Prompt Enhancer logo
100% Free · 100% Private · 100% On-Device

Prompt Enhancer

Transform rough ideas into detailed, powerful prompts for ChatGPT, Google Gemini, Claude, and Perplexity, entirely in your browser with Google's Gemini Nano.

Chrome 138+ required · No API keys · No sign-up

4
AI Platforms
100%
Privacy Protected
0ms
Network Latency
Free
Forever

Why Prompt Enhancer?

100% Privacy-First

Runs entirely in your browser using Chrome's built-in AI. Your prompts never leave your device or touch external servers.

Instant Enhancement

One-click enhancement with streaming responses. Watch your prompt transform in real-time, token by token.

Add Context Mode

A draggable context box where the AI asks clarifying questions before crafting the perfect prompt tailored to your needs.

Multi-Platform Support

Works seamlessly on ChatGPT, Google Gemini, Claude, and Perplexity. One extension, four AI platforms.

Keyboard Shortcuts

Ctrl+Shift+E for instant enhance, Ctrl+Shift+D for context mode. Stay in your flow without touching the mouse.

Prompt History

Saves up to 20 enhanced prompts on copy or insert. Click any history item to copy it to clipboard.

See It In Action

Before

Give a 3 day plan to Italy

After Enhancement

Create a detailed 3-day itinerary for a first-time visitor to Italy, focusing on Rome, Florence, and Venice. Assume a moderate budget (mid-range hotels, casual dining). Include specific attractions, recommended timings for each activity, transportation options between cities (high-speed train), and suggested restaurants for lunch and dinner. Prioritize a balance of historical sites, artistic experiences, and opportunities to experience local culture. Consider including options for different interests (e.g., art lovers, foodies, history buffs). Specify estimated costs for activities and transportation where possible. Structure the itinerary with clear daily breakdowns.

Prompt Enhancer on ChatGPT

Click the enhance icon near the text box · Ctrl+Shift+E for instant enhance · Ctrl+Shift+D for context mode

Get Started in 3 Steps

Chrome 138 or higher · No flags required · No API keys

1

Install the Extension

Add Prompt Enhancer from the Chrome Web Store. Chrome 138 or higher required.

2

AI Model Sets Up Automatically

On first launch, the extension checks for Gemini Nano. If it isn't downloaded yet, Chrome handles it in the background (~1.5 GB, one-time). The welcome page shows real-time status so you know exactly what's happening.

3

Start Enhancing

Open ChatGPT, Google Gemini, Claude, or Perplexity, type your prompt, and click the enhance icon near the text box or press Ctrl+Shift+E.

Frequently Asked Questions

Chrome Extensions APIGemini NanoJavaScriptChrome Built-in AILocal Storage APIContent Scripts

How It Was Built

Medium · Pranava Kailash

Prompt Enhancer: Bringing Local AI Power to Your Browser

A deep dive into building a Chrome extension that runs 100% on-device using Chrome's built-in Gemini Nano via the Prompt API. No API keys, no servers, no privacy trade-offs.

Read on Medium

Ready to Level Up Your Prompts?

Free, private, and works entirely on your device. No API keys, no sign-up, no data leaving your browser.

Install Prompt Enhancer · It's Free

No credit card · No sign-up · Always free