Don's Tools · Developers · Chat Transcript Format Converter

Chat transcript format converter

Paste a conversation in one format and convert it to another. Supports OpenAI and Anthropic JSON, ChatML, Llama 3 and plain text, with the input detected automatically, all in your browser.

Paste a conversation (any format below)
Convert to
Chat Transcript Format Converter changes a conversation from one format to another in your browser. It reads OpenAI or Anthropic messages JSON, ChatML, the Llama 3 header format and plain Role: text, detecting the input automatically, and converts to whichever format you choose with the tabs. System prompts are handled correctly for each target, including being separated out for Anthropic, and multi-line turns are preserved. Nothing you paste is uploaded.
Frequently asked questions
Is my conversation uploaded?
No. The transcript is parsed and converted entirely in your browser. Nothing you paste is sent anywhere or stored.
Which formats does it understand and produce?
It reads OpenAI or Anthropic messages JSON, ChatML, the Llama 3 header format, and plain Role: text, detecting the input automatically. It can output any of those formats, chosen with the tabs.
How does it know my input format?
It looks at the content: JSON arrays are read as messages, the ChatML and Llama markers are recognised by their special tokens, and anything else is read as plain lines that start with a role such as User: or Assistant:.
How are system messages handled for Anthropic?
Anthropic keeps the system prompt separate from the messages, so any system turns are merged into a top-level system field and the remaining user and assistant turns go into the messages array.
Will it keep multi-line messages intact?
Yes. In plain text mode a message continues across lines until the next role label, and in the other formats the full content of each turn is preserved when converting.