Developer & Text Tools
Developer and text tools: encode and decode Base64 or URLs, format JSON, generate hashes and UUIDs, convert number bases and count words or characters. Everything runs on the input you paste, with output ready to copy.
239 tools · page 1 of 4
- EAN-13 Barcode Check Digit Calculator Validate a 13-digit EAN-13/UPC barcode or compute the check digit from the first 12 digits.
- Caesar Cipher Encrypt text with the Caesar cipher (letter shift); use a negative shift to decrypt.
- Baconian Cipher Encrypt or decrypt text with Bacon's cipher, encoding each letter as a 5-symbol a/b code.
- A1Z26 Cipher (Letter ↔ Number) Convert letters to their alphabet positions (A=1…Z=26) and back with the A1Z26 cipher.
- Character / Word Counter Count the characters (with/without spaces), words, lines and sentences in any text.
- ABA Routing Number Validator Validates a 9-digit ABA routing number using the official checksum formula and reports whether it is structurally valid.
- IBAN Validator Validate an IBAN by checking its country length and the mod-97 check digits.
- Kelvin to RGB Converter Converts a Kelvin color temperature into an approximate RGB and hex value using the Tanner Helland model.
- Credit Card Validator (Luhn) Check a card number against the Luhn algorithm and detect the card type (Visa, Mastercard, Amex, Troy and more).
- Reverse Text Tool Reverse the characters of any text string.
- Hex ↔ Text Converter Convert text into a hexadecimal byte string or decode hex back into text.
- NPI Validator Validate a 10-digit US National Provider Identifier (NPI) using its Luhn check digit.
- Text to ASCII / Unicode Codes Show the character code of each character in your text.
- Unicode Character Lookup Enter any character to instantly see its Unicode code point (U+ notation), decimal value, UTF-8 byte sequence, and HTML numeric entity. Works for letters, symbols, and emoji.
- Number Lines Tool Add sequential line numbers to each line of text.
- Download Time Calculator Calculate how long a download will take from the file size and your connection speed.
- Morse Code Translator Encode text to Morse code or decode Morse code back into text.
- Repeat Text Tool Repeat a piece of text a given number of times.
- Vigenère Cipher Encoder/Decoder Encrypt or decrypt text with the Vigenère cipher using a keyword.
- Fullwidth (Vaporwave) Text Converter Convert normal text to fullwidth Unicode characters for that aesthetic vaporwave look.
- Hash Generator — MD5, SHA Compute the MD5, SHA-1 and SHA-256 hashes of any text.
- JSON Formatter / Minifier Format a JSON string into readable, indented form or minify it to one line; invalid JSON is flagged.
- PPI (Pixel Density) Calculator Calculate PPI (pixels per inch), dot pitch and total megapixels from the resolution and screen diagonal.
- Binary ↔ Text Converter Convert text into 8-bit binary or decode binary back into text.
- CIDR / Subnet Calculator Calculate the subnet mask, host count and address range from an IP and prefix.
- Hamming Distance Calculator Calculate the Hamming distance between two strings.
- HTML Encode / Decode Encode text into HTML entities or decode HTML entities back into text.
- IMEI Validator Validate a 15-digit phone IMEI using the Luhn checksum and compute its check digit.
- UUID / GUID Generator Generate one or more random UUIDs (version 4 / GUID).
- VIN Validator Validate a 17-character Vehicle Identification Number using its ISO 3779 check digit.
- Base64 Encode / Decode Encode any text to Base64 or decode a Base64 string back to text.
- Remove Duplicate Lines Remove duplicate lines from text, keeping the first occurrence and original order.
- Subnet Count Calculator Calculate how many smaller subnets fit in a larger CIDR block and the hosts per subnet.
- Base32 Encode / Decode Encode any text to Base32 or decode a Base32 string back to text.
- RAID Capacity Calculator Calculate usable storage capacity for RAID 0, 5, 6 and 10 from disk count and disk size.
- Atbash Cipher Encode or decode text with the Atbash cipher, which mirrors each letter (A↔Z).
- HMAC Generator Generate an HMAC (HMAC-SHA256, SHA1, MD5 or SHA512) from text and a secret key.
- Polybius Square Cipher Encrypt or decrypt text with the Polybius square, mapping letters to row/column digit pairs.
- ROT13 Cipher Transform text with ROT13 (the same operation both encodes and decodes).
- Slug Generator Convert a title into a lowercase, hyphenated, URL-friendly slug (Turkish characters simplified).
- Data Transfer Time Calculator Calculate how long it takes to transfer a file from its size and the connection speed.
- ISSN Validator Validate an 8-character ISSN using its mod-11 check digit (X allowed).
- ROT47 Cipher Encode or decode text with ROT47, rotating printable ASCII characters by 47 (self-inverse).
- Scytale Cipher Encrypt or decrypt text with the Scytale, an ancient columnar transposition cipher.
- Case Converter Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and kebab-case.
- CRC32 & Checksum Calculator Compute the CRC-32, CRC-32B and Adler-32 checksums of any text.
- IP Subnet Calculator Calculate the subnet mask, wildcard, total addresses and usable hosts from a CIDR prefix.
- JWT Decoder Decode the header and payload of a JWT (JSON Web Token) without verifying its signature.
- Lorem Ipsum Generator Generate Lorem Ipsum placeholder text with the number of paragraphs you choose.
- PX to REM Converter Convert pixels to rem (at a base font size) and points for CSS.
- ISIN Validator Validate a 12-character ISIN (International Securities Identification Number) check digit.
- Quoted-Printable Encoder / Decoder Encode text to MIME Quoted-Printable or decode Quoted-Printable back to text.
- Color Contrast Ratio Calculator Calculate the WCAG contrast ratio between two hex colors and whether it passes AA/AAA.
- Beaufort Cipher Encrypt or decrypt text with the Beaufort cipher; the same operation reverses it.
- Subnet Calculator Calculate the netmask, network address, broadcast address and usable hosts for an IPv4 subnet.
- GTIN-8 / EAN-8 Check Digit Calculator Validate an 8-digit GTIN-8/EAN-8 barcode or compute the check digit from 7 digits.
- Password Generator Generate a strong, random password for your chosen length and character set.
- Find and Replace Tool Find and replace all occurrences of text and count the replacements.
- URL Encode / Decode Percent-encode text for safe use in URLs, or decode an encoded string back.
- Color Converter (HEX → RGB / HSL) Convert a HEX color code (e.g. #1e6bff) into RGB and HSL values.