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Mailvelope

Browser extension for OpenPGP encryption in webmail

Mail Servers ★ 1.8k stars Medium setup AGPL-3.0

Mailvelope is a browser extension that adds OpenPGP end-to-end encryption to existing webmail interfaces such as Roundcube. The companion key server can be self-hosted for key discovery within an organization.

Official siteSource code

Key features

  • OpenPGP in the browser
  • Works with existing webmail
  • Self-hostable key server
  • Open standard encryption

Strengths

  • Released under the AGPL-3.0 license
  • Active community (1.8k GitHub stars)
  • Written in JavaScript
  • Tiny footprint — runs in 128 MB RAM

Is Mailvelope secure?

No known vulnerabilities affect Mailvelope's latest release (v6.3.0). OSV.dev lists 4 past advisories for the project; none of them applies to this release. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

  • Most recent fixed advisory CVE-2019-9149, published 2019-07-09 (2654 days ago), fixed in 3.3.0

Source: OSV.dev, checked 2026-10-14. How this is measured.

Mailvelope replaces

Self-hosted ProtonMail alternatives

Health badge

Maintain Mailvelope? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 83 · excellent

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   :alt: SelfHostIndex health score for Mailvelope
   :target: https://selfhostindex.com/app/mailvelope/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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