Base64 Encoder

Securely transform text and files to Base64 or decode strings back to their original format. All conversion happens locally.

Input Source
Result Output
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Base64 Encoder/Decoder - Fast & Secure Online Tool

How to Use It

Welcome to our advanced Base64 Encoder/Decoder. This tool handles everything from simple text to binary files and images.

Step 1: Choose 'Encode' to turn text or files into Base64, or 'Decode' to convert strings back to their original format.

Step 2: Type your text, paste a string, or drag & drop a file (up to 10MB) directly into the input area.

Step 3: Toggle 'URL Safe' or 'Include Data Prefix' if needed for your specific use case.

Step 4: Use 'Download Text' for a .txt file or 'Download File' to recover original binary formats.

Privacy Notice: All processing is performed client-side. Your data never leaves your computer.

Frequently Asked Questions

What is Base64 encoding used for?

Base64 is used to encode binary data into ASCII text format. It is essential for embedding images in HTML/CSS, sending binary attachments in emails, and transmitting data over protocols that only support text.

How can I convert an image or file to Base64?

Our tool makes it easy: simply click the 'Upload' button or drag any file into the input zone. It will instantly generate the Base64 representation, which you can copy or download as a text file.

Is it safe to use this online converter for sensitive data?

Absolutely. Unlike other tools that upload your files to a server, AuxiTools processes everything locally in your browser. Your data remains completely private.

What is the difference between 'Download Text' and 'Download File'?

'Download Text' always saves the output as a plain .txt file. 'Download File' is smarter: in Decode mode, it attempts to recover the original binary file (like .png or .pdf) based on the Data URL metadata.

Can I preview images from Base64 strings?

Yes! If you paste a Base64 Data URI or upload an image file, an automatic image preview will appear below the output for easy verification.

Examples

"Example: Encoding 'Hello' results in 'SGVsbG8='. Decoding 'SGVsbG8=' brings back your original text."

"For developers: Check the 'Include Data Prefix' option to generate ready-to-use <img> src strings for your web projects."