PNG to Sprite Sheet Packer
Upload individual PNG sprites and pack them into a single, optimized sprite sheet.
Features
Batch PNG Upload
Drag and drop as many PNGs as you need. Supported: PNG, WebP, JPEG.
MaxRects Packing
Best-in-class rectangle packing minimizes wasted atlas space.
Transparent Trimming
Automatically crop transparent borders for tighter packing.
Duplicate Detection
Identical images are packed once; aliases go in the metadata.
Multi-Resolution
Generate @2x, @1x, @0.5x variants from a single set of source images.
8 Export Formats
Unity, Godot, Phaser, PixiJS, Spine, Starling, CSS, or generic JSON.
How It Works
Upload PNGs
Drag and drop your individual sprite images.
Configure Options
Set algorithm, padding, extrusion, and scaling.
Download Sheet
Preview the packed result and download PNG + metadata.
Why Use I Love Sprites?
Packing individual PNG sprites into a sprite sheet is the most common atlas workflow for game developers. Instead of loading dozens of separate image files, a single sprite sheet reduces HTTP requests, GPU draw calls, and memory overhead. I Love Sprites automates this process entirely in your browser.
File names become frame names in the exported metadata, so name your PNGs the way you want to reference them in code (run_01.png, run_02.png…). Frames sort naturally, which keeps animation sequences in order in engines that build animations from name patterns. Transparent trimming, duplicate detection, and 1-2px extrusion are all worth enabling for character sprites; for pixel art on a strict grid, Grid packing with trimming off keeps every cell identical, which some engines' slice-by-cell importers require.
Frequently Asked Questions
Common questions about png to sprite sheet.
No hard limit. Practical limit depends on browser memory and your max atlas size setting (up to 8192×8192).
Yes. PNG alpha channels are fully preserved in the output.
MaxRects by default (best efficiency). You can also choose Shelf or Grid packing.
Each frame keeps its source file name, so name files the way you'll reference them in code — sequences like run_01, run_02 stay in order.
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