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Base64 Decoder

Decode Base64 strings back to readable text. Supports UTF-8 and detects invalid Base64 input with helpful errors.

About Base64 Decoder

The Base64 Decoder reverses Base64-encoded text back to its original string form. It handles standard Base64, URL-safe Base64, and padded or unpadded strings. All decoding is performed client-side for privacy.

How to Use Base64 Decoder

  1. Paste your Base64-encoded string into the input.
  2. Click 'Decode Base64' to reveal the original text.
  3. Copy the decoded output to your clipboard.

Frequently Asked Questions

Why is my Base64 not decoding?

Ensure the string uses valid Base64 characters (A-Z, a-z, 0-9, +, /, =). Remove any whitespace or line breaks if present.

Can I decode binary data?

This tool decodes to text. For binary data such as images, use a dedicated binary decoder or save the decoded bytes directly.

Does this support URL-safe Base64?

Yes. The decoder automatically handles both standard Base64 (+, /) and URL-safe Base64 (-, _) variants.