Which half of the icon is kept?

For horizontal symmetry, the left half is kept and mirrored onto the right half; for vertical symmetry, the top half is kept and mirrored onto the bottom half. The kept half's content is always preserved exactly.

What happens to an odd center row or column?

It's left untouched either way — only the halves on either side of the center get overwritten, so a single center pixel row/column (for odd-numbered dimensions) keeps its original content.

How is this different from a plain mirror or flip tool?

A plain flip reverses the entire image left-to-right or top-to-bottom. This tool instead discards one half's original content and replaces it with a mirrored copy of the other half, so the final result is symmetric rather than simply reversed.

Can I create both horizontal and vertical symmetry at once?

Run the tool once for each axis: apply horizontal symmetry first, download the result, then re-upload it and apply vertical symmetry to get an icon symmetric on both axes.

Symmetric Icon Creator - Force an Icon into Perfect Symmetry

Overview

Introduction

This tool forces an uploaded icon into perfect symmetry by mirroring one half onto the other, entirely in your browser.

It's useful for cleaning up hand-drawn or scanned icons that should logically be symmetric but drifted slightly off during creation.

What Is Symmetric Icon Creator?

A client-side symmetry tool: it reads an icon's pixel data and, for the chosen axis, copies every pixel from one half of the image to its mirrored position in the other half.

The result is a new icon that's guaranteed to be pixel-perfect symmetric along that axis.

How Symmetric Icon Creator Works

For horizontal symmetry, the tool walks every pixel in the left half of the image and writes its color to the mirrored x-position (width - 1 - x) on the same row.

For vertical symmetry, it walks every pixel in the top half and writes its color to the mirrored y-position (height - 1 - y) on the same column; any odd center row or column is left as-is.

When To Use Symmetric Icon Creator

Use it to clean up a hand-drawn or scanned icon that's meant to be symmetric (like a shield, badge, or logomark) but has small inconsistencies between its two halves.

It's also useful for quickly generating a symmetric placeholder icon from any source image.

Often used alongside Icon Mirrorer and Icon to Grayscale Converter.

Features

Advantages

Runs entirely client-side; your icon is never uploaded to a server.
Guarantees pixel-perfect symmetry rather than an approximate visual match.
Works on either axis, so both left-right and top-bottom symmetric designs are supported.

Limitations

This discards the original content of one half entirely — if that half held unique detail you wanted to keep, it will be lost.
Icons with off-center focal points can look distorted once forced into symmetry, since the tool has no concept of the icon's actual subject.

Examples

Horizontal symmetry on a badge icon

Input

A slightly lopsided 64x64 badge PNG, horizontal axis

Output

A new 64x64 PNG where the right half exactly mirrors the left half

The left half's pixels are copied to their mirrored x-position on the right, producing a perfectly balanced badge shape.

Vertical symmetry on a shield icon

Input

A shield PNG with a slightly uneven top/bottom, vertical axis

Output

A new PNG where the bottom half exactly mirrors the top half

The top half's pixels are copied to their mirrored y-position on the bottom.

Best Practices & Notes

Best Practices

Pick the half you like better as the source before running the tool, since only the opposite half gets overwritten.
Preview the result before downloading — forced symmetry can look odd if the source icon wasn't roughly symmetric to begin with.

Developer Notes

createSymmetricIcon is a thin wrap around the existing createSymmetricPng function from symmetric-png-creator.ts — the same half-mirroring pixel math, just re-exported under an icon-focused name, since an icon is simply a PNG once decoded into a PixelBuffer.

Symmetric Icon Creator Use Cases

Cleaning up a hand-drawn badge or shield icon into perfect symmetry
Generating a symmetric placeholder icon from an asymmetric source image
Fixing minor left-right or top-bottom inconsistencies in a logo icon

Common Mistakes

Assuming the tool blends both halves together — it fully discards one half rather than averaging the two.
Applying it to an icon with an intentionally asymmetric design, which will look wrong once forced symmetric.

Tips

If the wrong half was kept, flip the source image first (with the Icon Mirrorer tool) before re-running this tool.
Combine with the Icon Colors Changer for a fully cleaned-up, on-brand symmetric icon.

Symmetric Icon Creator