Batch Compressing Photos for Email Attachments
When you have dozens of images, consistency matters as much as size. 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.
Batch Compressing Photos
Drop all the files at once. The same settings are applied to each, so a set of photos for email attachments ends up with matching dimensions and similar file sizes.
Use Download all to collect everything in one ZIP. A target of 500 KB per image keeps the whole batch predictable.
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
- Why Your Images Are Too Large for Email Attachments
If an upload keeps failing, the image is usually larger than it needs to be in more ways than one.
- Image File Size Checklist for Email Attachments
Run through this list before you upload.
- 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.
- Why Your Images Are Too Large for Website Hero Images
If an upload keeps failing, the image is usually larger than it needs to be in more ways than one.
- How to Get a JPEG Under 20 KB for Signature Uploads
Hitting an exact size limit is easier with a target-size compressor.