Text to Encode 0 chars
How to Use This Base64 Encoder
- Choose Encode or Decode — Use the tabs above to switch modes. The tool also auto-detects: if your input looks like Base64, it switches to Decode automatically.
- Enter your text — Encode mode: type or paste any text (Unicode, emoji, etc.). Decode mode: paste a Base64 string.
- For files, click Upload File — In Encode mode, upload any file (image, PDF, etc.) to convert it to a Base64 data URL. The encoded string can be embedded directly in HTML, CSS, or JSON.
- Copy, Swap, or Clear — Click Copy to copy the result, Swap to flip input and output (useful for round-trip testing), or Clear to reset.
Tip: Use Ctrl + Enter to trigger encode/decode, or Ctrl + , to swap input/output.
Why Use This Base64 Encoder?
Proper Unicode support
Many Base64 tools fail with non-Latin text because they use JavaScript's btoa() directly, which only handles Latin-1 characters. This tool properly encodes to UTF-8 bytes first, so Chinese, Japanese, Korean, Arabic, and emoji characters work correctly.
Complete privacy
All processing happens in your browser. Your text and files never leave your device — no uploads, no server logs, no tracking. Safe for sensitive data, API keys, and proprietary documents.
File to Base64 conversion
Upload any file to encode it as a Base64 data URL. The output includes the MIME type and can be embedded directly in HTML <img> tags, CSS url() values, or JSON payloads.
Auto-detect and URL-safe support
The tool detects whether your input is plain text, standard Base64, or URL-safe Base64 (using - and _ instead of + and /), and handles each case automatically.
Frequently Asked Questions
Base64 is used to represent binary data as ASCII text. Common uses include: embedding images in HTML/CSS with data URLs, sending attachments in email (MIME), storing binary data in JSON or XML, encoding credentials in HTTP Basic Auth headers, and transmitting binary data through text-only channels.
Base64 uses 64 characters (6 bits each) to represent data that originally uses 8 bits per byte. Every 3 original bytes become 4 Base64 characters: 3 × 8 = 24 bits → 4 × 6 = 24 bits. The 4/3 ratio means ~33.3% size increase.
Yes. The encoding is fully reversible. Switch to Decode mode, paste your Base64 string, and the original text is restored. This tool uses UTF-8 for text encoding, so any Unicode text round-trips perfectly.
Standard Base64 uses +, /, and = padding. URL-safe Base64 (RFC 4648 §5) replaces + with - and / with _, and often omits padding. This makes it safe for URLs and filenames without percent-encoding.
Yes, completely free. No signup, no download, no limits on usage.
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