Armytool blog
In-depth guides on security, web development, DevOps and data formats.
All tools
- Ascii text drawer - Ascii text drawer - free online tool.
- Base64 file converter - Convert a string, file, or image into its base64 representation.
- Base64 string encoder/decoder - Simply encode and decode strings into their base64 representation.
- Basic auth generator - Generate a base64 basic auth header from a username and password.
- Bcrypt - Hash and compare text string using bcrypt. Bcrypt is a password-hashing function based on the Blowfish cipher.
- Benchmark builder - Easily compare execution time of tasks with this very simple online benchmark builder.
- BIP39 passphrase generator - Generate a BIP39 passphrase from an existing or random mnemonic, or get the mnemonic from the passphrase.
- Camera recorder - Take a picture or record a video from your webcam or camera.
- Case converter - Transform the case of a string and choose between different formats
- Chmod calculator - Compute your chmod permissions and commands with this online chmod calculator.
- Chronometer - Monitor the duration of a thing. Basically a chronometer with simple chronometer features.
- Color converter - Convert color between the different formats (hex, rgb, hsl and css name)
- Crontab generator - Validate and generate crontab and get the human-readable description of the cron schedule.
- Date-time converter - Convert date and time into the various different formats
- Device information - Get information about your current device (screen size, pixel-ratio, user agent, ...)
- Docker run to Docker compose converter - Transforms "docker run" commands into docker-compose files!
- Email normalizer - Email normalizer - free online tool.
- Emoji picker - Copy and paste emojis easily and get the unicode and code points value of each emoji.
- Encode/decode URL-formatted strings - Encode text to URL-encoded format (also known as "percent-encoded"), or decode from it.
- Encrypt / decrypt text - Encrypt clear text and decrypt ciphertext using crypto algorithms like AES, TripleDES, Rabbit or RC4.
- Escape HTML entities - Escape or unescape HTML entities (replace characters like <,>, &, " and \' with their HTML version)
- ETA calculator - An ETA (Estimated Time of Arrival) calculator to determine the approximate end time of a task, for example, the end time and duration of a file download.
- Git cheatsheet - Git is a decentralized version management software. With this cheatsheet, you will have quick access to the most common git commands.
- Hash text - Hash a text string using the function you need : MD5, SHA1, SHA256, SHA224, SHA512, SHA384, SHA3 or RIPEMD160
- Hmac generator - Computes a hash-based message authentication code (HMAC) using a secret key and your favorite hashing function.
- HTML WYSIWYG editor - Online, feature-rich WYSIWYG HTML editor which generates the source code of the content immediately.
- HTTP status codes - The list of all HTTP status codes, their name, and their meaning.
- IBAN validator and parser - Validate and parse IBAN numbers. Check if an IBAN is valid and get the country, BBAN, if it is a QR-IBAN and the IBAN friendly format.
- Integer base converter - Convert a number between different bases (decimal, hexadecimal, binary, octal, base64, ...)
- IPv4 address converter - Convert an IP address into decimal, binary, hexadecimal, or even an IPv6 representation of it.
- IPv4 range expander - Given a start and an end IPv4 address, this tool calculates a valid IPv4 subnet along with its CIDR notation.
- IPv4 subnet calculator - Parse your IPv4 CIDR blocks and get all the info you need about your subnet.
- IPv6 ULA generator - Generate your own local, non-routable IP addresses for your network according to RFC4193.
- JSON diff - Compare two JSON objects and get the differences between them.
- JSON minify - Minify and compress your JSON by removing unnecessary whitespace.
- JSON prettify and format - Prettify your JSON string into a friendly, human-readable format.
- JSON to CSV - Convert JSON to CSV with automatic header detection.
- JSON to TOML - Parse and convert JSON to TOML.
- Json to xml - Json to xml - free online tool.
- JSON to YAML converter - Simply convert JSON to YAML with this online live converter.
- JWT parser - Parse and decode your JSON Web Token (jwt) and display its content.
- Keycode info - Find the javascript keycode, code, location and modifiers of any pressed key.
- List converter - This tool can process column-based data and apply various changes (transpose, add prefix and suffix, reverse list, sort list, lowercase values, truncate values) to each row.
- Lorem ipsum generator - Lorem ipsum is a placeholder text commonly used to demonstrate the visual form of a document or a typeface without relying on meaningful content
- MAC address generator - Enter the quantity and prefix. MAC addresses will be generated in your chosen case (uppercase or lowercase)
- MAC address lookup - Find the vendor and manufacturer of a device by its MAC address.
