Free Online Base64 Encoder & Decoder
Convert text or data to and from Base64 encoding instantly. Automatically detects whether to encode or decode based on your input.
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Frequently Asked Questions
What is Base64 encoding?
Base64 encodes binary or text data into a string using only 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is used in email attachments, data URIs, and API tokens where binary data needs to be safely embedded in text-based formats.
Does Base64 encrypt my data?
No. Base64 is encoding, not encryption. The original data can be recovered by anyone with a decoder. Do not use Base64 to hide sensitive information.
What is the size overhead of Base64?
Base64 output is approximately 33% larger than the input. Every 3 bytes of input become 4 characters of output.