PSB to FITS Converter
Processing entirely on your device — large files may take a moment.
Convert FITS frames to PNG or JPG to preview telescope data, or pack them into a ZIP for sharing. 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.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How PSB compares to FITS
| PSB | FITS | |
|---|---|---|
| Compression | Lossless (RLE/ZIP layers) | None (optionally Rice/GZIP) |
| Transparency | Per-layer alpha | Not supported |
| Animation | Timeline exists, exported as frames | Not supported |
| Metadata | XMP, EXIF, guides, paths | Rich text header (WCS) |
| Best for | Design source files | Telescope frames, science data |
How to convert PSB to FITS
- 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 FITS". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted FITS 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 FITS format
FITS (Flexible Image Transport System) has carried professional astronomy data since 1981: every file opens with a plain-text header that records telescope, instrument, exposure, filters and world coordinates, followed by raw pixel arrays — often 16-bit or float, sometimes data cubes.
Values can be negative or far above display range, so FITS never looks right in a photo viewer. Converting to PNG applies a simple scaling pass that reveals the nebula or galaxy in the numbers — good for previews, while science pipelines keep the original.
+Strengths
- ✓Self-documenting science headers
- ✓High bit depth (16/32-bit, float)
- ✓The standard of every observatory
!Limitations
- −Not display-ready
- −Files are large and uncompressed
Why convert PSB to FITS?
Think of it as moving your file to the container that fits the job. Very large files FITS works differently: Self-documenting science headers 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 FITS 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 FITS?
No — FITS 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.
Can I convert several PSB 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.
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.