Base64 Encoder / Decoder
Encode and decode Base64 strings with full Unicode support. Nothing ever leaves your browser.
This tool runs entirely in your browser. No data is ever sent to any server.
Base64 Encoding FAQ
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into a set of 64 printable ASCII characters. It is commonly used to embed binary data in text-based formats like JSON, XML, HTML, and email.
Why encode to Base64?
Base64 encoding is used when binary data needs to be transmitted over text-based protocols. Common uses include embedding images in CSS/HTML (data URIs), sending binary attachments in email (MIME), and encoding credentials in HTTP Basic Authentication.
Does Base64 increase data size?
Yes. Base64 encoding increases the data size by approximately 33% because every 3 bytes of input become 4 bytes of output. This trade-off is acceptable when text-safe transmission is more important than size efficiency.
Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme, not encryption. It provides no security — anyone can decode Base64 data. For sensitive data, use proper encryption (like AES-256) before encoding.
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