Developer Base64 tool

Base64 Decoder

Decode Base64 or Base64URL into UTF-8 text, files, binary bytes and supported images. Everything runs locally in your browser.

Input

Paste Base64 or Base64URL

Auto detect

Paste raw Base64, unpadded Base64URL, or a data:...;base64, URL. Whitespace and line breaks are accepted.

10 MB decoded output limit
Output

Decoded data

Waiting for input
Decoded output will appear here

Text is shown directly. Images are previewed. Other binary data can be inspected as hexadecimal and downloaded as a file.

Decoder reference

Decode text, binary data and files from Base64

A generic Base64 decoder should not assume that every payload is an image. Decoded bytes may represent UTF-8 text, a PDF, an archive, an image or another binary format, so the useful next step is to inspect the decoded bytes before deciding how to display or download them.

Base64URL is a web-safe variant used in tokens and URLs. It replaces + with - and / with _, and padding is often omitted. Normalizing those characters and restoring valid padding allows the browser to decode many Base64URL values without changing the underlying bytes.

Base64URL differences

  • - replaces +
  • _ replaces /
  • Trailing = padding may be omitted
  • Decoded bytes remain binary data

Choose output by content

  • Render valid UTF-8 as text when appropriate.
  • Preview supported image bytes as an image.
  • Download binary payloads when text rendering would corrupt or misrepresent them.
Base64Base64URLUTF-8binaryfile signatures
Related workflows

These links connect the current task with the closest reverse, inspection or format-specific workflow.

Base64 Image Viewer

Use the image-focused decoder when you specifically need to inspect and preview encoded image data.

Base64 Analyzer

Inspect padding, decoded size, MIME hints and known binary signatures before choosing an output.

Base64 to Image

Use the dedicated image workflow when the encoded payload is known to contain an image.