Hermet Pro

Batch processing. Run the formatter, the CSV converter, or the type generator over many files in one go. Batch CSV merges every file into one spreadsheet with a _source column naming the file each row came from; batch types produce one named section per file.

Large files. On the JSON Formatter, pastes over 512 KB are formatted in a background worker, so the page never freezes. Free use still works — past about 2 MB you will see a note suggesting Pro.

Workspaces. Save the current input under a name and load it back later. Workspaces are stored in this browser, on this device — never uploaded, never synced.

Offline app. Install Hermet and every tool works with no connection at all.