PSB to MIFF Converter
Processing entirely on your device — large files may take a moment.
Convert images to MIFF when a downstream ImageMagick pipeline expects it, or MIFF to PNG/JPG for viewing. If your files are still in PSB format, this page is the shortcut: PSB ("Photoshop Big") is PSD's large-format sibling — the same layered structure, sized for documents beyond 30,000 pixels that plain PSD cannot hold.
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 PSB compares to MIFF
| PSB | MIFF | |
|---|---|---|
| Compression | Lossless (RLE/ZIP layers) | RLE / none |
| Transparency | Per-layer alpha | Supported |
| Animation | Timeline exists, exported as frames | Multi-frame supported |
| Metadata | XMP, EXIF, guides, paths | Extensive key-value header |
| Best for | Design source files | ImageMagick intermediates |
How to convert PSB to MIFF
- 1
Select your files
Drag & drop your PSB 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 MIFF". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MIFF file individually, or grab everything at once as a ZIP archive.
About the PSB format
PSD is Adobe Photoshop's native document format and the source-of-truth file of the design industry. It keeps everything editable: layers with masks, adjustment layers, smart objects, layer effects and live text. The format is big-endian and only partially documented, but its ubiquity means libraries in every language can read the common parts.
Two practical gotchas define PSD life outside Photoshop. First, files are enormous — hundreds of megabytes is normal for layered work. Second, the flattened composite other apps display is only embedded when the file was saved with “Maximize Compatibility” enabled; without it, converters that read the composite will fail. Sharing to non-designers means exporting a JPG, PNG or PDF copy.
+Strengths
- ✓Fully editable: layers, masks, effects and live text
- ✓The universal design source format
- ✓Smart objects allow non-destructive scaling and filters
!Limitations
- −Very large files
- −Full fidelity requires Photoshop or Creative Cloud apps
- −Composite preview may be missing without Maximize Compatibility
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
Why convert PSB to MIFF?
Think of it as moving your file to the container that fits the job. Very large files MIFF works differently: Lossless with full channel fidelity If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this PSB to MIFF 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 PSB to MIFF?
No — MIFF is a lossless format, so every pixel of the converted image matches your original PSB 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 PSB files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.
Will transparent areas survive the conversion to MIFF?
Transparency is kept whenever MIFF actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.