Quick start
SPECINE extracts every icon from a single image — sprite sheets, screenshots, asset boards — and lets you ship them at any scale or pixel size.
From the home page, drag any PNG, JPG, or WebP (≤ 10 MB) onto the dashed zone. No signup, no setup.
SPECINE auto-detects icon-shaped regions and shows them as bounding boxes. Each box has a confidence score.
Drag, resize, delete, or draw your own boxes. Rename them so the export filenames match your project.
Choose preset bundles (iOS, Android, Favicon) or type custom values like 512 px or 0.5×.
Click Export. A ZIP downloads instantly with every variant of every selected icon.
Drop & detect
Detection runs automatically on upload. The pipeline distinguishes three image types:
- →Transparent sprite sheets (PNG with alpha) — uses the alpha channel to find icon shapes precisely.
- →Dark-background images — bright icons are isolated by simple thresholding.
- →Light-background images — dark icons are isolated by inverted thresholding.
Confidence scores reflect how square and how dense each detection is. Boxes with confidence < 45% appear in red — usually false positives. Boxes ≥ 70% appear in lime.
Editor & tools
The editor uses Konva canvas with image-space coordinates — your edits are preserved at exact pixel precision regardless of zoom level.
Export settings
The export panel sits at the bottom-right of the editor. You can mix and match scales and pixel targets — every combination produces a separate file in the ZIP.
Resample modes
Different icon styles need different upscaling algorithms. Choose the right mode in the Resample selector.
Background removal
Toggle 'Auto-remove background' in the export panel. Powered by rembg (u2netp model).
First export with this enabled may take 5–40 seconds while the 4 MB model downloads. Subsequent exports are < 1 second.
Best for photo-like icons where the source has a colored or noisy background. Skip for sprite sheets that already have clean alpha — the result will be similar but slightly softer.
Hotkeys
FAQ
In local development mode (default), images stay on your machine — they're sent only to your local backend. In production deployments, uploads land in private cloud storage and are auto-deleted after 7 days.
Auto-detection looks for self-contained icon-shaped regions. Text fragments, gradients touching edges, or overlapping icons may be missed. Use Manual Draw (R) to fill in gaps.
Not yet. Use the Favicon preset to get the right pixel sizes as PNG, then merge with an external ICO bundler.
No — Real-ESRGAN runs on CPU via NCNN/Vulkan. Fast on Apple Silicon and modern Intel/AMD.
Up to 200 boxes per request. Multiply by your scales × formats for the total file count.