Base64 Encoder
Encode or decode Base64 strings instantly
About Base64 Encoder
Base64 is an encoding scheme that converts binary data to ASCII text, making it safe for transfer over text-only channels like email and HTTP headers. This free Base64 Encoder/Decoder instantly converts text to Base64 or decodes any Base64 string back to plain text — perfect for developers working with APIs, JWT tokens, data URIs and email attachments.
How to Use Base64 Encoder
- 1Select "Encode" or "Decode" mode using the toggle at the top.
- 2Paste your plain text (to encode) or Base64 string (to decode) into the input box.
- 3The output appears instantly in real time as you type.
- 4Click "Copy" to copy the result to your clipboard.
Common Use Cases
Base64 encoding increases file size by ~33%. Use it for small images and credentials — not for large files.
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Frequently Asked Questions
What is Base64 encoding?
Base64 is an encoding method that converts binary data into a string of 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is used whenever binary data needs to be stored or transferred in a text-only format, such as in email attachments, data URIs, and HTTP Basic Authentication headers.
Is Base64 the same as encryption?
No. Base64 is encoding, not encryption. It is fully reversible with no secret key — anyone can decode a Base64 string. Never use Base64 to "hide" sensitive data. For security, use proper encryption algorithms like AES-256.
Why does my decoded Base64 look like garbled characters?
If decoding a Base64 string produces garbled output, the original data was binary (like an image or file) rather than plain text. Base64-encoded binary data can only be properly decoded by saving it as the original file type, not as text.
What is a Base64 data URI?
A data URI embeds a file directly in HTML or CSS as Base64 text, eliminating an extra HTTP request. For example: background-image: url("data:image/png;base64,iVBOR..."). This is useful for small icons and images that should always be available without a separate network request.
Why does Base64 end with == or = signs?
Base64 encodes data in 3-byte blocks. If the input length is not divisible by 3, padding characters (=) are added to make the output length a multiple of 4. One = means 1 padding byte; == means 2 padding bytes.