The email signature parser is a free Chrome extension offered by parsio.io. It uses chatgpt to extract contact details from email signatures in Gmail and can send them to various applications such as Google Sheets, webhooks, Airtable, and Zapier. Advanced features such as automatic sending of parsed data and data deduplication are available with the purchase of a lifetime license key. The extension extracts first name, last name, email, job title, company, phone, and website. A free OpenAI API key is needed to use the extension.