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Free Online Tools

Developer utilities that run entirely in your browser. No data leaves your device.

💻

Developer

{ }

JSON Formatter

Format, validate and minify JSON instantly.

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URL

URL Encoder / Decoder

Encode and decode URLs with UTF-8 support.

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ts

Timestamp Converter

Convert Unix timestamps to readable dates and back.

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64

Base64 Encoder / Decoder

Encode and decode Base64 strings instantly.

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JWT

JWT Decoder

Decode and inspect JSON Web Tokens.

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.*

Regex Tester

Test regular expressions with live match highlighting.

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01

Number Base Converter

Convert between binary, octal, decimal and hexadecimal.

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&

HTML Entity Encoder

Encode and decode HTML entities like & < >.

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*/5

Cron Expression Parser

Parse cron expressions and preview next execution times.

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755

Chmod Calculator

Convert Unix file permissions between rwx and numeric notation.

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px

CSS Unit Converter

Convert between px, rem, em, vw and pt units.

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◈

SVG to Data URI

Convert SVG code to Base64 Data URI for use in CSS.

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📝

Text

W#

Word Counter

Count words, characters, lines and estimate reading time.

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Aa

Case Converter

Convert text between camelCase, snake_case, UPPER, Title and more.

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Li

Lorem Ipsum Generator

Generate placeholder text with custom paragraph and word count.

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+/-

Text Diff

Compare two texts and highlight the differences.

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MD

Markdown Preview

Write Markdown and see the rendered HTML preview in real time.

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slug

Slug Generator

Convert any text to a URL-friendly slug.

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🔧

Math

cm

Unit Converter

Convert length, weight, temperature and area units.

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%

Percentage Calculator

Calculate percentages, increases and decreases instantly.

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XIV

Roman Numeral Converter

Convert between Arabic numbers and Roman numerals.

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Age

Age Calculator

Calculate exact age in years, months and days from a birthdate.

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Tip

Tip Calculator

Calculate tip amount and split the bill between any number of people.

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BMI

BMI Calculator

Calculate Body Mass Index with metric and imperial units.

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Security

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Password Generator

Generate strong random passwords with custom rules.

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#

Hash Generator

Generate SHA-256, SHA-512 and SHA-1 hashes from any text.

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⬡

UUID Generator

Generate UUID v4 identifiers. Bulk generation supported.

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Design

HEX

Color Picker & Converter

Pick colors and convert between HEX, RGB and HSL.

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A/a

Contrast Checker

Check color contrast ratio and WCAG AA/AAA compliance.

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□

CSS Shadow Generator

Visually build box-shadow and copy the CSS instantly.

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▤

CSS Gradient Generator

Generate linear and radial CSS gradients visually.

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▢

Border Radius Generator

Visually build CSS border-radius with live preview and copy.

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◫

Tint & Shade Generator

Generate tints and shades from any color for design systems.

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🔧

Utilities

QR

QR Code Generator

Generate QR codes from any text or URL. Download as PNG.

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0:00

Countdown Timer

Set a countdown timer with alarm. Runs entirely in your browser.

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LAP

Stopwatch

Precision stopwatch with lap times. Runs entirely in your browser.

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More tools coming soon

Base64 encoder, URL encoder, diff checker, color picker and more.