Why Your Images Are Too Large for WordPress Media Library

Updated March 29, 2026 · 7 min read

If an upload keeps failing, the image is usually larger than it needs to be in more ways than one. 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.

Why Your Images Are Too Large

Modern cameras capture 12 to 50 megapixels. That detail is useful for printing posters but rarely for WordPress media library, where about 1600 pixels wide is plenty.

Metadata, PNG format for photos, and maximum-quality saves also add weight. Re-encoding as JPEG at quality 78 after resizing solves all three at once.

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

  • Check the result on a phone, where most people will see it.
  • Use consistent dimensions for a set of related images.
  • Resize before you compress; it improves quality at any file size.
  • Write a size limit slightly below the stated maximum to leave a margin.

FAQ

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.

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.

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.

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