Browser-Based Development Tools
All tools run entirely in your browser. No data leaves your machine. Free for commercial use.
Free & Commercial Use
No subscriptions or additional fees. Completely free to use for personal and commercial projects.
Secure & Local
100% client-side processing. We never send your input data to any server.
Text & Data Processing
Markdown Editor
A free Markdown editor with real-time preview supporting GitHub Flavored Markdown. Beautifully export your crafted documents as PDF files or PNG images. Works entirely in your browser, ensuring your text inputs are never sent to any external server.
Markdown Viewer
A free local viewer specialized in clean viewing, display, and PDF/PNG export conversion of Markdown files. Optimized for documentation preview with rapid loading speeds. Works entirely in your browser, ensuring your file data is never sent to any external server.
Word & Character Counter
A free tool to count characters, words, lines, paragraphs, and bytes in your text in real-time. Perfect for drafting manuscripts or checking input limits. Works entirely in your browser, ensuring your text data is never sent to any external server.
Lorem Ipsum Generator
A free tool to generate realistic placeholder text (Lorem Ipsum) for your designs and layouts. Customize paragraphs and word counts for bulk generation. Works entirely in your browser, ensuring fast and secure text generation without network latency.
Base64 Encoder / Decoder
A free tool to securely encode or decode text and files using Base64. Supports bidirectional conversion with real-time preview. Works entirely in your browser, ensuring your data is never sent to any external server.
URL Encoder / Decoder
A free tool to securely encode or decode URL components and parameters. Supports bulk conversion of special characters seamlessly. Works entirely in your browser, ensuring your data is never sent to any external server.
Encoding Converter
A free tool to convert text to various encodings such as UTF-8 and Shift-JIS. View exact hexadecimal (Hex) and binary byte sequences easily. Works entirely in your browser, ensuring your data is never sent to any external server.
Security & Cryptography
Random String Generator
A free tool to instantly generate secure random strings and passwords. Features customizable character sets and exclusion of ambiguous characters. Works entirely in your browser, ensuring your data is never sent to any external server.
Password Generator
A free tool to generate secure random passwords or deterministic passwords offline. Offers fine-grained control over length and symbol usage. Works entirely in your browser, ensuring your password information is never sent to any external server.
UUID Generator
A free tool to instantly generate thousands of Version 4 (v4) UUIDs in bulk. Creates cryptographically secure random identifiers. Works entirely in your browser without network requests, ensuring your session is completely private.
Hash Generator
A free tool to instantly generate cryptographic hash values like SHA-256, SHA-512, and MD5 from text. Supports comprehensive algorithms and file hashing. Works entirely in your browser, ensuring your data is never sent to any external server.
File Encrypt/Decrypt
A free tool to securely encrypt and decrypt files using robust AES-GCM algorithms. Handles large files quickly and efficiently. Works entirely in your browser, ensuring your data is never sent to any external server.
JWT Encoder / Decoder
A free tool to decode, inspect, and re-encode JSON Web Tokens (JWT). Clearly displays headers and payloads with styled indentation. Works entirely in your browser, ensuring your tokens are never sent to any external server.
Date & Time
Unix Timestamp Converter
A free tool to instantly convert between Unix timestamps and human-readable dates. Supports milliseconds and real-time current timestamp fetching. Works entirely in your browser without network requests, ensuring your session is completely private.
Date Difference
A free tool to calculate the exact duration (days, weeks, months, years) between two specified dates instantly. Useful for business day conversions and project timeline estimations. Works entirely in your browser, protecting your privacy by never transmitting data externally.
Date Add/Subtract
A free, advanced tool to calculate accurate future or past dates by adding or subtracting specific time units. Includes functionality for Unix timestamp conversions. Works entirely in your browser, ensuring secure calculations without any unnecessary network traffic.
