Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings. Upload files to convert them to Base64, or download Base64 data as files.
Drag & drop a file here or click to select
How to Use This Base64 Tool
Base64 encoding is commonly used in web development to embed binary data in text formats like JSON, XML, HTML, and CSS. To encode text, simply type or paste it into the input area and click "Encode". The tool converts your text into a Base64 string that can be safely transmitted through text-based protocols. To decode, paste a Base64 string and click "Decode" to reveal the original content. The "Auto-Detect" button intelligently determines whether your input is already Base64-encoded and performs the appropriate operation automatically.
File to Base64 Conversion
Need to convert an image, PDF, or any file to Base64? Simply drag and drop the file onto the upload area, or click to select a file from your device. The tool reads the file entirely in your browser and produces the Base64 representation. This is useful for embedding images in CSS data URIs, sending binary attachments in JSON APIs, or storing file data in databases that only support text. You can also take a Base64 string and download it as a file, which is helpful when you receive Base64-encoded data from an API and need to save it as an actual file on your computer.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is designed to carry data stored in binary formats across channels that only reliably support text content.
Is my data secure?
Yes, all encoding and decoding happens in your browser. No files or text are uploaded to any server. Your data never leaves your device.
Why is the Base64 output larger than the input?
Base64 encoding increases data size by approximately 33% because it represents every 3 bytes of binary data using 4 ASCII characters. This overhead is the trade-off for being able to safely transmit binary data as text.