- Markdown to html - Markdown to html - free online tool.
- Math evaluator - A calculator for evaluating mathematical expressions. You can use functions like sqrt, cos, sin, abs, etc.
- MIME types - Convert MIME types to file extensions and vice-versa.
- Numeronym generator - A numeronym is a word where a number is used to form an abbreviation. For example, "i18n" is a numeronym of "internationalization" where 18 stands for the number of letters between the first i and the last n in the word.
- Open graph meta generator - Generate open-graph and socials HTML meta tags for your website.
- OTP code generator - Generate and validate time-based OTP (one time password) for multi-factor authentication.
- Password strength analyser - Discover the strength of your password with this client-side-only password strength analyser and crack time estimation tool.
- PDF signature checker - Verify the signatures of a PDF file. A signed PDF file contains one or more signatures that may be used to determine whether the contents of the file have been altered since the file was signed.
- Percentage calculator - Easily calculate percentages from a value to another value, or from a percentage to a value.
- Phone parser and formatter - Parse, validate and format phone numbers. Get information about the phone number, like the country code, type, etc.
- QR Code generator - Generate and download a QR code for a URL (or just plain text), and customize the background and foreground colors.
- Random port generator - Generate random port numbers outside of the range of "known" ports (0-1023).
- Regex memo - Regex memo - free online tool.
- Regex tester - Regex tester - free online tool.
- Roman numeral converter - Convert Roman numerals to numbers and convert numbers to Roman numerals.
- RSA key pair generator - Generate a new random RSA private and public pem certificate key pair.
- Safelink decoder - Safelink decoder - free online tool.
- Slugify string - Make a string url, filename and id safe.
- SQL prettify and format - Format and prettify your SQL queries online (it supports various SQL dialects).
- String obfuscator - Obfuscate a string (like a secret, an IBAN, or a token) to make it shareable and identifiable without revealing its content.
- SVG placeholder generator - Generate svg images to use as a placeholder in your applications.
- Temperature converter - Degrees temperature conversions for Kelvin, Celsius, Fahrenheit, Rankine, Delisle, Newton, Réaumur, and Rømer.
- Text diff - Compare two texts and see the differences between them.
- Text statistics - Get information about a text, the number of characters, the number of words, its size in bytes, ...
- Text to ASCII binary - Convert text to its ASCII binary representation and vice-versa.
- Text to NATO alphabet - Transform text into the NATO phonetic alphabet for oral transmission.
- Text to Unicode - Parse and convert text to unicode and vice-versa
- Token generator - Generate random string with the chars you want, uppercase or lowercase letters, numbers and/or symbols.
- TOML to JSON - Parse and convert TOML to JSON.
- TOML to YAML - Parse and convert TOML to YAML.
- ULID generator - Generate random Universally Unique Lexicographically Sortable Identifier (ULID).
- URL parser - Parse a URL into its separate constituent parts (protocol, origin, params, port, username-password, ...)
- User-agent parser - Detect and parse Browser, Engine, OS, CPU, and Device type/model from an user-agent string.
- UUIDs generator - A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. The number of possible UUIDs is 16^32, which is 2^128 or about 3.4x10^38 (which is a lot!).
- WiFi QR Code generator - Generate and download QR codes for quick connections to WiFi networks.
- XML formatter - Prettify your XML string into a friendly, human-readable format.
- Xml to json - Xml to json - free online tool.
- YAML prettify and format - Prettify your YAML string into a friendly, human-readable format.
- YAML to JSON converter - Simply convert YAML to JSON with this online live converter.
- YAML to TOML - Parse and convert YAML to TOML.
Guides and articles
- 10 Essential Productivity Tools Every Modern Developer Needs in 2026 - Optimize your workflow with our top 10 picks for essential, privacy-focused developer utilities.
- Mastering Web Security: A Developer's Guide to Bcrypt, JWT, and OTP - Learn how to protect user data using industry-standard hashing, authentication, and 2FA techniques.
- The Art of Clean Data: Mastering JSON, XML, and SQL Formatting - Best practices for handling the most common data formats in web development to improve readability and debugging.
- Navigating the Network: A Deep Dive into IP Subnetting and MAC Addresses - Understand the core concepts of networking, from CIDR notation to MAC address OUI lookups.
- Frontend Excellence: Leveraging SVG and Color Tools for Perfect UI - Advanced techniques for using SVGs, color spaces, and content placeholders to build polished interfaces.
