SHA-1 Hash

Compute a SHA-1 hash of text in hex or Base64 for legacy APIs, checksum verification, and compatibility.

For this tool, processing runs locally in your browser and data is not sent to the server.

SHA-1 Hash is a free online tool that computes a SHA-1 hash from any text. Output is available in hex or Base64 and can be compared against an expected value. The tool is useful for legacy APIs, old integrations, test data, and compatibility checks where SHA-1 is still required. The tool runs in your browser and does not send data to the server. Note: SHA-1 is deprecated and must not be used for new security scenarios.

What it does

Output

Processing

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How to use

Paste a string, text, legacy API payload, or test value into the input field.
Choose an output format: Hex or Base64.
Get the SHA-1 hash and optionally compare it against an expected value.
Copy the result for legacy APIs, tests, logs, checksums, or compatibility with older software.

More about this tool

SHA-1 Hash computes a SHA-1 hash from a string or text. The tool is useful for legacy APIs, old integrations, test data, logs, and verifying compatibility with older software where SHA-1 is still required. The result can be output as Hex or Base64 and compared against an expected SHA-1 value.

SHA-1 is deprecated and must not be used for new security scenarios, passwords, tokens, digital signatures, or data protection. For new projects, SHA-256 is the recommended choice.

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Computes SHA-1 from text
Supports Hex and Base64 output
Can compare against an expected SHA-1
Useful for legacy APIs and compatibility
Shows input size and output format
No registration required

Frequently Asked Questions

What is SHA-1?

SHA-1 is a deprecated cryptographic hash function that transforms input data into a fixed-length hash. For new tasks, SHA-256 is generally used instead.

Can SHA-1 be used for new projects?

SHA-1 is not recommended for new security scenarios. It may only be needed for compatibility with older APIs and legacy systems where the algorithm is already specified.

Can SHA-1 be used for passwords?

No. SHA-1 must not be used for storing passwords. Use purpose-built algorithms with salt and work factors such as Argon2, bcrypt, or scrypt.

How is SHA-1 different from SHA-256?

SHA-256 is modern and more resistant to attacks. SHA-1 is retained mainly for compatibility with older systems where the algorithm is already fixed.

Can I verify whether a SHA-1 hash matches?

Yes. Enable hash comparison, paste an expected value, and the tool will show whether it matches the computed hash.

Can SHA-1 be reversed?

No. SHA-1 is a hash function, not encryption. The original text cannot be directly recovered from the hash.

How is SHA-1 different from HMAC-SHA1?

SHA-1 computes a plain hash from data. HMAC-SHA1 uses a secret key and appears in some older signing schemes. These are separate use cases.

Can I compute the SHA-1 hash of a file?

This tool is designed for text. For files, a separate file checksum tool where you can select a file and compute its hash locally is more appropriate.

Is my data sent to the server?

No. Text is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.

More about this tool

SHA-1 is deprecated and must not be used for new security scenarios, passwords, tokens, digital signatures, or data protection. For new projects, SHA-256 is the recommended choice.

All processing is done locally in the browser. Your data is not sent to the server.

Runs in the browser
Data is not sent to the server
Computes SHA-1 from text
Supports Hex and Base64 output
Can compare against an expected SHA-1
Useful for legacy APIs and compatibility
Shows input size and output format
No registration required

Frequently Asked Questions

What is SHA-1?

SHA-1 is a deprecated cryptographic hash function that transforms input data into a fixed-length hash. For new tasks, SHA-256 is generally used instead.

Can SHA-1 be used for new projects?

SHA-1 is not recommended for new security scenarios. It may only be needed for compatibility with older APIs and legacy systems where the algorithm is already specified.

Can SHA-1 be used for passwords?

No. SHA-1 must not be used for storing passwords. Use purpose-built algorithms with salt and work factors such as Argon2, bcrypt, or scrypt.

How is SHA-1 different from SHA-256?

SHA-256 is modern and more resistant to attacks. SHA-1 is retained mainly for compatibility with older systems where the algorithm is already fixed.

Can I verify whether a SHA-1 hash matches?

Yes. Enable hash comparison, paste an expected value, and the tool will show whether it matches the computed hash.

Can SHA-1 be reversed?

No. SHA-1 is a hash function, not encryption. The original text cannot be directly recovered from the hash.

How is SHA-1 different from HMAC-SHA1?

SHA-1 computes a plain hash from data. HMAC-SHA1 uses a secret key and appears in some older signing schemes. These are separate use cases.

Can I compute the SHA-1 hash of a file?

This tool is designed for text. For files, a separate file checksum tool where you can select a file and compute its hash locally is more appropriate.

Is my data sent to the server?

No. Text is processed locally in the browser and is not sent to the server.

Do I need to register?

No. The tool works immediately without registration.