Web Dev Tools
Build and prototype web content with instant previews. From quick HTML experiments to production email templates.
🎨
HTML/CSS/JS Playground
Write HTML, CSS, and JavaScript with instant live preview. Perfect for prototyping and learning.
Live PreviewConsole OutputExternal LibrariesResponsive TestingAuto-SaveShare URL
Open HTML/CSS/JS
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MJML Email Editor
Create responsive email templates with MJML and export to HTML compatible with all email clients.
MJML SyntaxLive PreviewResponsiveEmail-Client SafeExport HTMLTemplates
Open MJML
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Base64 Encoder/Decoder
Encode text to Base64 and decode Base64 back to text. UTF-8 support, file encoding, and live conversion.
Encode & DecodeUTF-8 SupportLive ConversionFile EncodingCopy to Clipboard100% Private
Open Base64
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JWT Decoder
Paste a JSON Web Token to inspect its header and payload as pretty JSON, with exp/nbf/iat claim status. Runs entirely in your browser.
Header & PayloadPretty JSONExpiry ChecksAlg WarningsCopy to Clipboard100% Private
Open JWT
Write Code, See Results Instantly
HTML
CSS
JavaScript
<div class="card">
<h1>Hello World</h1>
<p>Welcome to the playground!</p>
<button onclick="sayHello()">
Click Me
</button>
</div>Hello World
Welcome to the playground!