MIFF to PFM Converter
Processing entirely on your device — large files may take a moment.
Magick Image File Format and Portable Float Map exist for different jobs: MIFF is ImageMagick's own intermediate format — a lossless raster container that preserves every channel and profile exactly as the engine sees it, used to chain command-line pipelines. Convert PFM to PNG or JPG to get a viewable tone-mapped preview of float data.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How MIFF compares to PFM
| MIFF | PFM | |
|---|---|---|
| Compression | RLE / none | None (raw floats) |
| Transparency | Supported | Not supported |
| Animation | Multi-frame supported | Not supported |
| Metadata | Extensive key-value header | Minimal header only |
| Best for | ImageMagick intermediates | HDR interchange, render passes |
How to convert MIFF to PFM
- 1
Select your files
Drag & drop your MIFF files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to PFM". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted PFM file individually, or grab everything at once as a ZIP archive.
About the MIFF format
MIFF is ImageMagick's own interchange format — a lossless raster container designed to carry exactly what the engine has in memory: every channel, an optional color profile, per-image properties and even multiple frames in one file. Command-line pipelines use it as the glue between successive ImageMagick operations.
Outside ImageMagick tooling almost nothing opens MIFF. Convert MIFF to PNG or JPG to hand pipeline intermediates to people, or into MIFF when feeding an ImageMagick chain that expects the format.
+Strengths
- ✓Lossless with full channel fidelity
- ✓Multi-frame and rich metadata support
- ✓Native to ImageMagick pipelines
!Limitations
- −Large files (little compression)
- −Unsupported outside ImageMagick
About the PFM format
PFM (Portable Float Map) stores pixels as raw 32-bit floating-point values — no palette, no compression tricks, just the numbers. It belongs to the Netpbm family (PBM/PGM/PPM) and is the lingua franca for handing high-dynamic-range data between renderers, tone-mapping experiments and radiance research scripts.
Because the values are floats, a PFM can hold sunlight and candlelight in the same image without clipping. Viewers rarely open it directly: convert to PNG or JPG to get a tone-mapped preview of the same data.
+Strengths
- ✓Full floating-point precision
- ✓Dead-simple text/binary layout
- ✓Widely read by research tooling
!Limitations
- −Enormous files (16 bytes per pixel)
- −Almost no viewer support
Why convert MIFF to PFM?
There is a concrete reason this conversion exists: Large files (little compression) PFM sidesteps that — Full floating-point precision If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this MIFF to PFM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will I lose quality converting MIFF to PFM?
No — PFM is a lossless format, so every pixel of the converted image matches your original MIFF file. You can also adjust the quality/size balance before converting when the target format supports compression.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your MIFF files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.
Can I convert several MIFF files at once?
Yes — drop as many files as you like into the tool and they are converted in one batch. When more than one file comes out, everything is bundled into a ZIP for a single download.