Email, Messaging, & Video Calls Email Why You Should Compress Files Before Emailing Them Don't waste your recipients' time by attaching huge files by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on October 14, 2019 Alex Belomlinsky / Getty Images Email Yahoo! Mail Gmail Tweet Share Email No one likes to wait for a long download; large email attachments cost the recipient time, space, and money. Be considerate and compress any attachments you send with your email. A lot of the download time generated by the attached files is unnecessary. Some file formats are not space-conscious. Documents created by word processors such as Microsoft Word are notorious for wasting space on your computer or handheld device. It takes just seconds to compress, stuff, or zip them. Compress Files Before Sending them as Email Attachments You can prevent large files from wasting network resources by compressing them with one of the utilities on the market for this specific action such as: WinZip (Windows, Mac)7-Zip (Unix, Mac, Windows)StuffIt (Mac, Windows) bzip2 (Unix, Mac, Windows) Many word processing documents can be compressed to 10 percent of their original size. The recipient may need the expander unless his computer or device already supports the compression expander. Compress Files With Operating System Software The current Windows and Mac operating systems include compression software for compressing large files. In macOS, control-click any file and choose Compress from the menu options to reduce file size. In Windows 10: Open File Explorer.Right-click the file you want to zip.Click Send to > Compressed (zipped) folder. The recipient expands the compressed file by double-clicking it. Don't Send Huge Files via Email If the file you want to attach to an email surpasses 10MB or so even after compression, it's better to use a file sending service or cloud-storage service rather than attach it to an email. Most email accounts place limits on the size of files they accept.