Convert Text ↔ Base64
Type or paste in either field — conversion happens instantly. Click the arrow buttons to swap direction.
What is Base64?
📦 Safe Data Transport
Base64 converts binary data into ASCII characters, making it safe to transmit over systems that only handle text (like email or URLs).
📈 33% Size Increase
Encoded data is ~33% larger than the original. Every 3 bytes become 4 Base64 characters. Keep this in mind for large files.
🔐 Not Encryption
Base64 is encoding, not encryption. Anyone can decode it. Don't use it to hide sensitive data — use proper encryption instead.
🌐 UTF-8 Support
This tool handles international characters and emojis via UTF-8 encoding. Your text is converted to bytes first, then to Base64.
Common Use Cases
| Use Case | Example |
|---|---|
| HTTP Basic Auth | Authorization: Basic dXNlcjpwYXNz |
| Data URLs (images) | data:image/png;base64,iVBOR... |
| Email Attachments | MIME encodes files for email transport |
| JSON/XML Embedding | Binary data as text in structured formats |
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed locally and should be verified for critical applications.
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Base64 Encode/Decode FAQ
What is Base64 Encode/Decode?
Base64 Encode/Decode is a free developer tools tool that helps you Encode and decode Base64 strings.
How do I use Base64 Encode/Decode?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Base64 Encode/Decode private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Base64 Encode/Decode require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Base64 Encode/Decode?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Base64 Encode/Decode?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.