AI-ready developer utilities, browser-first by default

Browser tools for coding, debugging, data conversion, and AI workflows

Free developer tools covering 100+ use cases for AI coding, API debugging, data conversion, security, and image workflows — browser-based whenever possible, with no sign-up required.

Crypto & Hash

21 tools

Encoders & Converters

Popular developer workflows

Start with tools developers and AI-assisted coding workflows use every day.

Background Remover — Transparent PNG Maker

Remove solid white, green-screen, blue-screen, or custom color backgrounds from images in your browser. Create transparent PNG assets for games, icons, sprites, and product mockups.

JSON Formatter & Viewer — Free Online

Format, prettify, minify, and validate JSON instantly with this free online JSON formatter. Adjust indentation, sort keys, and view stats in real time.

JWT & Bearer Token Inspector - Decode JSON Web Tokens

Free online JWT decoder and Bearer token inspector. Decode JWT headers, payloads, and check expiration claims instantly in your browser.

Image Resizer, Compressor & WebP Converter

Resize, compress, and convert images to WebP, JPEG, or PNG locally in your browser. Optimize screenshots, blog images, game assets, and AI-generated images without uploading files.

JSONPath Tester — Query JSON Responses

Test JSONPath expressions against JSON data in your browser. Extract values from API responses, logs, configuration files, and AI-generated JSON payloads.

SEO Meta Auditor — GEO Content Checker

Audit HTML title, meta description, canonical URL, H1 count, and JSON-LD signals for SEO, GEO, and AI answer-engine readiness directly in your browser.

139 tools

Browse all tools by workflow

Encoding, API debugging, security, image editing, game assets, text, network, math, and data utilities.

Crypto & Hash

SHA Hash & HMAC Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes and HMAC signatures with this free online tool. No sign-up required, runs entirely in your browser.

Secure Password Generator

Generate strong, random passwords with customizable length and character sets using this free online tool. No sign-up required, runs entirely in your browser.

UUID v4 & v7 Generator

Generate UUID v4 (random) and UUID v7 (timestamp-based) identifiers in bulk with this free online tool. No sign-up required, runs entirely in your browser.

Wei Gwei Ether Converter

Convert Ethereum values between wei, gwei, and ether for gas fee estimates, transaction debugging, and smart contract development.

Ethereum Address Checksum Tool

Validate and convert Ethereum wallet addresses to EIP-55 checksum format for Web3 development and transaction safety.

ABI Selector and Calldata Inspector

Compute Ethereum ABI function selectors and inspect calldata prefixes for Solidity smart contract debugging.

Keccak-256 Hash Tool

Generate Keccak-256 hashes for Ethereum, Solidity, smart contracts, selectors, and Web3 debugging.

Transaction Calldata Decoder

Inspect Ethereum transaction calldata, function selectors, byte length, and raw input fields for Web3 debugging.

Wallet Signature Inspector

Inspect Ethereum wallet signatures, EIP-191 signed messages, r/s/v fields, and Web3 authentication payload shape.

BIP39 Seed Phrase Structure Checker

Check BIP39 recovery phrase word count, duplicate words, and common mnemonic formatting issues without sending data to a server.

Bcrypt Hash Generator & Verifier

Generate and verify bcrypt password hashes with adjustable cost factor using this free online tool. No sign-up required, runs entirely in your browser.

AES Encryption & Decryption Tool

Encrypt and decrypt text with AES-GCM or AES-CBC using this free online tool. Password-based key derivation via PBKDF2. No sign-up required, runs entirely in your browser.

Merkle Tree Root Tool

Compute Merkle tree roots from leaves for blockchain allowlists, NFT mints, airdrops, and proof debugging.

Base58 and Hex Converter

Convert cryptocurrency data between Base58 and hexadecimal encodings for wallet, Bitcoin, and blockchain debugging.

TOTP Authenticator — Two-Factor Code Generator

Free online TOTP authenticator that generates time-based one-time passwords. Supports SHA-1, SHA-256, SHA-512 algorithms. No sign-up, runs in your browser.

X.509 Certificate Decoder

Free online X.509 certificate decoder. Parse PEM certificates to view subject, issuer, validity, SAN, fingerprints, and extensions. No sign-up required.

Password Strength Analyser

Free online password strength analyser tool. No sign-up required, runs entirely in your browser.

Rsa Key Pair Generator

Free online rsa key pair generator tool. No sign-up required, runs entirely in your browser.

Ed25519 Key Generator — Sign & Verify

Free online Ed25519 key pair generator with message signing and signature verification. Uses the Web Crypto API. No sign-up, runs in your browser.

