A savings counter cannot tell you whether a person will notice a flaw in the photograph. Review the result the way visitors see it: at its normal display size, on light and dark backgrounds, and with attention to the details that made the image worth publishing.
Compare at full size
View the original and result side by side at 100 percent. On photos, inspect faces, texture and gradients. On screenshots and graphics, inspect text, fine lines and transparent edges.
Compare files with the same pixel dimensions. Otherwise a reduction in resolution can look like a compression gain while hiding a loss of detail. Pick representative crops and inspect them at the same zoom level, then view the result inside its actual page component. A product photograph can look acceptable by itself yet reveal blurred texture when it fills a large card.
Match the format to the job
A photograph, interface screenshot and logo behave differently. JPEG or WebP may suit photos; PNG is useful for transparency. Always verify text remains legible and transparent areas remain transparent.
Small labels, colored charts and transparent marks need different checks. For a screenshot, zoom in on letters and one-pixel lines; for a product photo, inspect texture and color; for a logo, place the result on both light and dark backgrounds to expose halos. If a format damages a detail that matters to the page, keep a slightly larger version instead of chasing the highest saving percentage.
What to inspect first
- PhotographsTexture, faces and gradients at the same zoom level.
- ScreenshotsSmall labels, fine lines and contrasting edges.
- LogosTransparency and halos against light and dark backgrounds.
Consider metadata
Embedded EXIF or IPTC data can be removed from a compressed result. Keep authorship and usage information in your content system rather than relying only on file metadata. ANK Image Compress preserves the original bytes privately before replacement.
Camera orientation may rely on EXIF data, so verify that a processed photograph is still correctly rotated on the live page. Store required copyright or credit information in the content record or near the image, where it remains visible even if metadata is stripped. Keep the master file separately when you expect to edit or export the asset again.
Test before a bulk run
For a large media library, start with a small-batch trial before replacing files at scale.
Compress representative files, inspect live pages on several screens and check browser or CDN caches. If the result is unsuitable, use Restore original in the plugin table.
Test restoration before a large batch rather than after receiving a complaint. Record the sample URL and original size, restore it, clear the page cache and inspect the bytes delivered by the browser. If the restored result does not match the expected original, stop and investigate one attachment first. That keeps a local problem from spreading across the media library.
A practical example
Take a screenshot with small labels and a photograph with a smooth sky. Inspect text and fine lines in the screenshot, then color transitions in the photo. Open both results on a phone and a monitor. If the labels become hard to read, the smaller file is not the better result.
Before you publish
- Compare the original and output at 100 percent zoom.
- Inspect transparency, small text and important metadata separately.
- Try restoring an original before starting a large batch.
Explore more
Check the result on your own website and keep an original when you may need to restore it.