How do I decode a Base64 string back to plain text online?

Paste your Base64-encoded string into the input field above. The decoded plain text appears instantly in real time. Works entirely in your browser — no server, no login.

What is Base64 decoding used for?

Base64 decoding is the reverse operation: it converts a Base64 ASCII string back to its original binary or text content. Common uses include: reading HTTP Basic Auth headers, decoding JWT payload segments, inspecting email attachments, and decoding data URIs.

Does the Base64 decoder handle URL-safe Base64 (using - and _ instead of + and /)?

Yes. The decoder automatically handles both standard Base64 (using + and /) and URL-safe Base64 (using - and _). Padding characters (=) at the end are also optional — the decoder works with or without them.

What if the Base64 string is invalid or malformed?

If the input contains characters that are not valid Base64 (outside the A–Z, a–z, 0–9, +, /, =, -, _ set), the decoder shows an error. Make sure to copy the full Base64 string without truncation or extra whitespace.

Is the Base64 decoder free and private?

Yes — free, no account, and nothing is sent to any server.

base64 → text

Base64 Decode

Decode Base64 strings back to plain text instantly. Works entirely in your browser.

Your files are processed locally and never uploaded to our servers.

Input

Output

How it works

1
Type or paste input
Paste your value into the input field. No file needed — works directly in your browser.
2
Get instant results
The result appears in real time as you type. No server, no upload.
3
Copy the output
Click the copy button to copy the result to your clipboard instantly.

Frequently Asked Questions

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Base64 Encode

text → base64

URL Decode

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