BIP39 Mnemonic Converter Generate new BIP39 mnemonic seed phrases or convert an existing phrase to its corresponding seed, extended private key (xprv), and derivation path. Supports 12, 15, 18, 21, and 24-word phrases with an optional passphrase (BIP39 passphrase / 25th word). All computation is fully client-side. How to Use Choose Generate to create a ...
Try the Tool »EMI / Loan Repayment Calculator Calculate your monthly loan EMI (Equated Monthly Installment), view a full amortization schedule, analyze prepayment savings, and compare loan offers side by side. Supports both reducing balance and flat rate methods. All calculations happen instantly in your browser. How to Use Enter your loan amount, annual interest rate, and tenure ...
Try the Tool »Triangle & Trigonometry Calculator Solve any triangle from three known values — enter sides and angles in any valid combination (SSS, SAS, ASA, AAS, SSA) and instantly get all missing measurements, area, perimeter, heights, inradius, circumradius, and triangle classification. Includes step-by-step solutions, an SVG diagram, and a quick reference for special right triangles. How to ...
Try the Tool »Routing Number Generator Generate valid US ABA routing numbers for testing and development. Each generated number follows the correct 9-digit format with a properly calculated check digit, making them suitable for validating payment processing systems, testing bank integrations, and populating test databases. How to Use Set the number of routing numbers to generate (1–50), optionally ...
Try the Tool »Random Bitcoin Address Generator Generate random Bitcoin wallet addresses for testing and development. Create properly formatted addresses in all four major Bitcoin address formats — Legacy (P2PKH), Script Hash (P2SH), SegWit (Bech32), and Taproot (Bech32m). Ideal for testing payment processing integrations, populating test databases, and validating address format checks. How to Use Set the number ...
Try the Tool »URL Opener Open multiple URLs at once by pasting a list and clicking a single button. Instead of opening links one by one, paste your entire URL list and let this tool open them all in new browser tabs simultaneously. Ideal for QA testing, checking multiple pages, reviewing search results, or opening a batch of ...
Try the Tool »Open Graph Checker Inspect and preview the Open Graph meta tags on any URL to see exactly how your page will appear when shared on social media. This tool fetches the page, extracts all OG and Twitter Card meta tags, and shows you a visual preview of the social share card — plus flags any ...
Try the Tool »Redirect Checker Trace the full redirect chain for any URL and see every hop along the way. This tool follows redirects from start to finish, showing the HTTP status code, URL, and response time at each step. Essential for debugging redirect chains, verifying SEO migrations, and finding redirect loops before they cause problems. How to ...
Try the Tool »HEX to Text Converter Convert hexadecimal strings back to readable text instantly. Paste hex values in any common format — with spaces, dashes, 0x prefixes, or raw hex — and get the decoded text output. The reverse of our Text to Hex converter, perfect for decoding hex dumps, debugging network data, and reading encoded strings. ...
Try the Tool »SQL Escape Escape special characters in strings for safe use in SQL queries. Supports multiple SQL dialects including MySQL, PostgreSQL, SQL Server, and SQLite. Prevents SQL injection by properly escaping quotes, backslashes, and other dangerous characters before they reach your database. How to Use Paste your raw string into the input area, select your SQL ...
Try the Tool »JSON Escape and Unescape Escape and unescape special characters in JSON strings. Convert raw text with quotes, newlines, tabs, and Unicode characters into properly escaped JSON string values, or reverse the process to recover the original text from escaped JSON. Essential for working with APIs, configuration files, and any JSON data handling. How to Use ...
Try the Tool »JavaScript Escape and Unescape Escape and unescape special characters in JavaScript string literals. Convert raw text with quotes, newlines, tabs, and Unicode into properly escaped JavaScript strings, or reverse the process to recover original text. Choose between single-quote and double-quote wrapping styles. How to Use Paste your text into the input area, select Escape or ...
Try the Tool »PHP Array to JSON Converter Convert PHP array syntax to valid JSON format instantly. Paste PHP arrays using either the classic array() or modern [] short syntax, and get properly formatted JSON output. Handles nested arrays, associative key-value pairs, PHP constants (true, false, null), and trailing commas. How to Use Paste your PHP array code ...
Try the Tool »Cron Next-Run Time Calculator Enter a cron expression and instantly see when it will fire next. This tool parses standard 5-field cron expressions, calculates the next scheduled run times, generates a human-readable description, and shows a countdown to the next execution — all in your local timezone and UTC. How to Use Type or paste ...
Try the Tool »Color Contrast Grid Generator Enter your brand or design system colors and generate a complete WCAG contrast matrix showing the contrast ratio for every possible foreground/background combination. Instantly see which color pairs pass AA, AAA, or fail accessibility requirements — essential for building accessible design systems and style guides. How to Use Enter hex colors ...
Try the Tool »Base85 / Ascii85 Encoder & Decoder Encode text to Base85 or decode Base85-encoded data back to its original form. Base85 encoding converts 4 bytes of binary data into 5 printable ASCII characters, offering better space efficiency than Base64 (25% overhead vs 33%). This tool supports three major Base85 variants used across different applications. How to ...
Try the Tool »Credit Card BIN / IIN Lookup Enter the first 6-8 digits of any credit or debit card number to identify the card network, issuing bank, country of issuance, card type, and category. This tool also includes Luhn algorithm validation to check if a full card number has a valid format. Everything runs in your browser ...
Try the Tool »Twitter / X Character Counter Write and count your tweet with Twitter’s exact character counting rules. This tool applies the same algorithm Twitter/X uses — URLs always count as 23 characters regardless of length, and emoji have weighted counts. Real-time feedback shows remaining characters with color-coded warnings, and thread mode splits long content into multiple ...
Try the Tool »Hex Dump Viewer View any text or file as a hex dump in the classic xxd format — offset address, grouped hex bytes, and printable ASCII characters side by side. Upload a binary file or paste text to inspect raw byte values, search for patterns, and configure the display to match your preferred format. How ...
Try the Tool »Time Duration Formatter Convert any duration — entered in seconds, milliseconds, or clock format — into multiple human-readable representations simultaneously. See verbose, short, ISO 8601, clock, and approximate formats side by side, with a full breakdown by time unit. How to Use Select your input mode (Seconds, Milliseconds, or Clock hh:mm:ss), enter your duration value, ...
Try the Tool »Add IO tools to your favorite browser for instant access and faster searching
Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
Update: Our latest tool was added on Apr 1, 2026
Help us continue providing valuable free tools
