Resize and Compress Images for Email Attachments

Phone cameras routinely produce 3–8MB JPEGs. A handful of those attachments can hit corporate or free-mail limits, slow mobile downloads, or get stripped by gateways. For email, “looks fine on a phone screen” beats “print-ready resolution.”

Recommended starting points

• Max long edge: 1920px for general sharing; 1280px when you need smaller files.
• Target size: 200–400KB per photo for typical threads; lower if you attach many images.
• Format: JPEG for photos (widest email client compatibility). Avoid relying on AVIF in attachments.

Workflow

1. Set Max long edge first—this removes the majority of excess pixels.
2. Set Target size so each attachment stays within your budget.
3. Output JPEG unless the recipient explicitly needs PNG (screenshots with text UI).
4. Attach the compressed files; keep originals locally if you still need them.

Inline images vs attachments

Inline marketing images in HTML email are often smaller still (and hosted on a CDN). For one-off personal or B2B threads, compressed attachments are enough. If a recipient needs full resolution, share a link to cloud storage instead of stuffing the MIME message.

You can run this flow in Upload‑Ready without uploading originals to our servers for processing—compress locally, then attach from your downloads folder.