Online Base64 Encoder

Encode text to Base64.

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How to use

Paste or type your input in the left editor
Adjust options in the toolbar if available
Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About Base64 Encode

Encode text to Base64.

The Base64 encoder reads your input as a stream of bytes and processes them in groups of three. Each 3-byte group (24 bits) is divided into four 6-bit values, and each 6-bit value is mapped to a character in the Base64 alphabet (A-Z, a-z, 0-9, +, /). If the input length is not a multiple of three, padding characters (=) are appended. For text input, the string is first converted to its UTF-8 byte representation before encoding.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample text

Hello, 世界

Example input shown above. Output appears in the right pane instantly.

Why this tool?

Feature	Base64 Encode	Typical alternatives
Free online tool	Yes	Often yes
Client‑side only (privacy)	Yes	Varies
No sign‑up required	Yes	Varies

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FAQs

What is Base64 encoding used for?

Base64 encoding converts binary data into ASCII text, making it safe to transmit through text-based protocols like email (MIME), embed in JSON or XML, include in data URIs for CSS/HTML, and store in databases that only support text fields.

Does Base64 encoding encrypt my data?

No. Base64 is an encoding scheme, not encryption. The encoded output can be trivially decoded back to the original data by anyone. For security, encrypt your data with a proper cipher before Base64 encoding it.

How much larger is Base64-encoded data compared to the original?

Base64 encoding increases data size by approximately 33%. Every 3 bytes of input produce 4 bytes of Base64 output. This size overhead is the trade-off for safe text-based transmission of binary data.

Can I Base64 encode files like images or PDFs?

Yes. You can encode any file to Base64, including images (PNG, JPEG, GIF, SVG), PDFs, fonts, and other binary files. The resulting Base64 string can be used in data URIs, embedded directly in HTML or CSS.

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

Standard Base64 uses + and / characters which have special meaning in URLs. URL-safe Base64 replaces these with - and _ respectively, making the encoded string safe for use in URLs and filenames without additional percent-encoding.