Developer & Text Tools

239 tools · page 4 of 4

• 🌐IDN Punycode Converter Convert an internationalized domain name between Unicode and ASCII Punycode (xn--) form in both directions.
• 🔣File Signature (Magic Number) Lookup Identifies a file format from its leading magic-number bytes, matching the hex signature against common image, archive, document and executable types.
• 0️⃣Leading Zero Counter Counts the leading zero bits (CLZ) of an unsigned integer for a chosen bit width.
• 🇸🇪Sweden Personnummer Validator Validates a Swedish personnummer by running the Luhn checksum over the first nine digits (YYMMDD-NNN) and comparing it to the final check digit. Separators are stripped automatically.
• 📄Base64 Size Calculator Calculate the encoded size and overhead when encoding data as Base64.
• 🐫Camel Case Converter Convert any phrase into camelCase and PascalCase by splitting on spaces, underscores, hyphens and punctuation.
• 🎨Color Name to HEX Converter Converts a standard CSS color name to its HEX code and RGB value.
• 🔬IEEE 754 Single Decoder Decodes a 32-bit IEEE 754 single-precision float from 8 hex digits, showing the value plus sign, exponent and mantissa fields.
• 🌐IPv6 Compress Calculator Compresses a fully expanded IPv6 address by stripping leading zeros and collapsing the longest run of zero groups into ::.
• 🧮Hamming Weight Calculator Count the number of set bits (1s) in a non-negative integer entered in decimal, hexadecimal, or binary. Also called population count or popcount.
• 🌐Wildcard Mask Calculator Convert a dotted-decimal subnet mask to its inverse wildcard mask, as used in Cisco ACLs and OSPF. Each octet becomes 255 minus the mask octet.
• 🔤Base85 RFC 1924 Encoder Encode a non-negative integer into a Base85 string using the RFC 1924 alphabet by repeated division by 85.
• 📋CSV to Markdown Table Converter Converts comma- or semicolon-separated CSV data into a formatted Markdown table with selectable column alignment.
• 🔢GTIN-14 Check Digit Calculator Calculates the GS1 mod-10 check digit for a GTIN-14 from its first 13 digits and returns the complete 14-digit code.
• 🔁JSON to XML Converter Converts a simple JSON object into pretty-printed XML, turning each key into an element and nesting child objects, wrapped in a root tag.
• 🧹Strip HTML Tags Tool Strips all HTML tags and decodes entities, returning clean plain text and a character count.
• 🔐Umask Calculator Convert a umask value into the default permissions it produces for new files (666 & ~umask) and directories (777 & ~umask).
• 🌐Bandwidth-Delay Product Calculator Calculate the bandwidth-delay product (optimal TCP window) from link bandwidth and round-trip time.
• 🔐Homophonic Substitution Cipher Encodes text with a simplified educational homophonic substitution scheme where the same letter maps to different 2-digit codes depending on its position.
• 🧾NDJSON to JSON Array Converter Parses newline-delimited JSON (one object per line) and combines the lines into a single pretty-printed JSON array.
• 🌐Whois Field Reference Look up what a field in a domain WHOIS record means, such as creation date, registrar, name server or domain status.
• 🔠Constant Case Converter Convert any text or identifier to CONSTANT_CASE by splitting on spaces, hyphens and camelCase boundaries, then joining the uppercased words with underscores.
• 🔐Diffie-Hellman Key Calculator Computes the Diffie-Hellman shared secret and public keys from a prime, generator and two private keys.
• 🌐Punycode Converter Encodes a single Unicode domain label to its Punycode (xn--) form using the RFC 3492 bootstring algorithm.
• 🔐VIC Cipher (Straddling Checkerboard) Encoder Encodes text with a straddling checkerboard, the substitution core of the VIC cipher. Simplified: it omits chain addition and transposition, so it is not the full VIC cipher.
• 📡Baud to Bitrate Calculator Calculate bit rate from baud rate and bits per symbol. Baud to Bitrate Calculator gives you the result instantly from a simple input.
• 🔐Bech32 Encoder Encode a human-readable prefix and witness-program hex bytes into a checksummed bech32 string (BIP173).
• 🔀Bitwise AND OR XOR Calculator Compute the bitwise AND, OR and XOR of two non-negative integers, with the XOR shown in binary.
• 🔐BSD Checksum Calculator Computes the classic BSD sum-16 checksum of input text (the 16-bit rotate-and-add algorithm used by the Unix sum command), in decimal and hex.
