GB1 Converter

Extract text from GB1 files

Select File
Drop or upload your .GB1 file

Online File Converter

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How to extract text from your GB1 file

Click the "Select File" button above, and choose your GB1 file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.

Convert GB1 to another file type

To convert your GB1 file to another format, you need GameMaker or other Backup software.

GB1 to BAK
GB1 to BACKUP
GB1 to OLD
GB1 to TMP
GB1 to TEMP
GB1 to ARC
GB1 to ZIP
GB1 to TAR
GB1 to GZ
GB1 to 7Z
GB1 to RAR
GB1 to ISO

Convert a file to GB1

To convert other file formats to the "Legacy Game Project" file type, you need software like GameMaker or a similar tool.

SNAPSHOT to GB1
OLD to GB1
IMG to GB1
RESTORE to GB1
ISO to GB1
COPY to GB1
VMDK to GB1
TMP to GB1
VHD to GB1
BAK to GB1
ARCHIVE to GB1
BACKUP to GB1

About GB1 files

A .gb1 file is an automatic backup of a game project created by legacy versions of GameMaker (specifically versions 7, 8, and 8.1).

Users typically encounter this file after a crash or corruption of their main project file (GMK or GM81). The practical constraint is that Windows and modern GameMaker Studio versions often do not recognize the .gb1 extension directly as a valid project to open. It is essentially a "safety copy" that is locked away behind an obscure extension. To use it, you generally need to rename the extension back to its original format or import it into a legacy editor. Friction points include the inability to double-click to open, version mismatches (e.g., trying to open a legacy backup in GameMaker Studio 2), and the confusion of having multiple backups (GB2, GB3, etc.) without knowing which is the most recent.

Best Target Formats:

For Editing (Restoration): Convert (rename) to GM81 or GMK to open in the original software.
For Modern Development: Import into GameMaker Studio to upgrade the project to a .YYP or GMX format (note: this may require manual code fixes).
For Archiving: Compress into ZIP alongside the assets to preserve the project history.

Convert.Guru analyzes your GB1 file, detects the exact format, and lets you read the text inside.

Users also converted GMR, GM6 and GM1 files.

The GB1 Converter Story

The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our GB1 converter.