Notepad 1.2

Notepad can now show a rendered preview of many file types.

New: a button at the right end of the menu row switches a tab between its text and a preview. It appears for these files:

• Markdown (.md), with tables, task lists, colored code blocks, formulas and Mermaid diagrams
• HTML (.html) and SVG (.svg)
• CSV and TSV as a table
• JSON, YAML, TOML, XML and property lists as a tree that opens and closes
• Jupyter notebooks (.ipynb), shown with their saved outputs, nothing is executed
• Mermaid (.mmd) and Graphviz (.dot, .gv) diagrams
• Diffs and patches, with added lines in green and removed lines in red

The preview uses the colors and the font of the chosen appearance mode. It reads only files in the folder of the previewed file and loads nothing from the internet unless you allow it. The settings have a new section "Preview" with two switches: "Run Scripts in HTML Files" (on) and "Load Content from the Internet" (off).

New: the Open dialog grays out files that are certainly not text, such as images, archives and PDFs.

Changed: the download grew from about 1 MB to about 3 MB, because the libraries for Markdown, formulas and diagrams are included.

Download: Notepad-1.2.zip below. Unzip it and move Notepad.app to the Applications folder, replacing the old one.

First start: the app is not notarized by Apple, so macOS blocks it once. Open System Settings > Privacy & Security, scroll to "Security" and click "Open Anyway". The README has the full steps.

Runs on: macOS 15.0 or later, Apple silicon and Intel. Built and tried on Apple silicon; the Intel part has not been tried on an Intel Mac.