Base64 Decoder Online
Decode Base64 strings to plain text instantly. Free online Base64 decoder that handles standard and URL-safe Base64 encoding.
Base64 Input
20 characters
About This Tool
Mode: decode
Base64 encoding converts binary data to ASCII text, making it safe for text-based systems like JSON, XML, and URLs.
Decoded Output
Enter Base64 string to see the decoded result here.
Frequently Asked Questions
How do I decode Base64?
Simply paste your Base64 encoded string into the input field and the decoded text will appear automatically. Our decoder handles both standard and URL-safe Base64.
Why does my decoded text show strange characters?
If the original data was binary (like an image), decoding it as text will show garbage characters. Use our Base64 to Image tool for image data.
Can I decode Base64 without padding (=)?
Yes, our decoder automatically handles Base64 strings with or without padding characters. URL-safe Base64 often omits padding.
What's the difference between Base64 and Base64URL?
Standard Base64 uses + and / characters, while Base64URL uses - and _ instead. Our decoder handles both formats automatically.
Practical Examples
Debug API Responses
Decode Base64 encoded data from API responses to inspect the contents.
JWT Token Inspection
Decode the header and payload parts of JWT tokens to see their contents.
Email Content Recovery
Decode MIME-encoded email content to read the original message.
Common Issues & Solutions
Make sure your input contains only valid Base64 characters (A-Z, a-z, 0-9, +, /, =, -, _).
Whitespace and line breaks are automatically removed before decoding.
If decoding fails, check that the Base64 string wasn't truncated or corrupted.
For binary data like images, use the specialized Base64 to Image decoder instead.