Convert any text, file, or binary data to Base64 encoding instantly in your browser. No server upload, no sign-up needed. Supports UTF-8 characters, images, PDFs, and any binary file.
Base64 encoding is used to embed images in HTML/CSS, transmit binary data in JSON/XML, encode email attachments (MIME), and store binary data in text-only databases.
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How to Base64 Encode Online — Free, Instant, No Upload
- Paste your text or upload a file in the input area
- Select "Encode" mode
- Click "Convert" to generate the Base64 string
- Copy the Base64 output to clipboard
- Use in your HTML, CSS, API call, or email system
Pro Tips
- Base64 increases data size by ~33% — only use when you need text-safe encoding
- For images in CSS, prefix with data:image/png;base64, before the encoded string
- UTF-8 text with special characters encodes perfectly — no data loss
- Large files (>5MB) may slow your browser — split into chunks if needed
Frequently Asked Questions
What is Base64 encoding?
Base64 converts binary data into ASCII text using 64 printable characters (A-Z, a-z, 0-9, +, /). It is used when binary data needs to be stored or transmitted as text.
Why does Base64 make files larger?
Base64 uses 4 characters to represent every 3 bytes of data, resulting in ~33% size increase. The tradeoff is universal text compatibility.
Is Base64 encoding secure?
No. Base64 is encoding, not encryption. Anyone can decode it. Never use Base64 alone to protect sensitive data — use proper encryption instead.
Does this tool upload my data?
No. All encoding happens 100% in your browser using JavaScript. Your data never leaves your device.
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