Free online tools
Dev Tools
Explore 20 Dev Tools tools and finish common tasks quickly in your browser.
UUID Generator (v4 & v7)
Generate RFC 9562 UUID v4 or time-ordered v7 in bulk with case and format options.
URL Encoder & Decoder
Percent-encode or decode URLs and query parameters with encodeURI or encodeURIComponent.
Taiwan Business ID Validator (統一編號)
Validate 8-digit Taiwan Unified Business Numbers (UBN / 統一編號). Supports the April 2023 modulo-5 rule, legacy modulo-10 rule, special 7th-digit logic, and batch processing.
HTML Entity & Character Coder
Encode/decode HTML entities and copy special characters or emojis from a searchable grid panel.
JS/JSON Minifier & Obfuscator
Compress, beautify, and obfuscate JavaScript/JSON code locally, showing size comparison.
JSON Formatter & Validator
Beautify, minify, validate and debug JSON syntax errors.
Base64 & URL Encoder/Decoder with MD5 & SHA-256 Hash
Encode and decode Base64/URL instantly with MD5 & SHA-256 hash generation.
Regex Tester & Helper
Test regular expressions with real-time highlighting and common syntax presets.
Lorem Ipsum & Mock Data Generator
Generate Lorem Ipsum dummy texts and mock API schema structures to export as JSON.
JWT Decoder & Parser
Decode and inspect JWT JSON structures (Header/Payload/Signature) and view expiration metadata.
SQL Formatter & Beautifier
Format, indent, and beautify SQL queries with case conversion for keywords.
Cron Parser & Generator
Configure Cron schedule visually, parse expressions to readable text, and predict execution times.
User Agent (UA) Parser & Client Info
Inspect your browser, OS, hardware, engine details, or analyze any pasted User Agent.
2.5D Mechanical Keyboard Tester
Test your keyboard layout and keys in browser with a premium 2.5D model, physical sound simulation for Blue/Red/Brown switches, and Alpa fighting keys in boxing gloves!
Beautiful Code Screenshot Generator
Wrap your code snippets into beautiful social-ready images with macOS window mockups, glow shadow, and gradient backplates.
Universal Table & Spreadsheet Converter
Paste copied Excel cells or CSV data to instantly generate Markdown tables, JSON arrays, or HTML tables.
Unix Epoch Timestamp Converter
Display live current epoch timestamp and support dual-directional conversions between timestamps and readable dates.
Lucky Draw & List Randomizer
Paste a list of names to draw winners or randomly shuffle the list. Features neon rolling animations and drumroll sound effects.
Focus Ambient Noise & Lo-Fi Mixer
Customize mixing levels of multiple environmental audio tracks (rain, bonfire, forest birds, screaming llama, Lo-Fi beats) with built-in Pomodoro sleep timer.
cURL Code Converter
Convert cURL commands to JavaScript Fetch, Axios, Python, and Go code instantly for rapid development.