BIP39 Mnemonic Generator — Seed Phrase Creator

Free online BIP39 mnemonic generator. Create 12-24 word seed phrases with cryptographic entropy and checksum validation. No sign-up, runs in your browser.

PGP Encryption & Decryption — OpenPGP Online

Free online PGP encryption and decryption tool powered by OpenPGP.js. Encrypt messages with public keys, decrypt with private keys, and generate ECC/RSA key pairs. No sign-up required.

Encoders & Converters

Base64 String Encoder & Decoder

Encode and decode Base64 strings instantly with this free online converter. Supports standard and URL-safe Base64. No sign-up required, runs entirely in your browser.

URL Encoder & Decoder — Free Online

Encode and decode URLs instantly with this free online tool. Supports encodeURIComponent and encodeURI modes for query strings and full URLs. No sign-up required.

Base64 File Converter — Free Online

Convert files to Base64 and Base64 back to files with this free online tool. Supports images, PDFs, and any binary file. No sign-up required.

HTML Entity Encoder & Decoder — Free Online

Encode and decode HTML entities instantly with this free online tool. Escape special characters to prevent XSS and display issues. No sign-up required.

Number Base Converter

Free online number base converter. Convert between binary, octal, decimal, hexadecimal, and any base from 2 to 36 instantly.

Roman Numeral Converter

Free online roman numeral converter tool. No sign-up required, runs entirely in your browser.

Text To Binary

Free online text to binary tool. No sign-up required, runs entirely in your browser.

Text To Unicode

Free online text to unicode tool. No sign-up required, runs entirely in your browser.

.env / YAML / JSON Converter — Free Online

Convert between .env, JSON, and YAML formats instantly with this free online converter. Transform environment variable files, configuration formats, and dotenv files with one click.

Text Encoder Explorer — Unicode, UTF-8, UTF-16 Byte Inspector

Explore how text is encoded in UTF-8, UTF-16, and Unicode code points. View per-character byte breakdowns, hex dumps, and encoding statistics. Free online tool, runs entirely in your browser.

Web & Auth

JWT & Bearer Token Inspector - Decode JSON Web Tokens

Free online JWT decoder and Bearer token inspector. Decode JWT headers, payloads, and check expiration claims instantly in your browser.

QR Code Generator & Reader

Free online QR code generator and reader. Create QR codes from text or URLs and decode QR codes from uploaded images instantly.

URL Parser - Parse & Analyze URL Components Online

Free online URL parser tool. Break down any URL into its components — protocol, hostname, port, path, query parameters, and hash fragment.

SEO Meta Auditor — GEO Content Checker

Audit HTML title, meta description, canonical URL, H1 count, and JSON-LD signals for SEO, GEO, and AI answer-engine readiness directly in your browser.

Webhook Signature Verifier

Verify SHA-256 HMAC webhook signatures for GitHub, Stripe, Slack, and custom API integrations locally in the browser.

CSP Evaluator

Evaluate Content-Security-Policy headers for unsafe directives, missing defaults, wildcard sources, and browser security hardening.

HTTP Request Builder

Free online HTTP request builder. Visually construct API requests and generate ready-to-use curl, fetch, and axios code snippets.

HTTP Status Codes Reference - Complete Status Code Guide

Free online HTTP status codes reference. Search and browse all HTTP response status codes with descriptions, categories, and common use cases.

HTTP Cache Policy Builder

Build Cache-Control headers for browser caching, CDN caching, immutable assets, and API response freshness.

JWT JWK JWKS Inspector

Inspect JWK and JWKS public keys, kid values, algorithms, and OAuth/OIDC signing metadata directly in your browser.

Basic Auth Generator & Decoder - HTTP Authorization Header

Free online Basic Auth header generator and decoder. Create HTTP Basic Authorization headers from credentials or decode existing headers instantly.

HAR Analyzer

Analyze HAR files for request counts, response bytes, slow requests, status codes, and web performance debugging.

OAuth2 Token Debugger - Decode Tokens & Parse Auth URLs

Free online OAuth2 token debugger. Decode JWT access tokens and id tokens, parse OAuth2 authorization URLs, and inspect OIDC parameters.

OG Meta Tag Preview

Free online Open Graph meta tag preview tool. See how your page looks on Google, Facebook, Twitter, and LinkedIn before publishing.

Open Graph and Twitter Card Generator

Generate Open Graph, Twitter Card, title, and meta description tags for social sharing and SEO previews.

SRI Hash Generator

Generate Subresource Integrity sha256 and sha384 hashes for CDN scripts and stylesheets in the browser.

