Developer & Text Tools

239 tools · page 3 of 4

• 🔢Text to Decimal Converter Converts text to space-separated decimal Unicode code points and back, so "Hi" becomes "72 105".
• 🔢Add Line Numbers Tool Adds sequential line numbers to the start of every line of pasted text.
• 🌐IPv4 to Integer Converter Convert a dotted IPv4 address to its 32-bit integer form, or convert an integer back to an IPv4 address, with the hexadecimal representation.
• 🔤Sort / Dedupe Lines Sort the lines of text alphabetically (A→Z, Z→A) or remove duplicate lines.
• 📡Morse to Text Calculator Convert text to Morse code or decode Morse code back into readable text, supporting letters A–Z, Turkish Ç Ğ Ş Ö Ü, digits 0–9 and common punctuation.
• 🌐CIDR Host Count Calculator Find how many usable IP hosts and total addresses a CIDR subnet prefix provides, plus its dotted subnet mask.
• 📝Word Count Tool Count the words, characters (with and without spaces), lines, and paragraphs in any block of text.
• 🔄XML to JSON Converter Paste any XML document and instantly convert it into clean, pretty-printed JSON. Shows the root element and an approximate node count.
• 🧮Bit Field Packer Calculator Packs up to three integer values into contiguous bit fields and shows the combined result in decimal, hexadecimal, and binary.
• 🔟Sign-Magnitude Converter Convert a signed integer to its sign-magnitude binary representation in a chosen bit width, with the sign bit and magnitude.
• 📦SSCC Check Digit Calculator Calculates the GS1 mod-10 check digit for an 18-digit Serial Shipping Container Code from its 17-digit body.
• 🔤Modular Type Scale Calculator Generate a modular typographic scale of font sizes from a base size and a ratio.
• 🔢Tonelli-Shanks Modular Square Root Calculator Finds the modular square root r such that r² ≡ n (mod p) for a prime modulus p using the Tonelli-Shanks algorithm, checking Euler's criterion first.
• 🚧Redefence Cipher Encoder/Decoder Encodes or decodes text with the Redefence cipher — a keyed rail-fence that writes letters in a zig-zag over N rails, then reads the rows in the order set by a numeric key.
• 🌐CIDR to Netmask Converter Convert a CIDR prefix length to a dotted-decimal subnet mask (or back), with the usable host count and wildcard mask.
• 🔢Adler-32 Checksum Calculator Calculate the Adler-32 checksum of any text, showing the hexadecimal and decimal value plus the A and B running sums.
• 🔢Fixed-Point Q-Format Converter Converts between real numbers and Q-format fixed-point integers, showing the raw value, resolution, and quantization error.
• 🔑Hash Identifier Identifies the likely hash algorithm (MD5, SHA-1, SHA-256, bcrypt and more) from a hash string by its length and character set.
• 🖧IPv4 to Binary Converter Converts an IPv4 address between dotted decimal notation and binary octets in both directions, and shows the 32-bit integer value.
• 📚ISBN-10 to ISBN-13 Converter Convert a 10-digit ISBN to its 13-digit form by adding the 978 prefix and recomputing the EAN-13 check digit. Essential for cataloguing older books under the current standard.
• 🌐Subnet Mask to CIDR Converter Converts a dotted-decimal subnet mask to its CIDR prefix length, and reports usable hosts and the wildcard mask.
• 🎨CSS HSL to Hex Converter Converts a CSS HSL color into its RGB and uppercase hex equivalent for use in stylesheets.
• 🔢CUSIP Validator Validates a 9-character CUSIP security identifier by recomputing its modulus-10 check digit and comparing it to the last character.
• 📝Line Counter Tool Counts the lines, non-empty lines, words and characters in any block of text.
• 🔤UTF-16 Encoder Encodes text into its UTF-16 code units shown in hexadecimal, using surrogate pairs for characters outside the Basic Multilingual Plane.
• 📋Text to ASCII Table Generator Paste comma-separated rows (one per line) and get a clean monospaced ASCII table with +, - and | borders, columns auto-padded to width.
• 📇vCard Builder Build a standard vCard 3.0 (.vcf) contact block from a name, phone, email, and organization.
• 🆔CUIT Validator Validate an Argentine CUIT (Código Único de Identificación Tributaria) using its mod-11 check digit, and identify whether it belongs to a person or a company.
• 🔢ISO 7064 Check Character Calculator Computes the ISO 7064 check character using the MOD 11,10 (numeric) or MOD 37,36 (alphanumeric) algorithm and appends it to the value.
