chatgpt-selection-asker

A Tampermonkey userscript that sends selected text from any webpage to ChatGPT as a prefilled prompt.

After selecting text on a webpage, right-click and choose Tampermonkey -> Ask ChatGPT with selected text. The script opens a new ChatGPT tab and places the selected text into the prompt box for you.

The script does not submit the message automatically. You can review, edit, or cancel the prompt before sending it yourself.

Features

• Sends selected webpage text to ChatGPT from the Tampermonkey context menu.
• Prefills the ChatGPT prompt without automatically submitting it.
• Supports text selected inside regular pages, inputs, and textareas.
• Handles long selections without cutting them off.
• Falls back to the clipboard if ChatGPT's interface changes and automatic filling fails.
• Does not store API keys, chat history, or user data.

Installation

1. Install Tampermonkey in your browser.
2. Open chatgpt-selection-asker.user.js, or create a new userscript in Tampermonkey and paste the file contents.
3. Save and enable the script.

Usage

1. Select text on a normal webpage.
2. Right-click the selected text.
3. Choose Tampermonkey.
4. Choose Ask ChatGPT with selected text.
5. Review the prefilled ChatGPT prompt, then send it manually when ready.

Long Text Handling

For short selections, the script opens ChatGPT with the selected text in the URL query.

If the selected text is too long, the script temporarily stores the full text and opens ChatGPT with a one-time token in the URL fragment. Only that automatically opened ChatGPT tab can consume the stored text. This avoids browser or server errors such as HTTP ERROR 431 caused by overly long URLs.

Temporary text is cleared after it is successfully filled, after it expires, after the fallback flow copies it to the clipboard, or when a manually opened ChatGPT tab sees leftover temporary text without the matching token.

Notes

• The script does not replace or intercept a website's native right-click menu. It only registers a Tampermonkey menu command.
• The script only reads temporarily stored text on the automatically opened ChatGPT tab with the matching one-time token.
• If you manually open a new ChatGPT tab later, leftover temporary text is cleared instead of being filled into the prompt box.
• The script never sends the prompt automatically.
• Long selections are not truncated.
• If automatic filling fails because the ChatGPT interface changed, the script copies the text to the clipboard and asks you to press Ctrl+V manually.
• Some websites aggressively manage text selection. If the text sent to ChatGPT is not the text you just selected, select it again and use the Tampermonkey menu once more.

License

MIT