ls ~/tools
Small tools for everyday admin work.
Free, no sign-up, no tracking: tools I kept missing in support.
SPF checkerSPF lookup limit checkerCounts the DNS lookups of your SPF record (limit: 10).
DNS TTL plannerDNS TTL plannerPlans the TTL reduction and the move time.
Cron explainerCron expression explainerExplains cron expressions and shows the next runs.
DMARC generatorDMARC record generatorBuilds a valid DMARC record to copy.
Mail DNS checkMail DNS checkerChecks MX, reverse DNS, SPF, DMARC and MTA-STS of a domain.
Certificate checkSSL certificate checkerExpiry, chain and names of a TLS certificate.
Security headersSecurity headers checkerGrades HSTS, CSP and other security headers.
JWT decoderJWT decoderShows header, claims and expiry of a JWT — in your browser only.
SAML decoderSAML response decoderDecodes SAML responses and spots typical errors.
nginx for Nextcloudnginx config generator for NextcloudGenerates an nginx config for Nextcloud with PHP-FPM.
Explain an errorExplain an error messagePaste an error — meaning, causes and checks (AI).
Base64 encode/decodeBase64 encode and decodeEncode and decode Base64, files and Basic-auth headers included — in your browser only.
chmod calculatorchmod calculatorFile permissions octal ↔ symbolic, ready chmod commands and umask — in your browser only.
Subnet calculatorSubnet calculator for IPv4 and IPv6Works out CIDR, netmask, wildcard and hosts for IPv4 and IPv6 and splits networks into subnets.
Epoch converterEpoch converterConvert Unix timestamps to dates and back, with time zones and a year-2038 check — in your browser only.
Hash generatorHash generatorSHA-256, SHA-512, SHA-1 and MD5 for text and files, with HMAC and a compare field — in your browser only.
JSON formatterJSON formatter and validatorFormat, minify, sort and validate JSON, with errors shown by line and column — in your browser only.
Nextcloud checkNextcloud checkVersion, patch level, end of life and exposed paths of a Nextcloud.
Password generatorPassword generatorRandom passwords and passphrases with an entropy readout — generated in your browser only.
Redirect generatorRedirect generator for nginx and .htaccessGenerates redirects for nginx and Apache (.htaccess) with a curl test.