• 🔗JSON to Query String Converter Parses a flat JSON object and builds a URL-encoded query string (k=v&k2=v2) with keys and values percent-encoded.
• 🇨🇱RUT Validator (Chile) Validates a Chilean RUT/RUN by recomputing its modulo-11 check digit and reports whether it matches.
• 🔣Z85 Encoder Encodes text into Z85, the ZeroMQ base-85 format, zero-padding the input to a multiple of 4 bytes.
• 🇳🇱BSN Validator (Netherlands) Validates a Dutch citizen service number (BSN) using the official eleven-test checksum.
• 🔡Hex Dump Calculator Produce a classic hexadecimal dump of any text: 16 bytes per row showing the offset, hex byte values, and an ASCII gutter with non-printable bytes shown as dots.
• 🎨Munsell to RGB Converter Parses Munsell notation (Hue Value/Chroma, e.g. 5R 5/14) and produces an approximate RGB hex via a simplified HSL mapping — not a colorimetric conversion.
• 🔐Myszkowski Transposition Cipher Encrypt or decrypt text with the Myszkowski transposition cipher, where repeated keyword letters share a column number and are read together.
• 🆔ORCID Validator Validate an ORCID identifier using the ISO 7064 MOD 11-2 checksum and see the computed check digit.
• 🚗VIN Check Digit Validator Compute the check digit (9th position) of a 17-character Vehicle Identification Number and validate it.
• 🔍Regex Tester Calculator Tests a regular expression against your sample text and lists every match it finds with a total count.
• 📝Average Word Length Calculator Calculate the average word length of any text by dividing the total letters by the number of words.
• 🔢Base58 Encoder / Decoder Encode text to Base58 or decode Base58 back to text using the Bitcoin alphabet.
• 🎟️Coupon Code Generator Generates a deterministic batch of coupon codes from a text seed using an unambiguous character set, with optional prefix.
• #️⃣Hashtag Counter Scans your text and lists every hashtag, counts how many there are, and shows the longest one.
• 🔌MAC Address Format Converter Reformat a MAC address into colon, hyphen, Cisco dot, or bare notation, and extract its 12-hex form and OUI prefix.
• 🔗Slugify Text Tool Converts any text into a clean URL slug: lowercase, accents stripped, and non-alphanumeric characters replaced with hyphens or underscores.
• 🎨APCA Contrast Calculator Computes the APCA (Accessible Perceptual Contrast Algorithm) Lc contrast value between a text color and a background color.
• 🔣Ascii85 Encoder / Decoder Encode text to Ascii85 (base85) or decode Ascii85 back to text.
• 🌐CIDR to Subnet Mask Calculator Convert a CIDR prefix length (0–32) into its dotted-decimal subnet mask, the matching wildcard mask, and the number of usable host addresses.
• 🆔DNI Validator Validates a Spanish DNI number by computing its control letter from the 8-digit number modulo 23.
• 🧰JSON to TOML Converter Convert a simple JSON object to TOML: strings are quoted, numbers and booleans stay bare, nested objects become [tables] and lists become arrays.
• 🔣BSON Hex Viewer Encode a single-field JSON document (one string or integer value) into its BSON byte layout and view the bytes as annotated hex.
• 📋Form Data to JSON Converter Parses an application/x-www-form-urlencoded query string and converts it into formatted JSON.
• 🔲Grille Cipher Tool Encodes text using a 4×4 Cardan turning grille transposition cipher, filling the grid through four 90° rotations to produce the ciphertext.
• 🔗Query String Parser Parses a URL query string into URL-decoded key/value pairs and flags duplicate parameters.
• ⌨️QWERTY Shift Cipher Encode or decode text by shifting each letter a number of positions along its QWERTY keyboard row, wrapping within the row.
• 🔗Extract URLs from Text Extract all http and https URLs from a block of text, one per line, with a count. Handy for harvesting links from documents, logs and messages. Copy the result with one click.
• 🔐SHA3 Hash Generator Computes the SHA3 cryptographic hash (256, 512, 224 or 384 bit) of any text and returns the hex digest.
• 🎨HSL to OKLCH Converter Converts an HSL color into the perceptually uniform OKLCH color space via the full sRGB to OKLab matrix pipeline.
• 🔖Protocol Buffer Varint Encoder Encodes an unsigned integer into a Protocol Buffers base-128 varint and shows the hex and binary bytes.
• 📍Geo URI Builder Build a standard RFC 5870 geo: URI from latitude and longitude, with optional altitude and accuracy.