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 encoding converts binary or text data into an ASCII string using 64 printable characters, which is necessary because many systems — HTTP headers, JSON payloads, email (MIME), and older text-only protocols — can't reliably transmit raw binary data. It shows up constantly in real development work: HTTP Basic Authentication headers are Base64-encoded credentials, JWT tokens are Base64URL-encoded JSON, and small images are sometimes embedded directly into HTML or CSS as Base64 data URIs to avoid an extra network request. It's worth noting Base64 is an encoding, not encryption — it provides no security, only a safe transport format, so anyone can decode it instantly. This tool handles both directions and works entirely in your browser without sending data anywhere.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a 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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