FAQ
Answers to common questions about safety, formats, backups, delivery, automation, and support.
Does Vacuum modify original images?
JPEG and PNG sources are preserved while WebP and AVIF derivatives are created. WebP source optimization can replace a WebP upload only after creating a backup and only when the optimized candidate is smaller.
Does it use an external API?
No. Optimization happens locally on your WordPress server through Imagick or GD.
Should I enable AVIF?
Enable AVIF only when System Status confirms AVIF read and write support. WebP remains the safer default on more hosts.
Can I restore originals?
Yes, when a backup exists for the attachment. Keep backups enabled before optimization if restore is important.
Why are SVG and GIF files skipped?
SVG is vector content and can carry security concerns. Animated GIF files can lose animation if processed as normal raster images.
Does frontend delivery rewrite my content?
No. Vacuum uses WordPress image output filters and keeps original fallback behavior.
Where do I get support?
Use the WordPress.org support forum or the GitHub repository issues depending on whether the topic is user support or development work.