Developer
Base64 decoder
Decode Base64 strings back to plain text or binary data.
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100% private. All processing happens locally in your browser — no files or data are ever sent to a server.
How to use Base64 decoder
- 01 Paste or type your input into the text field provided
- 02 The output generates instantly as you type
- 03 Click Copy to send the result straight to your clipboard
Frequently asked questions
Common questions about Base64 decoder.
Is Base64 decoder free to use?
Yes, Base64 decoder is completely free. No account, subscription, or payment is ever required — just open the page and start using it.
Does Base64 decoder upload my data to a server?
No. Base64 decoder runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.
Can I use Base64 decoder on my phone or tablet?
Yes. Base64 decoder is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.
Does Base64 decoder work without an internet connection?
Yes. Once the page has loaded, Base64 decoder works fully offline — all processing is done locally in your browser.
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About Base64 decoder
The Base64 Decoder reverses the encoding process, converting Base64-encoded ASCII strings back into their original readable form. This is a frequent need when inspecting JWT token payloads (which are Base64url-encoded), decoding API responses that embed binary data as text, reading the contents of embedded data URIs, and debugging authentication headers in HTTP traffic. The decoded output can be copied directly or inspected to verify the original content.
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