Markdown to HTML without upload

Why avoid uploading your Markdown files

Markdown documents often contain sensitive or proprietary content: draft articles, internal documentation, personal notes, code snippets with API references, or confidential project descriptions. When you upload a file to a web service, you lose control over how that content is processed, stored or retained.

Even services that claim to delete files immediately may log request metadata, cache content temporarily, or process it through third-party APIs. The safest approach is to never send the content at all.

How Flowfiles processes Markdown locally

The Flowfiles converter is built with vanilla JavaScript. When you open the tool, the parser code is downloaded to your device as part of the page. From that point, all conversion happens inside the browser's JavaScript engine:

• Your text is parsed entirely in memory by a JavaScript function.
• No XMLHttpRequest or fetch call is made with your content.
• The HTML output is written directly to the DOM or a text area.
• No browser extension, service worker, or third-party script has access to your input.
• Closing the tab removes all trace of your content — nothing is persisted.

You can verify this yourself using browser developer tools: open the Network tab before pasting your Markdown and confirm that no outgoing request is triggered.

Works offline after first load

Because the converter is self-contained JavaScript, it works offline after the initial page load. Once the page is in your browser cache, you can disconnect from the internet and continue converting Markdown to HTML without any network connection.

This makes the tool suitable for:

• Working on a plane or in an environment without internet access.
• Processing sensitive documents on an air-gapped or restricted network.
• Integrating into environments where outbound traffic is monitored or restricted.