Free Base64 Decoder

Decode Base64 (standard or URL-safe) back to readable text.

Loading tool…
  • 🔒 Files never leave your device
  • ⚡ Converted in your browser
  • ✅ No account required

Base64 Decoder: The Complete Guide

Paste Base64 and decode it back to readable UTF-8 text instantly. Both standard and URL-safe Base64 are supported, and missing padding is handled automatically.

How to use the Base64 Decoder

  1. Paste or type your code, text, or data into the input box.
  2. Adjust options such as indent size, dialect, or flags when the tool offers them.
  3. The output updates instantly — copy it to your clipboard or download the file.

Features

  • Standard & URL-safe input
  • Correct UTF-8 decoding
  • Auto-fixes missing padding
  • Copy or download the result

Why use this tool

  • Inspect encoded payloads and tokens
  • Read data URIs and config values
  • Private — nothing leaves your device

What does a Base64 decoder do?

A Base64 decoder reverses Base64 encoding, converting the encoded string back into the original text or data. It's handy for inspecting tokens, data URIs, email attachments, and any value that was Base64-encoded for safe transport.

Frequently Asked Questions

Why do I get garbled output?

The input may not be valid Base64, or it may decode to binary (like an image) rather than text. Check that you pasted the complete string.

Does it handle URL-safe Base64?

Yes — it accepts the URL-safe alphabet (- and _) and fixes missing padding automatically.

Is it free and private?

Yes — it's 100% free with no signup, and everything runs locally in your browser, so your data is never uploaded to a server.

You Might Also Need