Cookie Parser

Free online cookie parser tool. Parse and inspect Set-Cookie headers and document.cookie strings to view names, values, and attributes.

CORS Header Checker

Free online CORS header checker and analyzer. Validate Access-Control headers, diagnose cross-origin issues, and verify preflight configuration.

OpenAPI / Swagger Viewer

Free online OpenAPI 3.x viewer. Paste YAML or JSON to visualize API endpoints, parameters, responses, and schemas. No sign-up required.

CSP Header Builder

Free online Content Security Policy (CSP) header builder and generator. Visually configure CSP directives, validate policies, and test URLs against your security rules.

SAML Response Decoder - Decode & Format SAML XML

Free online SAML response decoder. Decode Base64-encoded SAML responses, format the XML output, and inspect SSO assertions instantly.

robots.txt & Sitemap Validator - Validate Robots Rules & Sitemap XML Online

Free online robots.txt and sitemap.xml validator. Parse and validate robots.txt directives, test URL access rules, and verify sitemap XML structure, URLs, and metadata.

Safelink Decoder

Free online safelink decoder tool. No sign-up required, runs entirely in your browser.

User Agent Parser

Free online user agent parser tool. No sign-up required, runs entirely in your browser.

HTTP Header Parser - Analyze & Inspect HTTP Headers Online

Free online HTTP header parser tool. Parse raw HTTP headers, inspect key-value pairs, and check security headers like CSP, HSTS, X-Frame-Options, and more.

Device Information - Browser, Screen & Hardware Details

View detailed device and browser information including user agent, screen resolution, GPU, CPU cores, memory, connection type, and more — all detected in real time.

Development

Regex Tester & Debugger

Free online regex tester to match, replace, and debug regular expressions with real-time highlighting and capture group support.

Unix Timestamp Converter

Free online Unix timestamp converter to convert between epoch timestamps and human-readable dates in ISO, UTC, and local formats.

Color Converter & Picker

Free online color converter and picker tool to convert between HEX, RGB, and HSL formats with a visual color preview.

Crontab Generator & Explainer

Free online crontab expression generator and explainer. Build cron schedules visually or paste an expression to get a plain-English description.

Text Diff Viewer & Comparator

Free online diff viewer to compare two texts side by side or in unified format, highlighting additions, deletions, and changes instantly.

Text Case & Format Converter

Free online text case converter to transform text between camelCase, snake_case, PascalCase, kebab-case, and 10+ other formats instantly.

Chmod Permission Calculator

Free online chmod calculator to set Unix/Linux file permissions. Convert between octal, symbolic notation, and get the chmod command instantly.

Docker Run to Compose Converter

Free online tool to convert docker run commands to docker-compose.yml format. Instantly transform container commands into composable YAML configurations.

Code Formatter — Prettier Online

Free online code formatter powered by Prettier. Format JavaScript, TypeScript, HTML, Vue, CSS, SCSS, JSON, YAML, Markdown, and GraphQL with customizable options. No sign-up required.

Fake Data Generator

Generate realistic fake data for testing and development — names, emails, addresses, phone numbers, UUIDs, and more. Powered by Faker.js with multi-locale support.

URL Slug Generator

Free online URL slug generator. Convert any text to SEO-friendly, URL-safe slugs with customizable separators, case options, and length limits.

CSS Unit Converter

Free online CSS unit converter. Convert between px, rem, em, pt, %, vw, and vh with customizable base font size and viewport dimensions.

Lorem Ipsum Generator

Free online Lorem Ipsum placeholder text generator. Generate dummy text by paragraphs, sentences, or words for mockups and designs.

Mermaid Live Editor — Diagram Generator

Free online Mermaid diagram editor. Create flowcharts, sequence diagrams, class diagrams, Gantt charts, pie charts, and mind maps. Export to SVG or PNG. No sign-up required.

Accessibility Color Contrast Checker

Free online WCAG color contrast checker. Calculate contrast ratios, verify AA/AAA compliance, preview text readability, and simulate color blindness for accessible design.

Date-Time Converter with Timezone Support

Free online date-time converter to convert dates and times across timezones. Supports ISO 8601, RFC 2822, Unix timestamps, and relative time — powered by native Intl APIs.

Git Cheatsheet - Quick Command Reference & Memo

Free online Git cheatsheet with searchable commands organized by category. Quickly find Git commands for branching, merging, rebasing, stashing, resetting, and more.

Git Commit Message Generator

Free online Git commit message generator using the Conventional Commits format. Build structured commit messages with type, scope, description, body, breaking changes, and footer fields.

