PGM's uncompressed storage means even simple grayscale research output takes up far more space than necessary, while AVIF's AV1-based compression produces some of the smallest file sizes available for a given visual quality. Converting research or pipeline output from PGM to AVIF can shrink file sizes dramatically, which matters most once you're dealing with a large batch of grayscale files generated by an automated process.
AVIF's more advanced compression takes longer to encode than simpler formats, but multi-core batch processing keeps this manageable even for large PGM collections.
- Install Batchify Image Converter and Resizer Pro on your Windows PC.
- Open the app and select Batch Mode for multiple files, or Individual Mode for a single PGM.
- Drag your PGM file or folder into the app window, enabling recursive folder scanning if needed.
- Set the "From" format to PGM and the "To" format to AVIF.
- Adjust the quality setting to balance file size against visual detail.
- Click Convert. AVIF files are written to your output folder, fully offline.
- 100% offline — your research and pipeline output is never uploaded anywhere
- Dramatic file size reduction compared to uncompressed PGM
- Bulk conversion of entire folders, including sub-folders, in one pass
- Multi-core processing helps offset AVIF's heavier encoding cost
- Option to delete original PGM files automatically once converted
- No recurring subscription or hidden upload limits
How much smaller will my files be after converting to AVIF?
Often dramatically smaller, since PGM stores data completely uncompressed while AVIF uses some of the most efficient compression available, even for grayscale content.
Will my grayscale image gain color in AVIF?
No, the original PGM file only ever contained grayscale luminance values, so the converted AVIF stays grayscale even though the format itself supports full color.
Can I convert an entire folder of PGM files to AVIF at once?
Yes, Batch Mode handles entire folders, including nested sub-folders, and scales conversion speed across multiple CPU cores.
Ready to convert your images offline, in bulk, with full privacy?