Professional PCB design tools like Altium 365 offer secure cloud workspaces where teams can upload schematics, PCB layouts, manufacturing files (Gerber, ODB++), and BOMs.
For general or client-level sharing, cloud storage platforms such as Dropbox, Google Drive, and OneDrive are commonly used
Manufacturing platforms like PCBWay or JLCPCB allow users to upload project files when requesting fabrication services.
For simple or one-time exchanges, PCB design files (Gerber, schematic PDFs, drill files, BOMs) can be shared via email or messaging tools like WhatsApp or Slack
Most modern sharing platforms allow setting permissions such as read-only access, password protection, or restricted downloads.