CalcHive
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The Hive of Free Online Tools

Encoders, formatters, generators, converters, and calculators — all free, all instant, all private. Buzz in, get results.

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Popular Tools

Base64 Encode & Decode
Popular
Encode and decode Base64 strings
URL Encode & Decode
Popular
Encode and decode URL/percent-encoded strings
JSON Formatter & Beautifier
Popular
Format, beautify, and validate JSON
UUID Generator
Popular
Generate random UUID v4 identifiers
Password Generator
Popular
Generate secure random passwords
MD5 Hash Generator
Popular
Generate MD5 hash from text
SHA-256 Hash Generator
Popular
Generate SHA-256 hash from text
Unix Timestamp Converter
Popular
Convert Unix timestamps to dates
JWT Decode & Inspect
Popular
Decode and inspect JWT tokens
QR Code Generator
Popular
Generate QR codes from text or URLs
JSON to YAML Converter
Popular
Convert between JSON and YAML formats
Number Base Converter
Popular
Convert between binary, octal, decimal, hex
Color Converter
Popular
Convert between HEX, RGB, HSL, CMYK
Regex Tester & Debugger
Popular
Test and debug regular expressions
Percentage Calculator
Popular
Calculate percentages and changes
Case Converter
Popular
Convert text between different cases
Image Format Converter
Popular
Convert between PNG, JPG, and WebP
HEIC to JPG/PNG Converter
Popular
Convert iPhone HEIC photos to JPG/PNG
Image Compressor
Popular
Compress images to reduce file size
Merge PDF
Popular
Combine multiple PDFs into one
Compress PDF
Popular
Reduce PDF file size
JPG to PDF Converter
Popular
Convert images to PDF
PDF to Image Converter
Popular
Convert PDF pages to JPG/PNG images
JSON Validator
Popular
Validate and debug JSON syntax
URL Parser & Analyzer
Popular
Parse URLs into their components
Cron Expression Parser
Popular
Parse cron expressions to plain English
Word & Character Counter
Popular
Count words, characters, and more

Browse by Category

Encoding & Decoding
Encode and decode data in various formats including Base64, URL, HTML entities, and more.
Formatters & Beautifiers
Format, beautify, and minify code in JSON, XML, SQL, HTML, CSS, JavaScript, and more.
Generators
Generate UUIDs, passwords, random strings, lorem ipsum, QR codes, and more.
Hash & Crypto
Generate hashes (MD5, SHA), encrypt and decrypt data, and work with cryptographic tools.
Developer Converters
Convert between JSON, YAML, XML, CSV, TypeScript interfaces, and more.
Number & Color Converters
Convert between number bases, color formats, file sizes, and more.
Text Tools
Count words, convert case, compare text, sort lines, find and replace, and more.
Regex Tools
Test, debug, and learn regular expressions with interactive tools.
Date & Time
Convert timestamps, calculate date differences, parse cron expressions, and more.
Math & Science
Scientific calculator, statistics, percentage calculator, matrix operations, and more.
Image & Media
Resize images, convert formats, generate Base64, pick colors, and more.
Validators
Validate JSON, XML, YAML, emails, URLs, credit cards, and more.
Network & Web
Parse URLs, calculate subnets, look up HTTP status codes, and more.
Utilities
Diff checker, chmod calculator, cron parser, and other handy utilities.

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All processing happens client-side in your browser. Your data is never sent to any server.

Always Free

No sign-up, no limits, no paywalls. Every tool is completely free to use, forever.