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This question already has an answer here:

I have a geojson file, but it's way too heavy for the app I need to develop

I'd like to know what alternative do I have to make it lighter.

I was thinking about simplifying it's shapes, and also turning to topojson.

Could you recommend me some tool to achieve this?

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Edit: I saw the other thread stating how to convert to topojson, but I'd also like to simplify the shapes, they are much too detailed for the visualization I'm working on.

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marked as duplicate by Devdatta Tengshe, Get Spatial, PolyGeo, MappaGnosis, RyanDalton Sep 24 '13 at 14:11

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
This is a very very late answer but for other people looking for a solution you can also use a node module called geojson-mend npmjs.com/package/geojson-mend. – pewpewlasers Jan 21 at 13:28

Use TOPOJSON, I had a 20 MB file and topojson simplified it down to 300 KB!

See here: https://github.com/mbostock/topojson/wiki for instructions and how to install.

You want to play with this parameter: --simplify-proportion

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