Base64 Encode
Encode text and binary data to Base64 format for safe transmission and storage in text-based systems.
Overview
Base64 Encode converts plain text or binary file data into Base64-encoded ASCII strings — the format required by email protocols (MIME), data URIs for inline images, JSON payloads, and HTTP Basic Authentication headers. The entire encoding operation runs locally inside your browser using native JavaScript, so your sensitive strings, tokens, certificates, or file contents are never transmitted to any server. Paste your text or drop a file, and the encoded result is ready to copy or download in an instant.
Common Use Cases
- Embed Images in HTML/CSS — Encode image files to Base64 data URIs so they can be inlined directly into HTML img tags or CSS background-image rules without a separate HTTP request.
- Encode API Credentials — Construct HTTP Basic Authentication headers by encoding a username:password pair to Base64 before passing it in the Authorization header.
- Prepare JSON Payloads — Encode binary blobs or multi-line strings to Base64 so they can be safely embedded as string values inside JSON or XML without escaping issues.
- MIME Email Attachments — Convert file content to Base64 for use in MIME-encoded email attachments, where raw binary data cannot be sent directly over text-based SMTP.
- Encode Private Keys or Tokens — Safely encode sensitive strings such as API keys, JWT secrets, or certificate fragments to Base64 without exposing them to an external service.
How It Works
Input Your Data
Paste text or upload a file that you want to encode to Base64 format.
Automatic Encoding
The tool instantly converts your data to Base64 encoding using browser-based processing.
Copy or Download
Copy the encoded result to clipboard or download it as a text file.
