Free Online Tools for Everyone
ToolAstra offers 55+ powerful calculators and converters for crypto trading, AI content creation & detection, financial planning, health & fitness, document management, and developer utilities. All tools are 100% free, privacy-first, and work instantly in your browser.
🪙 Crypto & Trading Tools
Professional-grade cryptocurrency calculators for traders, investors, and HODLers. Calculate profits, estimate taxes, track prices, and plan your DCA strategy with precision.
💱 Crypto Converter
Convert BTC, ETH, USDT & 100+ altcoins to USD, INR, EUR, GBP, AED instantly. Live rates, no API needed.
₿ Bitcoin USD/INR Converter
Quick BTC to USD, INR, EUR, GBP, AED conversion. Perfect for quick value checks and payments.
📊 Crypto Price Tracker
Live cryptocurrency prices with auto-refresh. Track Bitcoin, Ethereum, and top 100 coins in real-time.
📈 Crypto Profit Calculator
Calculate trading profit/loss and ROI percentage. Track your gains, losses, and breakeven points easily.
📋 Crypto Tax Estimator
Estimate capital gains tax on crypto trades. Supports India, USA, Europe and worldwide tax calculations.
💰 DCA Calculator
Calculate Dollar-Cost Averaging returns. See your average buy price and total returns from regular investments.
🏦 Staking Rewards Calculator
Calculate annual and monthly staking APY returns. Plan your passive income from crypto staking.
⛽ ETH Gas Fee Estimator
Estimate Ethereum network gas fees in Gwei. Calculate transaction costs in USD and INR instantly.
🤖 AI Content & Detection Tools
AI-powered tools for content creators, social media managers, and marketers. Detect AI-generated content, generate professional image prompts, create captions, hashtags, and access top AI platforms instantly.
🔍 AI Content Detector New
Free AI checker to instantly detect AI-generated text from ChatGPT, GPT-5, Gemini, Claude & more. Analyzes perplexity, burstiness & sentence variation. 100% free, no signup.
📌 Pinterest Hashtag Generator New
Generate trending Pinterest hashtags that drive traffic, boost pin visibility, increase saves & grow your account. Best for bloggers & creators.
🖼️ AI Image Prompt Generator New
Free AI image prompt generator for Midjourney, DALL-E 3, Stable Diffusion & Google Gemini. 20+ art styles, copy & paste ready prompts with model-specific optimization.
✨ AI Caption Generator
Generate viral Instagram, Pinterest & YouTube captions instantly. Multiple tones, platform-optimized with hashtags.
#️⃣ AI Hashtag Generator
Create trending hashtags for Instagram, TikTok, YouTube & Pinterest. Boost reach and engagement instantly.
🧠 Claude AI Access
Quick access to Claude AI by Anthropic. Chat with one of the most advanced AI assistants available.
✍️ Copy AI Tool
AI-powered copywriting assistant for marketing content, ads, emails, and social media posts.
📝 Notion AI
Access Notion AI features for writing, summarizing, and organizing your notes and documents.
🔎 Perplexity AI
AI-powered search engine that provides accurate answers with sources. Research made easy.
💵 Financial Calculators
Complete suite of financial calculators for personal finance, investments, loans, and business planning. Make informed financial decisions.
📊 SIP Calculator
Calculate returns on Systematic Investment Plans. Plan your mutual fund investments with accurate projections.
🏠 EMI Calculator
Calculate loan EMI for home, car, personal loans. See amortization schedule and total interest payable.
📈 Compound Interest Calculator
Calculate compound interest on investments. See how your money grows over time with compounding.
🧾 GST Calculator
Calculate GST amount and total price. Supports all GST rates for India. Add or remove GST easily.
💱 Currency Converter
Convert between 150+ world currencies. Live exchange rates for USD, EUR, INR, GBP, JPY and more.
% Percentage Calculator
Calculate percentages, percentage increase/decrease, and discounts. Quick and accurate results.
