About Base64 Encoder/Decoder
The Base64 Encoder/Decoder is one of the most essential developer tools. It supports encoding and decoding text, URLs, and image files to/from Base64 format. Base64 encoding is widely used in data transmission, inline images, API authentication, and more. The tool runs entirely offline — all encoding/decoding happens in your browser.
How to Use
- Paste the text you want to encode or decode into the input panel
- Click "Encode" to convert to Base64
- Click "Decode" to convert Base64 back to plain text
- Switch to file mode to encode files on disk
- Click the copy button to copy the result to clipboard
Frequently Asked Questions
- Is Base64 encryption?
- No. Base64 is an encoding scheme — it represents binary data as printable ASCII characters. Anyone can decode it easily. Use AES or RSA for actual encryption.
- How much does Base64 increase data size?
- Base64 encoded data is approximately 33% larger than the original. Every 3 bytes of source data become 4 ASCII characters.
- What is URL-safe Base64?
- URL-safe Base64 replaces + and / with - and _, and often omits trailing = padding. It is suitable for URLs, JWTs and filenames.