Base64 Decoder
Decode Base64 to text or binary data instantly with our free online tool.
All conversions happen in your browser. No data is sent to our servers. Press Cmd/Ctrl + Enter to convert.
How to Decode Base64
Paste your Base64-encoded string into the input panel and click Convert. The decoded text appears instantly. For binary data, a download option is provided.
What is Base64?
Base64 is an encoding that represents binary data as ASCII text. Decoding reverses this process, converting the Base64 string back to its original binary or text form.
Recognizing Base64
Base64 strings contain only A-Z, a-z, 0-9, +, and / characters, often ending with = or == padding. They're typically longer than the original data.
Common Use Cases
Decode Base64 when inspecting API responses, extracting embedded images, debugging authentication tokens, or reversing encoded configuration values.
Frequently Asked Questions
What if my Base64 is invalid?
The converter will show an error if the input contains invalid Base64 characters or has incorrect padding. Valid characters are A-Z, a-z, 0-9, +, /, and = for padding.
Can I decode Base64 images?
Yes, if the Base64 represents an image, the decoded result will be displayed as an image preview along with the option to download it.
Is Base64 URL-safe decoded correctly?
Yes, the decoder handles both standard Base64 and URL-safe Base64 (which uses - and _ instead of + and /).
What about non-text binary data?
Binary data is decoded correctly. If it's not valid text, you'll see a download option for the binary file.