100% Private & Offline
Free in-browser tools for everyday work.
Pick a utility below. All 52 tools process files and text locally in your browser with full offline PWA support—meaning zero server uploads, complete privacy, and instant responsiveness even without an internet connection.
Tools
52
Categories
15
Offline
100% PWA
Directory
Browse by Category
52 available
Image
Utility
Design
Security
Developer
JSON Formatter
Validate, pretty-print, minify, and sort JSON locally in your browser.
YAML JSON Converter
Convert YAML to JSON or JSON to YAML with formatting controls.
HTML CSS JS Minifier
Minify HTML, CSS, or JavaScript locally with copy and download actions.
CSV to JSON
Convert pasted CSV into JSON objects or row arrays with copy and download.
Regex Tester
Test JavaScript regular expressions with flags, highlights, and capture groups.
URL Encoder / Decoder
Encode and decode URLs, query components, Base64 text, and query parameters.
Base64 Encoder / Decoder
Encode text, decode Base64, or convert files into Base64 data locally.
Text
Markdown Previewer
Write Markdown, preview formatted HTML, and copy the source or rendered markup.
Text Diff Checker
Compare two text blocks with added, removed, and changed line highlights.
Lorem Ipsum Generator
Generate placeholder words, sentences, or paragraphs with copy and download.
Word / Character Counter
Count words, characters, lines, reading time, and keyword density.
Typing Speed Test
Measure WPM, accuracy, mistakes, and progress with timed typing passages.
Math
Finance
Time
Date
Health
SEO
Accessibility
Screen Reader Simulator
Preview simplified reading order and announcements from pasted HTML.
Focus
Architecture & Security
Why In-Browser Utilities Outperform Traditional Cloud Tools
Zero Server Data Storage
Your documents, source code, images, and calculations never leave your machine. Everything executes locally in your browser runtime via HTML5 Canvas, Web Workers, and WebAssembly.
Zero Cloud Upload Latency
Skip remote server queues. Large PDFs and high-resolution images process instantly using your device's physical hardware, delivering instant results without upload bottlenecks.
100% Offline PWA Ready
Install Manjurul to your desktop or mobile home screen as a standalone application. Our background Service Worker caches all 52 utilities, enabling full offline productivity on airplanes, during travel, or with zero internet connection.
Comprehensive Browser Utilities Across 7 Disciplines
Manjurul unifies everyday productivity tasks into a distraction-free, privacy-preserving workspace. Whether you are a software developer, web designer, student, health researcher, or digital marketer, our utilities provide authoritative mathematical calculations and file transformations:
PDF & Document Tools
In-browser PDF compression, document merging, page splitting, and PDF-to-image extraction powered by client-side Web Workers.
Image & Media Utilities
Convert between PNG, JPG, and WebP, generate multi-size favicon packages, resize banners, and render creative ASCII art directly on HTML5 Canvas.
Code Minifiers & Converters
Compress HTML, CSS, and JavaScript using Terser and CSSO; optimize vector SVGs, convert YAML to JSON, and generate TypeScript interfaces from raw payloads.
Calculators & Health Formulas
Scientific calculations, loan amortization schedules, BMI, Ideal Body Weight, Cockcroft-Gault Creatinine Clearance, and optimal sleep cycle estimators.
Security & Cryptography
Cryptographically secure password generation using browser CSPRNG, v4 UUIDs, SHA-256/512 hashes, and client-side JWT token structure inspection.
SEO & Webmaster Tools
Generate compliant robots.txt directives, XML sitemaps, OpenGraph social meta tags, and test web accessibility with our screen reader simulator.
True Offline Architecture
Every calculator, converter, and PDF tool runs via client-side Web Workers, WebAssembly, and Canvas. No backend API calls are made, allowing complete productivity with zero internet.
Frequently Asked Questions
Everything you need to know about our privacy-first, client-side execution model and offline PWA runtime.
Are my files, documents, or data uploaded to a server?▼
No. Every single utility on Manjurul operates 100% locally within your browser. Calculations, file conversions, PDF processing, and cryptographic operations run via client-side JavaScript, Web Workers, HTML5 Canvas, and WebAssembly. Your data never touches a remote server or cloud database.
Can I use these web tools offline without an internet connection?▼
Yes. Manjurul is engineered as an installable Progressive Web App (PWA). Once loaded in your browser or installed on your desktop or mobile device, our Service Worker caches all 52 utilities, allowing you to use them seamlessly anywhere without Wi-Fi or cellular data.
Are all 52 browser tools completely free to use?▼
Yes. All utilities are 100% free with no hidden charges, no premium paywalls, no usage limits, and no account registration or credit card required.
What categories of tools are available?▼
The platform provides utilities across 7 key disciplines: PDF manipulation (merge, split, compress, convert), image processing (converter, resizer, favicon generator, ASCII art), developer converters (JSON formatter, YAML-JSON, regex tester, code minifiers), health and mathematics calculators (BMI, Creatinine Clearance, Loan, Scientific), security (password and UUID generators, hash computation, JWT decoder), SEO utilities (robots.txt and XML sitemap generators), and focus timers (Pomodoro, stopwatch, interval timer).
How fast is in-browser processing compared to cloud tools?▼
Because all operations execute locally using your device's physical CPU and GPU hardware, there is zero network upload or download latency. Large PDFs, massive code files, and high-resolution images process near-instantaneously without waiting in cloud queues.
Which browsers and devices are supported?▼
Manjurul is compatible with all modern web browsers including Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge, and Chromium-based mobile browsers on Windows, macOS, Linux, iOS, and Android.
Popular Free Web Utilities
Quick access to our most frequently used document, image, and developer tools:
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Learn more about Manjurul