Markdown Table Builder (GFM)
Visual editor for GitHub Flavored Markdown tables. Add/remove rows/columns, left-center-right alignment, pretty mode auto-balances widths.
Editor for markdown tables — GFM standard. Pretty mode auto-aligns column widths so the .md file reads cleanly on GitHub. Pipes inside cells are escaped automatically.
Markdown table syntax (GFM)
GitHub Flavored Markdown (GFM) is supported almost everywhere: GitHub, GitLab, Notion, Obsidian, ChatGPT, Claude, Discord. Syntax:
| Header 1 | Header 2 | Header 3 |
| :------- | :------: | -------: |
| Left | Center | Right |
| cell | cell | cell |- First row: header, automatically bold.
- Separator row:
:---(left),:---:(center),---:(right). - Pipes inside cells: escape with
\\|. - Line breaks inside cells: use
<br>(HTML), NOT \\n.
When to use it
- Docs / README: comparison tables, API specs, feature lists.
- GitHub issues / PRs: test data, screenshot diffs in table form.
- Notion / Obsidian: paste tables from this tool into your note system.
- Blogs / Docs sites: Astro/Hugo/Docusaurus render markdown tables natively.
- LLM prompts: structured table input helps the model parse better than long JSON.
Pretty vs Compact mode
- Pretty mode (default): balanced column widths via padding — the .md file looks great in any text editor.
- Compact mode: no padding — denser source. GitHub renders both identically.
Use Pretty for READMEs and docs; Compact for LLM prompts (saves tokens).
Who this is for
Fullstack/backend/devops engineers — debug JWT, format JSON/SQL, parse cURL, compute CIDR subnets, draft Mermaid diagrams, write conventional commits… Daily toolkit alongside your terminal and editor.
FAQ
Is my pasted code/token sent anywhere?
No. All TopDev dev tools run 100% client-side — JWT, SQL, JSON, cURL, regex… process in-browser. Disconnect to verify. Safe for internal tokens, production DB queries, API keys.
Does it work offline / install as a PWA?
Tools work offline after the first load. Installable PWA is on the roadmap — for now you can bookmark and use without internet.
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