PrefillPrompt

PrefillPrompt turns a prompt into a shareable link for ChatGPT, Claude, Gemini, or Perplexity. Choose an AI and model in one searchable field, write the prompt, then tap the arrow to copy the link.

Important

The prompt is part of the URL. Anyone who receives the link—and systems that record URLs—can read it. Do not put secrets or sensitive personal information in a shared prompt.

Features

• ChatGPT, Claude, Gemini, and Perplexity destinations
• One provider-and-model combobox, searchable by names such as ChatGPT, OpenAI, Claude, Anthropic, Gemini, or an exact model
• Flexible aliases latest, latest-fast, and latest-reasoning
• A checked-in model catalog refreshed from OpenRouter through tested weekly pull requests
• ChatGPT web-search links
• Experimental temporary or incognito conversation links where the destination supports them
• Copyable URLs and Markdown buttons
• QR-code export and native Web Share where the browser supports it
• Progressively disclosed share formats, conversation options, examples, and browser-local history
• A reliable copy-and-open Gemini handoff when a public deep link cannot preserve the prompt
• A stateless Nuxt application deployed with Cloudflare Workers and Static Assets

History and preferences stay in the current browser. PrefillPrompt does not sync them between devices.

Privacy

PrefillPrompt has no account system, application database, analytics SDK, or advertising tracker. Preferences and up to six recent prompts are optional browser-local history. The app continues to work when browser storage is denied or full.

Prompt links are not private: the prompt is encoded in the URL and can appear in browser history, clipboards, QR scanners, link previews, network infrastructure, and destination-provider logs. Do not put secrets or sensitive information in a PrefillPrompt URL. See Privacy and logging for the exact storage, request, and logging behavior.

Try an example

Destination	Prompt	Link
ChatGPT with web search	Research the current state of Web Platform Baseline and cite primary sources.	Open prompt
Claude	Turn these rough release notes into a concise customer announcement.	Open prompt
Gemini	Compare three ways to add offline support to a Nuxt app, including tradeoffs.	Open prompt
Perplexity	Find primary sources explaining Cloudflare Workers Static Assets routing.	Open prompt

Prompt-link API

GET https://prefillprompt.com/api/prompt redirects the browser to the selected service with the prompt and supported options.

Query key	Required	Meaning
q	Yes	The URL-encoded prompt text. Newlines and Unicode are supported.
s	No	Service ID or recognized service alias. Supported IDs are chatgpt, claude, gemini, and perplexity. A provider-specific model may imply its service; otherwise the default is ChatGPT.
m	No	Legacy name for the service. It is used only when s is absent. New links should use s.
model	No	A provider model ID or the alias latest, latest-fast, or latest-reasoning.
web	No	Set to true or 1 to request ChatGPT web search.
temporary	No	Set to true or 1 to request ChatGPT Temporary Chat or Claude Incognito. Experimental.

For example:

https://prefillprompt.com/api/prompt?s=chatgpt&model=latest-reasoning&web=true&q=Compare%20the%20latest%20browser%20automation%20standards

https://prefillprompt.com/api/prompt?s=chatgpt&temporary=true&q=Help%20me%20brainstorm%20three%20names%20for%20a%20weekend%20prototype

Provider caveats

PrefillPrompt launches third-party web applications; those applications do not provide a single stable, documented URL API for every model and mode.

• Model and mode controls are best-effort. A service may ignore an option, fall back to its default, rename a model, or require a particular account, plan, region, or feature rollout.
• The latest* aliases intentionally move to the latest known-good mapping. Use an explicit model ID when reproducibility matters.
• web currently targets ChatGPT web search. Other services choose their own search behavior.
• temporary currently maps to ChatGPT Temporary Chat and Claude Incognito. Gemini and Perplexity have no verified URL switch for this mode.
• Gemini does not publish a dependable third-party prompt-link contract. Gemini links use a one-tap copy-and-open handoff so the prompt is not silently dropped.
• Gemini and Perplexity do not publish stable URL controls for selecting consumer models or modes, so those destinations may use their account defaults.
• Temporary or incognito mode is not a privacy guarantee. Confirm the destination UI shows the requested mode before sending sensitive content.
• The OpenRouter catalog is useful for discovering model names, but it is not authoritative for consumer web-app URL controls. PrefillPrompt does not treat OpenRouter availability as proof that a model can be selected by URL.

Local development

git clone https://github.com/ThatGuySam/prefillprompt.git
cd prefillprompt
pnpm install
pnpm dev

The development server is available at http://localhost:3000.

The repository requires Node 22.13 or newer within the Node 22 release line, or Node 24 and newer, for development and Cloudflare commands. .node-version pins Node 22.16.0, and Corepack reads the pinned pnpm version from package.json.

Commands

Command	Purpose
pnpm dev	Start the Nuxt development server.
pnpm build	Create the standard production build.
pnpm build:cloudflare	Build Nuxt for Cloudflare Workers and Static Assets.
pnpm preview	Preview the Cloudflare-targeted build locally.
pnpm lint	Run ESLint.
pnpm models:update	Validate OpenRouter's public endpoint and update the checked-in model catalog when its model set changes.
pnpm typecheck	Run Nuxt and Vue TypeScript checks.
pnpm test	Run the automated test suite once.
pnpm check	Run lint, typecheck, tests, and the Cloudflare build.
pnpm deploy:preview	Upload a Cloudflare Worker version and print its preview URL without promoting it to production.
pnpm deploy:blue	Build and upload the named blue Cloudflare preview.

Before sharing a Cloudflare preview:

pnpm check
pnpm deploy:preview

Review the emitted preview URL, including the homepage and each redirect path, before any production rollout.

Architecture

• Nuxt renders the responsive prompt builder and browser-local state.
• A shared provider registry resolves services, models, aliases, and supported modes.
• The browser bundle reads a generated model catalog; the application does not depend on OpenRouter at runtime.
• The Nitro /api/prompt route validates a link and returns an uncached redirect without storing the prompt.
• Gemini requests redirect to a first-party clipboard handoff because the consumer app has no documented public prompt-link contract.
• Cloudflare serves prerendered frontend assets first and invokes the Worker for API routes.

Contributing

1. Fork and clone the repository.
2. Create a focused branch.
3. Make the change and add or update tests.
4. Run pnpm check.
5. Open a pull request describing the behavior change and verification.

License

PrefillPrompt is open-source software available under the MIT License.