Base64 Encode / Decode Online
Encode or decode Base64 strings directly in your browser.
What Is Base64 Encoding?
Base64 Encode / Decode is a free online tool that encode or decode Base64 strings directly in your browser. No files are uploaded — everything is processed locally on your device.
This Base64 encode decode online tool converts data between its original form and a string of ASCII characters using a 64-character alphabet. Encoding is commonly used to embed images in HTML or CSS, transmit binary data through text-based protocols like email or JSON APIs, and encode authentication credentials, while decoding reverses the process to recover the original data. Our tool handles both directions in your browser with no data sent to any server.
Privacy guarantee: Base64 Encode / Decode processes all files directly in your browser using WebAssembly. No data is uploaded to any server, no information is collected, and the tool works offline after loading. Unlimited usage with no signup, no watermarks, and no file size limits.
How to Use Base64 Encode / Decode
Choose mode
Select whether you want to encode text to Base64 or decode a Base64 string.
Enter your input
Paste the text to encode or the Base64 string to decode into the input area.
Copy the result
See the encoded or decoded result instantly and copy it to your clipboard.
Why Use Our Base64 Encoder/Decoder?
Frequently Asked Questions
Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string. It is designed for data transport, not security. Do not use it to protect sensitive information.
Why does Base64 make the data larger?
Base64 represents every 3 bytes of input as 4 ASCII characters, resulting in approximately 33% size overhead. This trade-off enables binary data to travel safely through text-only channels.
Can I encode files like images to Base64?
Yes. You can upload a file and the tool will produce the Base64-encoded string, which you can then embed in HTML, CSS, or include in API payloads.
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