Best Image Size for Email Attachments
There is no single magic number, but there is a sensible range for email attachments. 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
| Setting | Starting point |
|---|---|
| Format | JPEG (WebP where accepted) |
| Width | about 1600 px on the long edge |
| Quality | 78 |
| File size | 500 KB or less |
These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.
Best Image Size
As a starting point, aim for roughly 1600 pixels on the long edge and a file size at or below 500 KB. That combination looks clean on modern screens without wasting bandwidth.
If the place you upload to publishes its own limits, those always win. Treat the numbers here as a practical default when no rule is given, and adjust down if uploads fail or pages feel slow.
Step by step with TheCompressJPEG
- Open the compress JPEG to 500 KB tool, or the main compressor for custom settings.
- Drop in your image. Nothing is uploaded; it is processed in your browser.
- Set the maximum width to 1600 and the target size to 500 KB.
- Press Compress, check the result and download it.
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
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.
Related guides
- Best JPEG Quality Setting for Email Attachments
Quality is the slider people touch first, yet it is often the least understood.
- How to Reduce Photo File Size for Email Attachments
Reducing file size is a sequence, not a single click.
- JPEG vs WebP for Email Attachments
WebP is newer than JPEG and often smaller, but compatibility still matters.
- JPEG vs PNG for Email Attachments
Choosing the wrong format can make a file five times larger than it needs to be.
- Best JPEG Quality Setting for Website Hero Images
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- JPEG vs WebP for Signature Uploads
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