Category
Developer Tools
Client-side coding utilities for formatting, converting, encoding and inspecting data.
36 toolsJSON Formatter
Beautify, validate and minify JSON with syntax highlighting.
JSON to CSV Converter
Convert JSON arrays into downloadable CSV files.
CSV to JSON Converter
Parse CSV data into structured JSON output.
Base64 Encoder/Decoder
Encode and decode text and files to and from Base64.
URL Encoder/Decoder
Percent-encode and decode URLs and query parameters.
JWT Decoder
Decode a JWT into its header, payload and signature.
Regex Tester
Test regular expressions against sample text with live match highlighting.
Timestamp Converter
Convert Unix epoch timestamps to and from human-readable dates.
UUID Generator
Generate v4 UUIDs singly or in bulk.
Hex to RGB Converter
Convert colors between HEX, RGB and HSL formats.
Cron Expression Generator
Build and explain cron schedules with next-run preview.
HTML Encoder/Decoder
Encode and decode HTML entities in text.
HTML Minifier
Remove whitespace and comments to shrink HTML.
CSS Minifier
Compress CSS by stripping whitespace and comments.
JavaScript Minifier
Minify JavaScript source to reduce file size.
JSON to YAML Converter
Convert between JSON and YAML formats.
SQL Formatter
Beautify and indent SQL queries for readability.
Number Base Converter
Convert numbers between binary, octal, decimal and hex.
QR Code Generator
Generate downloadable QR codes from text or URLs.
CSS Gradient Generator
Visually build linear and radial CSS gradients with code output.
Markdown Preview
Render Markdown to live HTML side by side.
XML Formatter
Beautify and validate XML documents.
JSON Validator
Validate JSON syntax and pinpoint errors.
Slug Generator
Create SEO-friendly URL slugs from text.
ROT13 Encoder/Decoder
Apply the ROT13 letter-substitution cipher to text.
Chmod Calculator
Compute numeric and symbolic Unix file permissions.
User Agent Parser
Parse a user-agent string into browser, OS and device.
.gitignore Generator
Merge multiple language, framework and OS templates into one .gitignore, with duplicate patterns removed.
Regex Explainer
Paste a regular expression and get a plain-English, token-by-token breakdown of what it matches.
Data File Merger
Merge multiple JSON, CSV, TSV or XML files into one combined dataset, exportable as JSON or CSV.
Duplicate File Finder
Find exact duplicate files by content hash locally in your browser, flagging older copies as safe to delete.
Mock Data Generator
Generate fake users or products as JSON or CSV for API testing and demos.
PWA Manifest Generator
Build manifest.json and HTML tags to turn your site into an installable Progressive Web App.
YAML to JSON Converter
Convert YAML to pretty-printed JSON instantly in your browser.
PX to REM Converter
Convert CSS pixels to rem (and back) with a customizable root font size.
JSON Diff Checker
Compare two JSON documents with path-level added, removed, and changed highlights.