Cryptogram Generator creates letter substitution cipher puzzles where each letter is replaced with another letter consistently throughout the text.

CSR Parser extracts and analyzes information from Certificate Signing Requests (CSRs), providing detailed subject information, public key details, and fingerprints.

CSV to JSON Converter is a powerful tool for converting CSV data into JSON format. It supports custom delimiters, header detection, and handles quoted fields properly.

Cuid Generator is a tool for generating collision-resistant unique identifiers (Cuids). Cuids are optimized for horizontal scaling and sequential lookup performance in distributed systems.

Currency Converter is a simple tool for converting currency rates. It returns the converted currency rate based on the amount and currency provided.

Currency Symbols is a simple tool for getting currency symbols. It returns the currency symbol, name, and more of a currency.

Dad Jokes is a simple tool for getting dad jokes. It returns a random dad joke.

DANE Record Validator validates DANE/TLSA DNS records used for certificate authentication, providing security analysis and best practice recommendations.

Data Masking is a powerful tool for detecting and masking sensitive information in text. It can identify and redact emails, phone numbers, SSNs, credit cards, IP addresses, URLs, and dates.

Date Calculator is a simple tool for calculating date differences. It returns the calculated date difference based on the dates provided.

Daylight Duration Calculator computes sunrise, sunset times, and total daylight hours for any geographic location and date using astronomical algorithms.

Dice Roller is a tool for rolling dice using standard RPG notation (XdY format). It supports multiple dice, various die sizes, modifiers, and provides statistics including min, max, average, and theoretical values for gaming and simulations.

Dictionary is a simple tool for getting word definitions. It returns the definition a word.

Did You Mean is a simple tool for correcting spelling mistakes. It returns the corrected text.

Disposable Phone Number Checker is an API that checks whether a given phone number is a known disposable or temporary number. Useful for fraud prevention, user verification, and security.

Distance Calculator is a simple tool for calculating the distance between two locations. It returns the distance in miles and kilometers.

DKIM Validator checks the DomainKeys Identified Mail (DKIM) DNS records for a domain to verify that they are present and correctly formatted.

DMARC Validator checks the Domain-based Message Authentication, Reporting and Conformance (DMARC) record for a domain to ensure it is correctly configured.

D&D Generator creates random content for tabletop role-playing games including characters, NPCs, monsters, treasure, encounters, taverns, and quests.

DNS Lookup is a simple tool for looking up the DNS records of a domain. It returns the A, MX, and other records of the domain.