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

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

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

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

Join the newsletter!


Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jason D'Allison

PC Advisor (UK)
Show Comments

Most Popular Reviews

Latest Articles


PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers


This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang


It really doesn’t get more “gaming laptop” than this.

Jack Jeffries


As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr


The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?