In modern web infrastructure, transferring physical files securely and consistently between an application frontend and a backend API can be complicated. Firewalls, JSON payload structures, and cloud storage systems (like AWS Lambda or REST APIs) often struggle to reliably process raw binary files. Converting a PDF document into a Base64 string solves this problem entirely. By transforming the binary PDF document into an ASCII string (beginning with the standard `data:application/pdf;base64,...` header format), the file can be predictably safely serialized into a standard JSON payload and reconstructed on the other side with zero risk of corruption.