Development & Formatting
Lines of Code (LOC) Analyzer
A free tool to count source lines of code, comment lines, and blank lines across multiple files. Supports various programming languages. Works entirely in your browser, ensuring your source code is never uploaded to any external server.
Function Point Calculator
A free tool to accurately estimate software development scale using the IFPUG Function Point method. Calculate UFP, VAF, and AFP to determine man-months. Works securely in your browser.
JSON Formatter
A free tool to format, minify, and validate JSON data. Features built-in validation to quickly identify syntax errors. Works entirely in your browser, ensuring your data is never sent to any external server.
JSON to TypeScript Converter
A free tool to automatically infer and generate TypeScript type definitions (Interfaces/Types) by parsing JSON structures. Boosts development efficiency for API integrations. Works entirely in your browser, ensuring your JSON and type information is never sent to any server.
JSON ↔ JS Object Converter
A free tool to bidirectionally convert between strict JSON (requires double quotes) and JS Object notation (omitted keys). Reduces copy-paste errors across both formats. Works entirely in your browser, ensuring your sensitive data is never sent to any external server.
JSON ⇔ XML Converter
Bidirectionally convert between JSON and XML formats. Fast, local, and works entirely in your browser.
PlantUML Viewer
A free preview viewer to parse PUML code and render UML class and sequence diagrams instantly (WASM Engine powered). Supports direct image downloading. Works entirely in your browser, ensuring your source code is never sent to any external server.
PlantUML Editor
A free PlantUML browser editor designed for drawing with real-time live preview capabilities. Verify UML diagrams instantly as you type and save images easily. Works entirely in your browser, ensuring your diagram data is never sent to any external server.
Mock Data Generator
A free tool to instantly generate massive amounts of mock data (JSON, CSV, JS Object) for testing. Intuitively define complex structures with arrays, numbers, and UUIDs. Works entirely in your browser, ensuring your data is never sent to any external server.
Number Base Converter
A free tool to convert numbers between binary, octal, decimal, and hexadecimal bases in real-time. Ideal for programming, network configurations, and binary analysis. Works entirely in your browser, ensuring your data is never sent to any external server.
AI Prompt Code Merger
A free tool to combine source code files or entire directories into a single text document for ChatGPT or Claude. Equipped with folder-level exclusion filters. Works entirely in your browser, ensuring your valuable source code is never uploaded to any external server.
Images & Media
Color Converter & Palette
A free tool to convert between HEX, RGB, and HSL color codes, and auto-generate Tailwind CSS compatible palettes. Extract colors easily with an intuitive color picker. Works entirely in your browser, ensuring your data is never sent to any external server.
Image Optimizer (Resize/Compress)
A free tool to resize, compress, and convert PNG, JPEG, WebP, and AVIF images. Supports lossless compression and bulk exporting. Works entirely in your browser, ensuring your images are never uploaded to any external server.
Base64 ↔ Image Converter
A free tool to convert images to Base64 data URIs, or decode Base64 text back to downloadable images. Convenient for directly embedding images into HTML or CSS. Works entirely in your browser, ensuring your image files are never uploaded to any server.
Image Text Extractor (OCR)
A free tool to extract text from images with high accuracy using AI OCR. Supports multiple languages for scanned documents and screenshots. Works entirely in your browser, ensuring your images are never uploaded to any external server.
QR Code Generator
A free tool to instantly generate custom QR codes from URLs or text. Freely customize colors and error correction levels, and download as PNG/SVG. Works entirely in your browser, ensuring your input data is never sent to any external server.
Network & System
Web API Tester
A free API development client to visually test HTTP requests (GET/POST) and inspect headers or responses. Ideal for verifying CORS configurations. Requests are made directly from your device, ensuring our servers never intercept or log your traffic.
Global IP & Network Info
A free tool to check your public IP address and browser environment details instantly. Useful for diagnosing ISP info, location, and User-Agents. Your public IP is retrieved via a secure ping, but your access history is never saved or tracked by our site.