Decide what the Markdown is for
A repository README needs a concise path to success. An archive migration may prioritize completeness. Notes for an LLM workflow may value headings and readable tables over publication polish. Decide the destination before conversion so cleanup has a clear stopping point.
- Identify the intended reader and publishing system.
- Choose whether the original or Markdown will remain the source of truth.
- Decide whether one large file should become several focused documents.
- Record platform-specific syntax that the destination accepts.
Prepare the source document
Fixing obvious structure before upload is faster than inferring it afterward. In Word, use heading and list styles. In spreadsheets, isolate one rectangular table per sheet. In presentations, add meaningful slide titles and put essential conclusions in editable text.
For PDF, confirm the text is selectable. For CSV, JSON, and XML, validate the syntax and encoding. For HTML, upload a saved content-focused document rather than expecting the service to fetch or execute a remote web page.
Reduce sensitive input before uploading
Temporary processing lowers retention risk, but data minimization is still the best default. Remove credentials, personal information, private comments, hidden worksheets, tracked changes, and unrelated appendices whenever they are not needed for the result.
Review from structure to detail
Start with the document outline. If reading order or heading hierarchy is wrong, polishing individual punctuation will be wasted effort. Then review lists and tables, followed by links, images, code blocks, and ordinary whitespace.
- Outline: one H1, logical heading progression, no repeated page furniture.
- Flow: paragraphs and slides appear in the intended reading order.
- Structures: lists are contiguous and tables have a consistent column count.
- References: links resolve in the destination and images have useful alt text.
- Accuracy: names, numbers, formulas, and code match the authoritative source.
Know the format-specific failure modes
PDFs can mix columns or repeat headers. Word documents can hide meaning in text boxes. Slides rely heavily on spatial relationships. Workbooks contain calculations and interactive views that Markdown cannot reproduce. EPUBs may use package-relative links and endnote structures.
Do not force every source object into Markdown. A complex spreadsheet may be better linked as source data with a small explanatory table; an architecture diagram may need a maintained image plus a text description.
Validate in the final renderer
The editor preview is useful for cleanup, but GitHub, a docs framework, and a knowledge base may support different extensions. Preview or build the document in its destination, run link and style checks, and ask a subject-matter reviewer to confirm meaning before removing the original.
- [ ] Heading outline reviewed - [ ] Tables and lists render correctly - [ ] Links and image paths resolve - [ ] Sensitive data removed - [ ] Technical facts verified - [ ] Final renderer checked