Zip the folder — it will not shrink a PDF

Whole-file jobs that are not PDF and not photos. ZIP a packet or checksum a download. The 32 MB tab limit is the product, not a slogan.

A folder that must become one zip for a portal, a binary that an API wants as Base64, an installer whose published SHA-256 you want to check — file pages. They are not antivirus and not WeTransfer.

What belongs here

• ZIP tool packs or unpacks in the tab. Zipping one already-compressed PDF rarely beats an email cap.
• File Base64 is bytes → ASCII. Text-only Base64 is a different page. Image data-URIs are image to Base64.
• File SHA-256 is SHA-256 only. Not MD5-as-security, not a virus scan. A 4 GB ISO will not fit; use sha256sum, Get-FileHash, or certutil -hashfile.

Typical ceiling is about 32 MB. Password-protected archives may fail. For PDF size or HEIC, use those hubs — do not Base64 a 30 MB scan and expect email to accept it (encoding adds ~33%).

Zip is not a smaller PDF

A one-file ZIP still looks like one fat attachment to Gmail (25 MB personal). Checksums for large ISOs belong on Get-FileHash / sha256sum when you exceed ~32 MB. SHA-256 only — not antivirus.