Online Tools

A collection of free online tools for developers

Press "/" to focus

Cryptography

Bcrypt Tool

Professional Bcrypt password encryption tool with customizable work factor. Generate and verify password hashes securely. Free online password encryption service.

Hash Generator

Professional online hash generator supporting MD5, SHA1, SHA256, SHA512, and more algorithms. Quickly calculate hash values for text and files with hash comparison feature.

HMAC Generator

Professional HMAC generator tool supporting MD5, SHA1, SHA256, SHA512, and more algorithms. Secure message integrity verification service.

RSA Key Pair Generator

Professional RSA key pair generator with multiple key sizes and passphrase protection. Secure key generation service for encryption and digital signatures.

Token Generator

Professional random token generator with customizable length and character types, supports batch generation. Secure token generation service for API keys, security tokens, and more.

Text Encryption/Decryption

Professional text encryption and decryption tool supporting AES, CBC, GCM and more algorithms with multiple output formats. Secure online encryption service to protect your sensitive data.

UUID Generator

Professional UUID generator supporting v1/v3/v4/v5 versions with namespace and custom options. Secure and reliable unique identifier generation service.

ULID Generator

Professional ULID (Universally Unique Lexicographically Sortable Identifier) generator with batch generation support. Provides timestamp parsing and multiple format conversions.

BIP39 Mnemonic Generator

Generate and verify BIP39 mnemonic phrases with multiple languages and passphrase support

Password Strength Analyzer

Professional password strength analysis tool that checks password complexity, evaluates crack difficulty, and provides security recommendations. Supports checking password length, special characters, case sensitivity, and multiple security factors.

PDF Signature Checker

Professional PDF document digital signature verification tool, supporting multiple signature checks, providing detailed signature information and certificate chain verification. Secure and reliable online signature verification service.

OTP Generator

Generate Time-based One-Time Passwords (TOTP) and HMAC-based One-Time Passwords (HOTP) online, compatible with Google Authenticator

Basic Auth Generator

Generate HTTP Basic Authentication headers and command line tool commands for cURL, HTTPie, and Wget

JWT Decoder

Decode and parse JWT tokens online, view header, payload and signature

Network Tools

IPv4 Subnet Calculator

Calculate network address, broadcast address, usable hosts and more for IPv4 subnets

IPv4 Address Converter

Online tool to convert between IPv4 addresses, decimal, binary, and hexadecimal formats

IPv4 Range Expander

Convert IPv4 address ranges to the best matching CIDR notation, calculate network and broadcast addresses

MAC Address Lookup

Look up vendor and manufacturer information for any MAC address

MAC Address Generator

Generate random MAC addresses with custom prefix, case, and separator options

IPv6 ULA Generator

Generate local non-routable IPv6 ULA addresses according to RFC4193

IPv6 Subnet Calculator

Calculate IPv6 subnet information including network address, broadcast address, and usable address range

Network Unit Converter

Convert between different network units, supporting both speed and data units with binary and decimal calculations

IPv6 Address Converter

Convert IPv6 addresses between different formats, supporting standard, binary, and hexadecimal

VLSM Calculator

Calculate Variable Length Subnet Masks (VLSM) to divide networks based on host requirements

CIDR Aggregator

Calculate optimal route aggregation for multiple IP ranges or CIDR blocks, check overlaps and conflicts

ACL Generator

Generate ACL (Access Control List) configurations for Cisco and Huawei network devices. Support both standard and extended ACL with common templates.

VLAN Calculator

Calculate VLAN ranges and associated subnet information for network planning.

VLAN Generator

Generate VLAN configurations for Cisco and Huawei switches. Support both access and trunk ports with common templates.

Total Tools
100
Categories
9
Open Source
GitHub