Free Online Developer Tools
Fast, private, and free. Every tool runs entirely in your browser — nothing is sent to a server.
JSON Formatter & Validator
Paste JSON to format, validate, and minify. Instant syntax highlighting and error detection.
Base64 Encoder / Decoder
Encode or decode text and files to and from Base64. Supports UTF-8 and binary files.
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes from any text input using the Web Crypto API.
JWT Decoder
Paste a JSON Web Token to decode and inspect the header, payload, and signature.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
SOL / USD Calculator
Convert between Solana (SOL) and USD with live prices from CoinGecko.
Solana Token Lookup
Look up any Solana token by mint address. See name, symbol, supply, price, and more.
Solana Wallet Checker
Check any Solana wallet balance, token holdings, and recent transactions.
Token Safety Scanner
Scan any Solana token for rug pull risks. Checks mint authority, freeze authority, top holders, and more. 0.01 SOL per scan.
Regex Tester
Test regular expression patterns against text with real-time match highlighting.
Color Converter
Convert colors between HEX, RGB, and HSL formats with a live preview swatch.
Markdown Preview
Write Markdown and see rendered HTML in real-time. Supports headings, bold, italic, links, code blocks, lists, and blockquotes.
URL Encoder / Decoder
Encode or decode URLs and URL components using encodeURI or encodeURIComponent with instant output.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words for your designs and mockups.
Text Diff Tool
Compare two pieces of text side by side with line-by-line diff highlighting for added and removed lines.
Password Generator
Generate strong, random passwords with customizable length, character types, and a strength indicator.
Cron Expression Parser
Enter a cron expression to get a human-readable description and upcoming run times. Includes common presets.
QR Code Generator
Enter text or a URL to generate a QR code. Adjustable size and download as PNG. Canvas-based with no external library.
UUID Generator
Generate random v4 UUIDs. Bulk generate up to 100 at once, copy individual or all, and toggle hyphens on or off.
Unix Permissions Calculator
Toggle read, write, and execute for owner, group, and other. See numeric (755) and symbolic (rwxr-xr-x) in real-time.
SQL Formatter
Paste messy SQL to format with proper indentation and keyword uppercasing. Supports SELECT, INSERT, UPDATE, DELETE, CREATE, and ALTER.
YAML / JSON Converter
Convert between YAML and JSON formats with a built-in parser. Handles nested objects, arrays, strings, numbers, and booleans.
Aspect Ratio Calculator
Calculate dimensions from an aspect ratio (16:9, 4:3, 1:1, 21:9, 9:16) or enter any two dimensions to detect the ratio.
Solana Scanner Bot on Telegram
Check token prices, wallet balances, and run rug checks — all from Telegram.
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All tools are 100% free, open source, and run client-side. Tips help keep it that way.
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