Developer Calculators & Tools

Free client-side developer utilities for JSON formatting, Base64 encoding/decoding, JWT inspection, Unix timestamps, and regex testing.

Popular Tools in Developer

JSON Formatter - Pretty-print, minify and validate JSON.
Base64 Encoder/Decoder - Encode text to Base64 or decode it back.
Color Picker - Pick a color and read off HEX, RGB and HSL instantly.
Regex Tester - Test a regular expression against sample text with live match highlighting.
HTML Formatter - Indent and clean up messy HTML markup.
SQL Formatter - Readable indentation for SQL queries.
CSS Minifier - Strip whitespace and comments from CSS to shrink file size.
JS Minifier - Compress JavaScript by removing whitespace and comments.
Markdown Previewer - Live-render Markdown to HTML side by side.
URL Encoder/Decoder - Percent-encode or decode a URL or query string.
HTML Entity Encoder/Decoder - Convert special characters to and from HTML entities.
JWT Decoder - Decode a JWT's header and payload without verifying signature server-side.
Unix Timestamp Converter - Convert between Unix timestamps and human-readable dates.
Text Diff Checker - Compare two blocks of text and highlight the differences.
CSS Gradient Generator - Build a linear or radial gradient and copy the CSS.
CSS Box Shadow Generator - Design a box-shadow visually and copy the CSS.
Lorem Ipsum Generator - Placeholder text by paragraph, sentence or word count.
Binary / Hex / Octal Converter - Convert numbers between binary, decimal, hex and octal.
PX to REM Converter - Convert pixel values to REM/EM units for responsive CSS.
URL Slug Generator - Convert plain text strings into clean, SEO-friendly URL slugs.
Crypto Hash Generator (SHA-256 / SHA-512) - Generate SHA-256, SHA-512, and SHA-1 cryptographic text hashes 100% locally in browser.
Linux Chmod Permissions Calculator - Calculate octal (755, 644) and symbolic (rwxr-xr-x) Linux file permissions with visual toggles.
PX to VW / VH Converter - Convert pixel values to viewport width (vw) and viewport height (vh) units for CSS layouts.
WCAG Color Contrast Ratio Checker - Check WCAG 2.1 AA/AAA accessibility contrast ratios between text and background colors.