Base64 Encode and Decode Online Tool
Free Base64 Encode and Decode plain text or emojis into Base64 formats, or decode encoded data sets locally securely inside your browser offline.
Transform standard text formats into generic Base64 payloads or unpack unknown targets easily.
How to Use Base64 Encode and Decode Online Tool
- Select Mode: Choose "Encode" to convert text to Base64, or "Decode" to convert Base64 back to text.
- Enter Your Text: For encoding, type or paste any text (including emojis and Unicode). For decoding, paste a Base64 string.
- Click Convert: The result appears instantly in the output field.
- Copy Result: Click "Copy to Clipboard" to copy the encoded or decoded text.
- Clear: Use the "Clear" button to reset and start over.
Frequently Asked Questions
Is my data secure when encoding or decoding?
Yes. All encoding and decoding happens 100% client-side in your browser. No data is uploaded to any server.
Is this Base64 tool free to use?
Absolutely. This tool is completely free with unlimited operations and no restrictions.
Does this work offline?
Yes, once the page loads, you can encode and decode Base64 strings entirely offline.
Does this support emojis and Unicode (UTF-8)?
Yes. The tool correctly handles emojis, non-ASCII characters, and multi-byte UTF-8 sequences. We wrap the native browser Base64 functions with UTF-8 encoding to ensure characters like “你好 🎉” encode and decode correctly.
What is Base64 encoding used for?
Base64 encodes binary data into ASCII text format, commonly used for embedding images in HTML/CSS, API authentication, and data transmission.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode it. Never use Base64 to protect sensitive data like passwords.
Why does my Base64 string end with equals signs?
The equals signs (=) are padding characters added to ensure the encoded string length is a multiple of 4.
Can I decode invalid Base64 strings?
No. Invalid Base64 strings will produce an error. Ensure the string contains only valid Base64 characters (A-Z, a-z, 0-9, +, /, =).
How do I encode binary files?
This tool handles text strings. For binary files (images, PDFs), use a dedicated Base64 file encoder tool.
What happens if I try to decode regular text?
Decoding non-Base64 text will likely produce gibberish or an error. Only decode strings that were previously Base64-encoded.