MC-025 Example: What to Do When a Court Form Runs Out of Space
See MC-025's actual fields and how a fictional attachment links to its parent form, with labeling, page numbering and perjury rules tied to the official instructions.
Read field noteThe Fylune Field Notes
Ideas about files, tools, and useful restraint.
Product notes, local-first engineering, and honest dispatches from building a document workspace in public.
PdfCraft vs Fylune: Which PDF Editor Fits Your Workflow?
Compare PdfCraft and Fylune for offline PDF work, government form templates, AI-assisted filling, privacy, and export costs. Choose by the task you need to finish.
MC-030 Declaration Example: How to Put Your Facts in Writing
A clearly fictional MC-030 declaration example plus the official structure: caption, factual paragraphs, and the penalty-of-perjury signature block.
W-9 for a Single-Member LLC: Your Name or Your Business Name?
For a disregarded LLC owned by a U.S. individual, map the owner and LLC names, the current classification box, and the owner SSN or EIN to Form W-9.
How to Fill Out a W-9 When a Client Asks for One
A line-by-line walkthrough of the current IRS Form W-9: which lines you complete, where the form goes back to, and how to send it to your client safely.
Markdown Text Color, Font Size, and Centering: HTML Workarounds
Markdown has no native color, size, or alignment syntax; this guide shows the HTML/CSS workarounds, where they work, and where renderers strip them.
Markdown Headings: H1–H6, Setext, and Heading IDs
Create Markdown headings with atx hashes and setext underlines, choose levels correctly, and understand heading IDs and auto-anchors.
How to Indent in Markdown: Spaces, Tabs, and Indented Blocks
Why Markdown collapses leading spaces, when indentation becomes a code block, tabs vs spaces, and the workarounds that actually indent paragraphs and lists.
Markdown Collapsible Sections: Details and Summary Blocks
How to create collapsible sections in Markdown using details and summary blocks, including default-open behavior and renderer support notes.
How to Escape Characters in Markdown: Asterisks, Backticks, and Underscores
How to escape Markdown characters such as asterisks, underscores, and backticks so they appear as literal text instead of triggering formatting.
Markdown Superscript and Subscript: Portable Workarounds
How to write superscript and subscript text in Markdown with portable workarounds, since core Markdown has no native syntax, and which renderers support each option.
Markdown Footnotes: References and Definitions That Render
How to add footnotes in Markdown with superscript references and definitions at the end of the file, plus troubleshooting for renderers without footnote support.
Markdown Horizontal Rule: Thematic Break Syntax and Fixes
How to create a horizontal rule in Markdown with asterisks, dashes, or underscores, why the rule sometimes disappears, and how to fix the common failure cases.
How to Write Equations in Markdown: Inline and Display Math
How to write math equations in Markdown using inline and display syntax, which renderers typeset LaTeX, and how Fylune renders KaTeX formulas in local files.
Markdown Blockquote: Quote Blocks, Nesting, and Fixes
How to write blockquotes in Markdown with the > marker: multi-line quotes, nesting, lists and code inside quotes, and fixes for quotes that stop rendering.
Markdown Underline and Highlight: Workarounds for Missing Syntax
Why Markdown has no native underline or highlight syntax, and the HTML and extension workarounds that stay portable.
Markdown Code Blocks: Fences, Inline Code, and Language Hints
Fenced and inline Markdown code syntax, backtick escaping, and language hints for syntax-highlighted code blocks.
Markdown Bold, Italic, and Strikethrough: Inline Emphasis Syntax
Inline emphasis syntax for bold, italic, strikethrough, and combined bold-italic Markdown, including underscore edge cases.
Markdown Lists: Ordered, Unordered, and Nested Syntax
Ordered, unordered, and nested Markdown list syntax, indentation rules, and fixes for lists that render as one paragraph.
How to Comment in Markdown: Hidden Notes That Never Render
Ways to add non-rendering comments in Markdown using HTML comment syntax and reference-style tricks, with portability caveats.
Markdown Line Breaks: New Lines, Hard Breaks, and Blank Lines
How line breaks, blank lines, and hard breaks behave in Markdown, and the two-space, backslash, and br-tag methods that render consistently.
How to Add a Link in Markdown: Inline, Reference, and File Links
Markdown link syntax for inline, reference-style, and relative file links, with anchor targets and broken-path checks for local project folders.
Markdown Checklist Syntax: Checkboxes, Task Lists, and Fixes
Learn Markdown checklist syntax with copyable checkbox examples, nested task lists and fixes for spacing, indentation, preview support and PDF exports.
How to Make Checkboxes in Markdown: Task List Syntax Guide
Markdown checkbox and task list syntax explained: GFM [ ] / [x] items, nested task lists, common rendering problems, and editors that render them correctly.
How to Fill Out a PDF Form Online and Check the Download
A step-by-step guide to filling out a PDF form online, including how to pick the right route for fillable and flat forms, what free tools include, and a checklist for inspecting the downloaded file before you sign or send it.
Mermaid Editor Guide: Write, Preview, and Organize Diagrams
Learn how to choose a Mermaid editor, write and debug a small diagram, keep the source beside your Markdown files, and export without losing editability.
Why local files win when AI joins the team
AI agents need inspectable state, clear permissions, and reviewable changes. Ordinary local files provide the shared ground that makes those controls possible.
Designing AI collaboration without a cockpit
Power does not have to arrive as a wall of panels, logs, and permanent inspectors.
Building Fylune in public: the first useful loop
What we are shipping first, what we are deliberately postponing, and how we will know the product is earning trust.