Base64 Encoder/Decoder
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About the Base64 Encoder/Decoder
The Base64 Encoder/Decoder converts text and data to and from Base64, the encoding used to safely carry binary or special characters through text-based systems. Encode a value for transport, or decode a Base64 string back to readable form.
Base64 shows up everywhere in development: embedding images in CSS or HTML, encoding credentials in headers, and moving data through systems that only accept text. Being able to encode and decode quickly is a daily convenience for developers.
Everything runs in your browser, so your data never leaves your device. That’s important when decoding tokens or credentials — nothing is uploaded, and no account is needed.
How to use the Base64 Encoder/Decoder
- Paste the text or Base64 string into the input area.
- Choose whether to encode to Base64 or decode from it.
- Run the conversion.
- Review the result in the output area.
- Copy the encoded or decoded value.
Common use cases
- Encoding an image as Base64 to embed directly in HTML or CSS.
- Decoding a Base64 string to see its original contents.
- Encoding values for inclusion in headers or tokens.
- Moving data through a system that only handles plain text.
Frequently asked questions
Is Base64 a form of encryption?
No. Base64 is encoding, not encryption — it’s easily reversible and provides no security. Use it for safe transport of data, not to protect secrets.
Can I encode files or images?
Base64 is commonly used to represent binary data like images as text; this tool focuses on encoding and decoding string data quickly.
Why does Base64 make data larger?
Base64 represents every 3 bytes as 4 characters, so encoded data is roughly a third larger than the original — the trade-off for text-safe transport.
Is my data uploaded to a server?
No. Encoding and decoding happen in your browser, so your data never leaves your device.
How do I encode a URL instead?
Use the URL Encoder/Decoder for percent-encoding that’s specific to URLs.