File size
How to prepare several photos for one email
By ResizeFox · Published
An email with several photographs needs a budget for the whole set, not just one image. Start with what the recipient needs: a quick visual reference, readable documentation or full-resolution files for editing. Those goals call for different copies of the same source photographs.
Quick reference
| Use | Size or purpose | Note |
|---|---|---|
| Example: 8 photos at 500 KB | 4,000 KB combined | Before message overhead |
| Example: 8 photos at 1,024 KB | 8,192 KB combined | Twice the budget or more |
| Full-resolution originals | Use actual file sizes | Consider a shared folder |
Step by step
- Check your email service and recipient's attachment limits. Gmail currently describes a 25 MB total attachment limit for personal accounts; workplace rules and receiving systems may differ.
- Decide which images are necessary and remove duplicates from the set you plan to send. Keep the originals separately.
- For viewing copies, resize oversized images to the dimensions appropriate for the recipient's task, with proportions locked.
- Compress one photo, inspect the result and use that as a starting point for the others. ResizeFox processes one image at a time; it does not batch-export an email package.
- Add up the actual exported file sizes, attach the files and review the message. If the originals are needed, use a sharing workflow with appropriate access instead of degrading them to fit an attachment budget.
Worked budget: eight photos
If each of eight exported files is at most 500 KB in ResizeFox, their combined budget is 4,000 KB, or approximately 3.91 MiB using 1,024-based units. This is an upper-bound calculation, not a prediction that every photo will finish at exactly 500 KB.
The transmitted message can be larger than the raw files because attachments must be encoded for email. Leave room for that overhead and for any other attachments. Do not plan a set that sits exactly on a stated maximum and assume it will pass every receiving system.
Match quality to the recipient's task
For choosing between room layouts, a moderate-size photo may be enough. For inspecting a serial number or a fabric defect, preserve that detail and include a close-up. For printing or professional editing, ask for the required source format and resolution rather than assuming an email-sized JPG is sufficient.
Open the exported file at a normal viewing scale and read any important labels. If reducing the whole image makes the label unreadable, send a separate detail image when practical. Re-export from the original rather than compressing the already compressed copy again.
When the attachment turns into a link
Gmail's documented behavior for files beyond its attachment limit is to use a Google Drive link. That changes the delivery method: the recipient may need permission to open the shared content. Check access in the sharing service, especially when communicating outside your organization.
A sent email does not prove that a recipient could access every linked file. Keep the original set until delivery is confirmed, and use clear filenames so the recipient can distinguish views without opening every attachment.
See the tradeoffs yourself in the Image Compression Lab: compare text, gradients and transparent graphics with downloadable results.
Sources and further reading
Platform specifications and application rules can change. Refer to the current destination instructions; the worked calculations and preparation choices in this tutorial are not a guarantee of acceptance.