Base64 Use Cases for Developers

Discover where Base64 encoding shines, from email attachments to data URLs and test fixtures.

Email clients and multipart payloads still rely on Base64 to safely transport binary attachments. Encoding ensures that signatures, PDFs, and images survive SMTP gateways without corruption.

Modern APIs also use Base64 when binary data must travel inside JSON. Instead of writing temporary files, you can bundle binary blobs inline and decode them on the server. The Base64decode tool helps you validate these blobs before shipping.

Even during testing, Base64 shortens feedback loops. Store fixtures or mock responses as encoded strings and decode them on demand to keep repositories clean while maintaining reproducible results.