Hash Generator
SHA-1 to SHA-256: Can You Convert a SHA-1 Hash?
Learn whether a SHA-1 hash can be converted directly to SHA-256, why the two hashes are different, and how to generate a SHA-256 hash from the original data.
Can You Convert SHA-1 Directly to SHA-256?
You cannot directly convert an existing SHA-1 hash into the corresponding SHA-256 hash.
SHA-1 and SHA-256 are different hashing algorithms. A SHA-256 hash must be calculated from the original input data rather than mathematically converting the SHA-1 output into a SHA-256 output.
Why SHA-1 and SHA-256 Are Different
SHA-1 and SHA-256 produce different hash values because they use different algorithms and produce different output lengths.
A SHA-1 digest is 160 bits long, while a SHA-256 digest is 256 bits long. The two values therefore cannot simply be translated from one format into the other.
How to Get a SHA-256 Hash From the Same Data
If you have the original file, text, or other input used to create a SHA-1 hash, you can calculate a SHA-256 hash from that original input.
The process is to provide the original data to a SHA-256 hashing tool and generate a new digest using the SHA-256 algorithm.
What If You Only Have the SHA-1 Hash?
If you only have the SHA-1 hash and no access to the original input, you cannot use the SHA-1 value itself to calculate the corresponding SHA-256 hash.
The SHA-1 hash can be compared or verified against known data, but it does not contain the original input in a form that can simply be converted into a SHA-256 digest.
SHA-1 to SHA-256 Example
Suppose a file was originally hashed with SHA-1. To obtain its SHA-256 hash, you would use the original file as the input for SHA-256.
You would not enter the SHA-1 digest as the input and expect it to produce the SHA-256 digest of the original file. Those are different hashing operations.
How to Generate SHA-256 Online
If you have the original text or file data, you can use the Martools Hash Generator to generate a SHA-256 hash.
Select SHA-256, provide the original input supported by the tool, and generate the new digest. If you are verifying a file, compare the resulting SHA-256 value with the expected checksum.
SHA-1 vs SHA-256
SHA-1 and SHA-256 should not be treated as interchangeable hash formats. SHA-1 produces a 160-bit digest, while SHA-256 produces a 256-bit digest.
For a broader comparison of the two algorithms, see SHA-1 vs SHA-256.
Final Thoughts
A SHA-1 hash cannot simply be converted into the corresponding SHA-256 hash. To obtain a SHA-256 digest, you need to calculate SHA-256 using the original input data.
If you have the original file or text, a hash generator can calculate the SHA-256 value directly.
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Read guide →Frequently asked questions
Can you convert SHA-1 to SHA-256?
You cannot directly convert an existing SHA-1 hash into the corresponding SHA-256 hash. You need the original input data and must calculate a new SHA-256 hash.
Is there a SHA-1 to SHA-256 converter?
A tool can calculate SHA-256 from the original input, but it cannot derive the original SHA-256 hash simply by converting an existing SHA-1 digest.
Can I generate SHA-256 from a SHA-1 hash?
Not the SHA-256 hash of the original data. You need the original data to calculate its SHA-256 digest.
What is the difference between SHA-1 and SHA-256?
SHA-1 and SHA-256 are different hashing algorithms. SHA-1 produces a 160-bit digest, while SHA-256 produces a 256-bit digest.
How do I get a SHA-256 hash from a file?
Use the original file as the input to a SHA-256 hashing tool and generate a new SHA-256 digest.
Can a SHA-1 hash be reversed to get the original data?
A cryptographic hash is designed as a one-way function, so a SHA-1 digest does not provide a straightforward way to recover the original input.