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description=Decode a string to Base 64 data with this easy to use tool. 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 decoder 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 decoder string functions base 64 decoder decode a base 64 string back to plain text invalid input gets a clear error instead of silent garbage source result clear copy submit about the base 64 decoder this tool decodes a base64 encoded string back into plain text base64 represents arbitrary bytes using 64 printable ascii characters a z a z 0 9 with used for padding which is why you ll run into it in data uris email attachments mime basic auth headers and encoded api payloads contexts that can t safely carry raw binary or line breaks paste the encoded string in and the tool reverses the encoding back to readable text decoding runs through the browser s built in atob function which turns the base64 text into a raw byte string those bytes are then read with a textdecoder set to utf 8 so multi byte characters accented letters emoji non latin scripts reconstruct correctly instead of coming out as single byte junk the input is first stripped of whitespace and checked against the standard base64 alphabet so text wrapped at a fixed column width still decodes anything outside that alphabet including the _ characters used by base64url throws an error instead of returning corrupted text reach for this when debugging a data uri unpacking a basic auth authorization header checking what a base64 encoded environment variable or api field actually contains or confirming that something you encoded elsewhere round trips correctly decoding happens entirely client side in your browser the string you paste is never sent to a server so it s safe to use on tokens credentials or other sensitive payloads examples decode a plain ascii string text input sgvsbg8sifdvcmxkiq output hello world the inverse of the base 64 encoder for the same input decode utf 8 text with an emoji text input rw5jb2rlig1lihrviejhc2u2nceg8j aga output encode me to base64 multi byte characters decode correctly the bytes are read through a utf 8 textdecoder not one byte at a time the same decode in plain javascript js browser what this tool does under the hood const b64 sgvsbg8sifdvcmxkiq const bytes uint8array from atob b64 c c charcodeat 0 const text new textdecoder utf 8 decode bytes console log text hello world node js const text2 buffer from b64 base64 tostring utf 8 both verified to produce identical output to this tool frequently asked questions why do i get an invalid base64 input error the text contains a character outside the standard base64 alphabet a z a z 0 9 or its length isn t valid once padding is accounted for a common cause is pasting base64url encoded text which uses and _ in place of and can i decode a jwt with this tool only sometimes jwts use base64url encoding which replaces with _ and usually omits padding so any segment containing or _ throws an error here for reliable jwt decoding use a decoder built for the base64url variant is it safe to paste tokens or passwords into this decoder yes decoding runs entirely in your browser using the built in atob and textdecoder apis so the text you paste is never sent to a server why does the decoded text show a character instead of readable text that s the unicode replacement character shown when the decoded bytes aren t valid utf 8 it usually means the base64 encodes binary data an image a compiled file encrypted bytes rather than plain text do i need the padding at the end of a base64 string no the decoder accepts base64 with or without trailing padding as long as the unpadded length is otherwise valid for example both sgvsbg8 and sgvsbg8 decode to hello related tools base 64 encoder encode plain text to base64 the inverse operation jwt decoder decodes the base64url variant this tool rejects image to base64 converter generates the data uris this tool is often used to inspect hex to text decoder a different binary to text encoding hex instead of base64 learn more lesson textdecoder and textencoder the exact api this decoder uses to turn bytes back into utf 8 text lesson arraybuffer binary arrays how the decoded bytes are represented before textdecoder reads them 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