Generate European VAT Number

Create structurally valid EU VAT numbers for invoicing demos, ERP tests, and signup form fixtures.

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Browse Tool Plaza by category—A2A agent skills for developers, everyday calculators, media tools, leisure helpers, and health estimators.

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Encoders, hashes, validators, and format converters as A2A skills for APIs and debugging. Each page includes docs plus execute examples for agents.

Generate European VAT Number

Create structurally valid EU VAT numbers for invoicing demos, ERP tests, and signup form fixtures.

validategeneratevat-number🇬🇧en

Generate random European IBAN

Create structurally valid sample IBANs by country for payment-form testing, banking demos, and QA fixtures — not real issued account numbers.

ibanvalidategenerate🇬🇧en

Validate European VAT Number

Verify European VAT identification numbers against country format rules.

validategeneratevat-number🇬🇧en

Validate IBAN

Paste an IBAN and validate it online

ibanvalidategenerate🇬🇧en

Validate IBAN by country

Choose the expected country and verify whether the IBAN is structurally valid for that country.

ibanvalidategenerate🇬🇧en

Build query string

Serialize a flat JSON object into an URL-encoded query string for HTTP client construction.

encodedecodeurl🇬🇧en

Calculate Italian tax code from personal data

Derive an Italian fiscal code from personal data, birthplace, and gender.

validategeneratefiscal-code🇬🇧en

Calculate Luhn check digit

Compute the Luhn mod-10 check digit for a numeric identifier prefix

checksumvalidateluhn-check-digit🇬🇧en

Canonical JSON

Parse JSON and re-serialize with recursively sorted keys for deterministic hashes and diffs.

jsonconvertformatter🇬🇧en

Case convert

Transform identifiers between camelCase, snake_case, kebab-case, PascalCase, and CONSTANT_CASE for code and APIs.

textcase-convert🇬🇧en

Collapse whitespace

Replace runs of spaces, tabs, and newlines with a single space for cleaner plain text.

textcollapse-whitespace🇬🇧en

Count characters

Count every character in a string including spaces and punctuation—complements the word counter.

textcount-characters🇬🇧en

Count words

Count whitespace-separated words in a pasted string—useful for copy limits and readability checks.

textcount-whitespace🇬🇧en

CSV to JSON

Parse delimiter-separated values into a JSON array of objects when a header row is present.

jsonxmlcsv🇬🇧en

Decode JWT

Paste a JWT and view its header and payload decoded directly in the browser.

jwtcipherdecode🇬🇧en

Decrypt AES

Recover plaintext from AES ciphertext when you supply the matching passphrase and mode

cipherconvertfrom-aes-to-message🇬🇧en

Decrypt DES

Decode legacy DES ciphertext for compatibility testing—56-bit DES is not secure today

cipherconvertfrom-des-to-message🇬🇧en

Decrypt Rabbit

Decrypt Rabbit stream-cipher output when you know the original secret key bytes

cipherconvertfrom-rabbit-to-message🇬🇧en

Decrypt RC4

Decode RC4 ciphertext for legacy compatibility checks and capture-the-flag puzzles

cipherconvertfrom-rc4-to-message🇬🇧en

Decrypt RC4(drop)

Decrypt RC4-drop ciphertext that skips the first 256 keystream bytes before encoding

cipherconvertfrom-rc4-drop-to-message🇬🇧en

Decrypt Triple DES

Decrypt Triple-DES (3DES) ciphertext when the same passphrase and settings were used to encrypt

cipherconvertfrom-triple-des-to-message🇬🇧en

Deep merge JSON

Merge a base JSON document with an overlay—nested objects combine and arrays concatenate.

jsonconvertformatter🇬🇧en

Edit text

Capitalize, uppercase, or lowercase your text easily. Start by pasting your text and clicking the button to begin

textgeneratetexts🇬🇧en

Encrypt AES

Protect messages with AES symmetric encryption—the modern standard for confidential data

cipherconvertfrom-message-to-aes🇬🇧en

Encrypt DES

Encrypt with single DES for education and legacy interoperability, not production secrets

cipherconvertfrom-message-to-des🇬🇧en

Encrypt Rabbit

Encrypt with the Rabbit stream cipher—a fast eSTREAM portfolio algorithm for short payloads

cipherconvertfrom-message-to-rabbit🇬🇧en

Encrypt RC4

Encrypt with RC4 stream cipher—deprecated in TLS but still found in older applications

cipherconvertfrom-message-to-rc4🇬🇧en

Encrypt RC4(drop)

