The workbench.
Small tools that run in your browser. No signup, no upload.
Token estimator
Estimate prompt size, context headroom, and cost using your own rates and assumptions. A rough planning aid, with no claim of exact tokenization.
CSV ⇄ JSON
Convert flat data with comma, semicolon, or tab separators. Preserve text by default, with optional type inference and validation of malformed rows.
Markdown → HTML
Turn basic Markdown into HTML with a live preview. Supports headings, lists, code, emphasis, and links. Raw HTML stays escaped.