How is mirroring different from flipping?

Flipping (the horizontal/vertical flipper tools) reverses the entire image. Mirroring instead keeps one half exactly as it was and overwrites the other half with a reflected copy of that first half, producing a perfectly symmetric result — useful when you want symmetry rather than a full reversal.

Which half is kept, and which is overwritten?

For the horizontal axis, the left half is kept and reflected onto the right half. For the vertical axis, the top half is kept and reflected onto the bottom half.

Does this change the image's dimensions?

No. The canvas stays exactly the same size; only the content of the discarded half is replaced with a reflection of the kept half.

What happens to an odd-width or odd-height image?

The exact center column (for horizontal) or row (for vertical) is left untouched, since it doesn't have a distinct mirrored counterpart; only the pixels strictly on the discarded side are overwritten.

PNG Mirrorer - Reflect Half a PNG Onto the Other Half

Overview

Introduction

This tool makes a PNG image mirror-symmetric, entirely client-side, by reflecting one half of it onto the other half.

It's a quick way to create a perfectly symmetric graphic, logo, or pattern from a single asymmetric source image.

What Is PNG Mirrorer?

A client-side PNG symmetry generator that copies the content of one half of the image (left, for the horizontal axis, or top, for the vertical axis) and writes a mirrored copy of it into the other half.

Unlike a full flip, half of the original content is always discarded and replaced, producing symmetry rather than a full reversal.

How PNG Mirrorer Works

For the horizontal axis, the tool iterates every pixel in the left half of the image and writes its color to the mirrored X position on the right side, overwriting whatever was there.

For the vertical axis, it does the same with the top half mirrored onto the bottom, working row by row instead of column by column.

When To Use PNG Mirrorer

Use it to build a symmetric logo or emblem from a single-sided design, create a kaleidoscope-style visual effect, or quickly check what a design would look like if it were perfectly symmetric.

It's also a fun tool for generating abstract symmetric patterns from photographs.

Often used alongside PNG Horizontally Flipper and PNG Vertically Flipper.

Features

Advantages

Runs entirely client-side; the uploaded image is never sent to a server.
Guarantees a perfectly symmetric result along the chosen axis.
Simple to reason about: one half is always the untouched source of truth.

Limitations

Half of the original image content is always discarded and replaced — this is a destructive, one-directional operation.
Only a single axis (horizontal or vertical) can be applied per run; for four-way (both axes at once) symmetry, run the tool twice.

Examples

Build a symmetric emblem from a half-design

Input

A 200x200 PNG with a design only on the left half, horizontal axis

Output

A 200x200 PNG with the left half's design mirrored onto the right half

A quick way to complete a symmetric emblem without manually redrawing the second half.

Create a kaleidoscope-style portrait effect

Input

A 400x400 portrait photo, vertical axis

Output

A 400x400 PNG with the top half mirrored onto the bottom half

Mirroring a photo often produces striking, surreal symmetric compositions.

Best Practices & Notes

Best Practices

Design (or crop) the half you want to keep before mirroring, since that half becomes the sole source for the entire result.
Try both axes to see which produces the more visually interesting symmetric result for your specific image.

Developer Notes

mirrorPng is a pure lib function operating on a plain Uint8ClampedArray PixelBuffer: it clones the source buffer, then overwrites the discarded half's pixels with mirrored copies from the kept half using simple coordinate reflection (width - 1 - x or height - 1 - y) — no DOM access until the component paints the result for preview/download.

PNG Mirrorer Use Cases

Completing a symmetric logo or emblem design from a half-finished asset
Creating kaleidoscope-style symmetric art from a photo
Quickly previewing how a design looks with forced symmetry

Common Mistakes

Not realizing that half of the original image is permanently discarded and replaced — download the original first if you might need it back.
Expecting both axes to be mirrored in one pass; each run only mirrors a single chosen axis.

Tips

Run the tool twice (once per axis) for four-way radial symmetry.
Crop or position your source image so the half you want to keep is centered before mirroring, for the most balanced result.

PNG Mirrorer