Changing 2 bytes in a 16GB file - Hex editor or other recommandation needed

I'm looking to change 2 bytes in the header of a 16GB file on windows 7.

I'm looking for a freeware solution to do this task once.

I have tried a few hex editors from the superuser hex editor as well as the wikipedia list of hex editors.

Can anyone recommend a hex editor or similar program that allows to change single bytes on very large files?

576i

Posted 2013-08-29T06:47:05.037

Reputation: 363

You can split the file to a small part with the header and the remainder using this sort of tools - http://www.hjsplit.org/, modify the header and then re-merge them using copy/b command. But I believe that there are many tools to hex big files directly so please consider this way if you can't find a better way.

– Scott Rhee – 2014-09-15T04:14:55.913

recommendations should be on https://softwarerecs.stackexchange.com/

– phuclv – 2018-08-01T16:54:33.117

You could probably do this with a few lines of code in written in the Python language (which is free). It probably also true of some of the languages the come with Windows. – martineau – 2013-08-29T10:07:50.500

Answers

Ultraedit allows you to edit huge files directly (without having to load them). It has built-in hex editor.

Be careful or make a copy of file when using direct editing, since there are no backups.

Program is not freeware but for a one time procedure you can use trial version, which you can uninstall later.

T. Kaltnekar

Posted 2013-08-29T06:47:05.037

Reputation: 7 636

Thanks, the solution works. I'll wait for a few days if someone recommends a free tools that does this too, before I mark this solved. – 576i – 2013-08-29T07:38:05.227

I prefer tiny hexer. I also use HexEdit because it has a 64-bit version

phuclv

Posted 2013-08-29T06:47:05.037

Reputation: 14 930