Free developer tools
Every tool runs in your browser. No signup, no upload, no tracking — open one and it works.
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Decode every base64 value in a Kubernetes Secret manifest at once, or build a paste-ready Secret from plaintext.
Open tool →See exactly which file and directory permissions a umask produces, in octal and symbolic form, with reverse lookup.
Open tool →Build the exact OpenSSL command for a self-signed cert, CSR, format conversion or inspection. Your key is never generated here.
Open tool →Decode JSON Web Token headers, payloads and claims. Flags expiry at a glance.
Open tool →Convert text to Base64 and back, with full UTF-8 and URL-safe support.
Open tool →Bulk-generate random v4 or time-sortable v7 UUIDs using the Web Crypto API.
Open tool →Convert Unix timestamps to dates and back. Auto-detects seconds vs milliseconds.
Open tool →Build a 6-field EventBridge cron expression and enforce the day-of-month / day-of-week rule automatically.
Open tool →Two-way conversion between crontab syntax and systemd OnCalendar=, including steps, ranges and shortcuts.
Open tool →Turn container memory and a reserve percentage into recommended -Xms/-Xmx or -XX:MaxRAMPercentage flags.
Open tool →Convert any MAC address between colon, dash, Cisco-dot and bare formats and read its unicast/multicast bits.
Open tool →Compute a Modbus RTU CRC-16 from hex bytes, shown in register order and true on-the-wire byte order.
Open tool →Build a valid AWS S3 Lifecycle Configuration JSON: transitions, expiration, multipart cleanup, versioning.
Open tool →Size per-node pod subnets and check your cluster CIDR has room for your node count.
Open tool →Convert Windows FILETIME (AD timestamps) to Unix time and back, sentinel values included.
Open tool →Generate a complete /etc/logrotate.d stanza: frequency, retention, compression, postrotate script.
Open tool →Build a correct nginx redirect or rewrite block, and see why return beats rewrite.
Open tool →Build a complete systemd .service file with the right sections, restart policy and environment variables.
Open tool →Generate .htaccess redirects for one URL, www/non-www, forced HTTPS or a custom RewriteRule, correctly ordered.
Open tool →Generate correct SPF, DKIM and DMARC TXT records, ready to paste into your DNS provider.
Open tool →Build both the URI and keyword/value forms of a Postgres connection string, with real percent-encoding.
Open tool →Estimate a realistic cost range for your software project from complexity, platform, and team rate.
Open tool →Estimate what your MVP will cost from feature count, add-ons, and team rate tier.
Open tool →Turn IP/CIDR notation into subnet mask, wildcard mask, network/broadcast address, and host count.
Open tool →Missing a tool you need?
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