Original preview
The original preview appears after you upload a file.
Boomerang GIF Maker
Upload a GIF, choose the effect or layout you want, and create a new animation locally in your browser with Boomerang GIF Maker.
File and settings
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Processed result
Waiting for a fileOutput preview
The output preview appears after processing finishes.
- Original size
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- Output size
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- Output dimensions
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- Output frames
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- Output duration
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- Processing details
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Choose a file to begin.
How to check the result
Compare the source and output previews, then check dimensions, frame count, duration, and file size to confirm that the chosen settings took effect.
The preview is a quick check. Treat the downloaded file, re-parsed for structure and timing, as the final result.
Learn more
Method and calculation
The tool reads each frame in this browser, applies the selected Boomerang GIF Maker settings, and encodes the result as a GIF.
Boundaries and limitations
Large files or animations with many frames need more memory and may take longer. Check the downloaded GIF in a second player before sharing it.
Privacy and local processing
The GIF is read, decoded, processed, previewed, and encoded in this browser. Nothing is uploaded, no third-party runtime API is called, and the input is not saved.
Format and standards
GIF parsing and output follow the GIF89a format description. Very short delays, loops, and color quantization can look different across browsers and players.
Frequently asked questions
How does the boomerang effect work?
The tool appends a reversed copy of the selected frames after the forward sequence, so the motion plays forward and back.
How can I control endpoints, holds, and loops?
Choose an endpoint mode, set the endpoint hold in milliseconds, and choose the loop count. Smooth mode avoids repeating endpoint frames; repeat modes keep endpoint holds.
Does my GIF leave the browser?
No. The GIF is read, processed, and generated in this browser; the tool does not upload or store the input file.