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Base64 Decoder Online
Decode Base64 encoded strings back into clean UTF-8 text and JSON payloads with instant client-side execution.
Base64 Decoder
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Safe Client-Side Base64 Decoding
Basic Auth headers, session secrets, and serialized tokens are commonly encoded in Base64. Decoding them using public cloud APIs exposes those secrets to external server logs. ToolMint decodes your data 100% inside your local browser sandbox.
Frequently Asked Questions
Why do some Base64 strings end with '=' or '=='?
The equals sign '=' is padding. Base64 groups data into 6-bit chunks; if the input bytes are not a multiple of 3, padding characters ensure proper alignment.