OttoFill

Autofill that learns the forms you fill, on your device

Browser extension Published Since Jun 2026 Platforms: Chrome and Firefox

OttoFill is an autofill extension for Chrome and Firefox, for people who fill in a lot of web forms. It remembers every form you fill and fills new ones for you, privately and on your device, using on-device embeddings and an encrypted local store.

It is free to install and works offline.

What it does

  • Learns from the forms you fill and fills the next one
  • On-device embeddings with ONNX Runtime WebAssembly
  • Encrypted local store; works offline
  • Optional Pro or bring-your-own-key LLM tier through a Cloudflare Worker

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