Defog — Auto Text & Word Replacer

About

Defog automatically replaces text on every webpage you visit. Map UUIDs, IDs, hashes, codes, or any text pattern to a human-readable label — and never squint at a raw identifier again.

Create a mapping once, and Defog replaces every occurrence across every site you visit. Replacements survive page navigation, dynamic content updates, and single-page app re-renders.

Your data never leaves your browser. All mappings are stored locally. Fully open source: https://github.com/ayoung19/defog-extension

Who is it for?

Developers & DevOps
Replace UUIDs, API keys, commit hashes, container IDs, and database row IDs with meaningful names across dashboards, logs, and admin panels.

Support & Operations
Map ticket IDs, customer IDs, and order numbers to names or descriptions so you can scan queues and dashboards faster.

QA & Testing
Turn opaque test data and environment identifiers into readable labels while reviewing test results or staging environments.

Analysts & Data Teams
Replace encoded dimension values, experiment IDs, or feature flag keys with plain English on analytics dashboards.

Students & Language Learners
Swap vocabulary words, abbreviations, or foreign terms with translations or definitions as you read.

Content & Well-being
Replace distracting, triggering, or unwanted words with alternatives as you browse.

Anyone
Nicknames for friends, inside jokes, or just making the internet a little more fun.

Key Features

- Instant text replacement across all websites
- Works on dynamic pages — survives React re-renders, SPA navigation, and DOM mutations
- Simple popup UI — add a mapping in seconds
- Global on/off toggle — pause all replacements with one click
- Dark mode, light mode, and system theme support
- Unlimited mappings — no caps, no paywalls
- All data stored locally in your browser — nothing is sent anywhere
- Fully open source

Coming Soon

- Replacement templates — control how replacements render (e.g. "Andy Young (ebbaf2eb…)" or just "Andy Young")
- Hover tooltips — see the original text on hover without replacing it
- Import & export — share mapping sets with teammates
- Site-specific rules — apply mappings only on certain domains
- Regex pattern matching — match patterns instead of exact strings