Arsenal Tools
One hub for practical online tools
Fast, simple, and free. Open a tool and start immediately without signup.
Categories
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Text Tools (6)
Text processing, counting, conversion, and analysis
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Calculators (5)
Math and everyday calculations
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Converters (4)
Unit and format converters
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Developer Tools (7)
Tools for developers and engineers
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CSS Generators (2)
Generate and preview CSS code visually
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Color Tools (1)
Color conversion and picking
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Image Tools (3)
Image compression and resizing
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Security (2)
Password generation and security utilities
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Utilities (2)
General purpose tools
Tools
Available tools in the current release.
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Text Word Counter
Count words, characters, sentences, and paragraphs instantly in your text.
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Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, or Sentence case in one click.
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Remove Duplicate Lines
Remove repeated lines and keep unique lines in your text with one click.
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Text to URL Slug
Convert any text into a clean, URL-friendly slug for pages and posts.
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Lorem Ipsum Generator
Generate lorem ipsum paragraphs quickly for mockups and draft layouts.
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Text Diff Checker
Compare two text blocks and quickly find lines that were added or removed.
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Percentage Calculator
Calculate percentage values, increase/decrease rates, and percentage of numbers.
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Tip Calculator
Calculate tip amount and total bill, then split across multiple people.
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BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units.
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Age Calculator
Calculate exact age in years, months, and days from your birth date.
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Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 back to readable text.
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URL Encoder / Decoder
Encode URL components safely and decode encoded URL strings instantly.
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Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin.
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Number Base Converter
Convert numbers between binary, decimal, and hexadecimal formats.
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UUID Generator
Generate random UUID v4 identifiers for apps, APIs, and databases.
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Unix Timestamp Converter
Convert Unix timestamps to readable dates and dates back to Unix time.
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JSON Formatter & Validator
Format and validate JSON with readable indentation and clear parse errors.
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HTML Entity Encoder / Decoder
Encode special HTML characters into entities or decode entities back to text.
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Hash Generator (SHA-256 / SHA-1)
Generate common text hashes including SHA-256 and SHA-1.
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Password Generator
Create secure random passwords with customizable length and character sets.
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Regex Tester
Test regular expressions with flags and inspect all matches with capture groups.
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JWT Decoder
Decode JWT header and payload instantly in your browser without sending data to a server.
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CSS Gradient Generator
Create linear gradients visually and copy production-ready CSS code.
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CSS Box Shadow Generator
Build and preview CSS box shadows with offset, blur, spread, and color controls.
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Color Code Converter
Convert and synchronize HEX, RGB, and HSL color values instantly.
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Image Compressor
Compress images in the browser by adjusting output quality and format.
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Image Resizer
Resize images with width and height controls while keeping aspect ratio.
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Image Format Converter
Convert between major image formats, including HEIC input and AVIF/SVG support.
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QR Code Generator
Generate QR codes from text or URLs and download them as PNG images.
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RAID Calculator
Estimate usable capacity, fault tolerance, and rough throughput for RAID setups.
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Stable Diffusion Prompt Generator
Generate base prompt and negative prompt templates for Stable Diffusion.
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URL Security Checker
Run basic URL risk heuristics like HTTPS, obfuscation signs, and host checks.
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Guides
Guides →In-depth guides on how to use our tools and the concepts behind them.
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RAID Level Comparison Guide
Choosing the right RAID level is a balance between capacity efficiency, fault tolerance, performance, and cost. This guide walks through the practical differences between the most common RAID levels and ZFS equivalents, so you can pick the right configuration for your workload before committing to hardware. Pair this guide with our RAID Calculator to model exact usable capacity and parity overhead for the disk count you have on hand.
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URL Safety Check Guide
Phishing and malicious URLs remain one of the most common attack vectors on the modern web. Attackers are increasingly sophisticated, using lookalike domains, homograph attacks, and legitimate-looking redirects to trick even careful users. This guide walks through a practical first-pass review process you can apply to any suspicious URL — whether it arrived via email, chat, social media, or a search result — so you can make an informed decision before clicking.
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Base64 Encoding Explained
Base64 is one of the most common encoding schemes in modern software, yet it is also one of the most misunderstood. Developers frequently misuse it as a form of obfuscation, conflate it with encryption, or apply it where it adds unnecessary overhead. This guide explains what Base64 is, why it exists, where it shines, and where it does not belong — so you can use it appropriately in your own code.
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Hash Functions Explained
Hash functions are fundamental building blocks of modern computing, used for everything from file integrity to digital signatures to password storage. They are also a common source of confusion: developers reach for MD5 when they should use SHA-256, use a fast hash for passwords, or expect hashes to be reversible. This guide untangles what hash functions are, how SHA-256 and SHA-1 compare, why MD5 is no longer safe, and the special rules for password hashing.
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