Convert GRO files online for free
The converter easily converts your GRO file to various formats - free and online. No Photoshop or extra software needed.
The converter also works in reverse, so you can convert other Game formats to GRO with high quality output.
A .gro file is most frequently a Serious Engine Game Archive developed by Croteam for titles like the Serious Sam series and The Talos Principle. These files function as compressed containers that bundle essential game assets - such as textures, 3D models, audio scripts, and level data - into a single package to streamline loading.
The primary friction for users is that .gro files are opaque to standard operating systems; you cannot simply double-click to view the textures or play the music inside. Gamers often encounter them when attempting to mod the game, extract the soundtrack, or translate in-game text. A secondary, legacy use case is the HP Graphic Object format, used by older Hewlett-Packard 48/49 series calculators, which are incompatible with modern image viewers.
For the Serious Engine format, the most pragmatic "conversion" is often a simple workaround: because these files typically use standard compression, you can rename the extension from .gro to zip to open them with 7-Zip or WinRAR. Once opened, you can extract content to standard formats: convert textures to PNG or TGA for editing in Adobe Photoshop, and audio to WAV or MP3. For the legacy HP format, use XnView to view and convert the bitmaps to JPG or TIFF for archiving.
Use Convert.Guru to open and convert your GRO file.
Users also converted PDB, ASPX, DAT, PDF, DS2RES, RPACK and YLD files.
If you want to convert GRO file to WEBP or CUR, you can use Serious Sam 4 or similar software from the "Game Asset Archive" category. In the File menu, look for Save As… or Export….
To convert SVG files to GRO, try Serious Sam 4 or another comparable tool in the "Game Asset Archive" category.
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 GRO converter.