Base64 Decoder
Decode Base64 strings back to readable text instantly.
What is the Base64 Decoder Tool?
Our free online Base64 Decoder allows you to instantly decode Base64 encoded strings back to their original plain text. It is an essential utility for inspecting web tokens, API payloads, or cookies directly in your browser.
How to Use Base64 Decoder
- 1Paste your Base64 encoded string into the input text area.
- 2The tool automatically decodes the input in real-time.
- 3Copy the decoded plain text or download it directly to your device.
Common Use Cases
- •Decoding authorization headers to verify transmission credentials.
- •Extracting structured JSON payloads from encoded API parameters.
- •Inspecting or recovering plain text strings from encoded cookie data.
🔒 Privacy & Processing Notice
This tool processes all data entirely in your browser using client-side JavaScript. Your input is never uploaded to any server, ensuring 100% privacy and confidentiality. No data is stored, logged, or transmitted.
Frequently Asked Questions
What is Base64 decoding?
Base64 decoding is the reverse process of Base64 encoding, converting ASCII strings back into their original binary or text representation.
Can all Base64 strings be decoded?
Yes, provided the input contains only valid Base64 characters (A-Z, a-z, 0-9, +, /, and the = padding symbol) and has a valid length.
Does the decoder support UTF-8?
Yes, our decoder includes encoding-aware parsing to correctly display multi-byte UTF-8 Unicode characters without corruption.
Is Base64 Decoder free to use?
Yes, Base64 Decoder is 100% free with no signup required.
Is my data safe?
All processing happens in your browser. Your data never leaves your device.
Does it work offline?
Once the page loads, Base64 Decoder works entirely client-side.