Developer Tools
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text for free, online, in your browser.
Processed in your browser
Recommended ToolAI Coding Assistant
GitHub Copilot
AI pair programmer that helps you write code faster with smart suggestions.
What is Base64 Encoder / Decoder?
Base64 encoding converts binary data into a text-safe ASCII string format. It's commonly used to embed images in HTML/CSS, transmit binary data over text-based protocols like email, and encode authentication tokens in APIs.
How to Use
- Paste the text or upload a file you want to encode or decode
- Select encode (text to Base64) or decode (Base64 to text)
- The conversion runs instantly
- Copy the result or download the decoded file
Frequently Asked Questions
- Is Base64 a form of encryption?
- No. Base64 is an encoding scheme, not encryption. Anyone can decode it without a key. Never use Base64 to protect sensitive data.
- Why does Base64 make data about 33% larger?
- Base64 represents every 3 bytes of input as 4 ASCII characters. This 4/3 ratio means the output is always roughly a third larger than the input.
- Where is Base64 commonly used?
- It's used in data URIs for embedding images in HTML, JWT tokens, email attachments (MIME), and transmitting binary data in JSON or XML payloads.