kelvin.run

Tools

Client-side utilities that run in your browser. Fast, private, and designed for flow.

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Color Shades
Generate clean tints & shades from any color.
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Gradient Gen
Build and copy beautiful CSS gradients.
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Base64 Tool
Encode and decode text safely (UTF-8 aware).
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JSON Formatter
Format, validate, and minify JSON (with helpful errors).
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JWT Decoder
Decode JWTs and inspect header/payload timestamps.
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QR Code Generator
Generate QR codes as PNG + SVG (offline).
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JPG โ†’ SVG
Vectorize an image in the browser.
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JPG/PNG โ†’ WebP
Convert and optimize images into WebP.
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Favicon Pack
Generate favicon + app icons (web, Android, iOS).
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Theme Gen
Create CSS variables for a quick theme.
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Typing Test
Test WPM, accuracy, and consistency.
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Key Events
Inspect key events for shortcuts & games.