JPEG vs WebP for Email Attachments

Updated February 8, 2026 · 6 min read

WebP is newer than JPEG and often smaller, but compatibility still matters. Mail providers cap attachment size and big photos slow down both sending and opening, so a lighter file reaches the inbox faster.

Recommended settings for email attachments

SettingStarting point
FormatJPEG (WebP where accepted)
Widthabout 1600 px on the long edge
Quality78
File size500 KB or less

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

JPEG vs WebP

At the same visual quality, WebP files are frequently 25 to 35 percent smaller than JPEG. That makes WebP attractive for websites you control.

For email attachments, check whether WebP is accepted. Many forms, portals and older apps still expect JPEG. When in doubt, JPEG is the safe choice; when you control the page, WebP is a free speed upgrade.

Step by step with TheCompressJPEG

  1. Open the compress JPEG to 500 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 500 KB.
  4. Press Compress, check the result and download it.
Ready to try it? Compress your JPEG to 500 KB now. It's free and private.

Quick tips

  • Always keep the original file and compress a copy.
  • Use JPEG for photos and PNG for logos and line art.
  • Name files descriptively with lowercase words and hyphens.
  • Check the result on a phone, where most people will see it.

FAQ

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.

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.

Wrapping up

For email attachments, the reliable recipe is simple: resize to around 1600 pixels, compress at quality 78 or to a 500 KB target, and check the result before you upload. Keep the original so you can always start again.

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