Free browser tool
Lottie JSON Optimizer
Format and minify Lottie JSON locally, with a before-and-after byte comparison.
Choose a file to begin.
How to use this Optimized JSON converter
Choose a Lottie JSON file, let the browser process it, then preview and download the Optimized JSON result. There is no account step and no server upload in this workflow.
Lottie files describe animated layers and timing in JSON. For specification-level validation, compare the result with the Lottie Animation Format documentation.
Practical notes
- • Keep the original file so you can compare visual output.
- • Minification removes whitespace; it does not redraw the animation.
- • Embedded raster assets can still dominate the final file size.
Frequently asked questions
Can I use this Lottie JSON to Optimized JSON converter without uploading a file?
Yes. The selected file is processed in your browser and is not sent to a Mascofast upload endpoint.
What does this lottie json optimizer change?
It reads the Lottie JSON input and creates a Optimized JSON result. The original remains unchanged, so you can retry with different source settings if needed.
How do I check the converted Optimized JSON file?
Preview the result here, then open it in the browser, editor, app, or game where it will be used. Codec support, transparency, timing, and embedded assets can vary by runtime.
Need a mascot animation after conversion? Explore the Mascofast tools collection.