Transcoding

Located in the output tab.

Transcoding Options

JPEG XL

Quality

Higher values result in higher quality and higher file size.

  • 90 - visually lossless

  • 80 - high quality and reasonable file size

  • 70 - medium-high quality and small file size

  • 60 - space-saving, noticeable blurriness

Effort

higher is better quality or lower file size but slower. Its behavior depends on the mode used.

  • 7 - normal speed with modest file size and good quality.

  • 9 - very slow but produces lowest file size or best quality.

Behavior

  • Lossy - higher values result in higher quality. File size may end up larger, especially for non-photographic images.

  • Lossless and Lossy Modular - higher values always result in lower file size.

Lossy Modular

  • Disabled - uses VarDCT mode, preferred for photographic images.

  • Enabled - offers lower file size and increased eligibility for non-photos. It has a drawback of introducing discoloration and artifacts on the edges. Use it sparingly.

AVIF

Quality

Higher is better quality and bigger size.

  • 90 - visually lossless

  • 80 - high quality and file size

  • 70 - good balance between quality and file size

  • 60 - space-saving

Speed

lower is slower, better quality, and smaller file size

  • 6 - regular speed, and good quality

  • 0 - very slow, the best quality, and smallest file size

WebP

Quality

Higher is better quality and bigger size.

  • 90 - high quality and large file size

  • 80 - reasonable quality and file size

  • 60 - looks fine only from far away

Method

Higher means better quality and/or smaller file size.

Typical values: 4 - 6

Behavior

  • Lossless: higher values result in lower file size.

  • Lossy: higher value result in lower file size and typically higher quality (can be subjective).

JPEG

Quality

Higher is better quality and bigger size.

  • 95 - high quality and very large file size

  • 90 - reasonably high quality and large file size

  • 80 - reasonable quality and file size

  • 60 - looks fine only from far away

Chroma Subsampling

Controls color compression. Lower number means less color information and smaller file size.

  • Default - usually picks 4:4:4, but tries to match the input

  • 4:4:4 - full color, the highest quality and file size

  • 4:2:2 - less color (small visual difference), and significant space-saving

  • 4:2:0 - colors may appear washed out

  • 4:0:0 - grayscale

Learn more

Smallest Lossless

Converts to multiple formats and outputs the smallest one.

Caution

Be mindful of the maximum supported bit depth. See this page.

PNG Optimization

Reduces file size with lossless recompression.

Level

Higher levels offer better compression, but take longer.

  • 2 - fast, fair compression ratio.

  • 4 - slower, great compression ratio.

  • 5-6 - much slower, provide diminishing returns.

  • 7-9 - extremely slow, little to no difference in compression, use Zopfli.

Note

Levels higher than 4 offer marginal returns.

In-place

Replaces the original file with an optimized version.

Remaining Modes