Base64 Converter is a free online tool to quickly encode or decode text and files in Base64 format. It’s useful for developers who need to transform data to Base64 (for embedding binary data in text form) or decode Base64 back to original form. All processing is done in your browser for speed and privacy.
Convert text and files to and from Base64 encoding with support for multiple character encodings.
Input
Output
Copied to clipboard!
What is Base64 encoding and why use it?
Base64 encoding is a way to represent binary data (like images or files) in text form using only 64 ASCII characters. It’s commonly used to embed images in HTML/CSS, include attachments in emails (MIME), or store binary data in JSON. Developers use Base64 to ensure data remains intact when transmitted over text-only systems.
Auto Detect: Automatically determines if the input is Base64 encoded
Encode: Force Base64 encoding of the input
Decode: Force Base64 decoding of the input
Select your character encoding:
UTF-8 (default, recommended for most uses)
ASCII
ISO-8859-1
UCS-2
View the result below the input area
Click “Copy Result” to copy the converted text to the clipboard
Or click “Download” to download as file.
Encode/Decode File Content
Click “Upload File” to select a text file
The file content upload status will be shown in the input area with converted data on the output area.
Conversion happens automatically based on your selected mode and encoding
How Base64 Conversion Works:
Base64 encoding is a method for converting binary data (such as images, files, or any non-text data) into an ASCII string format using a set of 64 characters (A–Z, a–z, 0–9, +, and /). It works by taking input bytes, grouping them into sets of three (24 bits), and then dividing those into four groups of six bits. Each 6-bit group is then mapped to a character from the Base64 alphabet. Padding with = is used if the input data isn’t a multiple of three bytes.
Decoding is the reverse process: the encoded Base64 string is processed in groups of four characters, each mapped back into a 6-bit value and then combined to reconstruct the original bytes.
Example Conversion:
The text ‘Hello’ encodes to SGVsbG8= in Base64. Decoding SGVsbG8= will return ‘Hello’.
Character Encodings
UTF-8: Universal character encoding, supports all Unicode characters (default)
ASCII: Basic 7-bit encoding, supports English characters and common symbols
ISO-8859-1: 8-bit encoding, supports Western European characters
No – Base64 is not encryption. It’s an encoding scheme for data representation, not meant for security. It merely converts data to a text format; it does not hide or protect the data
What are common uses of Base64?
Base64 is commonly used to safely encode binary data for transmission over text-based protocols such as email or URLs. E.g. embedding images in web pages (as data URIs), sending email attachments in SMTP (MIME base64), storing small blobs in JSON or config files, etc.
Does this tool send my data to a server?
No. The conversion happens entirely in the browser (client-side). This means your input is not uploaded, ensuring privacy.