About Base64
Base64 maps binary data into 64 ASCII characters (A–Z, a–z, 0–9, +, /)
using 6 bits per character. It's used to safely transmit binary data
through text-only systems like email (MIME), JSON APIs, and data URIs.
Not encryption
Base64 is encoding, not encryption. Anyone can decode it.
~33% overhead
Base64 uses 4 characters per 3 bytes, increasing size by about 33%.
URL-safe variant
URL-safe Base64 replaces + with − and / with _.
Common uses
Email attachments, JWT tokens, data URIs, API payloads.
How to Use This Converter
- Enter the value you want to convert.
- Choose the From unit.
- Choose the To unit.
- Click Convert to see the result instantly.
Frequently Asked Questions
What is Base64 used for?+
Base64 encodes binary data into ASCII text so it can be safely transmitted through text-only systems like email (MIME) and JSON APIs.
Does Base64 encrypt data?+
No. Base64 is encoding, not encryption. Anyone can decode it. Never use it as a substitute for encryption.
Why does Base64 make data larger?+
Base64 uses 4 characters to represent 3 bytes, increasing size by about 33%.
What is URL-safe Base64?+
URL-safe Base64 replaces '+' with '-' and '/' with '_' to avoid conflicts with URL syntax.
Is Base64 reversible?+
Yes. Base64 encoding is fully reversible — decoding returns the original data.
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