Considering that .blend1 files are just backup files of .blend files, it doesn't seem that this is a case of file conversion, but more of a file backup done in Blender. You do not need to convert anything, just rename the suffix back to .blender and that's it.
Home > Search converters: blend to blend1
Conversion of blend file format to blend1 file format beta
Search for blend to blend1 converter or software able to handle these file types.
Convert Blender 3D data file to Blender backup.
We have found 3 software records in our database eligible for .blend to .blend1 file format conversion.
Microsoft Windows software 
- convert blend to blend1 on Windows
Blender
A very popular free program used for work with 3D graphics
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from blend file | No | Yes | Yes | blend editor | No | No | No | No |
to blend1 file | No | Yes | Yes | blend1 editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned blend to blend1. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software 
- convert blend to blend1 on OS X
Blender for Mac
The Mac version of popular free 3D graphics software
Linux/Unix software 
- convert blend to blend1 on Linux
Blender for Linux
Easy-to-use 3D modeling utility
Additional links: Open blend file, Open blend1 file
BLEND
Files with blend extension are the default 3D graphic files created and saved in popular Blender, a 3D computer graphics software for Windows, macOS and Linux.
BLEND1
A blend1 file extension is related to the Blender, a 3D modeling tool for various platforms. A blend1 file stores backup of data.
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