Free browser-based utilities that streamline coding tasks with instant text processing, data conversion, and validation capabilities.
Protobuf Text to JSON Converter Convert between Protobuf text format and JSON instantly. Parse Protobuf TextProto (the human-readable text representation of Protocol Buffer messages) into JSON, or convert JSON back into Protobuf text format. Supports nested messages, repeated fields, and configurable indentation. How to Use Select your conversion direction (Protobuf Text → JSON or JSON ...
Try the Tool »Tarot Birth Card Calculator Discover your tarot birth card — the Major Arcana card (or pair) that represents your core personality archetype and life themes. Enter your birthdate and instantly see your birth card pair, personality traits, strengths, challenges, and elemental associations based on traditional numerological calculation. How to Use Enter your birth date using ...
Try the Tool »EAN-13 / UPC-A Barcode Generator Generate scannable barcodes in EAN-13, UPC-A, EAN-8, Code 128, and Code 39 formats. Enter your data, customize dimensions and colors, and download as PNG or SVG. Auto-calculates check digits for EAN and UPC formats. Everything runs in your browser — no server processing. How to Use Enter the barcode data ...
Try the Tool »ISBN Validator & Checksum Checker Validate ISBN-10 and ISBN-13 numbers instantly with precise checksum verification. This tool checks whether an ISBN is mathematically valid, converts between ISBN-10 and ISBN-13 formats, auto-formats with proper hyphenation, and identifies registration groups. Perfect for publishers, librarians, booksellers, and developers working with book metadata. How to Use Enter a single ...
Try the Tool »Prisma Schema Formatter Format your Prisma schema files instantly with proper indentation, column-aligned fields, and consistent styling. This tool applies the same formatting conventions as prisma format — aligning field names, types, and attributes into clean columns — entirely in your browser. Paste messy or inconsistent .prisma schemas and get clean, readable output in one ...
Try the Tool »Dotenv to JSON Converter Convert between .env files and JSON instantly with this bidirectional converter. Paste your .env content to get a clean JSON object, or paste JSON to generate properly formatted KEY=VALUE pairs. Handles quoted values, inline comments, multiline strings, export prefixes, and supports nested JSON output by splitting keys on double underscores (__). ...
Try the Tool »Kubernetes YAML Formatter & Validator Format and validate your Kubernetes manifest YAML files instantly in the browser. Paste any K8s manifest — Deployments, Services, ConfigMaps, Ingress, CronJobs, and more — and get consistent 2-space indentation, optional key sorting, and schema validation against 19 Kubernetes resource types. Catches missing required fields, deprecated apiVersions, selector/label mismatches, and ...
Try the Tool »CSV Column Extractor & Reorderer Extract, reorder, rename, and filter columns from CSV files directly in your browser. Paste CSV data or upload a file, then use drag-and-drop to rearrange columns, checkboxes to include or exclude them, and inline editing to rename headers. Preview the transformed output and download or copy the result as a ...
Try the Tool »X.509 Certificate Parser Parse and inspect X.509 certificates and CSRs from PEM format. Instantly see the subject, issuer, validity dates, serial number, public key details, signature algorithm, SAN (Subject Alternative Names), key usage extensions, and full field breakdown — without uploading the certificate to any server. How to Use Paste your PEM-encoded certificate (beginning with ...
Try the Tool »Cryptographic Nonce Generator Generate cryptographically secure nonces (numbers used once) for CSP headers, OAuth state parameters, CSRF tokens, session IDs, and more. Uses crypto.getRandomValues() for true randomness — no Math.random() fallback. Output in hex, Base64, Base64url, or decimal array format. Everything runs in your browser; nothing is sent to any server. How to Use Select ...
Try the Tool »Color Scheme Generator Generate harmonious color palettes using color theory. Pick a base color and choose a harmony type — complementary, triadic, analogous, split-complementary, tetradic, or monochromatic — to instantly create a balanced palette. Visual swatches show hex, RGB, and HSL values. WCAG contrast checking ensures accessibility. Export as CSS custom properties, JSON, Tailwind config, ...
Try the Tool »IPv6 Subnet Calculator Calculate IPv6 subnet details from a CIDR notation address. Enter any IPv6 address with a prefix length (e.g. 2001:db8::1/48) and instantly see the network address, first and last usable host, subnet mask, total address count, address type classification, and full expanded/compressed forms. How to Use Enter an IPv6 address with its prefix ...
Try the Tool »Weighted Random Picker Randomly select items from a list with custom weights — give some items higher chances of being picked than others. Uses cryptographic randomness for fair, unbiased selections. Pick one or multiple items, with or without replacement, and track your pick history and statistics. How to Use Add items and assign weights to ...
Try the Tool »Environment Secrets Generator Generate cryptographically secure environment variable values for your .env files. Create JWT secrets, database passwords, API keys, session secrets, and more — all using crypto.getRandomValues() for true randomness. Nothing is sent to any server; everything runs in your browser. How to Use Click preset buttons to add common environment variables (JWT_SECRET, DATABASE_PASSWORD, ...
Try the Tool »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 »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 4, 2026
Help us continue providing valuable free tools
