Free calculators, converters, and file tools that work in your browser.
Use HandyUtils for everyday date math, text cleanup, file conversion, JSON formatting, OCR, password generation, and more. Open a tool, enter your input, and get a result immediately.
38 tools available • no sign-up required • built for desktop and mobile
Start with common tasks
Use these groups when you already know the kind of work you need to do.
Dates and scheduling
Deadlines, ranges, timestamps, and time zones.
Text and writing
Count, transform, compare, and format text.
Files and documents
Move between images, PDFs, OCR, and structured data.
Data and developer tasks
Inspect JSON, hashes, regex, URLs, and IDs.
Browse all tools
Search by name or task, then scan the full list below.
38 tools in the directory
Find a tool
Search by tool name, file type, or the task you need to finish.
Start typing to narrow the list.
Date Calculator
Calculate days between dates, add or subtract days from any date
Number to Words
Convert numbers to written words in multiple formats
Percentage Calculator
Calculate percentages, increases, decreases, and more
Time Zone Converter
Convert times between different time zones worldwide
Unit Converter
Convert between length, weight, temperature, and more units
Word Counter
Count words, characters, sentences, and paragraphs in text
Case Converter
Convert text to uppercase, lowercase, title case, and more
Text Diff Checker
Compare two text blocks line by line and highlight additions, removals, and edits
Image to PDF
Combine one or more JPG, PNG, or WebP images into a downloadable PDF
SAT Solver
Solve Boolean satisfiability problems in CNF form with a browser-based DPLL solver
Chinese Remainder Theorem Solver
Solve modular congruence systems step by step with exact integer arithmetic
Matrix Calculator
Multiply matrices and perform transpose, determinant, inverse, addition, and subtraction
Encryption Tool
Encode, decode, encrypt, and decrypt text with Base64, AES-GCM, ROT13, and URL encoding
PDF to Image
Render PDF pages as high-quality PNG images directly in your browser
OCR Tool
Extract text from uploaded images or PDF pages with browser-side OCR
QR Code Generator & Scanner
Generate QR codes and scan QR images without sending files to a server
Scientific Calculator
Evaluate scientific expressions with trigonometry, powers, roots, constants, and logs
Equation Solver
Solve linear and quadratic equations and inspect the reduced polynomial form
Prime Checker & Factorization
Check if a number is prime and compute its prime factorization instantly
GCD & LCM Calculator
Find the greatest common divisor and least common multiple for several integers
Regex Tester
Test regular expressions, flags, matches, and replacement patterns live
JSON Formatter & Validator
Validate, prettify, minify, and inspect JSON documents in real time
CSV / Excel to JSON
Convert CSV files and Excel spreadsheets into clean JSON arrays
CSV Manipulator
Convert CSV to TSV, add or remove header rows, and control output quotes
Hash Generator & Verifier
Generate and verify SHA-256, SHA-1, SHA-512, and MD5 hashes
Timestamp Converter
Convert Unix timestamps to readable dates and turn dates back into timestamps
UUID Generator
Generate one or many RFC 4122 UUID v4 values and copy them in bulk
Markdown to HTML
Preview Markdown as HTML and inspect the generated markup instantly
Password Generator
Generate strong random passwords with custom length, symbols, and batch output
BMI Calculator
Calculate body mass index, category, and healthy weight range in metric or imperial units
Loan Calculator
Estimate monthly payment, total interest, and principal breakdown for fixed-rate loans
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK and inspect contrast-friendly text colors
Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs for layouts and mockups
Slug Generator
Turn titles and phrases into clean URL slugs with separator and length controls
URL Parser
Break any URL into protocol, host, path, query parameters, and fragment details
HTML Entity Encoder & Decoder
Encode reserved characters to HTML entities or decode entity strings back to plain text
Base Converter
Convert integers between binary, octal, decimal, hexadecimal, and base-36 formats
Roman Numeral Converter
Convert between Roman numerals and integers with validation for canonical notation
Date Calculator
Calculate days between dates, add or subtract days from any date
Number to Words
Convert numbers to written words in multiple formats
Percentage Calculator
Calculate percentages, increases, decreases, and more
Time Zone Converter
Convert times between different time zones worldwide
Unit Converter
Convert between length, weight, temperature, and more units
Word Counter
Count words, characters, sentences, and paragraphs in text
Case Converter
Convert text to uppercase, lowercase, title case, and more
Text Diff Checker
