Understanding KB and MB When Preparing Images for Scanned Documents

Updated June 2, 2026 · 8 min read

Size limits are written in kilobytes and megabytes, and the units trip people up. Scanners often save huge files by default, far more detail than is needed to read a page on screen.

Recommended settings for scanned documents

SettingStarting point
FormatJPEG (WebP where accepted)
Widthabout 1700 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.

Understanding KB and MB When Preparing Images

One megabyte is roughly 1000 kilobytes, and some systems count 1024. If a limit says 100 KB, aim a little under, such as 95 KB, to be safe.

For scanned documents, a target of 200 KB is a comfortable default. Our results panel shows the exact size of each compressed file so you can confirm it before uploading.

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 1700 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

  • Write a size limit slightly below the stated maximum to leave a margin.
  • Process private images locally rather than uploading them to unknown servers.
  • Crop out distractions so pixels go to the subject.
  • Use WebP where it is supported and you control the page.

FAQ

What size should an image be for e-learning courses?

A practical default is about 1600 pixels wide and 200 KB or less, unless the destination states its own limits.

Can I compress images for e-learning courses without uploading them?

Yes. TheCompressJPEG runs entirely in your browser, so your images never leave your device.

Is WebP accepted for e-learning courses?

It depends on the platform. JPEG is the safest choice when you are not sure.

Wrapping up

For scanned documents, the reliable recipe is simple: resize to around 1700 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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