Why did some WebP images not produce a smaller output?

Lossless re-encoding cannot guarantee a smaller file. If Skip larger outputs is enabled, candidates equal to or larger than the source can be skipped.

Is quality 100 the same as true lossless WebP?

No. Quality and lossless mode are separate encoding choices. Enable lossless mode when you need reversible pixel output.

Are WebP images uploaded while compressing on Ubuntu?

No. ImgConvert processes the files and output directory you actively select on your device.

UBUNTU · WEBP → WEBP

How to compress WebP losslessly on Ubuntu

Keep WebP as the output format, enable lossless mode, and re-encode images locally on Ubuntu instead of sending them to an online compressor.

Steps

Import WebP files or a folder.
Keep WebP as the output format.
Enable lossless and keep Skip larger outputs on.
Choose the output directory and process the batch.

Notes

Lossless WebP targets reversible pixels and cannot guarantee a smaller result for every image.

Common questions

Quality 100 is not true lossless mode. The skip option can avoid writing a larger candidate output.

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