Base64 Encoder / Decoder Online

Base64 is an encoding system that converts binary data into an ASCII character string. It uses 64 characters (A-Z, a-z, 0-9, + and /) to represent data. It is commonly used to embed images in HTML/CSS, transmit data in URLs, or encode email attachments.

Encoding an image in Base64 allows you to embed it directly in your HTML or CSS code via a Data URI, without an external file. This reduces the number of HTTP requests, which can improve performance for small images (icons, logos). For large images, a separate file is preferable.

No. Encoding and decoding happen entirely in your browser. Your texts and images never leave your device.

Yes. The encoder correctly handles UTF-8, including accented characters (é, ñ, ü), CJK characters (中文, 日本語), and emojis. The text is first encoded in UTF-8 before Base64 conversion.

No. Base64 is an encoding, not encryption. It does not protect your data — anyone can decode Base64. Never use it to store passwords or sensitive information. Use a proper encryption algorithm for security.

Base64 encoding increases size by about 33%. Three bytes of data become four Base64 characters. This is the cost of converting binary data to ASCII text. This is why Base64 should only be used for small images (< 10 KB).