Decode any Base64-encoded string back to its original text or binary file. Works instantly in your browser — no server upload. Supports UTF-8, embedded images, and binary data.
Developers frequently encounter Base64 in API responses, JWT tokens, email headers, and embedded data URIs. This tool decodes them instantly for debugging and inspection.
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How to Base64 Decode Online — Convert Back to Original Text & Files
- Paste your Base64-encoded string in the input area
- Select "Decode" mode
- Click "Convert" to see the decoded output
- For files/images: download the decoded binary output
- For text: copy the decoded string from the output area
Pro Tips
- If output looks garbled, the original was likely binary (image, PDF) not text
- Remove data:image/png;base64, prefix before decoding image strings
- Base64 strings must be valid — padding (=) at end is important
- JWT tokens have 3 Base64 parts separated by dots — decode each separately
Frequently Asked Questions
How to decode Base64 to readable text?
Paste the Base64 string into our decoder and click Convert. If the original was UTF-8 text, you will see readable output instantly.
Why does my decoded Base64 show weird characters?
The original data was likely binary (image, PDF, compressed data), not text. Try downloading it as a file instead of viewing as text.
Can I decode Base64 images?
Yes. Paste the Base64 string (without the data:image prefix) and the tool will decode it to the original image file you can download.
Is Base64 decoding done locally?
Yes, 100% in your browser. No data is sent to any server. Your encoded data stays completely private.
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