Encrypt using RC4-drop, discarding initial keystream bytes to reduce bias attacks

cipherconvertfrom-message-to-rc4-drop🇬🇧en

Encrypt Triple DES

Apply Triple-DES encryption by running DES three times for stronger legacy block protection

cipherconvertfrom-message-to-triple-des🇬🇧en

Extract emails

Pull unique email addresses from pasted notes, logs, or HTML snippets using a practical pattern match.

textextract-emails🇬🇧en

Extract matches

Apply a regex with flags to an input text and list every match found.

regextextextract-matches🇬🇧en

Format JSON

Pretty-print or minify JSON directly in your browser without uploading it.

jsonxmlconvert🇬🇧en

Format XML

Indent XML or SVG markup for easier reading during debugging and code review.

jsonxmlcsv🇬🇧en

From ASCII codes to text

Paste numeric codes (any common separator) and convert them back to text.

encodedecodeascii🇬🇧en

From HTML entities to text

Convert HTML entity references back to their original characters.

encodedecodehtml-entities🇬🇧en

From JSON to XML

Paste JSON data and convert it to XML quickly without sending data to a server.

jsonxmlconvert🇬🇧en

From text to ASCII codes

Paste text and convert it to a space-separated list of ASCII numeric codes.

encodedecodeascii🇬🇧en

From text to HTML entities

Convert special characters into HTML-safe entity references for web markup.

encodedecodehtml-entities🇬🇧en

From text to URL-encoded

Paste text and encode it for safe use in URL query parameters and paths.

encodedecodeurl🇬🇧en

From URL-encoded to text

Paste URL-encoded text and decode it back to its original characters.

encodedecodeurl🇬🇧en

From XML to JSON

Paste XML data and convert it to JSON structure directly in your browser.

jsonxmlconvert🇬🇧en

Generate Italian tax code

Create random codice fiscale profiles for onboarding demos, QA fixtures, and Italian form testing.

validategeneratefiscal-code🇬🇧en

Generate Luhn number

Build numeric identifiers with a valid Luhn check digit for test cards and identifiers.

checksumvalidateluhn-generate🇬🇧en

Generate text (Lorem Ipsum)

Generate placeholder Lorem Ipsum text by word count, length, or paragraphs.

textgeneratetexts🇬🇧en

JSON Path Tools

Json utilities Processing runs locally in your browser.

json🇬🇧en

JSON to CSV

Flatten JSON arrays or objects into comma-separated rows for spreadsheets and ETL scripts.

jsonxmlcsv🇬🇧en

JSON to YAML

Turn JSON documents into readable YAML for configs, Helm charts, and CI pipelines.

yamljsonconvert🇬🇧en

JSON-LD generator

Create schema.org WebSite, Article, or FAQPage JSON-LD script blocks for rich results and machine-readable page metadata.

seogeneratejson-ld-generator🇬🇧en

Leetspeak encoder

Transform letters into leetspeak substitutions (a→@, e→3, i→1) for stylized nicknames or puzzles.

textleetspeak🇬🇧en

License plate

Generate plausible European license plates by country format for UI demos and form testing.

generate🇬🇧en

Markdown

Preview GitHub-flavored Markdown in the browser after you submit

markdowntext🇬🇧en

Meta tags generator

Build title, description, canonical, Open Graph, and Twitter Card tags for richer search snippets and link previews.

seogeneratemeta-tags-generator🇬🇧en

Minify JSON

Remove whitespace from JSON documents to shrink payloads for logs or network transfer.

jsonconvertformatter🇬🇧en

Parse query string

Convert application/x-www-form-urlencoded query strings into a JSON object for agent API tooling.

encodedecodeurl🇬🇧en

Password strength

Estimate password strength with entropy-based scoring in your browser

passwordvalidate🇬🇧en

Pretty-print JSON

Expand minified JSON into indented multi-line text for debugging APIs and config files.

jsonconvertformatter🇬🇧en

Read text

Choose the pace, pitch, and voice itself. Paste your text and start reading with your preferred voice

textgeneratetexts🇬🇧en

Reading time

Count words and estimate silent reading minutes at about 238 words per minute for blog posts and docs.

textreading-time🇬🇧en

Remove accents

Normalize Unicode text by stripping accents and diacritics for ASCII-friendly filenames or search keys.

textremove-accents🇬🇧en

Remove newlines

Join multiline pasted text into a single line by stripping carriage returns and line feeds.

textremove-newlines🇬🇧en

Reverse text

Flip character order in a pasted string—handy for puzzles, palindrome checks, and mirrored text experiments.

textreverse-text🇬🇧en

robots.txt generator

Compose crawler allow and disallow directives plus an optional sitemap URL into a standards-compliant robots.txt file.

