CIDR Subnet Calculator
Parse CIDR blocks, compute ranges, split into smaller subnets, and check whether an IP lives inside a network.
Open toolTools
Small developer utilities that run entirely in your browser — nothing you paste leaves your machine.
Runs locally in your browser
Tools are ported from DevOps Daily under the MIT license.
Networking
Security
JWT Decoder
Inspect any JWT in your browser. Nothing is sent to a server.
Open toolUUID and Secret Generator
Cryptographically secure random identifiers and secrets, generated in your browser.
Open toolHash and Checksum Generator
MD5 / SHA hashes of text or a file, plus a checksum verifier. Browser-only.
Open toolEncoding
Base64 and URL Encoder / Decoder
Encode or decode base64 and URL strings in real time.
Open toolYAML / JSON Formatter and Linter
Validate, format, and convert YAML and JSON. Browser-only.
Open toolTime & scheduling
Cron Expression Parser
Decode cron expressions with the next run times, in your local timezone.
Open toolUnix Timestamp Converter
Epoch to date and back. UTC, local, ISO 8601, and relative time, with a live clock.
Open toolKubernetes
Kubernetes Resource Calculator
Plan Kubernetes requests and limits without guessing. See node-fit, cluster totals, and recommended burst.
Open tool