Is SHA-1 still secure?

No — SHA-1 is considered weak against determined attackers for security-critical uses like certificates, though it remains common for non-security checksums.

Why is my hash always 40 characters?

SHA-1 always produces a 160-bit hash, represented as 40 hexadecimal characters, regardless of input length.

Is this the same algorithm Git uses?

Yes — Git historically identifies commits using SHA-1 hashes, though newer Git versions support SHA-256 as well.

Is my text uploaded anywhere?

No — hashing uses your browser's built-in Web Crypto API and never leaves your device.

Can I reverse a SHA-1 hash back to the original text?

Not directly — hashing is one-way by design.

What should I use instead of SHA-1 for security?

Use SHA-256 or SHA-512 for new security-sensitive applications.

Générateurs de Hachage

Générateur SHA-1 — Outil en Ligne Gratuit

Générez un hachage SHA-1 à partir de tout texte via l'API Web Crypto.

Utiliser Cet Outil

Fonctionne dans Votre Navigateur
Résultats Instantanés
100% Privé

Your Text

Uppercase output

What Is a SHA-1 Hash?

SHA-1 is a cryptographic hash function that converts any input text into a fixed 40-character hexadecimal string (160 bits). Like other hash functions, the same input always produces the same output, and any change to the input changes the hash completely.

SHA-1 was widely used for digital signatures and certificates but is now considered weak against determined attackers and has been phased out in favor of SHA-256 for security-sensitive uses — it still remains common for non-security checksums and version-control systems like Git.

Qui Utilise Cet Outil ?

Pour les Entreprises

Generate a checksum to verify data integrity in a non-security context.

Pour un Usage Personnel

Check whether two pieces of text are exactly identical.

Pour les Étudiants

Learn how the SHA family of hash functions works for a security course.

Pour les Bureaux

Generate a quick reference hash for a text value or document version.

Pourquoi Utiliser Cet Outil

Fonctionnalités Clés

Web Crypto API

Uses your browser's native, audited SHA-1 implementation.

100% Private

Your text is hashed entirely in your browser — nothing is uploaded.

Uppercase Option

Toggle between lowercase and uppercase hex output.

One-Click Copy

Copy the resulting hash straight to your clipboard.

Le Résultat

Avantages

Fast, Native Hashing

Uses the browser's built-in Web Crypto API for speed and accuracy.

No Software Needed

Generate a hash without a command line or programming language.

Completely Private

Sensitive text is never sent to a server, since hashing happens locally.

Étape par Étape

Comment Utiliser Générateur SHA-1

Type or Paste Text

Add the text you want to hash.

Read the Generated Hash

The SHA-1 hash appears automatically below.

Copy the Hash

Use the Copy button to grab the result.

Spécifications

Détails Techniques

Détail	Valeur
Entrée	Plain text, encoded as UTF-8 before hashing
Traitement	No practical limit — handled entirely by your browser
Sortie	Standard SHA-1 (FIPS 180-4), producing a 160-bit (40 hex character) hash

Vous Pouvez le Vérifier

Confidentialité & Sécurité

Ce qui se passe réellement avec votre fichier lorsque vous utilisez cet outil.

100% Client-Side

This tool runs entirely inside your browser using JavaScript — nothing you type or generate is ever sent anywhere.

No Upload, Ever

There is no file upload and no server processing step — your data never leaves your device.

Works Offline

Once this page has loaded, the tool keeps working even without an internet connection.

Nothing Stored

Nothing you enter is saved on our servers — refreshing the page clears everything.

No Tracking of Your Input

We have no way to see what you type, generate or convert with this tool.

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Astuces

Avoid SHA-1 for New Security Systems

For new security-sensitive work, prefer SHA-256 or SHA-512 instead.

Use It to Match Git Commit Hashes

Git historically uses SHA-1 for commit identifiers, which this tool can help you understand.

Questions Fréquentes