Why this tool is useful
Create a backward motion or inspect an animation's closing states first without uploading the original GIF to a remote editor.

Reverse the visible frame sequence of an animated GIF while retaining each frame's associated duration and processing every pixel locally.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy.
Create a backward motion or inspect an animation's closing states first without uploading the original GIF to a remote editor.
Disposal-aware decoding first produces complete visible frames. The browser reverses those frame records, keeps their paired delays and writes a fresh looping GIF.
Load a three-frame progress animation, confirm that the final green state becomes the first frame, and download the reversed local result.
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.