Client-Side Only Tools

A browser-based display toolkit that turns any screen into a LED sign, light effect, sound visualizer, clock, QR code, or camera filter. Supports dozens of themes and modes — no app, no account, just a URL.

A free online collage and image editing tool. No login required, completely free to use. Built entirely on the front end, ensuring absolute privacy and security for your images. Download high-resolution results with no watermarks. A clean and professional tool for creating beautiful visual works.

A URL-based time tool that lets you create countdowns, countups, clocks, and recurring cycles — all embedded in the link itself. No signup required, just craft your URL and share it. Supports multiple themes and time units.

Open-source FIRE retirement portfolio simulator that runs your plan against 150+ years of historical US market data. Configure portfolio size, annual spending, asset allocation, withdrawal strategies, Social Security income, and more to see what percentage of historical scenarios your retirement survives.

A collection of 40+ free, browser-based color tools and SVG generators for creating backgrounds, patterns, textures, gradients, and shapes. Each tool works directly in the browser with zero signup required. Perfect for web designers and developers who need custom visuals without opening heavy design software.

A browser-based debugger for JSON Web Tokens. Paste any JWT to instantly decode its header, payload, and signature. Verify token signatures with your secret or public key. Supports HS256, RS256, ES256, and other common algorithms — all processing happens in your browser with no account required.

Datasette running entirely in your browser via WebAssembly (Pyodide). Upload SQLite databases or CSV files and explore them with a full SQL interface — no server, no account, and your data never leaves your device. Built on the popular Datasette data exploration framework by Simon Willison.

Virtual whiteboard for sketching hand-drawn like diagrams. Supports real-time collaboration, export to PNG/SVG, and has a library of shapes and icons.

Advanced online image editor that supports PSD, XCF, Sketch, XD, and CDR formats. Works like Photoshop directly in your browser with layers, filters, and advanced editing tools.

Writing assistant that highlights complex sentences, passive voice, adverbs, and hard-to-read phrases. Helps make your writing bold and clear.

Online regex tester and debugger for PHP, PCRE, Python, Golang, and JavaScript. Build, test, and debug regex patterns with real-time explanation and match highlighting.

Up-to-date browser support tables for web technologies including HTML5, CSS3, SVG, and JavaScript APIs. Essential reference for web developers.

Create and share beautiful images of your source code. Choose from dozens of syntax themes, languages, and export to PNG or SVG.

Customizable Pomodoro timer that works on desktop and mobile. Track your focus sessions, set custom durations, and manage tasks with a clean interface.

Collection of over 3,000 free calculators for math, physics, finance, health, and everyday life. Each calculator explains the formulas and concepts behind it.

Convert between table formats: Excel, CSV, JSON, HTML, SQL, Markdown, LaTeX, and more. Edit tables visually and export in your preferred format.

Advanced graphing calculator implemented as an interactive web application. Plot functions, create tables, add sliders, animate graphs, and explore math visually.

Generate harmonious color palettes instantly. Press spacebar to create beautiful color schemes for your design projects.

Optimize and compress SVG files with a visual interface. Built by Jake Archibald, powered by SVGO.

The Cyber Swiss Army Knife — encode, decode, encrypt, compress, and analyze data with a drag-and-drop recipe builder.

Visual cron expression editor with human-readable explanations. Quickly build and validate cron schedules.

Create hand-drawn style presentation slides using the Excalidraw engine. Build unique, sketch-like slide decks.

Comprehensive browser fingerprinting test suite. Check what information your browser reveals: IP, WebRTC, Canvas, fonts, and more.

Learn CSS Grid layout by tending a virtual garden. Water your carrots through 28 progressively challenging levels.

Beautiful personal finance calculators for retirement, investment, mortgage, and budgeting. Interactive visualizations with no data collection.

Create flowcharts, sequence diagrams, Gantt charts, and more using simple text syntax. Live preview with export to SVG/PNG.

Check HTML and CSS support across email clients. Like Can I Use, but for email — know what works in Gmail, Outlook, Apple Mail, and more.

Preview and generate social media meta tags. See how your page looks on Google, Facebook, Twitter, LinkedIn, and more.

Generate unique SVG background shapes — waves, blobs, gradients, stacks, and more. Export as SVG or PNG for your designs.

Visual CSS gradient generator with a beautiful UI. Create linear, radial, and conic gradients with instant code output.

Visual neumorphism CSS generator. Adjust size, radius, distance, intensity, and color to create soft UI shadow effects.

Generate Tailwind CSS color scales from any color. Get a complete 50–950 shade palette with one click, ready for your config.

Minimal distraction-free writing environment. Just open and start writing — no toolbar clutter, no distractions.

Animated visualizations of data structures and algorithms. Step through sorting, graph traversal, tree operations, and more at your own pace.

Learn SQL by solving a murder mystery. Use SELECT, JOIN, WHERE, and more to query the database and catch the killer.

Watch sorting algorithms in action with animated bar charts. Compare bubble sort, quicksort, merge sort, and more side by side.

Open-source data visualization framework. Paste your data, choose a chart type, and export beautiful visualizations as SVG or PNG.

Multi-format code and data transformer. Convert between JSON, YAML, CSV, TypeScript, GraphQL, and many more formats instantly.

Convert Markdown to interactive mind maps. Write structured Markdown and see it transform into a zoomable, navigable tree visualization.

Collection of ready-to-use CSS animations. Preview, customize timing and easing, then copy the generated CSS code.

