Sharing

Email attachment preparation

Make files small enough to send and easy to open, and bundle several into one attachment.

Before you start

Email providers cap attachment size and block some file types, and a bounced or unopenable attachment usually costs a second email. Check two things before you send: that the files fit the limit together, and that the recipient can open the format. iPhone HEIC photos, for example, will not open on many Windows computers.

Read the guide: Best formats for email attachments

Start here

Popular tools for this

Open a tool and process your file directly. Files are processed in your browser.

ZIP for email Compress image Compress PDF Split PDF Reduce ZIP size

Available actions

Compress images and PDFs
Convert iPhone HEIC photos to JPG
Split a long PDF into smaller files
Bundle several files into one ZIP
Split a ZIP that is too large to send

Supported formats

PDFJPGPNGWEBPZIP

These are the formats the tools on this page accept today. If yours is not listed, the supported formats page lists everything FormatOS reads.

Common uses

Get a scanned document under the attachment limit
Send iPhone photos to someone on Windows
Send ten files as one attachment

Limitations

Attachment limits differ between email providers.
For very large files, a link from a cloud storage service is more reliable than an attachment.
Open the compressed file and check it before sending anything important.