17 tools · free web demo · no key
Every endpoint, ready to try
Small, reliable utility APIs on one shared foundation. Run any of them straight from your browser, then reach for the keyed API or the MCP tool when you ship.
Validate & verify
Checksum and format checks — no external call.
Identifier Validation
IBAN, SIRET, SIREN, VAT, BIC — checksum-verified, no external call.
Free demo · no keyFactur-X Validator
Validate Factur-X / CII e-invoices — XSD, EN 16931, profile and French rules, with a graded verdict.
Free demo · no keyCard Validator
Luhn checksum + network detection (BIN/length). Format check only — not a live card check.
Free demo · no key
Encode, hash & secure
Hashing, encoding and secrets, done right.
Hash & HMAC
MD5, SHA-1/224/256/384/512, CRC32 and HMAC digests — hex or base64.
Free demo · no keyBase Encode / Decode
Encode and decode base64, base64url, base32, base32hex and hex — padding-tolerant.
Free demo · no keyJWT Decoder
Inspect a JWT's header and payload with expiry checks — decode only, no signature trust.
Free demo · no keyPassword Generator & Strength
Generate crypto-secure passwords and score strength — entropy, crack-time, warnings.
Free demo · no key
Format & transform
Reshape identifiers, text, colors and units.
UUID Generator
Generate UUID v1–v8 (RFC 9562) — random, time-ordered or deterministic (namespace + name).
Free demo · no keySlugify
Turn any text into a clean URL slug — accent transliteration, custom separator, max length.
Free demo · no keyCase Converter
Convert identifiers between camel, pascal, snake, kebab, CONSTANT, title, dot and path case.
Free demo · no keyColor Converter & Contrast
Convert hex/rgb/hsl/hsv and compute WCAG contrast ratio between two colors.
Free demo · no keyUnit Converter
Convert length, mass, temperature, volume, area, speed, data, time, pressure and energy.
Free demo · no key
Parse & inspect
Break an input down and read it back.
Cron Parser
Parse cron expressions and @macros into a human description and the next run times.
Free demo · no keyURL Parser
Break a URL into its components and normalize it — pure parsing, no network call.
Free demo · no keyTimestamp Converter
Parse unix, ISO 8601 or "now" and convert across every representation and timezone.
Free demo · no key
Dates & tax
Business days, holidays and EU VAT.