Square Footage Calculator
Calculate square footage for rooms, floors, walls, and land. Supports rectangles, triangles, circles, and irregular shapes. Free and instant.
Percentage Calculator
Calculate percentages, percentage change, percentage difference, and more. Multiple calculation modes for everyday and professional use.
Age Calculator
Calculate exact age in years, months, days, hours, and minutes from any date. Find the difference between two dates instantly.
Base64 Decode
Decode Base64-encoded strings and files instantly in your browser. Supports standard and URL-safe Base64. No data sent to servers.
Base64 Encode
Encode text or files to Base64 format instantly. Supports standard and URL-safe Base64 encoding. Free and client-side.
URL Encode / Decode
URL encode and decode strings, query parameters, and full URLs. Handles all special characters and Unicode. Essential developer tool.
Password Strength Checker
Check the strength of any password instantly. Get detailed analysis, crack time estimates, and improvement suggestions. 100% client-side.
JSON Tools
Format, validate, minify, and convert JSON in your browser. Pretty-print messy JSON, spot syntax errors with line numbers, and switch between JSON, YAML, CSV, and XML.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 and other cryptographic hashes from any text or file. Useful for integrity checks, password hashing demos, and developer testing.
Word Counter
Count words, characters, sentences, paragraphs, and reading time as you type. Useful for essays, blog posts, social media captions, and SEO content.
Epoch / Unix Time Converter
Convert Unix timestamps to human-readable dates and back. Supports milliseconds, seconds, and time zone conversions. Essential for backend debugging and log analysis.
Text Repeat
Repeat any text or character N times with optional separators and newlines. Useful for testing, padding, formatting, and generating placeholder content.
Crontab Helper
Build and decode crontab expressions with plain-English explanations. Validate cron schedules before deploying. Includes a reference of common patterns.
Regex Guide
Build and test regular expressions with a reference library and live explanations. Covers JavaScript, Python, PCRE, and POSIX flavors with worked examples.
Unit Cheatsheet
Engineering and scientific unit reference — converters, cheat sheets, and printable charts for length, mass, temperature, energy, and more.
Hours Calculator
Free hours calculator with overtime and pay — for weekly timesheets, payroll, and freelance billing. Handles breaks, overnight shifts, and decimal hours.
Clock With Us
Online alarm clock, timer, stopwatch, world clock, and time zone converter — all browser-based. Set alarms that ring even with the tab in the background.
Margin vs Markup
Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax. Multi-product comparison included.
Dimensional Weight Calculator
Calculate billable (dimensional) shipping weight for FedEx, UPS, USPS, DHL and more carriers. Compare actual vs volumetric weight with current divisors.
Box Volume Calculator
Calculate the volume of a box from its length, width, and height in any units. For shipping, storage, and packaging planning.
Girth Calculator
Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness. Two calculators in one.
Solar Calculator
Free, unbiased solar and off-grid calculators — system sizing, savings and payback, battery banks, and country-specific incentive rules.
CIDR Calculator
Calculate, split, and visualize subnets from CIDR notation. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs, and Terraform export.
Subnet Mask Calculator
Network and broadcast addresses, usable host range, wildcard masks, and VLSM planning for IPv4 and IPv6. Cloud-aware, with a learn center.
Transform Case
Convert text between Title Case (AP, Chicago, APA, MLA), sentence case, camelCase, snake_case, kebab-case, and more, with side-by-side preview.
Picture Toolkit
Browser-based image tools — compress, convert, resize, crop, and watermark. JPG, PNG, WebP, AVIF, HEIC. Files never leave your device.
Remove Metadata
Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser, with a pre-strip inspector.
Everything you need for UUID generation, validation, and documentation
UUID v4 Generator
Cryptographically secure random UUIDs. The most widely used UUID version.
UUID v7 Generator
Sortable time-based UUIDs. RFC 9562 recommended for database primary keys.
Bulk UUID Generator
Generate up to 1,000 UUIDs at once in multiple formats. Download as text.
UUID Validator
Validate any UUID and identify its version, variant, and format compliance.