Image File Size Checklist for Email Attachments
Run through this list before you upload. 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.
Image File Size Checklist
Is it the right format? Photos should be JPEG or WebP. Is it the right width? Around 1600 pixels suits email attachments. Is it under the limit? Aim for 500 KB or whatever the destination specifies.
Is it oriented correctly, cropped cleanly and free of private metadata? Our compressor handles orientation and strips metadata automatically when it re-encodes the image.
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
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 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
- How to Get a JPEG Under 500 KB for Email Attachments
Hitting an exact size limit is easier with a target-size compressor.
- Does Compression Affect Image Quality for Email Attachments?
Yes, but how much depends on your settings.
- Fixing Blurry Images After Compressing for Email Attachments
Blurriness after compression usually comes from resizing too far, not from JPEG itself.
- Should You Strip EXIF Data From Images for Email Attachments?
Photos carry hidden metadata such as camera model, date and sometimes GPS location.
- How to Get a JPEG Under 300 KB for Website Hero Images
Hitting an exact size limit is easier with a target-size compressor.
- Fixing Blurry Images After Compressing for Signature Uploads
Blurriness after compression usually comes from resizing too far, not from JPEG itself.