Every change, in one place.

Stay up to date with the latest features, fixes, and improvements to MaffeiTools.

September 28, 2026
UX Improvement
Markdown to HTML handles lists and tables; CSV to JSON keeps one type per column
The Markdown to HTML converter now uses a full CommonMark parser with GitHub extensions, so bullet lists written with hyphens, nested lists, tables, task lists and fenced code render correctly, and the preview shows them styled. CSV to JSON now decides each column's type from the whole column: a postal code column with one leading zero stays text in every row, long numeric ids are no longer rounded, and empty cells in numeric columns become null.
September 28, 2026
New Feature
Three new guides: Markdown, UUIDs, and CSV to JSON
The guides section gains three in-depth articles. One explains which Markdown syntax renders the same everywhere and which parts are GitHub extensions. One walks through UUID versions 4, 5 and 7 and when to use each. One covers converting between CSV and JSON without losing leading zeros, long numbers or nested data. Each links the tools it discusses and cites the specifications behind it.
September 25, 2026
New Tools
Code syntax highlighter
A new developer tool colours source code in more than 30 languages, with auto-detect and seven editor themes including GitHub, Atom One, Monokai, Nord and Tokyo Night. Copy the result as HTML with every colour written inline, as rich text for Docs, Word or email, or download it as a PNG. It all runs in your browser; nothing you paste is uploaded.
September 24, 2026
New FeaturePrivacy
Markdown editor
MaffeiTools now has a full Markdown editor at /markdown. Write in a rich editor or in plain Markdown and watch the two stay in sync, with a live preview, tables, task lists, code highlighting, find and replace, and export to Markdown, HTML, or PDF. Drafts and version history stay in your browser, and sharing works through the link itself — the document is packed into the URL, so nothing is uploaded or stored on our side. No account needed.
September 20, 2026
UX ImprovementNew Feature
Better previews when you share a link, and a catalogue Google can read
Share a category or a legal page anywhere links unfurl and you now get a card made for that page — its name, what it covers, and the tools inside it — instead of the same generic site image on every one. Behind the scenes, the sitemap now records when the tool pages were last rewritten, tool pages tell search engines where they sit in the catalogue so results show a Home > Category > Tool trail instead of a bare address, and sign-in pages are kept out of crawling so search engines spend their time on the tools.

MaffeiTools is a product of MaffeiTech LLC.

Markdown to HTML handles lists and tables; CSV to JSON keeps one type per column

The Markdown to HTML converter now uses a full CommonMark parser with GitHub extensions, so bullet lists written with hyphens, nested lists, tables, task lists and fenced code render correctly, and the preview shows them styled. CSV to JSON now decides each column's type from the whole column: a postal code column with one leading zero stays text in every row, long numeric ids are no longer rounded, and empty cells in numeric columns become null.

Three new guides: Markdown, UUIDs, and CSV to JSON

The guides section gains three in-depth articles. One explains which Markdown syntax renders the same everywhere and which parts are GitHub extensions. One walks through UUID versions 4, 5 and 7 and when to use each. One covers converting between CSV and JSON without losing leading zeros, long numbers or nested data. Each links the tools it discusses and cites the specifications behind it.

Code syntax highlighter

A new developer tool colours source code in more than 30 languages, with auto-detect and seven editor themes including GitHub, Atom One, Monokai, Nord and Tokyo Night. Copy the result as HTML with every colour written inline, as rich text for Docs, Word or email, or download it as a PNG. It all runs in your browser; nothing you paste is uploaded.

Markdown editor

MaffeiTools now has a full Markdown editor at /markdown. Write in a rich editor or in plain Markdown and watch the two stay in sync, with a live preview, tables, task lists, code highlighting, find and replace, and export to Markdown, HTML, or PDF. Drafts and version history stay in your browser, and sharing works through the link itself — the document is packed into the URL, so nothing is uploaded or stored on our side. No account needed.

Better previews when you share a link, and a catalogue Google can read

Share a category or a legal page anywhere links unfurl and you now get a card made for that page — its name, what it covers, and the tools inside it — instead of the same generic site image on every one. Behind the scenes, the sitemap now records when the tool pages were last rewritten, tool pages tell search engines where they sit in the catalogue so results show a Home > Category > Tool trail instead of a bare address, and sign-in pages are kept out of crawling so search engines spend their time on the tools.

Every change, in one place.

Markdown to HTML handles lists and tables; CSV to JSON keeps one type per column

Three new guides: Markdown, UUIDs, and CSV to JSON

Code syntax highlighter

Markdown editor

Better previews when you share a link, and a catalogue Google can read

Search tools

Every change, in one place.

Markdown to HTML handles lists and tables; CSV to JSON keeps one type per column

Three new guides: Markdown, UUIDs, and CSV to JSON

Code syntax highlighter

Markdown editor

Better previews when you share a link, and a catalogue Google can read