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description= Encode a string so that it conforms to the Base64 Data Encodings. Base 64 is a binary data in an ASCII string format which translates it into a radix-64…;
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free base 64 encoder online w3docs w3docs bücher html lernen css lernen javascript lernen git lernen java lernen php lernen python lernen kurse quizze übungen snippets tools general tools html editor password generator html encoder code diff json beautifier alle 13 color tools color picker color converter color mixer color hex colors hsl alle 10 string tools string length calculator md5 hash generator sha256 hash generator string reverse url encoder alle 19 code formatters javascript formatter css formatter html formatter json formatter php formatter w3docs durchsuchen k de english en deutsch de русский ru français fr español es português pt italiano it anmelden home tools string functions base 64 encoder string functions base 64 encoder encode any string to base 64 utf 8 safe multi byte characters and emoji round trip cleanly source result clear copy submit about base64 encoding this tool converts any text into base64 an encoding that represents arbitrary bytes using only 64 printable ascii characters a z a z 0 9 plus for padding it doesn t compress or scramble anything it just re represents the same bytes in a form that s safe to drop into contexts that only tolerate plain ascii text paste any string including emoji and accented characters and the encoded result appears as you type under the hood the input is first run through textencoder to get its raw utf 8 bytes then passed to the browser s built in btoa in chunks of 32 768 bytes to sidestep a call stack error on very large inputs that extra step matters calling btoa directly on a javascript string throws on any character outside the latin 1 range which is why naive btoa text snippets break on accented letters or emoji going through utf 8 bytes first avoids that so encoding and then decoding a string here reproduces it exactly multi byte characters included reach for this when you need to embed binary unsafe data inside a text only context building a basic auth header authorization basic base64 storing a small blob inside a json or xml field or passing a payload through a system that only accepts printable ascii for encoding actual image files use the dedicated image to base64 tool this one works on pasted text everything here runs in your browser nothing you paste is sent to a server so it s safe to use on tokens credentials or other sensitive strings examples encoding plain text text input hello world output sgvsbg8sifdvcmxkiq base64 always expands size 3 input bytes become 4 output characters roughly 33 overhead this 13 byte string becomes 20 base64 characters the trailing is padding utf 8 and emoji round trip cleanly text input encode me to base64 output rw5jb2rlig1lihrviejhc2u2nceg8j aga the alone is 4 utf 8 bytes because the tool encodes the utf 8 byte sequence rather than javascript s internal string representation decoding this output reproduces the original text exactly what you d otherwise write by hand js browser same technique this tool uses internally const bytes new textencoder encode str btoa string fromcharcode bytes node js buffer from str utf 8 tostring base64 php s base64_encode str gives identical output for a utf 8 encoded source string all three operate on the same underlying bytes just through different apis frequently asked questions does base64 encode or encrypt data no base64 only re represents data it doesn t scramble compress or protect it anyone can decode it back to the original text with no key required so use real encryption such as aes if you need confidentiality why does the output end with or base64 packs 3 input bytes into 4 output characters when the input length isn t a multiple of 3 bytes one or two characters are appended so the output still ends on a full 4 character group one for a remainder of 2 bytes two for a remainder of 1 byte is this the same encoding used in jwts and urls no jwts and url safe contexts use base64url rfc 4648 section 5 which swaps and for and _ and usually drops the padding this tool produces standard base64 so you d need that substitution before using its output as a jwt segment or inside a url will special characters accents or emoji break the encoding no the tool converts text to utf 8 bytes with textencoder before encoding so accented letters emoji and other multi byte characters round trip losslessly a naive btoa text call skips that conversion and throws on any character outside the latin 1 range which is a common bug in hand rolled encoders is there a limit on how much text i can encode no hard limit the tool processes input in 32 768 byte chunks internally to avoid the call stack size exceeded error a naive one shot implementation hits on very large strings so multi megabyte pastes still encode correctly just a little slower to render related tools base 64 decoder the inverse operation decode a base64 string back to plain text image to base64 encode an actual image file into a data uri instead of pasted text phrase encryptor real encryption aes 256 gcm for when base64 s reversible encoding isn t enough jwt decoder inspect a json web token which uses a url safe variant of base64 internally learn more lesson javascript textdecoder and textencoder the textencoder textdecoder apis this tool uses internally to convert text to and from utf 8 bytes lesson javascript json a common place base64 strings end up embedded as a field inside a json payload all string functions w3docs kostenlose tutorials beispiele übungen snippets und quizze für das web seit 2014 bücher html lernen css lernen javascript lernen git lernen java lernen php lernen python lernen üben übungen quizze probier editor tools html editor password generator html encoder code diff json beautifier unternehmen über uns kontakt datenschutzrichtlinie sprache english deutsch русский français español português italiano 2026 w3docs alle rechte vorbehalten für entwickler gemacht
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