Developer Tools & Online Utilities
Fast, free utilities for developers and power users. Every tool runs entirely in your browser, so nothing you paste ever leaves your device.
Encoders & Converters
Base64 Encoder / Decoder
Encode or decode Base64 text instantly, with live character-by-character feedback.
URL Encoder / Decoder
Percent-encode or decode any URL or query string, safely and losslessly.
Text Case Converter
Switch between UPPERCASE, lowercase, Title Case, camelCase, and more in one click.
Data & Formatting
JSON Formatter
Beautify, minify, and validate JSON with clear error messages and syntax highlighting.
CSS Gradient Generator
Build linear or radial gradients visually and copy clean CSS code in one click.
Favicon Generator
Design a letter favicon with your own colours and shape, then copy the SVG and the ready-to-paste <link> tags.
UUID Generator
Generate v4 UUIDs in bulk with options for uppercase, hyphens, and version selection.
Word Counter
Count words, characters, sentences, and reading time as you type.
Diff Checker
Compare two texts and highlight added, removed and changed lines, with word-level detail.
Lorem Ipsum Generator
Generate placeholder paragraphs, words, or bytes for mockups and layouts.
Networking
IPv4 Subnet Calculator
Get the network, broadcast, mask, and usable host range for any CIDR block instantly.
Scheduling & Automation
Cron Expression Generator
Build a crontab line from the five fields, read it back in plain English, and see the next five run times.
Unix Timestamp Converter (Epoch to Date)
Turn epoch seconds or milliseconds into a readable date and back, with UTC and local time side by side.
Security
JWT Decoder (Decode Header and Payload)
Read a JSON Web Token's header, payload and expiry in plain JSON, and optionally verify the signature with a secret or a public key.
Hash and Checksum Generator (MD5, SHA-256)
Get MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests for any text or file, and check them against an expected checksum.
Password Generator
Create strong, random passwords with adjustable length and character sets.
Percentage Calculator
Percentage of a number, X as a percent of Y, and percentage change in one tool.
Read
Base64 Explained: What It Is and Why It Matters
A plain-language tour of Base64 encoding, padding, and everyday use cases.
JSON Formatting Guide: A Practical Reference
How to read, write, and debug JSON with confidence.
URL Encoding Explained: Percent Signs and Beyond
Why special characters need percent-encoding and how it works.
CSS Gradients Guide: Linear and Radial in Practice
Build and combine CSS gradients with real examples.
UUID Explained: What They Are and How They Work
Versions, randomness, and when to use UUIDs in your database.
Word Count Guide: Why It Matters and How to Use It
Word counts for SEO, school, and professional writing.
Lorem Ipsum Explained: Where It Comes From
The history and correct use of placeholder text.
Strong Passwords: A Practical Guide
How to create and manage passwords that survive real-world attacks.
IPv4 Subnetting Explained: Masks, CIDR, and Host Ranges
What subnet masks and CIDR notation mean, with a subnet-sizes table and real network examples.