Base64 Encoder

Developer Tools

Encode & decode Base64 strings

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Add a file · .txt .md .csv .json … · up to 2.00 MB
Full guide, 3 min readBase64 is not encryption, and it makes files a third biggerRead the story behind this tool →
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Base64 Encoder — at a glance

Convert text into Base64 code, or turn a Base64 string back into readable text.

Plain text
Hello World
Encode
Base64
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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