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🛠️ Free Online Tools

Free Online Tools

A curated collection of free browser-based tools for developers, students, and everyday users. No signup, no tracking — everything runs in your browser.

📐
Calculator

Square Footage Calculator

Calculate square footage for rooms, floors, walls, and land. Supports rectangles, triangles, circles, and irregular shapes. Free and instant.

AreaReal EstateHome
💯
Calculator

Percentage Calculator

Calculate percentages, percentage change, percentage difference, and more. Multiple calculation modes for everyday and professional use.

MathFinanceStatistics
🎂
Calculator

Age Calculator

Calculate exact age in years, months, days, hours, and minutes from any date. Find the difference between two dates instantly.

DateTimeBirthday
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Encoder / Decoder

Base64 Decode

Decode Base64-encoded strings and files instantly in your browser. Supports standard and URL-safe Base64. No data sent to servers.

Base64EncodingDeveloper
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Encoder / Decoder

Base64 Encode

Encode text or files to Base64 format instantly. Supports standard and URL-safe Base64 encoding. Free and client-side.

Base64EncodingDeveloper
🔗
Encoder / Decoder

URL Encode / Decode

URL encode and decode strings, query parameters, and full URLs. Handles all special characters and Unicode. Essential developer tool.

URLEncodingDeveloper
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Security

Password Strength Checker

Check the strength of any password instantly. Get detailed analysis, crack time estimates, and improvement suggestions. 100% client-side.

PasswordSecurityPrivacy
{ }
Formatter / Validator

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.

JSONYAMLDeveloper
#️⃣
Cryptography

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.

HashSHA-256Developer
📝
Writing Tool

Word Counter

Count words, characters, sentences, paragraphs, and reading time as you type. Useful for essays, blog posts, social media captions, and SEO content.

WordsWritingSEO
⏱️
Developer Tool

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.

UnixTimestampDeveloper
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Writing Tool

Text Repeat

Repeat any text or character N times with optional separators and newlines. Useful for testing, padding, formatting, and generating placeholder content.

TextRepeatUtility
Developer Tool

Crontab Helper

Build and decode crontab expressions with plain-English explanations. Validate cron schedules before deploying. Includes a reference of common patterns.

CronSchedulerDevOps
/^$/
Developer Tool

Regex Guide

Build and test regular expressions with a reference library and live explanations. Covers JavaScript, Python, PCRE, and POSIX flavors with worked examples.

RegexPatternDeveloper
📏
Calculator

Unit Cheatsheet

Engineering and scientific unit reference — converters, cheat sheets, and printable charts for length, mass, temperature, energy, and more.

UnitsConversionReference
Calculator

Hours Calculator

Free hours calculator with overtime and pay — for weekly timesheets, payroll, and freelance billing. Handles breaks, overnight shifts, and decimal hours.

TimePayrollTimesheet
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Time Tool

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.

ClockAlarmTimer
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Calculator

Margin vs Markup

Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax. Multi-product comparison included.

PricingFinanceRetail
⚖️
Calculator

Dimensional Weight Calculator

Calculate billable (dimensional) shipping weight for FedEx, UPS, USPS, DHL and more carriers. Compare actual vs volumetric weight with current divisors.

ShippingLogisticsCarriers
📦
Calculator

Box Volume Calculator

Calculate the volume of a box from its length, width, and height in any units. For shipping, storage, and packaging planning.

VolumeShippingPacking
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Calculator

Girth Calculator

Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness. Two calculators in one.

ShippingFitnessMeasurement
☀️
Calculator

Solar Calculator

Free, unbiased solar and off-grid calculators — system sizing, savings and payback, battery banks, and country-specific incentive rules.

SolarEnergyOff-grid
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Developer Tool

CIDR Calculator

Calculate, split, and visualize subnets from CIDR notation. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs, and Terraform export.

CIDRSubnetNetworking
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Developer Tool

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.

SubnetNetworkingIP
🔤
Writing Tool

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.

TextCaseWriting
🖼️
Image Tool

Picture Toolkit

Browser-based image tools — compress, convert, resize, crop, and watermark. JPG, PNG, WebP, AVIF, HEIC. Files never leave your device.

ImageCompressConvert
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Privacy Tool

Remove Metadata

Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser, with a pre-strip inspector.

PrivacyEXIFMetadata
UUID Tools on UUIDCore

Everything you need for UUID generation, validation, and documentation