Keycode Info

Free online keycode info tool. No sign-up required, runs entirely in your browser.

Mime Types

Free online mime types tool. No sign-up required, runs entirely in your browser.

Nginx Config Generator

Free online Nginx configuration file generator. Build server blocks with SSL, reverse proxy, gzip, security headers, WebSocket support, and more — no manual editing required.

Pdf Signature Checker

Free online pdf signature checker tool. No sign-up required, runs entirely in your browser.

Dockerfile Linter

Analyze your Dockerfile for best practices, security issues, and optimization opportunities with instant feedback and actionable suggestions.

FILETIME & LDAP Timestamp Converter

Free online FILETIME and LDAP/Active Directory timestamp converter. Convert 18-digit Windows FILETIME to human-readable dates and back. Live clock included.

Color Space Explorer — OKLCH, OKLab, P3 & More

Free online extended color space converter. Convert between HEX, RGB, HSL, HWB, OKLab, OKLCH, Linear sRGB, and Display P3 with CSS output. No sign-up required.

Tailwind CSS Class Sorter — Organize Utility Classes

Free online Tailwind CSS class sorter. Organize utility classes following the official recommended order with duplicate removal. No sign-up required.

Benchmark Builder — JavaScript Performance Testing

Free online JavaScript benchmark tool. Compare code snippet performance with operations-per-second metrics and visual bar charts. No sign-up required.

Figma Token Converter — Design Tokens to CSS/Tailwind

Free online Figma design token converter. Transform JSON design tokens to CSS custom properties, SCSS variables, Tailwind config, or JS exports. No sign-up required.

GraphQL Playground — Schema Validator & Query Formatter

Free online GraphQL playground. Validate queries against your schema, format GraphQL queries, and inspect schema types. Works offline, no sign-up required.

Network

CIDR Calculator & Subnet Visualizer

Free online CIDR calculator. Compute network address, broadcast, subnet mask, host range, and total hosts from any CIDR notation.

Ipv4 Address Converter

Free online ipv4 address converter tool. No sign-up required, runs entirely in your browser.

Ipv4 Range Expander

Free online ipv4 range expander tool. No sign-up required, runs entirely in your browser.

Ipv6 Ula Generator

Free online ipv6 ula generator tool. No sign-up required, runs entirely in your browser.

Mac Address Generator

Free online mac address generator tool. No sign-up required, runs entirely in your browser.

Mac Address Lookup

Free online mac address lookup tool. No sign-up required, runs entirely in your browser.

Random Port Generator

Free online random port generator tool. No sign-up required, runs entirely in your browser.

Text

Markdown Preview & Editor

Free online Markdown editor with live preview. Write and preview Markdown with GFM support, tables, code blocks, and more — all in your browser.

List Converter

Free online list converter tool. No sign-up required, runs entirely in your browser.

Markdown Table Generator — Free Online GFM Table Builder

Generate well-formatted GitHub Flavored Markdown (GFM) tables with an interactive visual editor. Set column alignment, add or remove rows and columns, and copy the output instantly.

Numeronym Generator

Free online numeronym generator tool. No sign-up required, runs entirely in your browser.

String Obfuscator

Free online string obfuscator tool. No sign-up required, runs entirely in your browser.

Text Statistics

Free online text statistics tool. No sign-up required, runs entirely in your browser.

Text To Nato Alphabet

Free online text to nato alphabet tool. No sign-up required, runs entirely in your browser.

Emoji Picker & Search

Free online emoji picker and search tool. Browse, search, and copy emojis by category — smileys, animals, food, symbols, flags, and more. Click any emoji to copy it to your clipboard instantly.

ASCII Text Drawer / Art Generator

Free online ASCII art text generator. Convert any text into large block letters, shadow art, or simple ASCII banners — no external libraries required.

Email Normalizer

Normalize and deduplicate email addresses by removing dots, plus aliases, and provider-specific suffixes to find canonical forms.

Unicode Character Lookup — Code Point Inspector

Free online Unicode character lookup tool. Inspect text to see code points, UTF-8/UTF-16 encoding, Unicode block, and category. Search by U+ code point. No sign-up required.

HTML WYSIWYG Editor — Rich Text to HTML

Free online WYSIWYG HTML editor. Create rich text content with formatting tools and get clean HTML output. Supports headings, lists, code blocks, blockquotes, and more. No sign-up required.

Data Formats

JSON Formatter & Viewer — Free Online

Format, prettify, minify, and validate JSON instantly with this free online JSON formatter. Adjust indentation, sort keys, and view stats in real time.

