Common Mistakes When Compressing Images for WordPress Media Library

Updated April 8, 2026 · 9 min read

A few habits cause most of the blurry or oversized images we see. WordPress generates several thumbnails from every upload, so a heavy original multiplies into many heavy files on your server.

Recommended settings for WordPress media library

SettingStarting point
FormatJPEG (WebP where accepted)
Widthabout 1600 px on the long edge
Quality78
File size200 KB or less

These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.

Common Mistakes When Compressing Images

Compressing the same JPEG again and again stacks artefacts each time, so always work from the original. Setting quality very low on a huge image gives a small file that looks muddy; resizing first is better.

Another mistake is ignoring orientation. Phones store rotation in metadata, and some tools drop it, leaving sideways photos. Our tool applies the correct orientation before compressing, so what you see is what you get for WordPress media library.

Step by step with TheCompressJPEG

  1. Open the compress JPEG to 200 KB tool, or the main compressor for custom settings.
  2. Drop in your image. Nothing is uploaded; it is processed in your browser.
  3. Set the maximum width to 1600 and the target size to 200 KB.
  4. Press Compress, check the result and download it.
Ready to try it? Compress your JPEG to 200 KB now. It's free and private.

Quick tips

  • Use WebP where it is supported and you control the page.
  • Never re-compress an already compressed JPEG if you can avoid it.
  • Strip metadata from images you share publicly.
  • Always keep the original file and compress a copy.

FAQ

How do I compress many images for e-learning courses at once?

Drop all of them into the tool together and use Download all to get a single ZIP.

What JPEG quality should I use for e-learning courses?

Quality around 78 keeps photos looking natural while cutting file size substantially.

Will compressing reduce image quality for e-learning courses?

Some detail is removed, but at sensible settings the difference is not visible at normal viewing size.

Wrapping up

For WordPress media library, the reliable recipe is simple: resize to around 1600 pixels, compress at quality 78 or to a 200 KB target, and check the result before you upload. Keep the original so you can always start again.

Related guides