What is URL-safe Base64?

URL-safe Base64 replaces the + and / characters with - and _, making the encoded string safe for use in URLs and filenames without additional encoding.

Why does Base64 increase file size?

Base64 encoding increases data size by approximately 33% because it represents 3 bytes of binary data as 4 ASCII characters.

Can I encode binary files?

Yes. Use the File mode to drag and drop any file. The tool will produce a Base64 data URI that includes the MIME type.

// base64

Base64 Encode / Decode

Encode text or files to Base64, or decode Base64 strings.

URL-safe

Input

Output

How to Use Base64 Encoder / Decoder

Choose mode-Select Text mode for string encoding or File mode for file encoding.
Select operation-Switch between Encode and Decode tabs.
Enter data-Type or paste text, or drag and drop a file.
Copy result-The result appears automatically. Click Copy to copy it.

About Base64 Encoder / Decoder

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It is widely used in web development for embedding images, sending email attachments, and encoding API tokens.

This tool supports both standard Base64 and URL-safe Base64 (replacing + and / with - and _). It can also encode files directly to Base64 data URIs.

All encoding and decoding happens in your browser. No data leaves your device.

FAQ

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