Hexloom Chat Archive by Hexloom Labs

Hexloom Chat Archive saves the conversation open in your tab as clean Markdown or JSON, with the title, date, roles and code blocks kept and YAML frontmatter that Obsidian understands.

Free
- Export the open chat as Markdown or JSON
- Works on chatgpt.com and gemini.google.com

Pro ($29/year or $4/month, bought on hexloomlabs.com/chat-archive/)
- Bulk archive your chat history (ChatGPT and Gemini; long chats may be saved only in part)
- Search your saved chats locally
- Folder sync (vault) is not available in Firefox, which lacks the needed API

Privacy
The extension sends nothing anywhere: no analytics, no remote code, no server of ours that it talks to. Saved chats live in your browser's IndexedDB. Your Pro licence key is checked offline.

Honest limits
- Claude (claude.ai) is not supported: the extension does not run there.
- Not yet verified on logged-in ChatGPT or Gemini sessions; tested against hand-written mock pages. Pro has a 14-day full refund by email.
- Long chats can be saved only in part: the newer ChatGPT layout keeps only the messages near the screen in the page, and the extension reads what is there without scrolling, so a long chat may contain only some of its messages. Gemini loads older messages only as you scroll up: versions before 0.1.6 do not scroll, so they save only the messages already loaded; from version 0.1.6 every Gemini export, free or Pro, scrolls the page to the top first (a few seconds, up to about 100 seconds for a very long chat). That scroll shows no sign that it is running (the popup stays on Reading the conversation), clicking the page closes the popup and ends the export with no file and no message, the page is left scrolled to the bottom, and it has been tried only on a hand-written mock page, not on the live Gemini. Check the message count shown after saving and keep the original chat until you have opened the file.
- Site layout changes can break export until we ship a fix.
- Bulk archive opens your chats one by one in your own session and may breach a service's terms. Use it at your own risk.
- Images are linked, not embedded. No attachments or PDF export.

Not affiliated with OpenAI, Anthropic or Google. The extension code and this listing were written with AI assistance (Claude, by Anthropic) working for Hexloom Labs.

After installing, reload any open ChatGPT or Gemini tab once; Firefox does not inject the extension into tabs that were already open.