Original preview
The original preview appears after you upload a file.
GIF Background Color Replacer
Upload a GIF, choose a source color, replacement color, and tolerance, and replace only background pixels connected to the frame edges.
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.
Edge-connected background and color tolerance
The result area places the original and output side by side and lists dimensions, frames, duration, and file size so you can check the result.
The animated preview is for a quick check. Treat the downloaded file, re-parsed for dimensions, frames, delays, and looping, as the final result.
Learn more
Method and calculation
A four-neighbor search starts at the edge of each frame. It continues while the pixel's RGB distance from the source color is no greater than the tolerance, then replaces the connected pixels.
Boundaries and limitations
Similar colors that connect the background to the subject can still be selected. Complex textures, shadows, and gradients usually need a smaller tolerance.
Privacy and local processing
Reading, decoding, pixel processing, and result generation happen in this browser. Files are not uploaded, third-party runtime APIs are not called, and input is not saved.
Format and standards
GIF parsing and output structure follow the GIF89a format description. Browsers and players can differ in how they display very short delays, finite loops, and color quantization.
GIF background replacement questions
Which pixels does this tool replace?
It starts at each frame edge and follows four-neighbor pixels close to the source color. Matching pixels enclosed inside the subject are left alone.
How should I choose the tolerance?
Start low for flat backgrounds and raise it gradually for compression noise or soft edges. A high tolerance can reach into similarly colored subject areas.