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description=Calculate SHA-256 hash from your string. SHA-256 algorithm generates an almost-unique, fixed size 256-bit (32-byte) hash.;

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Text of the page (random words):
free string to sha 256 hash calculator online w3docs w3docs libri imparare html impara css imparare javascript imparare git imparare java imparare php imparare python corsi quiz esercizi snippet strumenti general tools html editor password generator html encoder code diff json beautifier tutti i 13 color tools color picker color converter color mixer color hex colors hsl tutti i 10 string tools string length calculator md5 hash generator sha256 hash generator string reverse url encoder tutti i 19 code formatters javascript formatter css formatter html formatter json formatter php formatter cerca in w3docs k it english en deutsch de русский ru français fr español es português pt italiano it accedi home tools string functions string to sha 256 hash generator string functions string to sha 256 hash generator compute the sha 256 hash of any string 256 bit digest hex encoded runs entirely in your browser source result clear copy submit about the sha 256 hash generator this tool computes the sha 256 hash of any string you paste in sha 256 secure hash algorithm 256 bit takes input of any length and always produces a fixed 256 bit digest shown here as 64 hexadecimal characters the same input always produces the same hash but changing even a single character a case a space produces a completely different unpredictable output the transformation only runs one way there s no operation that reconstructs the original text from the hash hashing runs entirely in your browser using the web crypto api the input is first encoded to utf 8 bytes with textencoder then passed to crypto subtle digest sha 256 bytes which returns the 32 byte digest each byte is converted to a two digit hex value and the 32 pairs are joined into the 64 character string shown in the output crypto subtle digest is asynchronous by design but for a string of any typical length it resolves essentially instantly nothing is sent over the network the whole computation happens locally so pasting sensitive text here doesn t transmit it anywhere sha 256 is useful anywhere you need a short fixed size fingerprint of arbitrary data verifying a downloaded file against a publisher s checksum generating a stable cache busting key from file content deduplicating files by comparing hashes instead of full contents or confirming two values match without comparing them directly one thing it s not suited for is hashing passwords sha 256 is deliberately fast which makes brute forcing short or predictable inputs cheap for an attacker for passwords use a purpose built algorithm like bcrypt scrypt or argon2 instead examples what the tool computes in javascript js async function sha256 input const bytes new textencoder encode input const digest await crypto subtle digest sha 256 bytes return array from new uint8array digest map b b tostring 16 padstart 2 0 join await sha256 the quick brown fox jumps over the lazy dog d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592 this mirrors what the tool runs internally verified against its actual output the same code works unmodified in node js crypto subtle is available globally there too verify the same hash from a terminal bash printf the quick brown fox jumps over the lazy dog shasum a 256 d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592 use printf not echo echo appends a trailing newline by default which changes the hash to a different value than this tool produces for the same visible text same hash in php php php echo hash sha256 the quick brown fox jumps over the lazy dog d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592 php s hash with the sha256 algorithm name returns the same lowercase hex digest as this tool frequently asked questions what is sha 256 used for sha 256 verifies that data hasn t changed comparing a downloaded file against a publisher s checksum generating a cache busting key from file content or fingerprinting a config file or commit it s also a core building block in tls certificates digital signatures and bitcoin s proof of work it is not by itself a good way to store passwords can a sha 256 hash be reversed or decrypted no sha 256 is a one way hash function not encryption so there s no key or algorithm that turns a digest back into the original text sites that claim to decrypt a sha 256 hash are really just looking it up in a precomputed table of common inputs which only works if the original text was short or guessable what s the difference between sha 256 and md5 sha 256 produces a 256 bit digest 64 hex characters md5 produces a 128 bit digest 32 hex characters and has been considered broken for security purposes since 2004 use sha 256 for anything security related md5 is only appropriate for non security tasks like a quick checksum why doesn t my hash match the one from another tool the most common cause is a trailing newline echo text shasum a 256 appends a newline character that printf text shasum a 256 does not so the two produce different hashes for text that looks identical leading or trailing whitespace and character encoding matter too this tool always encodes your input as utf 8 before hashing can this tool hash a file instead of text no it hashes whatever text you paste into the input field not file contents to hash a file from the command line use shasum a 256 file txt on macos linux or certutil hashfile file txt sha256 on windows related tools string to md5 hash generator the other hash function on this site 128 bit output instead of sha 256 s 256 bit jwt decoder jwts are commonly signed with hmac sha256 inspect a token s header and payload phrase encryptor uses sha 256 internally via pbkdf2 to derive a key but encrypts reversible unlike hashing password generator also built on the web crypto api for generating random passwords instead of hashing text learn more lesson textdecoder and textencoder how the tool converts your string to utf 8 bytes before hashing lesson arraybuffer binary arrays the binary data type crypto subtle digest returns before it s converted to hex all string functions w3docs tutorial esempi esercizi snippet e quiz gratuiti per il web dal 2014 libri imparare html impara css imparare javascript imparare git imparare java imparare php imparare python pratica esercizi quiz editor try it strumenti html editor password generator html encoder code diff json beautifier azienda informazioni contatti informativa sulla privacy lingua english deutsch русский français español português italiano 2026 w3docs tutti i diritti riservati realizzato per gli sviluppatori