Why do I need to enter width and height?

A raw BGR dump stores no dimensions of its own — it's just a flat sequence of pixel bytes — so the tool needs the original width and height to arrange them into rows correctly.

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

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

Is the resulting PNG transparent?

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

What if my colors come out swapped?

That means your source data was actually RGB, not BGR — try the RGB to PNG converter instead, since using the wrong converter swaps red and blue in the result.

BGR to PNG Converter - Rebuild a PNG from Raw BGR Bytes

Overview

Introduction

This tool rebuilds a viewable PNG from a raw BGR pixel byte dump, entirely in your browser, swapping the blue-first channel order back to the standard RGB the canvas API expects internally.

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 BGR to PNG Converter?

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

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

How BGR to PNG Converter Works

The tool validates that the uploaded byte count exactly equals width times height times 3; any mismatch is rejected with a specific expected-byte-count error.

For each 3-byte group it writes red (from the third byte), green (second byte), and blue (first byte), plus a fixed alpha of 255, into a new RGBA pixel buffer.

When To Use BGR to PNG Converter

Use it to visualize a raw BGR frame captured from OpenCV, a legacy Windows bitmap pipeline, or camera hardware that outputs BGR by default.

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

Often used alongside PNG to BGR Converter, RGB to PNG Converter and BGRA 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.
Correctly reorders channels back to RGB so the canvas renders true colors instead of a red/blue swap.

Limitations

Requires knowing the exact width and height the raw dump was captured at.
Always produces a fully opaque image, since raw BGR carries no transparency information to restore.

Examples

Visualize an OpenCV frame dump

Input

A 3,072-byte raw BGR file, width 32, height 32

Output

A viewable 32x32 opaque PNG with correct colors

3,072 bytes divides evenly into 1,024 pixels of 3 bytes each, matching the declared dimensions, and channels are reordered back to RGB.

Reject a truncated file

Input

A 50-byte file with width 10, height 10 (expects 300 bytes)

Output

An error: "Expected 300 bytes...but got 50."

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 BGR file was originally captured.
If colors look swapped, confirm your source data is actually BGR and not RGB before troubleshooting further.

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 red/green/blue in the correct RGBA order into a freshly created PixelBuffer.

BGR to PNG Converter Use Cases

Visualizing a raw BGR frame captured from OpenCV or camera firmware
Round-trip testing a PNG-to-BGR export pipeline
Recovering an image from a headerless BGR pixel dump when dimensions are known

Common Mistakes

Entering the wrong width/height, which produces a garbled, skewed image even though every byte is technically valid.
Using this converter on data that's actually RGB, which swaps red and blue in the output.

Tips

If you're not sure whether your data is RGB or BGR, try both converters and see which produces natural-looking colors.
Keep the byte-count error message handy — it tells you exactly how many bytes were expected for your entered dimensions.

BGR to PNG Converter