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Essential calculators, developer utilities, text engines, and AI applications that execute directly in your browser. Fast, private, and zero signup.
Listen as words are sounded out. Auto-repeats until typed correctly, then instantly advances. Build typing speed and ear training with 100% private in-browser voice synthesis.
Compute values instantly without leaving the homepage:
Generate and copy RFC 4122 compliant UUID v4 with WebCrypto:
Tokens, JSON documents, calculation parameters, and text notes never leave your device. All utilities operate at < 15ms response times using optimized WebAssembly and local JavaScript.
Calculate the average (mean) of any set of numbers instantly. Free online average calculator — enter numbers and get the result.
Calculate any percentage instantly.
Calculate exact age from date of birth.
Calculate loan EMI with formula.
Calculate the average of any numbers.
Full scientific calculator in your browser.
Calculate semester or cumulative CGPA and percentage.
Convert length, mass, temp, volume, speed, and storage units.
Calculate Body Mass Index and healthy weight range.
Calculate tip amounts and split bills between people.
Calculate sale prices, discounts, and sales tax.
Count words, characters, and sentences.
Count characters with and without spaces.
Convert text case instantly.
Remove duplicate lines from text.
Generate placeholder dummy text by words, sentences, or paragraphs.
Live split-pane Markdown editor and HTML renderer.
Compare two text blocks to inspect additions and deletions.
Generate cool fancy fonts and stylish gaming names.
Format and beautify JSON instantly.
Validate JSON and find errors instantly.
Encode and decode Base64 instantly.
Generate random UUIDs instantly.
Decode and inspect JWT headers, payload claims, and expiration.
Convert Unix epoch timestamps to UTC, local dates, and ISO 8601.
Convert HEX, RGB, HSL, and CMYK colors with WCAG contrast.
Test regular expressions with live match highlighting and flags.
Generate secure random passwords.
Generate QR codes for URLs and text.
Scan QR codes via camera or photo upload.
Test multi-touch, screen pixels, speakers, and specs.
Convert speech to text notes in real-time.
Listen to spoken words and test your typing speed.
Clinical AI symptom triage and urgency stratification.
Multi-language static code analyzer & security auditor.
ATS match rate optimizer & resume generator.
Metabolic health predictor with SHAP explainability.
Executive summaries and action items from transcripts.
Real-time stock terminal & AI market sentiment.
Vector branding platform & SVG logo creator.
Personal finance coach & budget pacing forecaster.
GitHub portfolio auditor & developer impact score.
Cold email generator & subject line open-rate predictor.
Production prompt engineering terminal & optimizer.
Radiology diagnostic assistant with GradCAM heatmaps.
Technical coding interview coach & Big-O analyzer.
Retirement Monte Carlo simulation & asset allocation.
Spaced repetition flashcards with SM-2 algorithm.
On-page SEO auditor with Google E-E-A-T scoring.
Cloud topology designer & AWS/GCP cost calculator.
Kanban job application pipeline & salary analytics.
CBT cognitive reframing journal & emotional tracker.
Vector infinite canvas for system architecture diagrams.
Personalized TDEE macro meal planner & grocery list.
High-throughput API load tester with p99 latency meters.
Contract risk auditor & legal clause detector.
Unified IoT control platform & energy optimizer.
Trending GitHub repository radar & tech stack intelligence.
Viral social hook generator & LinkedIn carousel maker.
Drug interaction checker & medication adherence scheduler.
Natural language SQL builder & query plan explainer.
Three.js WebGL 3D point cloud & cluster visualizer.
DevOps incident response & SRE outage triage.
Multi-tenant AI SaaS starter kit with Stripe billing.
Calculate investment growth over time.
Add or remove GST from any amount.
Calculate daily caloric needs.
Plan and forecast retirement savings.
Estimate body fat percentage.
Encode or decode URLs quickly.
Generate URL-friendly slugs from text.
Encode and decode HTML characters.
Repeat text multiple times instantly.
Estimate reading time for any text.
Convert numbers to English words.
Minify CSS code quickly.
Generate SHA-256, SHA-1 and DJB2 hashes.
Generate harmonious color palettes.
Beautify and format SQL queries.
Convert between YAML and JSON.
Time management for focused work.
Generate professional invoices fast.
Find out how much meetings cost.
Track daily habits and streaks.
Client-side image compressor.
Client-side image format converter.
Client-side SVG to PNG converter.
Instant parameter simulation and zero-latency client evaluation
[ToolsHub Studio v3.5 Initialized] Tool Loaded: Percentage Calculator Zero-latency client sandbox ready. Press 'Execute Sandbox Run' or choose a verified test case.
Most frequently used online tools across all categories
Calculate any percentage instantly.
Calculate semester or cumulative CGPA and percentage.
Format and beautify JSON instantly.
Count words, characters, and sentences.
Generate secure random passwords.
Generate QR codes for URLs and text.
Specialized production AI tools for healthcare, software security, DevOps, and SaaS architecture
Clinical AI symptom triage and urgency stratification.
Multi-language static code analyzer & security auditor.
Multi-tenant AI SaaS starter kit with Stripe billing.
On-page SEO auditor with Google E-E-A-T scoring.
Production prompt engineering terminal & optimizer.
Three.js WebGL 3D point cloud & cluster visualizer.
Find the exact tool you need organized into logical problem domains
We built ToolsHub Pro to replace slow, ad-heavy tool websites with a fast, private, and respectful alternative.
Client tools run entirely in your browser using WebAssembly and Web Crypto. Your sensitive logs, tokens, and calculations never touch our servers.
No server round trips for calculations. Results appear instantly as you type with real-time validation and zero latency.
Open access for everyone. No sign-up walls, no cookies tracking you across the web, and no ads cluttering your workspace.
Learn the formulas, math, and concepts behind our tools
A developer's guide to Base64 encoding — how the algorithm works, its 33% size overhead, and when to use standard vs URL-safe Base64.
A quick guide on how to figure out GST amounts for your invoices, whether you need to add it on or extract it from a total.
Learn the differences between YAML and JSON, and how to convert configuration files securely without server-side processing.