Mailster

100% free email tools

Make your email look worth reading.

Mailster is a home for free tools and honest guides about email — signatures, deliverability, newsletters and marketing. Built for founders, freelancers and marketers who want emails that actually get replies.

Build your email signature Browse all tools
No sign-up
Open a tool and use it.
No paywalls
Every tool is free, forever.
Privacy first
Your input stays in the browser.

Start with one of these

Three tools most people open first. Each one runs instantly in your browser — nothing to install, no account to create.

View all 5 tools →
Email signature generator Create a clean, professional signature in 30 seconds for Gmail, Outlook or Zoho Mail. Open tool → SPF, DKIM & DMARC checker Check your domain's email authentication setup and stop landing in spam. Open tool → Countdown timer generator Build an email-safe countdown timer snippet for Gmail, Outlook and Apple Mail, with colours and a text fallback. Open tool →

Built for the email you actually send

Most email problems are small and specific: a signature that looks wrong in Outlook, a subject line that never gets opened, a domain that keeps landing in promotions. Mailster exists to make those problems quick to fix, without a sign-up wall or a sales call.

Every tool here does one job and stops. Nothing leaves your browser unless a lookup genuinely requires it, there is no account to manage, and nothing is held back for a paid tier. If a tool cannot do what you need, tell us and we will build the missing piece.

Email doesn't have to be hard

Most email advice is recycled hype. Mailster writes from experience — what worked to get replies, land in inboxes and grow a list.

  • Plain-English explainers — every tool page explains what it checks and why it matters.

  • No fluff — we skip the "skyrocket your open rates" nonsense.

  • Straight answers — tools and guides that respect your time and your inbox.

Explore the tools

One email principle we stand by

"Respect the inbox and the inbox respects you. Short, clear, personal — that's the whole secret."