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Base64 Encoder
Base64 Encoder
Upload a file to encode it to Base64 format.
Select File:
Encode to Base64
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Frequently Asked Questions
What types of data can I encode to Base64?
You can encode plain text, HTML, JSON, or any string of characters into Base64 format.
Why would I need to encode something in Base64?
Base64 is used to safely transmit binary data over text-based protocols like email (MIME) or embed images directly in HTML and CSS.
Does Base64 increase file size?
Yes. Base64 encoding increases the data size by approximately 33% compared to the original binary.
Can I encode a file to Base64?
This tool encodes text strings. To encode a file (like an image), use our Image to Base64 converter instead.
What characters are used in Base64 output?
Base64 uses A-Z, a-z, 0-9, + and /. The = character is used for padding at the end. URL-safe Base64 replaces + with - and / with _.
How do I use Base64 in an email?
Email attachments are automatically Base64-encoded by your email client. You do not need to encode them manually for standard email use.
Can I encode JSON to Base64?
Yes. Paste your JSON string into the encoder and it will produce a Base64 representation that can be safely transmitted in URLs or headers.