Base64 Encoder
WEBEncode and decode text to and from Base64 instantly.
What is the Base64 Encoder tool?
Paste a Base64 string to decode it back into readable text, or paste plain text to encode it — this free Base64 decoder and encoder converts both ways, instantly, entirely in your browser. Nothing is uploaded and there is no server on the other end, so the tokens, payloads and config values you inspect stay on your device. Where other converters advertise upload size limits, this one has no upload at all.
Flip between decode and encode with a single toggle. The decoder is forgiving on purpose: it strips whitespace and line breaks and accepts the URL-safe alphabet (- and _) alongside the standard one, so a JWT segment, an email MIME block or a wrapped log line pastes straight in without cleanup. Encoding is fully UTF-8-safe, meaning Arabic text, accents and emoji convert correctly in both directions — something naive tools built on the browser's Latin-only btoa function silently corrupt.
Base64 shows up everywhere text-only channels carry binary or special characters: JWT tokens, data URLs embedded in CSS and HTML, email attachments, HTTP Basic Auth headers and API payloads. That makes this converter a daily driver for developers debugging a token or payload — and a quick answer for anyone who received a Base64 string and wants to know what it says. It is free, needs no sign-up, has no length caps, and works on your phone as well as your desktop.
How to use the Base64 Encoder
- Choose decode or encode with the toggle above the input field.
- Paste your Base64 string (to decode) or your plain text (to encode) into the field.
- The converted result appears instantly as you type or paste — no button to press.
- Tap copy to put the result on your clipboard.
- Need the other direction? Flip the toggle and convert back.
Frequently asked questions
What is Base64?
Base64 is a way of writing any data — including binary — using only 64 safe ASCII characters (letters, digits, + and /). It exists so binary data can travel through channels designed for plain text, like email bodies, JSON strings, URLs and HTTP headers.
Is Base64 encryption?
No — this is the most common misconception. Base64 is an encoding, not encryption: there is no key and no secret, and anyone can decode it instantly (this page proves it). Never use Base64 to protect passwords or private data; it only changes how data is written, not who can read it.
Why does my Base64 string end in = or ==?
That is padding. Base64 processes input in 3-byte groups that become 4 characters; when the input length is not a multiple of 3, one or two = signs pad the final block to a full 4 characters. The decoder here handles padded and unpadded strings alike.
Why does my decoded output look garbled?
The Base64 string probably encodes binary data — an image, a compressed blob, an encrypted payload — rather than human-readable text. Base64 can wrap anything; decoding reveals the original bytes, but only text bytes will look like text.
Can I decode URL-safe Base64 or strings with line breaks?
Yes. The decoder automatically converts the URL-safe characters - and _ to their standard equivalents and strips all whitespace and newlines before decoding, so JWT segments and wrapped MIME blocks work as-is.
Is the text I convert sent anywhere?
No. Encoding and decoding run as local JavaScript in your browser tab — nothing is transmitted, logged or stored. Once the page has loaded, the converter works offline too.
Is it free, and is there a size limit?
Free, no sign-up, no quota. There is no fixed size cap — because processing is local, very large strings are limited only by your browser's memory.
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