Useful widgets you can embed anywhere.
Widgety ships small tools with strict validation, tested formulas, and a safe compute engine. Every tool works on Widgety.io and via a one-line embed snippet.
Use the top-right Search button (or press Ctrl/⌘+K) to quickly find tools by intent.
Accurate
Golden examples + property checks keep calculators honest.
Fast
Minimal JS, static pages, edge-cached assets.
Embeddable
Script embed and iframe embed with auto-resize.
Popular tools
UUID / GUID generator
Generate UUIDv4 identifiers (aka GUIDs). Optionally use a seed for deterministic, reproducible output.
JSON formatter
Pretty-print and minify JSON. Optionally sort keys for stable, comparable output.
JSON checker
Validate JSON and show the top-level type (object, array, string, number, boolean, or null).
Text comparer
Compare two texts and get a line-based diff plus an overall similarity score.
IPv4 subnet calculator
Compute network/broadcast addresses, netmask, and host range from an IPv4 address and CIDR prefix.
Base64 encode/decode
Encode text as Base64 (or Base64URL) and decode Base64 back to UTF‑8 text.
CRC32 checksum
Compute CRC32 (IEEE) checksum of text (UTF‑8 bytes) in hex and decimal.
Slugify text
Convert text into a URL-friendly slug (kebab-case or snake_case).
Loan payment calculator
Compute monthly payment, total payment, and total interest for a fixed-rate amortizing loan.
BMI calculator
Calculate body mass index (BMI) from weight and height, including standard BMI categories.