How to use
1. Enter or paste the text you want to generate a hash for in the input box above.
2. Click the Generate button to create the hash result.
Options
1. Process each line separately: When enabled, each line of input is processed separately, and each line produces its own hash. When disabled, the entire input is processed as one single text value.
2. Ignore blank lines: When enabled, blank lines are skipped and no results are generated for them. This option is usually most useful when processing text line by line.
3. Uppercase result: When enabled, the generated hash is displayed in uppercase letters, for example A-F instead of a-f. The original input text is not changed.
Example
Enter the following content:
123456
Click the generate button to produce:
7c4a8d09ca3762af61e59520943dc26494f8941b
About This SHA-1 Hash Generator
StarryTool's SHA-1 hash generator creates a SHA-1 digest from the text you enter. It is useful for generating a quick 40-character SHA1 hash from a string, code snippet, ID, sample value, or other non-sensitive text.
SHA-1 stands for Secure Hash Algorithm 1. It produces a 160-bit hash value, commonly shown as a 40-character hexadecimal string. The same input produces the same SHA-1 output, while a small change in the input should produce a different hash.
This tool is for text input. If you need to hash an uploaded file, use a file checksum tool instead.
• Common Uses
Generate a SHA-1 hash from a string, sentence, code snippet, ID, or sample text.
Create predictable SHA-1 values for development, testing, logs, examples, database checks, or documentation.
Compare non-sensitive text values when both sides are expected to use SHA-1.
Work with older APIs, databases, tools, or systems that still require SHA-1 formatted digests.
Process multiple lines separately when you need an individual SHA-1 result for each line of input.
• Features
Text to SHA-1: Paste or type text and generate its SHA-1 digest online.
Fixed-Length Output: SHA-1 returns a 160-bit digest, usually displayed as a 40-character hexadecimal value.
Consistent Results: The same text input generates the same SHA-1 hash, which helps with repeatable checks.
Line-by-Line Processing: Generate separate SHA-1 hashes for multiple lines of text when needed.
• SHA-1 Security Notes
SHA-1 is still useful for legacy compatibility, basic checks, and non-sensitive development tasks, but it is no longer considered secure for modern cryptographic protection.
Do not use SHA-1 for password storage, digital signatures, certificates, or security-sensitive integrity checks. For passwords, use a dedicated password hashing method such as Argon2id, bcrypt, scrypt, or PBKDF2 with a unique salt and an appropriate work factor.
For stronger general-purpose hashing, use SHA-256, SHA-512, or SHA-3 unless your system specifically requires SHA-1.