Base64编码/解码
将文本或文件编码为Base64，并将Base64字符串解码为可读文本
Client-side only — uses native browser btoa / atob APIs. Your data never leaves the browser.
Base64 Encoder & Decoder
Encode any text or binary data to Base64, or decode a Base64 string back to plain text. Used in email attachments, data URIs, JWTs, and API authentication headers.
FAQ
What is Base64 encoding?
Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit over text-only systems like email or URLs.
Is Base64 encryption?
No. Base64 is encoding, not encryption. It is easily reversible and provides zero security. Never use it to protect sensitive data.
Why does Base64 end with == ?
Base64 pads output with = characters to ensure the length is a multiple of 4 bytes. One = means one padding byte, == means two.
What is Base64 used for?
Embedding images in CSS/HTML as data URIs, encoding JWT header/payload, passing binary data in JSON, and HTTP Basic Auth headers.
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