Labs — single-purpose dev tools.
> Free, open, no signup. Browser-only.
> Paste, click, get a result.
Email Header Analyzer — parse RFC 822 headers
Paste raw RFC 822 / MIME email headers and get a parsed, sortable view. Free, runs entirely in your browser.
List-Unsubscribe parser — RFC 8058
Paste a List-Unsubscribe / List-Unsubscribe-Post header and get the supported methods (mailto, http, one-click).
MIME decoder — parse multipart MIME
Paste raw MIME content and get a tree view of parts: headers, content-type, encoding, and decoded body for each part.
Gmail search query builder — operators reference
Build Gmail search queries from a UI form. Covers from, to, subject, has:attachment, larger:, older_than:, label:, and more.
MCP server config generator
Generate an MCP server configuration block from a form. Outputs JSON ready to paste into any MCP client config.
claude_desktop_config.json generator
Build a claude_desktop_config.json snippet from a form. Picks the right shape for Claude Desktop.
Image resize calculator
Calculate target width/height while preserving aspect ratio. Useful for inline email images, signatures, and CSS sizing.
Each utility is a single static page. Nothing is uploaded — parsing happens in the browser. Want this kind of thing running against your real inbox? See /tools for the full Connect My Email catalog.