ChatJPT
A single HTML file to access OpenAI, Anthropic, and Google Gemini from your browser. No installation, no intermediary server, no database.
What ChatJPT does
Locally encrypted API keys
Your OpenAI, Anthropic, and Google keys are encrypted with AES-GCM via the browser's WebCrypto API and stored in your localStorage. They never pass through any server.
OpenAI, Claude, and Gemini
Select your provider and model from the same interface. Available models cover the recent lineups of all three providers, including extended reasoning variants.
Image and Video generation
Generate images via OpenAI (GPT Image 1 through 2) or Gemini (Nano Banana, Imagen 4). Generate videos via Sora 2 (OpenAI) or Veo 3.1 (Gemini), with aspect ratio and duration options.
Extended thinking
Thinking mode is available for Claude (configurable token budget), Gemini 2.5 and Gemini 3 (thinking levels), and natively for o3, o4-mini, and Gemini 3.1 Pro.
Built-in chart engine
Models can render interactive charts directly in the conversation: bar, line, pie, histogram, scatter, area, box, treemap, pictograph, and heatmap — all drawn in HTML5 Canvas.
File attachments
Attach text files, source code, images, or PDFs. PDFs are extracted page by page locally via pdf.js before being sent. Images are transmitted as base64.
Code mode
Generated code blocks include syntax highlighting, a copy button, and direct download in the matching file format (CSV with BOM, JSON, Python, etc.).
Bilingual interface
The interface switches between French and English with one click. Language, theme, and model preferences are remembered between sessions.
History and export
Conversation history is saved in the browser and can be exported as Markdown + JSON or PDF. A button lets you regenerate the last response or resume a truncated generation.