Overview
Introduction
Flipping (mirroring) an animated GIF horizontally or vertically is a common quick fix, whether to correct an inverted capture or to create a mirrored variant of an existing animation.
This tool decodes every frame, mirrors it along the chosen axis or axes, and re-encodes a new animated GIF, entirely client-side.
What Is GIF Flipper?
A client-side tool that mirrors every frame of an animated GIF horizontally (left-right), vertically (top-bottom), or both at once, based on two independent toggles.
Flipping both axes together produces the same visual result as a 180-degree rotation, since mirroring on both axes is mathematically equivalent to a half-turn.
How GIF Flipper Works
For each frame, the tool copies every source pixel to its mirrored position: a horizontal flip maps column x to column (width - 1 - x); a vertical flip maps row y to row (height - 1 - y); both flips combine both remappings.
This runs identically on every decoded frame, and the flipped frames are re-encoded into a new GIF with unchanged per-frame delays and loop count.
When To Use GIF Flipper
Use it to correct a GIF that was captured mirrored (a common artifact from some webcam or screen-recording setups) or to create a mirrored variant for a symmetric design.
It's also a quick way to reverse a left-to-right animated motion into a right-to-left one, purely visually (see gif-reverser if you instead want the animation's frame order reversed).
Often used alongside GIF Rotator, GIF Reverser and GIF Shifter.
Features
Advantages
- Handles both flip axes in one tool, toggled independently.
- Applies the same mirror consistently to every frame, keeping the whole animation coherent.
- Runs entirely client-side; nothing you upload leaves your browser.
Limitations
- Mirrors any text or asymmetric detail in the frame, which will read backward after a horizontal flip.
- Doesn't change frame order or timing; for a backward-playing animation, use gif-reverser instead.
Examples
Best Practices & Notes
Best Practices
- Check whether any text or logo appears in the frame before flipping; mirrored text usually looks wrong and needs a different fix.
- Use both flips together only when you specifically want the 180-degree-rotation-equivalent look; otherwise pick just one axis.
- Pair with gif-reverser if you want both a mirrored appearance and a reversed playback order.
Developer Notes
flipGif in gif-flipper.ts combines what the PNG category splits into two separate tools (png-horizontally-flipper.ts and png-vertically-flipper.ts) into one function with two boolean flags, since this batch's spec calls for a single bespoke UI covering both axes. The per-pixel remapping math is identical to those two PNG tools' logic, run per decoded GIF frame via transformGifFrames.
GIF Flipper Use Cases
- Correcting a mirrored webcam or screen-recording capture
- Creating a mirrored variant of a symmetric animated logo or icon
- Producing a 180-degree-rotated look by flipping both axes at once
Common Mistakes
- Flipping a frame that contains readable text, which becomes backward and unreadable after a horizontal mirror.
- Confusing this tool (which mirrors pixel content) with gif-reverser (which reverses playback order); they solve different problems.
Tips
- If nothing looks different after flipping, double check that at least one of the horizontal/vertical toggles is actually enabled.
- For text-heavy GIFs, consider whether the source needs to be re-exported rather than fixed after the fact with a flip.