OpenAI to Ollama Prompt Converter

Paste an OpenAI Messages payload, convert it into Ollama Chat format, and reuse the result for local model testing. This page is useful for taking OpenAI or ChatGPT-style prompts into local Ollama workflows for self-hosted experiments and prompt portability.

Source format

Target format

Prompt template JSON

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Converted template JSON

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{
  "system": "You are a helpful assistant for software teams.",
  "messages": [
    {
      "role": "user",
      "content": "Summarize the release notes into five bullet points."
    }
  ]
}

Paste content and run the tool instantly.

This tool runs in your browser so you can reshape provider-specific prompt templates, inspect the converted payload, and reuse it in another AI stack without sending drafts to a remote processing service.

Convert OpenAI Prompts to Ollama Format

Convert OpenAI message templates into Ollama chat format for local model testing, hosted-to-local prompt migration, and self-hosted AI workflows. Ollama's /api/chat endpoint uses a similar messages structure to OpenAI but requires a model field — this tool outputs the converted payload so you can add the model name and send it to a locally running Ollama instance.

How to use OpenAI to Ollama Prompt Converter

Paste content into the prompt template json panel.

Choose the source and target provider formats, then convert the template.

Copy or download the converted JSON, then test it in the destination provider workflow.

What this tool helps you do

Convert text-only prompt templates between major provider formats

Reduce manual JSON reshaping when switching LLM APIs

Keep system, user, and assistant turns aligned across providers

Copy or download the converted template

Why this helps in AI workflows

You built a prompt for OpenAI and need to move it into Anthropic.

A Gemini payload has to be mirrored in a multi-provider app.

You are testing a local Ollama model with a hosted provider prompt.

A team wants one base prompt template with provider-specific output shapes.

Which tool should you choose?

AI Prompt Template Converter: Choose this when you need to reshape a provider-specific chat payload into another provider's message format.

AI Prompt Formatter: Choose the formatter when the prompt text itself is messy and needs cleanup before conversion.

Common problems and fixes

My OpenAI prompt template breaks when I move it to another provider.

Convert the template into the target provider's message format instead of manually reshaping every field.

I need one prompt workflow to work across several model backends.

Use the converter to generate the closest provider-specific JSON template for each API.

Switching between hosted and local models keeps wasting time on payload formatting.

Convert the template first so your request body matches the expected message structure.

Related tools

More Prompt Template Converter Pages

Frequently asked questions

What does this AI prompt template converter do?

It converts text-based chat prompt templates between common provider request formats such as OpenAI Messages, Anthropic Messages, Gemini contents, and Ollama Chat, including common ChatGPT-style and Claude-style prompt workflows.

Will the converted template behave exactly the same on every provider?

Not always. Providers such as OpenAI, Anthropic, and Gemini differ in message semantics and advanced features, so this tool is best for text-only prompt templates rather than perfect behavioral parity between ChatGPT, Claude, and other model stacks.

Does it support multimodal parts or tool calls?

The current version is focused on text-only prompt templates. Payloads with images, tool calls, or other provider-specific advanced fields may need manual review.

Is this AI prompt template converter free?

Yes. It is free to use in your browser.

OpenAI to Ollama Prompt Converter 🔒 Runs in your browser. No input data is sent to our server.