What is Base64 Encoding (and When to Use It)
June 5, 2026 · By OmniTools Team
What it does
Base64 encodes binary data (like images) into a set of 64 safe ASCII characters, so it can travel through systems built for text — email, JSON, data URIs.
It is not encryption
Base64 is fully reversible and offers zero security. Never use it to hide passwords.
Good use cases
- Embedding small images directly in CSS/HTML with data URIs
- Encoding binary in JSON payloads
- Basic auth headers
The trade-off
Base64 increases size by ~33%. Use it only for small assets. Try our Base64 Encode/Decode tools to experiment.