Base64/URL 解码解析器
支持 Base64 编解码、URL 编解码、Base64 图片预览，以及 JWT 头部/载荷片段解码
Output will appear here.
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Decoded images will be shown here.
How To Use This Decoder Toolkit
Step 1
Choose Parser Mode
Switch between Base64, URL, or JWT segment parsing.
Step 2
Paste Encoded Value
Input encoded text, image data URL, or full JWT token.
Step 3
Decode and Inspect
Read decoded output, preview images, and copy results.
FAQ
Can I decode Base64 images directly in browser?
Yes. Paste a data URL or raw Base64 image string and the tool renders an image preview with detected MIME type and size.
Does URL decoding handle plus signs correctly?
Yes. In decode mode, plus signs are interpreted as spaces before URI decoding, matching common form encoding behavior.
Can I decode only JWT header or payload?
Yes. The JWT mode lets you choose and decode header, payload, or signature-related segments independently.