Your all-in-one hub for finance calculators, text tools, PDF & image tools, developer tools, and audio & video utilities—optimized for speed, accuracy, and completely free to use. No signup required.
Choose from our comprehensive suite of tools designed to simplify your daily tasks
EMI, SIP, Tax calculators and more for smart financial planning
Word counter, case converter, text compare, TTS, STT and more
Merge, split, convert PDF to JPG, JPG to PDF and compress
Compress, resize, convert images and more—all in your browser
JSON formatter, CSV/JSON convert, SQL & code formatter, minifiers, regex, UUID
Extract audio from video and more—client-side, no upload
Browse all the free online tools available on Smart Tool Book: finance calculators, text tools, PDF & image tools, developer tools, and audio & video tools. All run in your browser—no signup required.
Finance calculators: EMI Calculator, SIP Calculator, Income Tax Calculator, Loan Eligibility Checker, GST Calculator, FD Calculator, RD Calculator, PPF Calculator, Lumpsum Calculator, Percentage Calculator, Discount Calculator.
Text tools: Word Counter, Character Counter, Case Converter, Remove Duplicate Lines, Text Compare (Diff), Text to Speech, Speech to Text, Lorem Ipsum Generator, Text Reverser, Line Sorter Tool.
Developer tools: JSON Formatter, JSON to CSV, CSV to JSON, SQL Formatter, Code Formatter, HTML/CSS/JS Minifier & Formatter, Regex Tester, UUID Generator, Password Strength Checker, Password Generator, QR Code Generator, Base64 Encode / Decode.
PDF & document tools: PDF to JPG, JPG to PDF, Merge PDF, Split PDF, PDF Compressor.
Image tools: Image Compressor, Image Resizer and more. Audio & video: Extract Audio from Video.
Most popular tools among our users
Calculate your monthly loan payments with our easy-to-use EMI calculator
Plan your investments and calculate returns on systematic investment plans
Count words, characters, sentences and paragraphs in your text
Test your password security and get recommendations for improvement
Reduce image file size without losing quality for faster web performance