Speech Recognition Polyfill Userscript

Get extremely fast, free, & accurate server-side multilingual Speech Recognition. Polyfills Web Speech API on any browser!

As of 2026-03-03. See the latest version.

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Author: apersongithub
Ratings: 0 0 0
Version: v1.0
Created: 2026-03-03
Updated: 2026-03-03
Size: 47.3 KB
License: MIT
Applies to: All sites

This is a one-time userscript that provides only Google's server-side speech recognition as a polyfill, no further updates will be implemented. Use the (firefox-only) extension listed here for a better experience: https://github.com/apersongithub/Speech-Recognition-Polyfill

This userscript is the exact same speech recognition polyfill for voice search as on google.com and youtube.com. Remember to speak loud and clear.
This uses Google Cloud Speech API v1 ONLY. Punctuation and grammar is only supported with Google Cloud Speech API v2 (https://speechs3proto2-pa.googleapis.com/s3web/prod/streaming/channel).
This usersript may cause issues with sites that have their own polyfill implementation for unsupported browsers (not many do).
The image below is the actual extension but it works practically the same minus the customization options.