Free Online Base64 Decoder

Base64 decoding reverses RFC 4648 encoding, producing the original bytes from a Base64 string and optionally interpreting them as UTF-8 text.

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How to Use This Developer Tool

  1. Paste the Base64 string into the input area.
  2. Read the decoded text in the output panel.
  3. Toggle URL-safe handling if the input uses `-` and `_`.
  4. Click Copy to grab the decoded result.

What Is a Base64 Decoder?

Wherever Base64 is used you eventually need to read what's inside — a JWT payload to inspect a claim, a `data:` URI to recover an embedded image, a stored attachment to debug a webhook body. Pasting into a decoder is the fastest path to the underlying content.

The decoder accepts both standard and URL-safe alphabets, auto-normalises padding (the trailing `=` characters are sometimes stripped in URL contexts), and decodes the result as UTF-8 by default. Binary outputs can also be exported as a downloadable file. Use the JWT decoder for tokens specifically — it splits the three parts and pretty-prints the JSON for you.

Frequently Asked Questions

What can Base64 decode output?
Base64 can represent any binary data. Decoding may produce text (UTF-8) or binary. The decoder shows text when valid; binary may need to be downloaded.
What about Base64 URL variant?
Base64URL uses - and _ instead of + and /, and omits padding. Good decoders handle both standard and URL-safe variants.
How do I decode Base64 images?
Paste the Base64 string (with or without data:image/...;base64, prefix). The decoder can display the image or provide a download.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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