- Mastering UUIDs: A Comprehensive Guide to Globally Unique Identifiers - Everything you need to know about UUID versions, use cases, and best practices for unique identification.
- The Ultimate Guide to QR Codes: How to Create and Use Them Effectively - Learn how QR codes work, their common use cases, and how to create high-quality codes for your needs.
- Understanding Base64: How to Encode Files and Images for the Web - A deep dive into Base64 encoding, its use cases in web development, and how to convert files easily.
- Mastering Cron Jobs: A Guide to Scheduling Tasks with Crontab - Demystifying crontab syntax and learning how to automate server tasks with cron jobs.
- Understanding Linux Permissions: A Guide to Chmod and File Security - Master file permissions in Linux and learn how to use chmod to secure your system.
- Security Deep Dive: Mastering JWT, Bcrypt, and OTP for Secure Applications - Learn how to implement robust security in your applications using JWT parsing, Bcrypt hashing, and OTP generation.
- The Architect's Guide to Data Transformation: JSON, YAML, TOML, and XML - A comprehensive guide to converting and formatting various data structures for modern web development.
- Networking Essentials: Understanding IP Subnetting, MAC Addresses, and URL Parsing - Master the core concepts of networking tools, from subnet calculations to MAC address lookups.
- Boosting Developer Productivity with Docker, Git, and Regex Tools - Optimize your workflow with essential tools for Docker configuration, Git management, and Regex testing.
- Typography and Content: From ASCII Art to Text Statistics and Lorem Ipsum - Exploring the creative and analytical sides of text management in web design.
- Mathematical Precision in Web Development: Math Evaluators and Unit Converters - How to handle complex calculations and unit conversions accurately in your web projects.
- SEO and Meta Tags: How to Optimize Your Web Presence Automatically - Practical tips for using meta tag generators and slugify tools to improve your search engine rankings.
- The Anatomy of a Perfect Password: Strength Analysis and Key Generation - Everything you need to know about creating and validating secure passwords and cryptographic keys.
- Modern Web Standards: HTTP Status Codes, MIME Types, and User Agents - A deep dive into the fundamental standards that power the modern web.
- Global Finance and Communication: IBAN Validation and Phone Formatting - Handling international data formats for banking and telecommunications with ease.
- Frontend Utility Masterclass: From SVG Placeholders to Camera Recording - Advanced frontend techniques for dynamic UI components and media handling.
- Modern Encryption Standards for Developers: A Comprehensive Guide to Data Security - In an era of escalating data breaches and sophisticated adversarial attacks, encryption is no longer a "nice-to-have" feature—it is a fundamental requirement of…
- Containerization Strategies: Docker Best Practices for Production - Docker has fundamentally changed how we package and deploy applications. However, there is a massive gap between a "working Dockerfile" and a "production-ready image."…
- Infrastructure as Code (IaC) Fundamentals: Terraform vs. Ansible - The days of manually configuring servers via SSH and a series of "hope-it-works" bash scripts are over. In modern cloud engineering, the infrastructure is the code.…
- JWT Security: Common Pitfalls and Best Practices - JSON Web Tokens (JWT) have become the industry standard for stateless authentication and authorization. By encapsulating claims in a cryptographically signed token, JWTs…
- Mastering CSS Grid and Flexbox for Complex Layouts - For years, web developers struggled with floats and table-based layouts to create multi-column designs. The introduction of Flexbox and CSS Grid revolutionized how we…
- Mastering JSON: Efficient Data Management in Web Apps - In the modern web ecosystem, data is the lifeblood of every application. Whether you are building a lightweight React component or a complex microservices architecture,…
- Modern Frontend Performance Optimization: Beyond the Basics - In the current era of "heavy" web applications, performance is no longer just about minimizing the number of HTTP requests or compressing images. It is about Perceived…
- Monitoring and Observability: Setting up a Health Dashboard - In a complex system, "it\
- The Definitive Guide to Password Hashing - In the modern landscape of cybersecurity, the question is not if a database will be breached, but when. When an attacker gains access to a user table, the only line of…
- Implementing a Robust CI/CD Pipeline for Modern Web Apps - Continuous Integration (CI) and Continuous Deployment (CD) are often spoken of as a single entity, but they represent two distinct phases of the software delivery…
- The Evolution of State Management in Vue 3: From Vuex to Pinia - State management is the heart of any complex frontend application. It is the mechanism that ensures data remains consistent as a user navigates through different views,…