Free Online Developer Tools

HTML Live Preview

Write HTML, CSS & JS with instant preview.

Markdown Editor

Live Markdown preview as you type.

Tailwind Playground

Try Tailwind CSS classes with live output.

SVG Editor

Edit SVG markup with instant render.

Email HTML Preview

Test how your email HTML renders.

Responsive Tester

Preview a page across device widths.

JSON Formatter

Beautify, validate & minify JSON.

HTML Beautifier

Format messy HTML cleanly.

CSS Beautifier

Pretty-print and tidy CSS.

JS Beautifier

Format JavaScript code.

XML Formatter

Pretty-print XML documents.

SQL Formatter

Format SQL queries readably.

YAML Formatter

Validate & pretty-print YAML.

HTML Minifier

Compress HTML for production.

CSS Minifier

Shrink stylesheet size.

JS Minifier

Minify JavaScript code.

JSON Minifier

Strip whitespace from JSON.

SVG Minifier

Optimize SVG files.

JSON to CSV

Convert JSON arrays to CSV.

CSV to JSON

Parse CSV into JSON.

JSON to XML

Transform JSON into XML.

XML to JSON

Transform XML into JSON.

JSON to YAML

Convert JSON to YAML.

YAML to JSON

Convert YAML to JSON.

HTML to Markdown

Strip HTML into Markdown.

Markdown to HTML

Render Markdown as HTML.

CSS to SCSS

Modernize CSS to SCSS.

HEX to RGB

Convert color values.

RGB to HEX

Convert color values.

Image to Base64

Encode images for inline use.

Base64 Encode/Decode

Standard Base64 conversion.

URL Encode/Decode

Percent-encode URL strings.

HTML Entity Encode

Escape special HTML chars.

JWT Decoder

Decode & inspect JWT tokens.

Hex ↔ Text

Convert hexadecimal to text.

Binary ↔ Text

Convert binary to text.

MD5 Generator

Generate MD5 hashes.

SHA-256 Generator

SHA-256 hashes in browser.

SHA-512 Generator

SHA-512 hashes in browser.

Bcrypt Generator

Hash passwords with bcrypt.

Password Generator

Strong random passwords.

UUID Generator

Generate v4 UUIDs.

Lorem Ipsum

Filler text generator.

QR Code Generator

Make QR codes from text/URLs.

Favicon Generator

Multi-size favicons from image.

Meta Tags Generator

SEO & social meta tags.

Open Graph Generator

Facebook & LinkedIn previews.

CSS Box Shadow

Visual shadow builder.

CSS Gradient

Visual gradient builder.

CSS Clip-Path

Shape clipping made visual.

Flexbox Generator

Visualize flex layouts.

CSS Grid Generator

Build grid layouts visually.

Border Radius

Round corners visually.

Regex Tester

Test regular expressions live.

JSON Validator

Validate JSON syntax.

Cron Tester

Decode cron expressions.

Email Validator

Check email format.

URL Parser

Break a URL into parts.

Word Counter

Words, chars, lines & reading time.

Case Converter

UPPER, lower, camelCase, snake_case.

Text Diff

Compare two pieces of text.

Remove Duplicate Lines

Deduplicate text lines.

Sort Lines

Sort text alphabetically.

Find & Replace

Bulk text replacement.

Markdown Table

Build Markdown tables visually.

Slug Generator

URL-friendly slugs from text.

Unix Timestamp Converter

Epoch ↔ human date.

Date Difference

Days/months/years between dates.

Time Zone Converter

Convert between time zones.

Age Calculator

Exact age from birthdate.

Countdown Timer

Set countdowns to events.

Color Picker

HEX, RGB, HSL, HSV, CMYK.

Palette Generator

Build harmonious palettes.

Contrast Checker

WCAG color contrast.

Color Shades

Tints & shades of any color.

EMI Calculator

Loan EMIs & amortization.

SIP Calculator

Mutual fund SIP returns.

GST Calculator

Add or remove GST quickly.

Percentage Calculator

All percentage operations.

Age Calculator

Years, months, days old.

BMI Calculator

Body mass index & range.