How to compress email attachments using 7-Zip

Don't clog up email inboxes unnecessarily

7. Use the same method to add updated versions of files. When prompted, click Yes to confirm you want to overwrite. Note that when you add files to an archive, 7-Zip compresses them using the Fastest level, regardless of the level originally used for the archive.

Step_7

Step 7

8. Many email providers enforce attachment size limits. When sending lots of files - or one enormous file - you could come unstuck. 7-Zip lets you split archives into multiple parts. Under Split to volumes, simply enter the maximum size, appending K for kilobytes or M for megabytes.

Step_8

Step 8

9. When you split an archive, 7-Zip will append each part with .00x (where x is the version number). The recipient needs to extract only the first version of an archive. The remaining parts will be automatically stitched together. The recipient will, however, need 7-Zip installed on their system to extract the archive.

Step_9

Step 9

10. Archives can be encrypted. This is useful when emailing sensitive data to someone who uses a shared PC, for example. To encrypt an archive, simply enter and confirm a password. For the encryption method, we recommend 256bit AES. It's an established standard and virtually uncrackable.

Step_10

Step 10

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Jason D'Allison

PC Advisor (UK)
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