Base64 Decoder

Base64 encoding is a way to convert binary data into ASCII text so it can be easily transmitted over networks or stored in a text file. Base64 is commonly used for encoding images, audio and video files, and other types of data in email attachments and other types of messages.

Yes, Base64 encoding is reversible. The process of encoding the data into a Base64 format can be reversed, or decoded, using a special tool or algorithm, to obtain the original data. The Base64 decoder takes the encoded data and converts it back into the original format, such as an image or a document. This is why Base64 encoding is often used for data that needs to be transmitted or stored in a compact format, yet still needs to be able to be accessed and used in its original form.

Paste your Base64-encoded text into the input box on the left and the decoded plain text appears instantly in the output box on the right. There is nothing to install and no sign-up required — decoding happens entirely in your browser, so your data never leaves your device.

No. Base64 is an encoding scheme, not encryption. It does not use a key and provides no security or confidentiality — anyone can decode a Base64 string back to its original value. Use Base64 only to safely represent binary data as text, and use real encryption (such as AES) when you need to protect sensitive information.

Standard Base64 uses the characters "+" and "/", which have special meaning in URLs. URL-safe Base64 replaces them with "-" and "_" so the encoded value can be used in query strings, filenames, and JWT tokens without further escaping. This decoder handles both standard and URL-safe Base64 input.

This tool decodes Base64 to plain text. If your Base64 represents binary data such as an image, the decoded output will be raw bytes rather than readable text. To view a Base64-encoded image, use a Base64-to-image tool or embed it directly in HTML with a data URI (for example, data:image/png;base64,...).

On macOS or Linux you can decode Base64 in the terminal with "echo 'SGVsbG8=' | base64 --decode". On Windows PowerShell use [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('SGVsbG8=')). This online decoder is a quick alternative when you just need to check a value.