PPM (Portable Pixmap), part of the Netpbm family created in the late 1980s, stores full color images at 24 bits per pixel in a simple structure that's easy for command-line tools and research software to read directly. HEIC's modern HEVC-based compression isn't something most Netpbm-based pipelines or academic image-processing tools are built to decode, so converting an iPhone photo to PPM first makes it usable in those environments.
This conversion is typically needed when feeding photos into a Unix-style processing pipeline, computer vision research tool, or any software built around the Netpbm toolset specifically, rather than for everyday photo sharing or storage.
- 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 HEIC file.
- Drag your HEIC file or folder into the app window, enabling recursive folder scanning if needed.
- Set the "From" format to HEIC and the "To" format to PPM.
- Click Convert. PPM files are written to the output folder, fully offline.
- 100% offline — your photos are never sent to any server
- Bulk conversion of entire iPhone photo libraries in one pass
- Produces standard PPM files compatible with Netpbm-based tools and pipelines
- Multi-core processing for fast handling of large batches
- Option to delete original HEIC files automatically once converted
- No recurring subscription or hidden upload limits
Why would research software need PPM instead of HEIC?
Most Netpbm-based pipelines and academic research tools are built to read PPM's simple structure directly rather than decode HEIC's HEVC-based compression, making conversion necessary for compatibility.
Will my PPM file be larger than the original HEIC?
Yes, typically significantly so, since PPM doesn't apply the kind of efficient compression HEIC uses, resulting in considerably larger file sizes for the same image.
Can I convert a whole folder of HEIC files to PPM at once?
Yes, Batch Mode handles entire folders, including nested sub-folders, in a single conversion run.
Ready to convert your images offline, in bulk, with full privacy?