generator
Earlier step
Level Generator
Earlier step
Sprite Sheet Packer
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Autotile Generator
Build a full 47-tile terrain set from two source tiles.
Auto Hitbox
Trace a sprite's alpha into a collision polygon automatically.
Collider Simplifier
Reduce collision vertex count without changing hit behaviour.
Retro SFX
Synthesize 8-bit jumps, coins and explosions in the browser.
XP Balancer
Model level curves, gold flow and stat progression.
Loot Simulator
Verify drop rates with Monte Carlo simulation before shipping.
Frequently asked questions
What image formats are supported?
PNG, JPEG, and WebP. PNG with transparency is recommended for game sprites so trimming and packing stay accurate.
Is there a sprite limit?
Packing runs in your browser. Hundreds of frames are fine; very large sets (1000+) may take longer depending on atlas size and device memory.
Can I pack animation frames?
Yes. Use animation-safe grid mode when frame cells must stay consistent for timelines. Reorder frames in the strip to match your clip order.
What atlas sizes are supported?
Max texture size can be 1024, 2048, 4096, or 8192. Power-of-two and square options help engines that prefer POT textures.
Why does padding matter?
Padding prevents texture bleeding when filtering or mipmaps sample neighboring sprites. Pixel art usually needs 1–2px; HD may need more with bilinear filtering.
What is trimming?
Transparent margins are cropped before packing. Metadata keeps original size and trim offsets so engines can restore alignment.
What can I export?
PNG atlas plus Generic JSON, Phaser 3 atlas JSON, Unity/Godot import bundles, plus XML and CSS for pipelines that expect those formats.
Does this work with Godot and Unity?
Yes. Godot and Unity presets export trim-aware specs and helper scripts. Phaser gets atlas JSON ready to load.
Will packing improve performance?
One atlas reduces texture binds and draw-call pressure versus dozens of loose textures — especially important on mobile GPUs.
Does anything leave my browser?
No. Packing, preview, and ZIP generation are fully client-side. Nothing is uploaded.
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More free browser-based game development tools
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Turn a game idea into a structured, scoped design document.
2D Procedural Level Generator
Generate seeded 2D levels and export them as engine-ready tilemaps.
Bitmask Autotile Generator
Build a full 47-tile terrain set from two source tiles.
Auto Hitbox Generator
Trace a sprite's alpha into a collision polygon automatically.