Frequently Asked Questions (FAQ)
Below are frequently asked questions about the RustImage online sprite cutter and image processing tools. If your question is not listed here, feel free to contact us via email.
1. What is a sprite sheet?
An image that combines many small images (character frames, icons, effects, and so on) into one large image, widely used in game development, the web, and UI design. This tool finds each object in a sprite sheet automatically and cuts it out as a separate transparent PNG.
2. How do I use it?
Upload an image and every object is detected automatically, with a box and a number shown on the preview. If the result looks right, click “Download cut-outs (ZIP)”. Open “Advanced settings” only if the result is off.
3. The result isn't right — what should I change?
If objects are split into pieces, increase “Close gaps” or “Expand”. If several objects are merged, lower them or raise “Edge threshold (high)”. If noise or fine texture is picked up, raise “Smoothing”. Changes are applied automatically, and “Reset to defaults” brings back the initial settings.
4. What kind of images work best?
Images with clear contrast between the background and the objects (for example a white, black, or transparent background), with some space between objects, give the best results.
5. Which formats and sizes are supported?
PNG, JPG, and WebP, up to 4000×4000 pixels and 4 MB. Up to 1,000 objects are detected per image. Please resize or crop larger images before uploading.
6. Are uploaded images stored?
Temporarily. Contour detection runs on the server, so images are uploaded to it; the image, its file name, and the upload IP are deleted automatically about 24 hours after upload. Cut-out images and ZIP files are generated in your browser and never pass through our server. Please do not upload images containing personal information or other sensitive content. See the Privacy Policy for details.
7. What's in the ZIP?
One transparent PNG per detected object, named by number (001.png, 002.png, …), matching the numbers shown on the preview.
8. What are “Rotated boxes”?
A preview option: when on, each object is shown with a box rotated to fit it, which helps you check the detection. The exported images are not affected.
9. Can I use it on a phone?
Yes. Processing and exporting large images may be slow, so a desktop browser is recommended.
Still have questions?
If the above didn't answer your question, feel free to reach out at qltkyf@gmail.com, or head to the home page to try the tool directly.