Base64 Decoder
Decode a Base64 string back to plain text instantly. Free, single-purpose online Base64 decoder.
Base64 Input:
Decoded Text:
How to Decode Base64 Online
Paste a Base64-encoded string into the box above and it decodes to plain text instantly — no button to click, no upload, and no account needed. This tool only decodes; if you need to encode text into Base64 instead, use our dedicated Base64 Encoder.
Example
Pasting SGVsbG8gV29ybGQ= decodes instantly to Hello World.
Common Use Cases
- Decoding a Base64 string found in an API response, JWT payload, or config file.
- Reading Base64-encoded email headers or authentication tokens.
- Checking what data is hidden inside a Base64 blob before using it in code.
FAQs
Why does decoding fail with an error?
Base64 strings use a strict character set and are usually padded with = to a multiple of 4 characters. If the pasted text contains line breaks, extra whitespace, or isn't valid Base64 at all, decoding will fail — double-check you copied the full string.
Is this the same as decryption?
No — Base64 is an encoding, not encryption. Anyone can decode it; it provides no security or confidentiality, it's simply a way to represent binary data as plain text.
Does this tool also encode text to Base64?
This page is decode-only, for a simpler, focused experience. Use our separate Base64 Encoder tool if you need to convert plain text into Base64.