JPEG vs PNG for Email Attachments

Updated April 27, 2026 · 8 min read

Choosing the wrong format can make a file five times larger than it needs to be. 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 PNG

JPEG is built for photographs with smooth gradients and noise. PNG is built for flat colours, sharp text and transparency. Saving a photo as PNG usually produces a much bigger file with no visible benefit.

For email attachments, use JPEG for photos and PNG only for logos, screenshots with lots of text, or images that need a transparent background. You can convert a PNG photo to JPEG here and often cut its size dramatically.

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

  • 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

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.

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.

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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