What is the PFI file format?
A .pfi file is a raster image file associated with PhotoFiltre Studio, a Windows image editor developed by Antonio Da Cruz. The software is used for image editing and stores work in the .pfi format with support for multiple editable layers - analogous to Photoshop's .psd - so work can be resumed at any time. The .pfi format can be converted into various other bitmap formats including .jpg, .png, .tif, and .bmp using PhotoFiltre Studio or XnView. The format is exclusive to the paid PhotoFiltre Studio edition; the free PhotoFiltre program does not use it.
Security & safety
RISK: LOWA PhotoFiltre Studio PFI is image data with no scripting or macro capability, so opening one is low-risk. The practical caution is availability: PFI is a proprietary format only PhotoFiltre Studio (and XnView) reads, so don't rely on random 'free PFI viewer/converter' websites - many are ad/PUP traps. Use PhotoFiltre Studio or XnView, and keep an exported PNG/TIFF copy for long-term access. Also confirm WHICH .pfi you have: a large file from Panorama Factory or a tiny Paragon backup index needs its own program, not an image editor.
Format details
in a nutshellFULL NAMEPhotoFiltre Studio Imageaka PhotoFiltre Studio image, PhotoFiltre layered image
DEVELOPERAntonio Da Cruz (PhotoFiltre Studio)since Mid-2000s, with PhotoFiltre Studio's layered editing (PhotoFiltre Studio X era)
CATEGORYRaster Image Files
MIME TYPEapplication/octet-stream
TYPENative layered raster image of PhotoFiltre Studio (binary)
This extension is also used by…
- Panorama Factory bitmap image - The Panorama Factory x64 panorama stitcher saves very large bitmaps as .pfi (used because BMP/TIFF can't exceed 2 GB); opens only in Panorama Factory. This is the name recorded in this site's db.
- Paragon backup index - Paragon Backup & Recovery writes a .pfi index file holding metadata about an incremental disk image; it is not an image you view.
Programs that open PFI files
Windows2 apps
PhotoFiltre Studio
Paid File -> Open the .pfi - this is the native editor and the only program that fully opens layered PFI projects. The db-recommended tool (note: the paid Studio edition, not the free PhotoFiltre). 
XnView / XnViewMP
Freemium Open or batch-convert PFI images to PNG/JPG/TIFF/BMP. XnView reads many PhotoFiltre PFI files even without PhotoFiltre installed - the practical free route to get a usable image. Technical details
deep spec| Developer | Antonio Da Cruz (PhotoFiltre Studio) |
| Platform | Windows |
| Encoding | Binary |
| Byte order | Little-endian |
| Container format | Proprietary PhotoFiltre Studio container; not based on OLE2 or ZIP |
| Compression | Lossless vendor-specific compression applied to layer raster data |
| Colour depth | Up to 32-bit RGBA (24-bit colour plus 8-bit alpha channel) |
| Layer support | Multiple editable raster layers, masks, and text/effect layers |
| MIME type | application/octet-stream (unofficial: image/x-pfi) |
| Typical file size | Hundreds of KB to tens of MB, depending on canvas size and layer count |
| Primary purpose | Working/project file - preserves full layer stack for continued editing |
| Export workflow | Flatten and export to .jpg, .png, .tif or .bmp for distribution |
| File signature | No publicly documented magic bytes; proprietary undocumented binary header |
| Third-party support | XnView and XnViewMP can open or convert .pfi files in some builds |
| Released | Mid-2000s, with PhotoFiltre Studio's layered editing (PhotoFiltre Studio X era) |
| Latest version | Tied to PhotoFiltre Studio X (current commercial version) |
| Specification | www.photofiltre-studio.com |
PFI conversions
Possible
.PFI .PSDGUIDE
You can convert PFI to PSD, but layers will not transfer intact - the fastest path is to open the PFI in…
How to convert
.PFI .BMPGUIDE
Yes - open the PFI in PhotoFiltre Studio or XnView, then save as BMP.
How to convert
.PFI .JPGGUIDE
Yes, PFI converts to JPG - the fastest free route is XnView (free for personal use), which opens PhotoFiltre…
How to convert
.PFI .PDFGUIDE
Yes, you can convert PFI to PDF on Windows by opening the file in PhotoFiltre Studio or XnView and printing…
How to convert
.PFI .PNGGUIDE
Yes, PFI can be converted to PNG - the fastest route is XnView (free), which opens PhotoFiltre Studio images…
How to convert
.PFI .TIFGUIDE
Yes, you can convert PFI to TIF - open the file in PhotoFiltre Studio or XnView and export it as TIFF.
How to convert
Community Q&A
asked by usersNo questions yet - be the first to ask about PFI files.
Frequently asked questions
What is a .pfi file?
Most often a PhotoFiltre Studio Image - the native, layered working format of PhotoFiltre Studio, a Windows image editor. It keeps your layers and edits like a Photoshop .psd. The same extension is also used by Panorama Factory (large panorama bitmaps) and Paragon backup index files.
How do I open a .pfi file?
Open it in PhotoFiltre Studio, the program that created it. If you don't have it, XnView/XnViewMP can open or convert many PFI images to PNG/JPG. A .pfi from a backup tool or panorama stitcher needs that specific program instead.
How do I convert a .pfi to JPG or PNG?
Open it in PhotoFiltre Studio or XnView and Save As / Export to JPG, PNG, TIFF or BMP. XnView can also batch-convert many PFI files at once. Exporting flattens the layers into one image.
Can I open a PFI without PhotoFiltre Studio?
Sometimes - XnView/XnViewMP reads many PhotoFiltre PFI files and can convert them to standard formats. Beyond that, there's no general viewer, since PFI is a proprietary format.
Is a PFI the same as a PSD?
They serve the same purpose - a layered working file you can keep editing - but they're different proprietary formats. PFI is PhotoFiltre Studio's; PSD is Photoshop's. They aren't directly interchangeable; export to PNG/TIFF to move between editors.
Why is my .pfi file huge and not opening in an image editor?
It may be a Panorama Factory .pfi (a very large stitched bitmap used because BMP/TIFF can't exceed 2 GB), which only Panorama Factory opens - not the PhotoFiltre image format.
References
1PhotoFiltre Studio - official site (Antonio Da Cruz)www.photofiltre-studio.com
2fileinfo.com - PFI (PhotoFiltre Studio Image)fileinfo.com