• 🔡Checkerboard Polybius Variant Tool Encodes or decodes text with a keyword-mixed Polybius square (a checkerboard variant), mapping letters to row/column digit pairs.
• 🎨Complementary Color Calculator Finds the complementary color of a hex value by rotating the hue 180° in HSL, and also gives the RGB-invert alternative.
• ⏰Cron Expression Explainer Parses a 5-field cron expression (minute hour day-of-month month day-of-week) and describes when it runs in plain English.
• ⏰Crontab Next Run Calculator Parses a standard 5-field crontab expression and lists the next scheduled run times after a base time (UTC).
• ⌨️Dvorak Substitution Converter Convert text as if the same physical keys were typed on the other keyboard layout, mapping each letter between QWERTY and Dvorak key positions.
• 🌐Internet Checksum Calculator Calculate the 16-bit Internet checksum (RFC 1071) of hexadecimal data — the one’s-complement sum used in IP, TCP and UDP headers. Verify or generate header checksums.
• 📄JSON Array to NDJSON Converter Convert a JSON array into newline-delimited JSON (NDJSON), emitting one compact JSON value per line for streaming, logs and data pipelines.
• ✏️Levenshtein Distance Calculator Compute the Levenshtein edit distance between two strings and their similarity percentage.
• 🧽Mocking Case Text Generator Converts your text into the SpongeBob mocking meme style with alternating upper and lower case letters.
• 📄Page Count Estimator Estimate the page count from a word count. Page Count Estimator gives you the result instantly from a simple input.
• 🔑Passphrase Generator Builds a memorable word-based passphrase from a 1,583-word list: random by default, or reproducible from a seed you choose. Reports the entropy.
• 🔐Password Strength Calculator Entropy of your password from its character set and an estimate of the time to crack it by brute force.
• 🔐Phillips Cipher Encoder/Decoder Encode or decode text with the Phillips cipher, which uses eight keyed 5x5 Polybius squares cycled across each five-letter block.
• 📱Phone Keypad Translator Converts letters to the digits on a telephone keypad (ABC=2 ... WXYZ=9), so you can dial a vanity phone number.
• 🐷Pig Latin Translator Translate English text into Pig Latin, moving leading consonants and adding the right ending.
• 🔣Regex Escape Tool Escapes regular-expression metacharacters in your text by prefixing each with a backslash, so the string matches literally.
• 🔤Remove Accents Tool Strip accents and diacritical marks from text, converting letters like é, ü and ñ to plain ASCII.
• 🔡ROT13/ROT5 Combo Tool Apply ROT13 to letters and ROT5 to digits in one transform, a common puzzle and obfuscation cipher. Copy the result with one click.
• 🔢Semantic Version Validator Check whether a string is a valid Semantic Versioning 2.0.0 version and break out its major, minor, patch, pre-release and build parts.
• ↹Spaces to Tabs Converter Convert each run of leading spaces at the width you set into tab characters, line by line.
• ✏️Tally Marks Converter Converts a whole number into tally marks, grouping every five with a crossed group symbol.
• 👊Tap Code Translator Converts text to and from tap code, the 5x5 Polybius knock cipher used by prisoners.
• 🔤Title Case Converter Convert any text to proper title case, keeping short words like 'of' and 'the' lowercase.
• 🎨Triadic Colors Calculator Find the two triadic partner colors (hue ±120° on the color wheel) for any hex color and get the full three-color palette.
• 🧾VAT Number Validator Checks an EU VAT number's format against its country prefix and required length (DE, FR, IT, ES, NL), with a German checksum note. Format check only — not a live registry lookup.
• 🔤Vowel and Consonant Counter Count the vowels and consonants in a text. Vowel and Consonant Counter gives you the result instantly from a simple input.
• 🎨Web-Safe Color Snapper Snaps each RGB channel of a hex color to the nearest web-safe value (0, 51, 102, 153, 204, 255) and returns the matching hex code.
• 📊Word Frequency Counter Count how often each word appears in a text, sorted from most to least frequent.
• 💾Words to Bytes Converter Converts between machine words and bytes for a selectable 16-, 32- or 64-bit word size, in either direction.
• 📨yEnc Decoder Decode a yEnc-encoded string back to text (or hex for binary). Simplified: handles the = escape and skips =ybegin/=ypart/=yend header lines without reading their filename, part or CRC.