Is Base64 encryption?

No. Base64 is encoding, not encryption. It is trivially reversible and provides no security — never use it to protect sensitive data.

Why is Base64 larger than the original?

Base64 represents every 3 bytes of data with 4 text characters, making the output roughly 33% bigger than the original binary.

Does Base64 support emoji and accents?

It can, if the encoder is Unicode-safe. Our tool handles emoji and non-Latin characters correctly in both directions.

What Is Base64 Encoding (and When Should You Use It)?

Base64 shows up all over software — in data URIs, email attachments, and tokens. It’s simple once you see what problem it solves: safely moving binary data through text-only systems.

What Base64 does

Base64 is an encoding scheme that represents binary data using only 64 plain ASCII characters (A–Z, a–z, 0–9, plus + and /). It converts arbitrary bytes — an image, a file, raw binary — into a text string that can travel safely through systems designed to handle text.

Why it exists

Many older protocols, especially email, were built to carry text, not raw binary. Sending binary through them could corrupt the data. Base64 solves this by encoding the binary as safe text on one end and decoding it back on the other. The trade-off is size: Base64 output is about 33% larger than the original, because it uses more characters to represent the same data.

Common uses

Data URIs — embedding a small image or font directly in HTML or CSS, e.g. data:image/png;base64,iVBOR..., so it loads without a separate request.
Email attachments — the MIME standard uses Base64 to encode files.
Tokens and JWTs — parts of JSON Web Tokens are Base64-encoded (technically Base64URL).
Storing binary in text fields — databases or JSON that only hold strings.

Base64 is NOT encryption

This is the most important thing to understand: Base64 provides no security. Anyone can decode it instantly — it’s just a different representation of the same data, not a secret. Never use Base64 to "hide" passwords or sensitive information. If you need secrecy, you need actual encryption.

Encode and decode in your browser

Our Base64 Encode / Decode tool converts text to Base64 and back instantly. It’s Unicode-safe, so emoji and accented characters round-trip correctly — a common pitfall with naive implementations. Everything runs locally, so nothing you paste is uploaded.

A note on Base64URL

Standard Base64 uses + and /, which have special meanings in URLs. A variant called Base64URL swaps them for - and _ so the encoded text is safe to drop into a web address — which is why you’ll see it in tokens and query strings.