seogeneraterobots-txt-generator🇬🇧en

Sign JWT HS256

Build a signed JWT from a JSON payload and shared secret using HMAC-SHA256 in the browser.

jwtciphersign-hs256🇬🇧en

Sitemap tools

Generate sitemap XML content from CSV rows in a quick browser-based workflow

seoxml🇬🇧en

Slugify text

Turn titles into URL slugs with configurable separator and casing for permalinks and file names.

textslugify🇬🇧en

Sort lines

Sort pasted lines ascending or descending, with optional numeric-aware ordering.

textsort-lines🇬🇧en

Split vowels and consonants

Extract lowercase vowels and consonants from Latin letters in your text—useful for linguistics drills and word games.

textsplit-vowels-consonants🇬🇧en

Strip HTML tags

Strip angle-bracket tags from HTML snippets and keep the visible text content for previews or plain-text exports.

textstrip-html🇬🇧en

Test pattern

Enter a regex pattern with flags and input text to check whether it matches.

regextexttest-pattern🇬🇧en

Truncate text

Cut text to a maximum character length and append an ellipsis when shortened for previews.

texttruncate🇬🇧en

Unique lines

Deduplicate lines with optional case folding, trimming, and keep-first or keep-last rules.

textunique-lines🇬🇧en

Valid CSV

Validate CSV spreadsheets with configurable delimiter and header row options.

validatecsv🇬🇧en

Valid HTML

Check HTML markup for well-formed structure and common syntax issues.

validatehtml🇬🇧en

Valid JSON

Parse and validate JSON data for syntax errors with clear error feedback.

validatejson🇬🇧en

Valid SVG

Check SVG markup for XML syntax, tag structure, and common vector-graphic mistakes before shipping assets.

validatesvg🇬🇧en

Valid XML

Validate XML documents for proper syntax, nesting, and tag balance.

validatexml🇬🇧en

Valid YAML

Check YAML documents for indentation, syntax, and parsing errors.

validateyaml🇬🇧en

Validate Italian tax code

Check whether an Italian codice fiscale matches formal checksum and format rules.

validategeneratefiscal-code🇬🇧en

Validate Luhn checksum

Validate credit card and identifier numbers using the Luhn mod-10 algorithm.

checksumvalidateluhn-validate🇬🇧en

Validate MOD-97 checksum

Check whether a numeric string passes the ISO 7064 MOD-97 control test.

checksumvalidatemod-97🇬🇧en

Validate URL

Test whether a pasted string matches common HTTP/HTTPS URL patterns including hostnames and IPv4.

textvalidate-url🇬🇧en

Verify JWT HS256

Validate a JWT signed with HS256 by recomputing the HMAC signature with your shared secret.

jwtcipherverify-hs256🇬🇧en

XML & XPath Tools

XML/HTML utilities Processing runs locally in your browser.

xml🇬🇧en

YAML to JSON

Paste YAML or YML and get formatted JSON output without uploading files to a server.

yamljsonconvert🇬🇧en

Chmod calculator

Convert Unix file permission modes between symbolic forms like rwxr-xr-x and octal values like 755.

developercronsemver🇬🇧en

Color mixing

Blend two colors effortlessly! Use our web app to mix hues and instantly see the resulting color. Try it now

colorconvertcolors🇬🇧en

Contrast checker

Measure contrast ratio between foreground and background hex colors for accessibility compliance.

colorconvertcolors🇬🇧en

Convert from date to Unix timestamp

Turn calendar dates and times into Unix epoch timestamp values.

timedateconvert🇬🇧en

Cron parser

Decode a five-field cron schedule into a readable summary and the next upcoming run times from the current moment.

developercronsemver🇬🇧en

From base64 to text

Decode Base64-encoded strings back to readable plain text in your browser.

encodedecodebase64🇬🇧en

From Base64url to text

Decode URL-safe Base64url strings back to UTF-8 text for JWT and token debugging.

encodedecodebase64🇬🇧en

From Binary to Text

Convert binary digit sequences (0 and 1) into readable text characters.

encodedecodebinary🇬🇧en

From CMYK to RGB

Convert CMYK percentages into RGB channel values

colorconvertcolors🇬🇧en

From decimal to hex byte

Convert a decimal byte (0–255) into a two-digit hex value

colorconvertcolors🇬🇧en

From HEX byte to decimal

Convert a hex byte (e.g. FF) into its decimal value

colorconvertcolors🇬🇧en

From HEX to HSL

Pick a hex color and read hue, saturation, and lightness channels for theme and design work.

colorconvertcolors🇬🇧en

From HEX to RGB

Convert CSS hex colors to RGB decimal values and CSS rgb() syntax.

