MD5 Hash Changer Online – Change a File Checksum

Create a copy with a different MD5 checksum

A file hash is calculated from the underlying bytes. This tool preserves your original and makes a separate copy by appending one ASCII space byte (0x20). The table displays MD5, but SHA-1, SHA-256, and other hashes calculated over the whole file will also change.

The changed copy is one byte larger. Many common viewers tolerate trailing data, but the result is not appropriate for signed executables, authenticated packages, or formats that require an exact ending. Keep the original until you have tested the downloaded copy in its intended application.

How to change a file's MD5 hash

Select or drop one or more files and review the names shown in the results table.

Click Change MD5 Hash to calculate the original checksum and prepare a changed copy.

Compare the two MD5 values, then download each changed file you want to keep.

MD5 hash changer FAQ

How does changing a file's MD5 work?

The tool appends one ASCII space byte (0x20) to a new copy. Because the binary contents differ, MD5 and other whole-file hashes such as SHA-1 and SHA-256 will also change in normal use. The original file is never overwritten.

Can I choose the new MD5 value?

No. It creates a different checksum, but MD5 values cannot be chosen freely. Producing a file for a specific target MD5 is not what this tool does.

Will the changed file still open normally?

Many media and document readers ignore a harmless trailing byte, but compatibility is not guaranteed for every format. Signed files, strict containers, installers, and integrity-checked packages can become invalid or fail verification.

Does changing MD5 remove metadata or make a file anonymous?

No. A different MD5 does not remove metadata, hide identity, bypass a platform's recognition systems, or make a file anonymous. Other hashes and file-content analysis can still relate two files.

Are files uploaded while the MD5 is changed?

The selected files are read and copied in your browser without being uploaded by this tool. The generated copy is saved only when you click Download.

Is MD5 secure for cryptographic verification?

MD5 is suitable for quick checksum comparisons but is no longer considered collision-resistant for security. Use a modern hash such as SHA-256 when verifying security-sensitive downloads or signed artifacts.