Base64 Encoder
Developer ToolsEncode & decode Base64 strings
FreePrivateInstant
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All history →Base64 Encoder — at a glance
Convert text into Base64 code, or turn a Base64 string back into readable text.
Hello World
Encode
SGVsbG8gV29ybGQ=
How to use it — step by step
Base64 is used in APIs, emails, data URIs and login tokens.
1
Pick Encode or Decode
Encode = text → Base64. Decode = Base64 → text.
2
Paste input
Put your text (or Base64 string) in the input box.
3
Convert
Your result shows instantly.
4
Copy
Copy the output for use in your app.
Pro tips
Small things that make the result better.
✦Base64 is NOT encryption — anyone can decode it.
✦Use the URL-safe variant when the result goes inside a web address.
✦Base64 output is about 33% bigger than the original data.
Quick facts
+33%size increase after encoding
64characters used (A–Z, a–z, 0–9, +, /)
Two-wayencode and decode
URL-safevariant supported
Frequently Asked Questions
Is Base64 secure?+
No. It only changes how data looks. Never use it to hide passwords or secrets.
Why does the output end with “=”?+
The “=” is padding that makes the length a multiple of 4.
Why does decoding fail?+
The input may contain invalid characters or be cut off.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
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