Utill.net
Free online utilities for encoding, encryption, formatting, and more.
Encode & Decode
Base64 Encode/Decode
Encode text to Base64 or decode Base64 strings back to plain text. Ideal for data URIs, API payloads, and email attachments.
Unicode Encode/Decode
Convert text to Unicode escape sequences (\uXXXX) or decode them back. Useful for handling special characters in code and config files.
URL Encode/Decode
Encode special characters in URLs with percent-encoding or decode them back. Essential for query strings, API requests, and safe links.
JWT Decoder
Paste a JWT to instantly decode and inspect its header, payload, and signature. Debug authentication tokens without server-side processing.
Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) with real-time updates.
HTML Entity Converter
Convert special characters to HTML entities (e.g. & → &) or decode them back. Prevents XSS and ensures safe web rendering.
Backslash Escape
Escape special characters with backslashes or unescape backslash sequences. Handy for JSON strings, regex patterns, and code literals.
Security
AES Encryption
Encrypt and decrypt text using the AES algorithm with a custom secret key. All processing happens locally in your browser.
What Is My IP
Instantly display your current public IP address and network information.
Password Generator
Generate strong, random passwords with customizable length, character sets, and complexity rules. Uses cryptographic randomness.
IP Subnet Calculator
Calculate network address, broadcast address, host range, and subnet mask from IPv4 CIDR notation at a glance.
Generators
UUID Generator
Generate one or more UUID v4 identifiers instantly. Perfect for database primary keys, unique file names, and distributed systems.
Hash Generator
Compute MD5, SHA-1, SHA-256, SHA-512, and other cryptographic hashes from text input. All hashing is done locally in the browser.
QR Code Generator
Create QR codes from URLs, text, or any data. Customize size and download the image for print or digital use.
IndexNow Key Generator
Generate a valid IndexNow API key to notify search engines like Bing and Yandex about new or updated content on your site.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text in paragraphs, sentences, or words. Ideal for wireframes, mockups, and layout testing.
URL Slug Generator
Turn any text into a clean, URL-friendly slug. Customize separators, handle Unicode characters, and preview in real time.
Formatters
JSON Formatter
Format messy JSON into readable, indented output or minify it into a compact form. Supports adjustable indentation and syntax validation.
Diff Checker
Compare two blocks of text side-by-side and highlight added, removed, and changed lines with color-coded diffs.
Text Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, UPPER CASE, lower case, Title Case, and more.
YAML / JSON Converter
Convert YAML to JSON or JSON to YAML instantly. Useful for switching between configuration file formats and API payloads.
SQL Formatter
Format and beautify SQL queries with support for multiple dialects (MySQL, PostgreSQL, SQLite, etc.). Improve readability instantly.
Converters
Unix Timestamp Converter
Convert Unix timestamps (seconds/milliseconds) to human-readable dates and vice versa. Supports multiple date formats and time zones.
Cron Expression Parser
Parse and validate cron expressions into plain-language schedules. See upcoming run times and build expressions interactively.
CSS Unit Converter
Convert between CSS units — px, rem, em, vw, vh, and pt — with a configurable base font size. Handy for responsive design.
Image to Base64
Upload an image and convert it to a Base64 data URI for embedding directly in HTML, CSS, or JavaScript without extra HTTP requests.
Aspect Ratio Calculator
Calculate and maintain aspect ratios when resizing images or videos. Enter width or height to get the proportional counterpart.
Visualizers
AI Tools
Token Calculator
Count tokens for OpenAI GPT models (GPT-4, GPT-3.5, etc.) and estimate API costs based on input and output token counts.
Regex Tester
Write and test regular expressions with real-time match highlighting, capture groups, and flag support. Includes a quick reference.
String Counter
Analyze text by counting characters, words, lines, sentences, paragraphs, and byte size. Useful for content writing and data validation.