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Base64 Encoder
Encode text to Base64, including URL-safe output.
Quick Tool Overview
The Base64 Encoder converts text into the 64-character alphabet that lets binary travel through text-only channels — email, JSON, data URIs and HTTP headers. Text is encoded as UTF-8 first, which is the only correct way and the step naive encoders skip.
- What it does
- Encodes text into Base64
- You give it
- Any text, in any language
- You get back
- The Base64 string, standard or URL-safe
- Best for
- Data URIs, API payloads and email attachments
About the Base64 Encoder
Base64 turns arbitrary data into 64 printable characters, which is how binary travels through systems that only accept text: email attachments, JSON payloads, data URIs and HTTP headers all rely on it.
This encoder handles the two things that catch people out. Non-English text is encoded as UTF-8 first, which is the only correct way — the naive approach fails outright on any character above 255. And the URL-safe variant is available, which swaps the + and / characters for - and _ so the result can go in a URL or a filename without being percent-encoded. Line wrapping at 76 characters is there too, which the MIME email standard requires.
Key features of the Base64 Encoder
Correct UTF-8 handling
Text becomes UTF-8 bytes before encoding, so non-English input works rather than throwing an error.
URL-safe variant
Swaps + and / for - and _ so the result is safe in a URL or a filename, which is what JWTs use.
MIME line wrapping
Wrap at 76 characters when the output is going into an email, as the standard requires.
Optional padding removal
Drop the trailing = characters for the contexts that omit them.
Size shown
The encoded length beside the original, so the roughly one-third overhead is visible before you commit to it.
How to use the Base64 Encoder
-
1
Paste your text
Any text, in any language — UTF-8 is handled correctly.
-
2
Choose the variant
Standard Base64, or the URL-safe alphabet for use in a URL or filename.
-
3
Set the line wrapping
Wrap at 76 characters for MIME email, or leave it as one continuous string.
-
4
Copy the result
The encoded size is shown, which is always about a third larger than the input.
Frequently asked questions
No. It is an encoding, not a cipher — anyone can decode it instantly and no key is involved. Never use it to hide a password or anything else that matters.
Base64 represents every three bytes as four characters, so the output is about 33 per cent larger, plus padding. That overhead is the price of being able to send binary through a text-only channel.
A variant that replaces + with - and / with _, because those two characters have special meanings in a URL. The padding = is often dropped too. It is what JWTs use.
The text is encoded as UTF-8 bytes first, then those bytes are Base64 encoded. That is the standard and correct approach; encoders that skip it fail on any character above 255.
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