When this tool is useful
Trying to meet a documented upload limit for an animated GIF while seeing which quality, dimensions or temporal detail had to change.
How local processing works
The browser encodes a bounded series of candidates, measures actual bytes, and chooses the highest-ranked result found within the target according to the documented search order; each candidate uses GIF palette quantization and centisecond delays.
How to use it
- Prepare the source and limits: Keep an unchanged source and review the accepted format, dimensions, frame or page budget, and output choices. Trying to meet a documented upload limit for an animated GIF while seeing which quality, dimensions or temporal detail had to change.
- Process locally: Run the documented bounded operation in this browser and stop when the decoder reports an unsupported structure. The browser encodes a bounded series of candidates, measures actual bytes, and chooses the highest-ranked result found within the target according to the documented search order; each candidate uses GIF palette quantization and centisecond delays.
- Download and verify: Confirm the actual downloaded bytes are within the receiving service's exact limit, review the reported setting changes, play all transitions and loops, and reject a candidate whose text, motion, colors or transparency are no longer acceptable.
Important limitations
A requested size is a target, not a guarantee: the search can fail when headers, frame count or minimum accepted settings already exceed it. Meeting the target can require fewer colors, stronger dithering changes, smaller dimensions or dropped frames; timing is recomputed when frames are sampled, transparency is binary, and the output is lossy.
Verify the downloaded result
Confirm the actual downloaded bytes are within the receiving service's exact limit, review the reported setting changes, play all transitions and loops, and reject a candidate whose text, motion, colors or transparency are no longer acceptable.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When is this workflow useful?
Trying to meet a documented upload limit for an animated GIF while seeing which quality, dimensions or temporal detail had to change.
What does local processing do?
The browser encodes a bounded series of candidates, measures actual bytes, and chooses the highest-ranked result found within the target according to the documented search order; each candidate uses GIF palette quantization and centisecond delays.
Which format limits matter?
A requested size is a target, not a guarantee: the search can fail when headers, frame count or minimum accepted settings already exceed it. Meeting the target can require fewer colors, stronger dithering changes, smaller dimensions or dropped frames; timing is recomputed when frames are sampled, transparency is binary, and the output is lossy.
How should I verify the download?
Confirm the actual downloaded bytes are within the receiving service's exact limit, review the reported setting changes, play all transitions and loops, and reject a candidate whose text, motion, colors or transparency are no longer acceptable.