Data Format Converter — Free Online

Convert between JSON, YAML, TOML, and CSV instantly with this free online data format converter. Swap formats with one click, no sign-up required.

JSONPath Tester — Query JSON Responses

Test JSONPath expressions against JSON data in your browser. Extract values from API responses, logs, configuration files, and AI-generated JSON payloads.

API Mock Data Generator — JSON Test Payloads

Generate deterministic JSON mock data for frontend development, API contracts, tests, documentation, and AI-assisted prototyping directly in your browser.

JSON Schema Generator & Validator — Free Online

Generate JSON Schema from sample data or validate JSON against a schema with this free online tool. Uses Ajv for validation. No sign-up required.

CSV Viewer & Editor — Free Online

View, edit, sort, and export CSV data in a spreadsheet-like table. Supports custom delimiters (comma, tab, semicolon, pipe). Powered by PapaParse — no data leaves your browser.

SQL Formatter & Beautifier — Free Online

Format, beautify, and pretty-print SQL queries instantly. Supports MySQL, PostgreSQL, SQLite, T-SQL, PL/SQL, MariaDB, BigQuery, and standard SQL with customizable indentation and keyword casing.

Iban Validator And Parser

Free online iban validator and parser tool. No sign-up required, runs entirely in your browser.

Phone Parser And Formatter

Free online phone parser and formatter tool. No sign-up required, runs entirely in your browser.

Protobuf to JSON Converter

Free online Protocol Buffers (Protobuf) to JSON converter. Encode JSON to Protobuf binary and decode Protobuf binary back to JSON. Paste your .proto schema and data. No sign-up required.

Images & Videos

Image Resizer, Compressor & WebP Converter

Resize, compress, and convert images to WebP, JPEG, or PNG locally in your browser. Optimize screenshots, blog images, game assets, and AI-generated images without uploading files.

Background Remover — Transparent PNG Maker

Remove solid white, green-screen, blue-screen, or custom color backgrounds from images in your browser. Create transparent PNG assets for games, icons, sprites, and product mockups.

EXIF Metadata Remover — Photo Privacy Tool

Remove EXIF metadata from JPEG photos in your browser, including GPS location, camera model, timestamp, and editing software tags when stored in EXIF segments.

Color Palette Extractor from Image

Extract dominant colors from images locally in your browser and export palettes as HEX values or CSS variables for UI design, game assets, and AI-generated artwork.

SVG to PNG and Icon Converter

Convert SVG markup to PNG icons in common favicon and app-icon sizes directly in your browser. Export 16, 32, 180, 192, and 512 px icon images.

Passport Photo Maker — Free Online ID Photo Resizer

Create passport, visa, ID, and profile photo sizes from an uploaded image. Crop and resize locally in your browser for 2x2, 35x45 mm, China ID, and square avatar formats.

Sprite Sheet Cutter — Game Asset Slicer

Slice sprite sheets and texture atlases into individual frames in your browser. Use grid rows and columns to export game sprites, UI icons, and animation frames.

Power-of-Two Texture Resizer for Game Assets

Resize textures and images to power-of-two dimensions such as 256, 512, 1024, or 2048 for WebGL, Unity, Godot, Unreal, and game asset pipelines.

SVG Optimizer & Viewer — SVGO Online

Free online SVG optimizer powered by SVGO. Compress SVG files, remove metadata, and preview results side-by-side. No sign-up required.

Favicon Generator — Multi-Size Icon Creator

Free online favicon generator. Upload an image to create favicons in all standard sizes (16x16 to 512x512) with HTML and manifest snippets. No sign-up required.

Image/Color Placeholder Generator

Free online placeholder image generator. Create custom colored placeholder images with text overlay in SVG or PNG format for mockups, wireframes, and prototyping.

Camera Recorder — Webcam Video Capture

Free online camera recorder. Record video from your webcam with optional audio, pause/resume, and download as WebM. No sign-up, runs in your browser.

Math

Statistics Calculator

Calculate count, sum, mean, median, min, max, variance, and standard deviation from numeric datasets.

Matrix Calculator

Calculate matrix transpose, determinant, row and column sizes for linear algebra, graphics, and engineering workflows.

Quadratic Equation Solver

Solve ax² + bx + c quadratic equations, calculate discriminants, and return real or complex roots.

Prime Factorization Calculator

Factor integers into primes for number theory, coding challenges, cryptography learning, and math homework checks.

Math Evaluator

Free online math evaluator tool. No sign-up required, runs entirely in your browser.

Percentage Calculator

Free online percentage calculator. Compute X% of Y, find what percent X is of Y, calculate percentage change, and increase or decrease values by a percentage.