Compare two text blocks line by line and highlight additions, removals, and edits
Image to PDF
Combine one or more JPG, PNG, or WebP images into a downloadable PDF
SAT Solver
Solve Boolean satisfiability problems in CNF form with a browser-based DPLL solver
Chinese Remainder Theorem Solver
Solve modular congruence systems step by step with exact integer arithmetic
Matrix Calculator
Multiply matrices and perform transpose, determinant, inverse, addition, and subtraction
Encryption Tool
Encode, decode, encrypt, and decrypt text with Base64, AES-GCM, ROT13, and URL encoding
PDF to Image
Render PDF pages as high-quality PNG images directly in your browser
OCR Tool
Extract text from uploaded images or PDF pages with browser-side OCR
QR Code Generator & Scanner
Generate QR codes and scan QR images without sending files to a server
Scientific Calculator
Evaluate scientific expressions with trigonometry, powers, roots, constants, and logs
Equation Solver
Solve linear and quadratic equations and inspect the reduced polynomial form
Prime Checker & Factorization
Check if a number is prime and compute its prime factorization instantly
GCD & LCM Calculator
Find the greatest common divisor and least common multiple for several integers
Regex Tester
Test regular expressions, flags, matches, and replacement patterns live
JSON Formatter & Validator
Validate, prettify, minify, and inspect JSON documents in real time
CSV / Excel to JSON
Convert CSV files and Excel spreadsheets into clean JSON arrays
CSV Manipulator
Convert CSV to TSV, add or remove header rows, and control output quotes
Hash Generator & Verifier
Generate and verify SHA-256, SHA-1, SHA-512, and MD5 hashes
Timestamp Converter
Convert Unix timestamps to readable dates and turn dates back into timestamps
UUID Generator
Generate one or many RFC 4122 UUID v4 values and copy them in bulk
Markdown to HTML
Preview Markdown as HTML and inspect the generated markup instantly
Password Generator
Generate strong random passwords with custom length, symbols, and batch output
BMI Calculator
Calculate body mass index, category, and healthy weight range in metric or imperial units
Loan Calculator
Estimate monthly payment, total interest, and principal breakdown for fixed-rate loans
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK and inspect contrast-friendly text colors
Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs for layouts and mockups
Slug Generator
Turn titles and phrases into clean URL slugs with separator and length controls
URL Parser
Break any URL into protocol, host, path, query parameters, and fragment details
HTML Entity Encoder & Decoder
Encode reserved characters to HTML entities or decode entity strings back to plain text
Base Converter
Convert integers between binary, octal, decimal, hexadecimal, and base-36 formats
Roman Numeral Converter
Convert between Roman numerals and integers with validation for canonical notation
Built for quick one-off work
The homepage keeps the path from landing to result short.
Private by default
Most tool workflows run directly in the browser, so inputs stay on your device.
Fast to reach
The homepage is organized for direct entry: search, categories, and a full tool list.
Wide coverage
Use one site for calculators, converters, text utilities, and common file workflows.
Your Go-To Resource for Online Calculations
Welcome to HandyUtils.net, your trusted destination for free online calculators, converters, and browser-based utilities. Whether you need to calculate the number of days between two dates, format JSON, extract text from a PDF, generate a QR code, or solve a modular arithmetic problem, our tools are designed to make everyday tasks faster and simpler.
Our collection of utilities covers a wide range of everyday needs. The Date Calculator helps you determine the exact number of days, weeks, or months between any two dates, while the Number to Words Converter turns numbers into written form for checks, legal documents, or formal correspondence.
Need to work with percentages? Our Percentage Calculator handles common formulas and percentage changes. For scheduling across regions, the Time Zone Converter shows you the current time in cities around the world so you can coordinate calls and deadlines with less friction.
HandyUtils also includes file and workflow tools such as Image to PDF, PDF to Image, OCR Tool, Text Diff Checker, Regex Tester, JSON Formatter, UUID Generator, Hash Generator, and Markdown to HTML.
Built for Speed and Simplicity
Every tool is designed to load quickly and present the inputs and outputs clearly. Most calculations happen in the browser, which keeps the experience responsive and reduces the need to send data elsewhere.
Useful for Everyday Work
Students, developers, writers, analysts, and office teams use the site for fast one-off tasks: converting units, validating JSON, generating passwords, reformatting text, or working through math problems without opening heavier software.