Can a hash be reversed back into the original data?

No. A hash is a one-way fingerprint — it is designed so that the original data cannot be recovered from it. The same input always produces the same hash, but there is no way to work backwards from the hash to the input.

SHA-256, along with SHA-384 and SHA-512, is a modern, widely trusted hash algorithm used throughout the web and in cryptography. Older algorithms like MD5 and SHA-1 are considered weak and are not offered here.

Are selected files uploaded?

No. Files are read and hashed directly in your browser using the Web Crypto API. They are never sent to Stay Local Tools servers.

Is hashing the same as encryption?

No. Encryption is reversible with the right key — you can decrypt encrypted data back to the original. Hashing is one-way: a hash cannot be turned back into the original data at all. Hashes are commonly used to check that a file has not changed, not to hide its contents.

Hash Generator

Make SHA-256, SHA-384 and SHA-512 hashes from text or a file.

Local Processing

Your input is processed in your browser.

Algorithm

A hash is a one-way fingerprint of data — it cannot be turned back into the original.

Text

Private by design

Your data is processed directly in your browser. It is not sent to Stay Local Tools servers for processing. Because the work happens on your device, nothing you type here leaves your browser unless you choose to copy or share it yourself.

Note: the website itself still loads normal web files, and may use analytics or ads later. The promise here is about the files and text you put into these tools.

How to Use

Choose an algorithm: SHA-256, SHA-384 or SHA-512.
Choose Text or File, then enter your text or pick a file.
The hash appears automatically.
Copy the result.

What is hashing?

A hash is a one-way fingerprint of data. Feeding the same text or file into a hash algorithm always produces the same fixed-length result, but there is no way to work backwards from that result to recover the original data. Hashes are used to check that a file has not been changed, to compare two files without sharing their contents, and as a building block inside many security systems.

Hashing vs encryption

Encryption is reversible: with the right key, encrypted data can be turned back into the original. Hashing is one-way and has no key — a hash can never be decoded back into the original text or file. Do not use a hash as a way to hide or store secret data; use it only to verify or compare data.

SHA-256, SHA-384 and SHA-512

These are three sizes of the SHA-2 family of hash algorithms, all considered secure and widely used today. SHA-256 produces a 256-bit (64 character) result, SHA-384 produces a 384-bit (96 character) result, and SHA-512 produces a 512-bit (128 character) result. Older algorithms such as MD5 and SHA-1 are known to be weak and are not offered here.

Questions and Answers

: No. A hash is a one-way fingerprint — it is designed so that the original data cannot be recovered from it. The same input always produces the same hash, but there is no way to work backwards from the hash to the input.
: SHA-256, along with SHA-384 and SHA-512, is a modern, widely trusted hash algorithm used throughout the web and in cryptography. Older algorithms like MD5 and SHA-1 are considered weak and are not offered here.
: No. Files are read and hashed directly in your browser using the Web Crypto API. They are never sent to Stay Local Tools servers.
: No. Encryption is reversible with the right key — you can decrypt encrypted data back to the original. Hashing is one-way: a hash cannot be turned back into the original data at all. Hashes are commonly used to check that a file has not changed, not to hide its contents.

Other Languages

Español

Generador de hash SHA-256

Genera hashes SHA-256, SHA-384 y SHA-512 a partir de texto o un archivo. El contenido se procesa directamente en tu navegador y no se sube a los servidores de Stay Local Tools para el procesamiento.

Preguntas frecuentes

: No. Un hash es una huella de un solo sentido: no se puede recuperar el dato original a partir de él. La misma entrada siempre produce el mismo hash.
: SHA-256, junto con SHA-384 y SHA-512, es un algoritmo de hash moderno y muy confiable, usado ampliamente en la web y en criptografía.
: No. Los archivos se leen y se calculan directamente en tu navegador con la Web Crypto API. Nunca se envían a los servidores de Stay Local Tools.

Português (Brasil)

Gerador de hash SHA-256

Gere hashes SHA-256, SHA-384 e SHA-512 a partir de texto ou um arquivo. O conteúdo é processado diretamente no navegador e não é enviado aos servidores do Stay Local Tools para processamento.

Perguntas frequentes

: Não. Um hash é uma impressão digital de mão única: os dados originais não podem ser recuperados a partir dele. A mesma entrada sempre gera o mesmo hash.
: O SHA-256, junto com o SHA-384 e o SHA-512, é um algoritmo de hash moderno e muito confiável, amplamente usado na web e em criptografia.
: Não. Os arquivos são lidos e processados diretamente no navegador usando a Web Crypto API. Eles nunca são enviados aos servidores do Stay Local Tools.

한국어

SHA256 해시 생성

텍스트나 파일로 SHA-256, SHA-384, SHA-512 해시를 생성할 수 있습니다. 내용은 브라우저에서 직접 처리되며 Stay Local Tools 서버에 업로드되지 않습니다.

자주 묻는 질문

: 아니요. 해시는 한 방향으로만 작동하는 지문 같은 것이라 원본 데이터를 복원할 수 없습니다. 같은 입력은 항상 같은 해시를 만듭니다.
: SHA-256은 SHA-384, SHA-512와 함께 웹과 암호학 전반에서 널리 신뢰받는 최신 해시 알고리즘입니다.
: 아니요. 파일은 Web Crypto API를 사용해 브라우저에서 직접 읽고 해시를 계산하며, Stay Local Tools 서버로는 전송되지 않습니다.