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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?

phuclv
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576i
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  • 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 Aug 29 '13 at 10:07
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    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 Sep 15 '14 at 04:14
  • recommendations should be on https://softwarerecs.stackexchange.com/ – phuclv Aug 01 '18 at 16:54

2 Answers2

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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
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  • 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 Aug 29 '13 at 07:38
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I prefer tiny hexer. I also use HexEdit because it has a 64-bit version

phuclv
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