Is convert_jpeg_to_progressive enabled by default?

Yes. convert_jpeg_to_progressive is in CoreFilters, the default RewriteLevel, so it runs unless you turn it off with DisableFilters. It is also part of the OptimizeForBandwidth level.

How do I turn off convert_jpeg_to_progressive?

Add ModPagespeedDisableFilters convert_jpeg_to_progressive on Apache or pagespeed DisableFilters convert_jpeg_to_progressive; on nginx. On IIS, add pagespeed DisableFilters convert_jpeg_to_progressive to pagespeed.config.

filter · Image filters

Progressive JPEG (convert_jpeg_to_progressive)

Q: What does the convert_jpeg_to_progressive filter do?

convert_jpeg_to_progressive converts large baseline JPEGs to progressive encoding. Progressive JPEGs render incrementally and are often smaller for images above ~10 KB.

Category:: Image
CoreFilters:: Yes
OptimizeForBandwidth:: Yes
Risk:: Generally safe

convert_jpeg_to_progressive converts large baseline JPEGs to progressive encoding. Progressive JPEGs render incrementally and are often smaller for images above ~10 KB.

When to use it

In CoreFilters, the default RewriteLevel: it runs unless you disable it.
Part of OptimizeForBandwidth, the level that optimizes resources without changing their URLs.
Also switched on by recompress_images and rewrite_images.
Risk rating on these docs: Generally safe.

Risks

The Image filters page lists no specific risks for this filter. If a page misbehaves with it, DisableFilters convert_jpeg_to_progressive turns it off for the scope you set it in.

Configuration

Enable it in the module configuration, at server, virtual-host or location scope:

Apache

ModPagespeedEnableFilters convert_jpeg_to_progressive

nginx

pagespeed EnableFilters convert_jpeg_to_progressive;

IIS (pagespeed.config)

pagespeed EnableFilters convert_jpeg_to_progressive

It is on by default under CoreFilters; to turn it off:

ModPagespeedDisableFilters convert_jpeg_to_progressive   # Apache
pagespeed DisableFilters convert_jpeg_to_progressive;   # nginx
pagespeed DisableFilters convert_jpeg_to_progressive   # IIS

Parameter	Default	Description
`ProgressiveJpegMinBytes`	10240	Minimum JPEG size before converting to progressive
`WebpRecompressionQuality`	80	Quality for lossy WebP conversion
`WebpAnimatedRecompressionQuality`	70	Quality for animated WebP conversion

Scoping, ForbidFilters and the thresholds filters read: Choosing filters .

Frequently asked questions

What does the convert_jpeg_to_progressive filter do?: convert_jpeg_to_progressive converts large baseline JPEGs to progressive encoding. Progressive JPEGs render incrementally and are often smaller for images above ~10 KB.
Is convert_jpeg_to_progressive enabled by default?: Yes. convert_jpeg_to_progressive is in CoreFilters, the default RewriteLevel, so it runs unless you turn it off with DisableFilters. It is also part of the OptimizeForBandwidth level.
How do I turn off convert_jpeg_to_progressive?: Add ModPagespeedDisableFilters convert_jpeg_to_progressive on Apache or pagespeed DisableFilters convert_jpeg_to_progressive; on nginx. On IIS, add pagespeed DisableFilters convert_jpeg_to_progressive to pagespeed.config.

convert_gif_to_png — Convert GIF to PNG
convert_jpeg_to_webp — Convert JPEG to WebP
convert_png_to_jpeg — Convert PNG to JPEG
convert_to_webp_animated — Animated WebP
convert_to_webp_lossless — Lossless WebP
convert_jpeg_to_avif — Convert JPEG to AVIF
convert_to_avif_animated — Animated AVIF
convert_to_avif_lossless — Lossless AVIF

This page is drawn from the convert_jpeg_to_progressive entry on Image filters. Every filter in one table: PageSpeed filters.

When to use it

Risks

Configuration

Frequently asked questions

Related filters