Encode text or strings to Base64 format instantly
A Base64 encoder converts text or binary data into Base64 — an encoding that represents any data using only 64 safe ASCII characters (A–Z, a–z, 0–9, + and /). Many protocols and formats can only transport plain text: email attachments (MIME), data URLs in HTML and CSS, JSON payloads, HTTP Basic Authentication headers and JWT tokens all rely on Base64 to smuggle binary or special-character content through text-only channels without corruption.
It is important to understand that Base64 is encoding, not encryption: anyone can decode it instantly, so it provides zero confidentiality. Its job is purely to make data safe for transport. The conversion happens entirely in your browser — nothing you encode is ever uploaded — and the companion Base64 decoder reverses the process.
No — this is the most common misconception. Base64 is a reversible encoding anyone can decode without a key. It protects data integrity during transport, not confidentiality. For secrets, use real encryption like AES.
Base64 processes input in 3-byte blocks producing 4 characters. When the input length isn't divisible by 3, the output is padded with one or two = characters to complete the final block.
About 33% larger: every 3 bytes of input become 4 characters of output. That is the price of representing arbitrary data with only 64 safe characters.
Yes. Text is encoded as UTF-8 bytes before the Base64 conversion, so accented characters, non-Latin scripts and emoji encode and decode correctly.
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