Base64 Encoder Decoder Online
Encode text to Base64 or decode Base64 strings. Used for API auth headers, JWT, data URIs. Private, instant.
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About Base64 Encoder & Decoder Online
Encode any text to Base64 and decode Base64 back to text. Used in HTTP Basic Auth, JWT tokens, data URIs, email MIME encoding. All encoding is local — nothing transmitted.
Base64 Encoder & Decoder Online is a free, browser-based utility that requires no login, no signup, and no installation. All processing happens entirely within your web browser using JavaScript — your data never leaves your device. The tool works on all screen sizes including mobile phones, tablets, and desktop computers.
How to use
- Enter your values in the input fields — results update instantly as you type.
- No submit button needed. The tool calculates in real time.
- Copy your result or share it via WhatsApp or Twitter using the buttons above.
- Use the workflow links below to chain into related tools for a complete task.
- All processing is browser-only. Nothing you enter is sent to any server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
Is Base64 encryption?
No. Base64 is encoding not encryption. Anyone can decode it without a key. Never use Base64 to secure sensitive data.
Why does Base64 end with ==?
Padding characters (=) make output length a multiple of 4. One = means 2 leftover bytes; == means 1 leftover byte.
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