Cut and trim audio files online. Support for MP3, WAV, OGG, and 300+ formats — process files directly in the browser.

Curated ambient and electronic music mixes designed to aid concentration while programming. 60+ episodes of focus music.

One-click copy for special characters, symbols, and emoji. Browse categories or search — click any character to copy it instantly.

End-to-end encrypted file transfer up to 10 GB. Files are encrypted in the browser before upload — no one else can read them.

Interactive neural network visualization in the browser. Experiment with layers, neurons, activation functions, and learning rates to understand how neural networks learn.

Kuakua.app is your AI-powered hub for mental health resources, mindfulness meditation, and positive psychology games. Take science-backed quizzes, play brain-boosting tasks, and unlock daily affirmations to feel happier, calmer, and more resilient—anytime, on any device.

Free browser-based science and math simulations from the University of Colorado Boulder. Over 150 interactive HTML5 simulations covering physics, chemistry, biology, earth science, and math — all usable directly in the browser with no account required.

Open-source browser-based audio editor with waveform visualization, cut/copy/paste editing, and effects including normalize, fade in/out, reverse, and amplify. Processes audio entirely in your browser — no uploads to any server.

A browser-based file encryption and decryption tool that works entirely client-side. hat.sh uses AES-256-GCM encryption with either a password or public/private key pair. Files never leave your browser — no uploads, no servers, no accounts.

A collaborative digital whiteboard with a clean, minimal interface. Draw freehand, add shapes, arrows, text, and sticky notes to create diagrams and visual notes.

Google-built image compression tool that runs entirely in the browser. Compare original vs compressed side-by-side, supports WebP, AVIF, MozJPEG, and more.

Cloud-enabled, mobile-ready, offline-storage compatible Markdown editor. Preview rendered Markdown in real-time as you type.

Combines multiple API documentations in a fast, organized, and searchable interface. Covers JavaScript, HTML, CSS, Node.js, Ruby, Python, and hundreds more.

Online JSON formatter, validator, and viewer. Paste or upload JSON data to format, validate, minify, and convert between JSON and other formats.

Free and easy-to-use online PDF tools: merge, split, compress, convert, rotate, watermark, and more. All processing happens in the browser.

Open-source tests of web browser privacy. Compares tracking protection, fingerprinting resistance, and other privacy features across major browsers.

Online tool for converting between CSV, JSON, and SQL formats. Also includes data cleaning and transformation utilities. All processing happens in the browser.

Visualize JSON data into interactive graphs. Seamlessly explore complex JSON structures with a tree-like graph view, search, and filter capabilities.

Free dynamic mathematics software for all levels of education. Combine geometry, algebra, spreadsheets, graphing, statistics, and calculus in one interactive tool.

Official SEC compound interest calculator. Estimate how your savings or investments could grow over time with compound interest. Simple, trustworthy, no ads.

Write, compile, and run TypeScript code in the browser. Official Microsoft tool with full type checking and IntelliSense.

Create beautiful code screenshots with customizable themes, backgrounds, and padding. By Raycast.

Visual time zone converter for scheduling across time zones. Compare multiple cities side by side to find the best meeting time.

Learn CSS Flexbox through a fun frog-themed game. Complete 24 levels to master flexbox properties like justify-content and align-items.

Open-source API development ecosystem. Test REST, GraphQL, WebSocket, and more — a lightweight Postman alternative.

Visualize and explore Abstract Syntax Trees for many languages and parsers. Essential tool for compiler and tooling development.

Preview Prettier code formatting results online. Experiment with options and see formatted output for JavaScript, TypeScript, CSS, and more.

Generate beautiful SVG wave shapes for section dividers. Customize layers, colors, and complexity with a simple UI.

Preview color palettes on a real page layout in real time. See exactly how your colors look on text, buttons, and backgrounds.

Visual type scale calculator for building harmonious typography. Choose a base size, scale ratio, and preview your type hierarchy.

Color palette inspiration with real-world context. See how color schemes look applied to an actual website layout, not just swatches.

Visual CSS cubic-bezier timing function editor. Drag control points to create custom easing curves and compare with presets.

Full-featured in-browser Markdown editor. Sync with Google Drive and GitHub, live preview, scroll sync, and offline support.

Minimalist, customizable typing speed test. Track WPM, accuracy, and consistency with multiple test modes and themes.

Learn CSS selectors by playing a dinner-themed game. Complete 32 levels from basic selectors to advanced pseudo-classes.

Interactive regex tutorial with step-by-step lessons. Learn regular expressions from basic patterns to advanced lookaheads.

Create, edit, and visualize GeoJSON data on an interactive map. Draw points, lines, and polygons with instant code output.

Apply glitch effects to images and videos. 27 mosh effects including pixel sort, RGB shift, jitter, and VHS — all in the browser.

Financial independence retirement calculator. Simulate withdrawal strategies with historical market data and Monte Carlo analysis.

Offline-first personal budget manager inspired by YNAB. Envelope budgeting with automatic sync — all data stays on your device.

Google's no-code tool for training machine learning models in the browser. Train image, sound, or pose recognition models with your own data, all processed client-side.

A simple yet powerful Chrome extension that helps you extract and export cookies from any website with just one click.

This is a tool website forked from it-tools, containing 100+ tools.

Fast, web-based, JavaScript-driven SVG drawing editor. Create and edit SVG images directly in the browser with a familiar drawing application interface.