Base64 Converter
Quickly encode and decode data to Base64 format with support for full UTF-8 strings.
About Base64 Encoding
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format. It is designed to carry data across channels that only support text content, such as email (MIME) or HTML.
Common Use Cases
- Embedding small images in HTML or CSS (Data URIs). - Encoding authentication headers (Basic Auth). - Safely including complex metadata in URLs.
What Base64 Encoding Is For
Base64 is a way to represent binary data using only 64 printable ASCII characters. It doesn't compress or encrypt anything — it simply repackages bytes into text that can travel safely through systems that were designed for text, such as email, JSON, and HTML. That's why it shows up everywhere from data URIs to API payloads.
Why text-safe encoding exists
Many older protocols and formats can only handle text reliably. If you try to drop raw binary — an image or a file — into an email body or a JSON field, control characters can corrupt it. Base64 sidesteps that by mapping every three bytes into four safe characters, guaranteeing the data survives transport intact.
Everyday uses
Base64 lets you embed a small image directly in CSS or HTML as a data URI (avoiding an extra network request), attach files in email via MIME, and include binary blobs inside JSON APIs. It's also common in configuration files and tokens where only text is allowed.
An important caveat
Base64 is encoding, not encryption. Anyone can decode it instantly, so it provides zero confidentiality. If you need to protect data, encrypt it first and then, if necessary, Base64-encode the ciphertext for safe transport. Never treat Base64 as a way to hide sensitive information.
Quick tips
- Base64 grows data by about 33% — it trades size for transport safety.
- Great for embedding small images as data URIs in CSS or HTML.
- It is reversible by anyone — never use it to 'hide' secrets.
- All conversion here runs locally in your browser for privacy.
Frequently Asked Questions
Common questions about the Base64 Encoder & Decoder.