Lottie assessment
Find what is wrong inside a Lottie file.
A deterministic diagnosis of structure, assets, fonts, compatibility risks, and payload—without rendering, executing code, or modifying your original.
Drop your animation here
or press Enter to browse · .json and .lottie · maximum 15 MB
How it works
Diagnose and optimize Lottie files safely.
Deterministic Lottie file checks
The report identifies structural, asset, font, compatibility, and file-size problems with exact paths and affected targets. It never executes expressions or fetches external resources.
Automatic Lottie JSON optimization
Supported files can be made smaller by removing unused content and resizing eligible oversized embedded PNG or JPEG images. Optimization happens locally in your browser and never changes the original upload.
Verified before download
The optimized Lottie is reassessed and compared with the original across five representative frames in both SVG and Canvas. A download is offered only when every checked frame matches exactly and the JSON file is smaller.