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SHA1 Hash Generator

Generate SHA-1 hashes from text or files online. Verify checksums with hash comparison.

Compare Hash (Verify Integrity)

SHA-1 Hash Generator

Generate SHA-1 message digests from text or files instantly. SHA-1 produces a 160-bit (40 hex character) hash commonly used for checksums and data integrity verification.

SHA-1 is deprecated for security use. Consider SHA-256 for cryptographic purposes.
160-bit Hash

Why Use This Tool?

Instant Hashing

Generate SHA-1 hashes in milliseconds using native Web Crypto API.

File Support

Hash files of any size directly in your browser without uploading.

Hash Comparison

Verify file integrity by comparing hashes with visual feedback.

100% Private

All processing happens locally. Your data never leaves your device.

How this SHA1 Hash Generator works

This cryptographic tool generates SHA-1 (Secure Hash Algorithm 1) digests producing 160-bit (40 hexadecimal character) hash values from text or file input. SHA-1 applies multiple rounds of compression functions, bitwise operations, and modular addition to create deterministic fingerprints useful for checksums and data integrity verification.

Text mode hashes typed or pasted content instantly using the Web Crypto API's native SHA-1 implementation. File mode processes uploads of any size entirely within your browser, supporting large files through ArrayBuffer reading. Hash comparison accepts expected checksums, verifying matches with visual feedback indicating integrity pass or corruption warning.

Output displays lowercase or uppercase hexadecimal per user preference. History tracks recent hashes for reference. Security notice warns against SHA-1 for cryptographic purposes due to demonstrated collision attacks—use SHA-256 for security-critical applications.

How to Use

1

Enter Text or Upload File

Type/paste text or upload a file to hash.

2

Generate Hash

Click generate to create the SHA-1 digest.

3

Copy or Compare

Copy the hash or verify against an existing one.

Example Usage

Generating SHA-1 hash:

Input
Hello World
Output
0a4d55a8d778e5022fab701977c5d840bbc486d0

Frequently Asked Questions

What is SHA-1?
SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (40-character hex) hash value. It was designed by the NSA and published in 1995.
Is SHA-1 secure?
SHA-1 is no longer considered secure for cryptographic purposes as collision attacks have been demonstrated. For security-critical applications, use SHA-256 or SHA-3 instead.
What is SHA-1 used for?
SHA-1 is still used for non-security purposes like checksums, Git commits, data deduplication, and legacy system compatibility.
Is my data safe?
Yes, all hashing is performed locally in your browser using the Web Crypto API. Your data never leaves your device.

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SHA256 Hash Generator

Generate SHA-256 cryptographic hashes for text. Used for checksums and security.

MD5 Hash Generator

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The SHA1 Hash Generator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.