Encode to Base64 format

Simply enter your data then push the encode button.

To encode binaries (like images, documents, etc.) use the file upload form a little further down on this page. Destination character set. Destination newline separator. Encode each line separately (useful for when you have multiple entries). Split lines into 76 character wide chunks (useful for MIME). Perform URL-safe encoding (uses Base64URL format). Encodes in real-time as you type or paste (supports only the UTF-8 character set). Encodes your data into the area below.

Encode files to Base64 format

Select a file to upload and process, then you can download the encoded result.

0 Click (or tap) here to select a file

The maximum file size is 192MB. Destination character set for text files. Split lines into 76 character wide chunks (useful for MIME). Perform URL-safe encoding (uses Base64URL format).

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About Base64 encoding

Base64 encoding converts arbitrary bytes into a string built from 64 printable ASCII characters (A-Z, a-z, 0-9, +, and /), padded with = when needed. Each group of 3 input bytes becomes 4 output characters, which is why Base64 output is roughly 33% larger than the original data - a normal, expected trade-off for text-safe transport, not a sign of a problem.

Encoding is useful whenever binary or special-character data needs to pass through a channel that only reliably supports plain text: embedding an image inside CSS with a data URL, attaching a file to an email, sending binary payloads inside JSON, or building HTTP Authorization: Basic headers.

Encoding options on this page

Character set - choose the source encoding (UTF-8 by default) before conversion.
Base64URL - swaps +// for URL-safe characters, for use in URLs, filenames, and tokens.
Line chunking - wraps output at 76 characters, matching the MIME standard used by email clients.

Base64 encoder FAQ

When should I use Base64?

Use Base64 when binary data must travel through a text-only format, such as JSON, email, or a data URL. It increases size, so it is not a replacement for file storage.

What is the difference between Base64 and Base64URL?

Base64URL replaces + and / with URL-safe characters and usually omits padding. Choose it for URL parameters, tokens, and systems that require URL-safe values.

Why is the encoded output longer than my original text?

Base64 turns every 3 bytes of input into 4 output characters, so encoded data is roughly 33% larger than the source. This overhead is expected and is the trade-off for safe text-only transport.

What's the difference between encoding text and encoding a file?

Both use the same algorithm. The text form encodes what you type or paste using the selected character set; the file form reads the file's raw bytes directly, which is required for images, PDFs, and other binary formats.

Will special characters or non-English text encode correctly?

Yes, as long as the correct source character set is selected; UTF-8 covers virtually all languages and symbols. If output looks wrong, confirm the charset matches how your original text is encoded.

Is this tool free, and does it store what I encode?

Yes, it is free with no account required. Encoding runs locally in your browser; your input is not intentionally sent to or stored by our servers. See our Privacy Policy for details.