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ByHand for Gmail

ExtensionCommunication
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Item media 1 (screenshot) for ByHand for Gmail
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Overview

Prove you typed your email yourself. One click in Gmail adds a small certificate that anyone can verify.

Anyone can generate AI slop email now. Which means an email you actually typed is worth something, if you can prove it. ByHand puts a "Certify by hand" button next to Send in Gmail. One click adds a small signature line to your email with a link to a public certificate. Whoever reads it can check that a human typed it. AI-generated text can't be certified. Edit the email after certifying and the certificate comes off. Certify again when you're done. PRIVACY No accounts, no tracking, no analytics. Your words never leave Gmail. A certificate holds a fingerprint of the message, a timestamp, and our signature. Nothing else. Policy: https://byhand.email/privacy $2 a month through Stripe. Unlimited certificates, cancel whenever. We donate the proceeds to artists who make things by hand.

Details

  • Version
    0.1.0
  • Updated
    August 25, 2026
  • Features
    Offers in-app purchases
  • Offered by
    ByHand
  • Size
    31.15KiB
  • Languages
    English
  • Developer
    Zeila, Inc.
    251 Little Falls Drive Wilmington, DE 19808 US
    Email
    hello@byhand.email
    Phone
    +1 415-305-8696
  • Trader
    This developer has identified itself as a trader per the definition from the European Union and committed to only offer products or services that comply with EU laws.

Privacy

Manage extensions and learn how they're being used in your organization

ByHand for Gmail has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.

ByHand for Gmail handles the following:

Authentication information
Personal communications
User activity

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes
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