轉換工具
Base64 Encode / Decode
Convert plain text to Base64 and back.
為什麼用這個工具
03Encode or decode Base64 values directly in the browser for quick debugging and formatting work.
Base64 Tool makes it easy to inspect or transform encoded strings without leaving the page.
It is useful when working with APIs, tokens, and embedded assets.
怎麼使用
02複製前快速檢查
03先确认输入格式符合你的预期。
在把结果用于文档、链接、配置或消息前快速扫一眼。
只复制你真正需要的输出。
常見問題
03
Can I decode invalid Base64?
If the input contains characters outside the Base64 alphabet (A–Z, a–z, 0–9, +, /, =) or has incorrect padding, the decoder returns an empty result without crashing. This is intentional — a single corrupt character can shift the entire byte boundary. If you get an empty output, check whether the input contains line breaks, spaces, or URL-safe characters like - and _ (which belong to Base64url, a variant used in JWTs and URL tokens).
Does the text leave the browser?
No. Encoding and decoding happen entirely in the browser tab.
Can I decode Base64 images or binary data?
The tool is designed for text content. Binary or image Base64 may not decode cleanly to readable text.
相關工具
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Encode and decode URL-safe text values.
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Format, minify, and validate JSON in one place.