🔒 Free Online Base64 Encoder

Encode text and files to Base64 instantly — UTF-8 safe, URL-safe output, 100% browser-based

Need a fast, reliable base64 encoder? This free tool lets you encode to Base64 instantly — no downloads, no sign-ups, and no data ever leaves your browser. Whether you're embedding images in HTML as data URIs, preparing API payloads, or converting text for text-based protocols like SMTP and MIME, this online base64 encoder gets the job done with zero friction.

Base64 encoding converts binary data or text into a 64-character ASCII string using characters A–Z, a–z, 0–9, +, and /. It's the universal standard for safe data transmission across text-based systems — used everywhere from email attachments to JSON Web Tokens, Kubernetes secrets, web fonts, and inline SVG images. Unlike a basic base64 encode tool, ours handles Unicode text (emojis, Chinese characters, special symbols) correctly by encoding through UTF-8 first — no more broken output from btoa().

This base64 encoder also supports file-to-Base64 conversion — drop any image, PDF, or binary file and get a ready-to-use Base64 string or data URI. Every operation runs client-side in JavaScript, so your sensitive content stays private. Bookmark this free base64 encoder for your daily dev workflow — it works entirely offline once loaded and requires no network connection after the initial page visit.

💡 Need to decode instead? Visit our dedicated Base64 Decoder page — optimized for base64 decode with 60,500 monthly searches!

🚀 How to Use This Base64 Encoder

  1. Paste or type your text in the input field above — it handles plain text, JSON, XML, and special characters.
  2. Click Encode to Base64 — the tool instantly converts your input using UTF-8 safe encoding.
  3. Copy the Base64 output with one click. Use it in data URIs, API requests, or anywhere Base64 is needed.
  4. For files, switch to the File → Base64 tab, select any file, and get an instant Base64 string.

📋 Supported Use Cases