Parchmint is a desktop Markdown editor designed to present documents exactly as they are interpreted by large language models (LLMs). It addresses the challenge of ensuring that prompts, skill files, and documentation appear to machine readers as intended, eliminating discrepancies between human-friendly formatting and the raw input processed by AI models. The tool is aimed at users who need precise control over how their Markdown content is tokenized and parsed by LLMs, such as prompt engineers and those preparing documents for machine consumption.
A key feature of Parchmint is its "honest preview," which displays the document as a tokenizer would parse it, rather than rendering for human aesthetics. This includes a live token count using OpenAI's o200k tokenizer—exact for GPT models and approximate for others like Claude—and real-time warnings if the document nears or exceeds a specified token budget. The editor also highlights pseudo-tags and raw HTML directly in the preview, ensuring that nothing is hidden or silently ignored. Structural linting and document-type detection help catch malformed outlines or frontmatter that could disrupt prompt behavior, while a live outline and navigation pane allow users to jump to any heading or section efficiently.
Parchmint provides three view modes—source, split, and preview—that can be toggled with a keystroke. It supports inline rendering for diagrams (Mermaid), mathematical notation (KaTeX), and syntax-highlighted code blocks. The application is built on Tauri and Rust, ensuring a local-first approach where files remain on disk and changes from outside the editor are detected. No account is required, and the tool operates without telemetry or data collection.
The editor is available as a free and open-source application under the MIT License. It can be downloaded for Windows (MSI installer), macOS (signed and notarized DMG), and Linux (AppImage and DEB formats), with the option to build from source using npm and Tauri. Parchmint is crafted for those who require an exact, machine-oriented view of Markdown documents, ensuring that what is written is precisely what the model reads.
Parchmint sits in PulseGate's IDEs & code editors category. It focuses on ensuring Markdown documents appear to AI models exactly as intended, avoiding formatting surprises. It is built as an open-source project for prompt engineers. Parchmint is open source under the MIT license. It runs on the web, macOS, Windows, and Linux.
It is developed by Parchmint Contributors, and the product first shipped in 2026. Development happens publicly on GitHub with 21 commits in the last 90 days. Key capabilities include token preview, markdown editing, and local-first.
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Show HN: Parchmint – a Markdown editor that shows what the AI actually reads verified by the PulseGate indexer
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