How to compress an image for email

Quick answer

For email, reduce each image to a practical size that still looks readable, then attach the processed files. If you are sending several files, a ZIP can keep them together, but it may not shrink already-compressed photos by much.

Choose a practical size

For a single image, 500 KB or 1 MB is often a useful starting point. For multiple attachments, smaller targets can help keep the message under a mail provider limit.

Keep readability in mind

If the image contains text, reduce dimensions carefully. A tiny file that nobody can read is not useful. Preview the result and choose a higher target if important details look rough.

ZIP is packaging, not magic compression

A ZIP file can make several files easier to send together, but already-compressed images may not shrink much more. Use ZIP when convenience matters, not as a guaranteed way to reduce photo size.

Email-specific mistakes

Do not compress a document screenshot so far that the recipient cannot read the text. Do not assume the email provider limit is the same for every recipient. Some mail systems also reject certain attachment types or very large ZIP files.

When in doubt, send fewer files per message or use a higher-quality image for anything the recipient must inspect closely.

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