What color format does this accept?

A standard 6-digit hex color, with or without a leading #, like #3366ff or 3366ff. Shorthand 3-digit hex and named colors aren't supported.

Is the generated image transparent?

No, every pixel is fully opaque (alpha 255); use the Empty PNG Creator's transparent mode if you need a see-through image instead.

What sizes can I generate?

Any width and height from 1 to 4096 pixels, so you can make anything from a tiny 1x1 swatch to a large solid-color background image.

Can I use this for a website's background-color placeholder?

Yes, a solid-color PNG at your page's background color is a common low-fidelity placeholder shown while a real hero image loads.

Single-color PNG Generator - Solid Color Swatch Maker

Overview

Introduction

This tool generates a PNG filled with a single flat color at any size you choose, entirely in your browser.

It's the fastest way to turn a hex code into a downloadable image file without opening an image editor.

What Is Single-color PNG Generator?

A solid-fill PNG generator that parses a 6-digit hex color into red, green, and blue byte values, then writes that same color into every pixel of a buffer at the requested width and height.

The output is always fully opaque; every pixel's alpha channel is set to 255.

How Single-color PNG Generator Works

The hex string is validated against a strict 6-digit pattern (with or without a leading #) and split into its red, green, and blue byte components.

Those three values, plus a fixed alpha of 255, are written into every 4-byte pixel slot of the output buffer in a single pass.

When To Use Single-color PNG Generator

Use it to generate a quick color swatch, a solid background image for a mockup, or a placeholder fill in a brand color while real assets are being finalized.

It's also handy for testing how a UI or layout looks against different flat background colors.

Often used alongside Random PNG Generator, Empty PNG Creator and Placeholder PNG Creator.

Features

Advantages

Produces an exact, predictable color with no compression artifacts or color-profile surprises.
Works at any size from a 1x1 swatch up to a large 4096x4096 background fill.
Runs entirely client-side; no image is ever uploaded to a server.

Limitations

Only accepts 6-digit hex colors; named CSS colors (like 'coral') or 3-digit shorthand hex aren't parsed.
Always fully opaque; there's no way to generate a semi-transparent solid fill with this tool.

Examples

Brand-color swatch

Input

width=200, height=200, colorHex=#3366ff

Output

A 200x200 solid blue PNG

Each pixel is set to RGB(51, 102, 255) with alpha 255.

Hex without a leading #

Input

width=1, height=1, colorHex=ff0000

Output

A 1x1 solid red PNG

The leading # is optional; the same 6 hex digits are parsed either way.

Best Practices & Notes

Best Practices

Copy the hex code directly from your design tool to avoid typos in the color.
Use a small size like 8x8 for a quick preview swatch before generating a large background fill.

Developer Notes

generateSingleColorPng is a pure function with no DOM dependency; hex parsing and the per-pixel fill loop are both plain array operations, so the entire lib module is unit-testable under Node, while the component only handles painting the resulting PixelBuffer to a <canvas>.

Single-color PNG Generator Use Cases

Generating a color swatch image for design documentation
Creating a solid-color placeholder background
Producing a flat-fill test image for a UI layout

Common Mistakes

Entering a 3-digit shorthand hex code (like #36f), which this tool doesn't expand — use the full 6-digit form instead.
Forgetting the image is always fully opaque when a transparent fill was actually wanted.

Tips

Use an eyedropper tool in your browser or OS to grab an exact hex code before pasting it in.
Generate at a small size first to confirm the color looks right before rendering a large canvas.

Single-color PNG Generator