colorconvertcolors🇬🇧en

From hex to text

Decode spaced or continuous hex byte sequences back into readable text characters.

encodedecodehex🇬🇧en

From HSL to HEX

Set hue, saturation, and lightness, then convert your HSL color into a HEX value instantly.

colorconvertcolors🇬🇧en

From RGB to CMYK

Convert RGB channel values into CMYK percentages (C, M, Y, K)

colorconvertcolors🇬🇧en

From RGB to HEX

Convert RGB color channel values into hexadecimal color codes.

colorconvertcolors🇬🇧en

From text to base64

Encode plain text or strings into Base64 format instantly in your browser.

encodedecodebase64🇬🇧en

From text to Base64url

Encode plain text to URL-safe Base64 without padding—used in JWT segments and web tokens.

encodedecodebase64🇬🇧en

From Text to Binary

Encode text characters into their 8-bit binary representation string.

encodedecodebinary🇬🇧en

From text to hex

Encode each UTF-8 byte of your text as spaced lowercase hex pairs—ideal for debugging and wire dumps.

encodedecodehex🇬🇧en

From Unix timestamp to date

Convert Unix epoch seconds into human-readable local date and time.

timedateconvert🇬🇧en

Generate a random color

Generate a random color with optional hue and saturation bounds for mockups and themes.

colorconvertcolors🇬🇧en

Generate base64-encoded secret

Generate a cryptographically random secret as Base64 or hex for API keys and tokens.

generatepasswordcipher🇬🇧en

Generate CSV data

Export sample person records as comma-separated CSV rows for testing and fixtures.

generatejsonxml🇬🇧en

Generate JSON data

Export sample person records as a formatted JSON array for testing and fixtures.

generatejsonxml🇬🇧en

Generate MD5

Compute an MD5 cryptographic hash digest from any text message in your browser.

hashhashingMD5🇬🇧en

Generate random password

Build random or pronounceable passwords with charset toggles, length, and batch count in your browser.

generatepasswordcipher🇬🇧en

Generate RIPEMD-160

Compute a RIPEMD-160 hash digest from text for checksums and crypto use.

hashhashingRIPEMD-160🇬🇧en

Generate self-signed certificates

Create RSA self-signed X.509 TLS certificates with PEM keys in the browser.

generatepasswordcipher🇬🇧en

Generate SHA-1

Produce a SHA-1 hash digest from text using the SHA-1 algorithm in the browser.

hashhashingSHA-1🇬🇧en

Generate SHA-2

Generate SHA-2 family hashes (SHA-256, SHA-384, SHA-512) from text input.

hashhashingSHA-2🇬🇧en

Generate SHA-3 (Keccak[c=2d])

Hash messages with SHA-3 (Keccak) at selectable output bit lengths.

hashhashingSHA-3🇬🇧en

Generate text data

Create sample person records with names, addresses, and contact fields for testing.

generatejsonxml🇬🇧en

Generate unique server names

Generate random names for servers and hosts

generaterandom🇬🇧en

Generate UUID

Create UUIDs in versions 1, 3, 4, or 5 with optional namespace and name.

uuidgenerate🇬🇧en

Generate XML data

Export sample person records as structured XML documents for testing and fixtures.

generatejsonxml🇬🇧en

Generate YAML data

Export sample person records in YAML format for configuration and test fixtures.

generatejsonxml🇬🇧en

HMAC MD5

Generate an HMAC-MD5 hex digest from a message and secret key for older checksum schemes.

hashcipherhmac🇬🇧en

HMAC SHA-1

Generate an HMAC-SHA1 hex digest from a message and secret key for legacy integrations.

hashcipherhmac🇬🇧en

HMAC SHA-256

Generate an HMAC-SHA256 hex digest from a message and secret key—common for API signatures and webhooks.

hashcipherhmac🇬🇧en

HTTP status lookup

Map an HTTP status code to its reason phrase and a short explanation for debugging APIs and browsers.

developercronsemver🇬🇧en

Nanoid

Generate URL-safe NanoID strings with crypto-quality randomness in the browser

nanoididrandom🇬🇧en

Number base converter

Convert integers between binary, octal, decimal, hexadecimal, and any base from 2 to 36

binaryhexoctal🇬🇧en

Semver compare

Check whether one semver string is greater than, less than, or equal to another, with numeric major/minor/patch deltas.

developercronsemver🇬🇧en

Unique URIs and URLs

Create unique resource addresses

generateurl🇬🇧en

Validate UUID

Verify UUID string format and validity for versions 1 through 5.

uuidgenerateverify🇬🇧en

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