Why do I need to enter width and height?

A raw RGB dump stores no dimensions of its own — it's just a flat sequence of pixel bytes — so the tool has no way to know how to arrange them into rows without you supplying the original width and height.

What happens if my byte count doesn't match width x height x 3?

The tool rejects the file with a clear error explaining exactly how many bytes it expected, since a mismatched byte count means the data can't be a valid RGB dump at those dimensions.

Is the resulting PNG transparent?

No. Raw RGB has no alpha channel, so every pixel in the reconstructed PNG is fully opaque (alpha 255).

Does this work for BGR-ordered data instead?

No, byte order matters — if your raw dump stores blue before red, use the BGR to PNG converter instead, or your colors will come out with red and blue swapped.

RGB to PNG Converter - Rebuild a PNG from Raw Pixel Bytes

Overview

Introduction

This tool rebuilds a viewable PNG from a raw RGB pixel byte dump, entirely in your browser.

Since a raw dump carries no dimension metadata, you supply the original width and height and the tool reassembles rows from the flat byte sequence.

What Is RGB to PNG Converter?

A client-side raw-RGB-to-PNG converter that reads a headerless byte file (3 bytes per pixel: red, green, blue), reconstructs an RGBA pixel buffer with full opacity, and paints it to a canvas for download as a PNG.

It's the exact inverse operation of the PNG to RGB converter.

How RGB to PNG Converter Works

The tool validates that the uploaded byte count exactly equals width times height times 3; any mismatch means the data can't represent a valid image at those dimensions and is rejected with a specific expected-byte-count error.

For each 3-byte group it writes red, green, blue, and a fixed alpha of 255 into a new RGBA pixel buffer, which the preview panel then paints to a canvas and offers as a PNG download.

When To Use RGB to PNG Converter

Use it to visualize raw framebuffer dumps captured from an embedded device, custom renderer, or low-level graphics API.

It's also useful for verifying a PNG-to-RGB export round-trips correctly by converting it back and comparing.

Often used alongside PNG to RGB Converter, RGBA to PNG Converter and BGR to PNG Converter.

Features

Advantages

Runs entirely client-side; no upload to a server.
Validates the byte count up front with a specific, actionable error message.
Produces a standard, universally viewable PNG from an otherwise opaque raw format.

Limitations

Requires knowing the exact width and height the raw dump was captured at; there's no way to auto-detect them from the bytes alone.
Always produces a fully opaque image, since raw RGB carries no transparency information to restore.

Examples

Rebuild a captured 16x16 icon

Input

A 768-byte raw RGB file, width 16, height 16

Output

A viewable 16x16 opaque PNG

768 bytes divides evenly into 256 pixels of 3 bytes each, matching the declared dimensions.

Reject a truncated file

Input

A 100-byte file with width 10, height 10 (expects 300 bytes)

Output

An error: "Expected 300 bytes...but got 100."

The byte-count check catches truncated or mismatched dumps before any garbled image is produced.

Best Practices & Notes

Best Practices

Double-check the width and height against however the raw file was originally captured or documented.
If colors look swapped (blue where red should be), try the BGR to PNG converter instead.

Developer Notes

The pure reconstruction logic lives in a lib function that validates the byte count against width x height x 3 before touching any DOM, then writes into a freshly created PixelBuffer using the shared createPixelBuffer/isValidPngDimension helpers.

RGB to PNG Converter Use Cases

Visualizing a raw framebuffer captured from firmware or a custom renderer
Round-trip testing a PNG-to-RGB export pipeline
Recovering an image from a headerless pixel dump when the original dimensions are known

Common Mistakes

Entering the wrong width/height, which produces a garbled, skewed image even though every byte is technically valid.
Assuming the reconstructed PNG preserves transparency — it never does, since raw RGB has no alpha channel.

Tips

If you're not sure of the exact dimensions, try common values first (e.g. powers of two) and check whether the preview looks coherent.
Keep the byte-count error message handy — it tells you exactly how many bytes were expected for your entered dimensions.

RGB to PNG Converter