Fehmer-Tech Tools

Fast, privacy-friendly tools that run locally in your browser.

We do not save any information!

🌐

Networking & Homelab

CIDR calculator, WireGuard AllowedIPs builder, IP converter, port checker, and DNS record helpers.

WireGuardCIDRIPDNSNetworking
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Dev Tools

JSON/YAML converter, regex tester, cron expression builder, and timestamp converter.

JSONYAMLRegexCronTimestamp
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Text & Data

Text diff tool, case converter, lorem ipsum generator, markdown previewer, and CSV viewer.

DiffCaseLoremMarkdownCSV
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Mail & DNS Records

SPF, DMARC, DKIM generators and validators. Email header parser for debugging.

SPFDMARCDKIMEmailHeaders
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Docker / Reverse Proxy

Traefik labels, Caddyfile, Nginx config generators. Docker Compose snippets and best practices checker.

TraefikCaddyNginxDockerCompose
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Security / Tokens

JWT decoder, password generator, hash calculator, Base64 encoder/decoder, and URL tools.

JWTPasswordsHashBase64URL

Privacy First

Everything runs locally in your browser. We do not save any information, make no external requests, and use no tracking or analytics.

All tools are 100% client-side and work offline once loaded. Your data never leaves your device.