⚖️ Break-Even Calculator
Calculate break-even point for your business. Know when you'll start making profit.
💰 AdSense Earnings Calculator
Estimate Google AdSense revenue. Calculate RPM, CTR, and monthly earnings for your website.
❤️ Health & Fitness Tools
Complete suite of health and fitness calculators. Track your BMI, calculate daily water intake, check body fat percentage, measure waist-hip ratio, and plan your daily macros for weight loss or muscle gain.
📏 BMI Calculator
Calculate Body Mass Index instantly. Know your health category and ideal weight range.
⚖️ Ideal Weight Calculator New
Calculate ideal body weight in kg using medical formulas (Devine, Robinson, Miller) for men & women.
💧 Water Intake Calculator New
Calculate daily water needs by weight, age, activity level, climate & special conditions.
📊 Body Fat Calculator New
Calculate body fat % using US Navy Method or BMI. Track lean body mass and fat mass.
📐 Waist-Hip Ratio New
Calculate WHR, check health risk, and classify body shape (Apple, Pear, Hourglass).
🥗 Macro Calculator New
Calculate daily macros (protein, carbs, fat) for weight loss, muscle gain, or keto diet.
🔥 BMR Calculator
Calculate Basal Metabolic Rate and TDEE. Find your daily calorie needs.
🍎 Calorie Calculator
Calculate daily calories based on your goals: weight loss, maintenance, or muscle gain.
🎂 Age Calculator
Calculate exact age in years, months, and days. Perfect for forms, exams, and official documents.
📅 Date Difference Calculator
Calculate days between two dates. Perfect for planning, countdowns, and duration calculations.
📄 Document & Image Tools
📦 PDF Compressor
Reduce PDF file size without losing quality. Perfect for email attachments and uploads.
🖼️ Image to PDF Converter
Convert JPG, PNG images to PDF. Create multi-page PDFs from photos and scans.
🖼️ Image Compressor
Compress images online without quality loss. Reduce file size for web and social media.
💻 Developer Tools
🔐 Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text. 100% client-side, secure and fast.
{} JSON Formatter
Format, validate, and beautify JSON. Minify JSON and check for syntax errors.
🔗 URL Encoder/Decoder
Encode or decode URLs instantly. Convert special characters to URL-safe format.
📱 QR Code Generator
Create custom QR codes for URLs, text, WiFi, and more. Download as PNG instantly.
🔑 Password Generator
Generate strong, secure passwords. Customizable length and character types.
📝 Word Counter
Count words, characters, sentences, and paragraphs. Perfect for writers and students.
📋 Compare Text
Compare two text files or strings. Find differences and similarities instantly.
🔊 Text to Speech
Convert text to natural-sounding speech. Multiple voices and languages supported.
📐 Unit Converter
Convert between 100+ units. Length, weight, temperature, volume, and more.
🎬 YouTube Thumbnail Downloader
Download YouTube video thumbnails in HD, SD, and max resolution. Free and fast.
🌟 Why Choose ToolAstra?
- 100% Free Forever: No hidden fees, no premium plans, no credit card required
- Privacy-First: All calculations happen in your browser. We don't store or track your data
- No Signup Required: Start using any tool instantly without creating an account
- Mobile Optimized: Works perfectly on smartphones, tablets, and desktops
- Offline Capable: Most tools work without internet connection once loaded
- Regular Updates: New tools added monthly based on user requests — latest: Pinterest Hashtag Generator, AI Content Detector, AI Image Prompt Generator, Macro Calculator, Body Fat Calculator, Waist-Hip Ratio, Water Intake & Ideal Weight
- Global Support: Serving users in 40+ countries with multi-currency support
Frequently Asked Questions
🆕 Try Our New Tools Today!
Don't miss our latest additions — Pinterest Hashtag Generator, AI Content Detector, AI Image Prompt Generator, Macro Calculator, Body Fat Calculator, and more — all completely free and ready to use right now. Plus 49+ more tools for crypto, finance, productivity & development.
📋 View All 55+ Tools