★ Free utilities
My everyday toolkit 🧰
Browser-based utilities for systems and DevOps work. Free, no sign-up, and nothing you type is ever sent to a server.
38 tools · all live
Tools
Utilities
Number Base ConverterBinary, octal, decimal and hex — with the bits laid out and 64-bit exactness.Unix Timestamp ConverterEpoch to date and back, with the unit detected rather than guessed.UUID & ULID GeneratorRandom v4, time-ordered v7 and ULIDs — plus an inspector.URL Encoder & InspectorEncode, decode, and pull a URL apart into its pieces.Data Size ConverterKiB vs KB, and why 1G is not 1Gi in Kubernetes.Base64 Encode / DecodeText or files, both directions.QR & Barcode GeneratorAny link or text into a downloadable QR code.JSON Formatter & ViewerBeautify, minify and explore JSON — without rewriting your data.XML Formatter & ViewerBeautify, minify and explore XML, mixed content left intact.JWT DecoderInspect a token's header and claims. Never verified server-side.Markdown EditorWrite Markdown with a live preview and download the .md file.Significant FiguresCount a number's significant figures — with the why — and round to any precision.
Networking
Subnet / VLSM CalculatorSplit a network into subnets, or check what a CIDR actually covers.My IPYour public IP address and where it resolves to.DNS LookupA, AAAA, MX, TXT and more, straight from the browser.IP & Domain Owner LookupIs this address valid — and whose network is it? Asked of the registries themselves.MAC LookupFind the vendor behind a MAC address or OUI.
Security & keys
CHMOD CalculatorOctal and symbolic Unix permissions, both directions.Password GeneratorStrong random passwords, generated in your browser.Hash GeneratorMD5, SHA-1, SHA-256/384/512 and HMAC — for text or a file.SSL Certificate ToolkitCSR, issued certificate, key match and deployment — the whole procedure on one guided page.Scam Link CheckerUnsure about a link from an SMS or WhatsApp? See the tricks built into it — without ever opening it.RSA Key GeneratorKey pairs via WebCrypto — the private key never leaves the page.
DevOps & cloud
docker run → ComposePaste a docker run command, get a compose file back.Kubernetes Resource CalculatorRequests, limits and node sizes — how many pods actually fit, and on how many nodes.systemd Unit GeneratorA correct service unit from a form — restart policy, sandboxing, and the install commands.nginx Reverse-Proxy GeneratorA proxy server block with TLS, websockets and redirects — commented line by line.Log-Line Parser PlaygroundBuild a regex against one real log line, live — named groups become a fields table.SLA & Error BudgetTurn an uptime target into the downtime it actually allows.Cron ParserExplain a cron expression in plain English.YAML ⇄ JSONConvert between YAML and JSON, with validation.Regex Tester & GuideTry a pattern against real text, see every match and group — with the cheatsheet built in.Text DiffPaste two versions of anything and see exactly what changed, line by line.Galera Health CheckPaste SHOW STATUS LIKE 'wsrep%' output and read the cluster's verdict.HAProxy Config LinterStructural checks on haproxy.cfg — the mistakes that 503 in production.Load Test Sizer (Gatling)From target req/s to concurrent users and a ready injection profile.K8s YAML MakerBuild correct Kubernetes manifests — Deployments to HPAs — with the full scheduling toolbox.
Why these run in your browser. A password or key generated on a server could be logged by that server. Generating it in your browser means it provably never leaves the page — reload and it is gone. Every tool here works the same way.