Square Footage Calculator
Instantly calculate the square footage of any room, floor, wall, or space. Perfect for home renovation, flooring, painting, and building projects.
Percentage Calculator
Calculate percentages instantly — find what percent one number is of another, calculate percentage increase or decrease, and more.
Age Calculator
Calculate your exact age in years, months, and days from your date of birth. Also find the difference between any two dates.
Hours Calculator
Add up work hours and minutes between times, build weekly timesheets, and compute overtime pay across 50+ time zones.
Margin vs Markup
Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax.
Dimensional Weight Calculator
Work out billable shipping weight for FedEx, UPS, USPS, DHL and more carriers, comparing actual vs volumetric weight.
Box Volume Calculator
Calculate the volume of a box from its length, width, and height in any units — for shipping, storage, and packing.
Girth Calculator
Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness tracking.
Unit Cheat Sheet
Engineering and scientific unit converter with printable reference tables — wire gauges, drill bits, pipe sizes, and more.
Solar Calculator
Free, unbiased solar and off-grid calculators — system sizing, savings and payback, and battery banks.
Base64 Decoder
Decode any Base64-encoded string back to plain text instantly. Supports standard Base64, URL-safe Base64, and file decoding — all in your browser.
Base64 Encoder
Encode any text, file, or data into Base64 format. Used by developers for encoding data in APIs, emails, HTML, and configuration files.
URL Encode & Decode
Encode special characters in URLs to make them safe for web use, or decode URL-encoded strings back to readable text. Essential for web developers.
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.
UUID Generator
Generate UUID v1, v4, and v7 identifiers in bulk for use in databases, APIs, distributed systems, and testing. Copy single UUIDs or batches with one click.
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 Time Converter
Convert between Unix epoch timestamps and human-readable dates. Supports seconds, milliseconds, and time zones.
Crontab Sheet
Build and decode cron expressions with plain-English explanations and the next run times for any schedule.
Regex Guide
Build, test, and debug regular expressions with token-by-token explanations, a pattern library, and code in 7 languages.
CIDR Calculator
Calculate, split, and visualize subnets. 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.
Text Repeater
Repeat any word, phrase, or emoji up to 100,000 times with custom separators and optional numbering.
Case Transformer
Convert text between Title Case, 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. Files never leave your device.
Remove Metadata
Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser.
Clock With Us
Online alarm clock, timer, stopwatch, and world clock that runs in your browser. Alarms ring even in a background tab.
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