Overview
Introduction
This tool flips a PNG image top-to-bottom, entirely client-side, reversing the pixel order within every column.
It's the vertical counterpart to the horizontal flipper tool.
What Is PNG Vertically Flipper?
A client-side PNG flipper that reads an uploaded image's pixel data and writes each pixel to its mirrored Y position, producing a top-bottom reversed copy the same size as the source.
Like horizontal flipping, this is a lossless, pixel-perfect transform with no interpolation.
How PNG Vertically Flipper Works
For every pixel at position (x, y), the tool copies its color directly to position (x, height - 1 - y) in the output, effectively reversing the vertical order of rows while keeping each row's horizontal content unchanged.
Because every output pixel maps to exactly one input pixel, there's no sampling or blending involved.
When To Use PNG Vertically Flipper
Use it to create a reflection-style effect below an image, fix an upside-down scan or photo, or build an inverted variant of an icon or graphic.
It's also a common building block when combined with other transforms to reach any of the 8 standard orientation variants.
Often used alongside PNG Horizontally Flipper and PNG Mirrorer.
Features
Advantages
- Runs entirely client-side; the uploaded image is never sent to a server.
- Pixel-perfect result with zero interpolation or quality loss.
- Extremely fast, since every pixel maps 1:1 with no sampling math.
Limitations
- Any text or inherently asymmetric detail in the image will appear upside-down after flipping.
- Flipping twice returns the exact original image, so it's not useful for creating multiple distinct variants on its own.
Examples
Best Practices & Notes
Best Practices
- Check for any text in the image before flipping — it will read upside-down unless that's the intended effect.
- Combine with the horizontal flipper for a full 180-degree point reflection (equivalent to a 180° rotation).
Developer Notes
flipPngVertically is a pure lib function operating on a plain Uint8ClampedArray PixelBuffer: it allocates a new buffer of the same dimensions and copies each pixel to its vertically mirrored position in a single pass — no DOM access until the component paints the result for preview/download.
PNG Vertically Flipper Use Cases
- Creating a reflection-style graphic below an image
- Correcting an upside-down scanned or photographed document
- Building an inverted variant of an icon or sprite
Common Mistakes
- Flipping an image that contains readable text, not realizing it will come out upside-down.
- Confusing this with a 180-degree rotation — a vertical flip alone doesn't also reverse left-to-right order.
Tips
- Combine horizontal and vertical flips for a full point-symmetric flip, equivalent to a 180-degree rotation.
- For a classic reflection effect, flip the image vertically and place the flipped copy directly below the original with reduced opacity.