Base64 Encoder / Decoder

Encode and decode Base64 strings, URLs, and files. Supports text input, file upload, and live preview. 100% client-side.

Features

• Text and file encoding / decoding
• URL-safe Base64 (- and _ instead of + and /)
• Data URI generation for images and assets
• Live preview as you type
• UTF-8 safe handling
• 100% client-side

Frequently Asked Questions

Is Base64 encryption?

No. Base64 is an encoding scheme, not encryption. It converts binary data into ASCII characters so it can travel over text-only channels, but anyone can decode it. Never use Base64 to protect secrets. Use real encryption instead.

What is the difference between standard and URL-safe Base64?

Standard Base64 uses + and /, which have special meaning in URLs. URL-safe Base64 replaces them with - and _ so the result can be embedded in URLs and query parameters without escaping.

Why does my decoded output look garbled?

This usually means a charset mismatch (the input was UTF-8 but decoded as Latin-1) or that you decoded binary data as text. Use UTF-8 mode for text and save binary output as a file.