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Free developer tools
Small, focused utilities for the jobs that come up around running a site — free to use, with nothing to sign up for.
- DNS LookupCheck any record type on three public resolvers and the domain's own nameserver, and see whether a change has propagated.
- SPF Record GeneratorBuild the SPF record that authorises your email providers to send as your domain, with the lookup limit checked as you go.
- DMARC Record GeneratorChoose a policy and where reports go, and get the DMARC record to publish at _dmarc on your domain.
- Favicon GeneratorTurn an image or a letter into favicon.ico, the PNGs every platform asks for and a web manifest — made in your browser.