Free online IMS to OME.TIFF converter

Microscopy software and image-analysis platforms may require OME-TIFF instead of the native IMS container for interoperability, archiving, or downstream processing in Fiji and other OME-compatible tools. Converting preserves the image planes and supported metadata while making the dataset easier to exchange.

What the IMS format is

IMS is the native multidimensional microscopy dataset format used by Imaris from Bitplane, now part of Oxford Instruments. It is generally an HDF5-based container for image planes, channels, Z-stacks, time points, multiple resolution levels, and selected acquisition metadata.

IMS files are created by Imaris and may be produced by microscopy acquisition or analysis workflows involving confocal, light-sheet, fluorescence, and other 3D imaging systems. An IMS file can also contain Imaris-specific objects such as surfaces, spots, tracks, and scene or rendering information.

What the OME.TIFF format is

OME-TIFF is a TIFF-based microscopy format whose OME-XML metadata describes dimensions such as channel, Z, time, pixel size, and physical units. Fiji/ImageJ, Bio-Formats, napari, OMERO, and many scientific image-analysis applications can read it.

OME-TIFF is useful when a dataset must move between microscopy programs without depending on Imaris. It supports multidimensional data, lossless compression such as LZW, tiled storage, and BigTIFF for files larger than the classic TIFF size limit.

How to convert IMS to OME.TIFF

Using Bio-Formats from the command line

1. Install the Bio-Formats command-line tools, or use the Bio-Formats installation bundled with Fiji.
2. Run bfconvert -compression LZW input.ims output.ome.tiff. LZW keeps pixel values unchanged while reducing file size.
3. For a very large dataset, use BigTIFF and tiling: bfconvert -bigtiff -tilex 512 -tiley 512 -compression LZW input.ims output.ome.tiff.
4. If the IMS contains several image series, inspect the available series first and export the required one with a series option such as bfconvert -series 0 input.ims output.ome.tiff. Export additional series separately when a single output file would not represent them correctly.

Using Fiji

1. Open Fiji and choose File → Open, then select the IMS file. Bio-Formats should open it through the Bio-Formats Importer.
2. Check the series, channel, Z, and time-point settings in the importer. Avoid selecting a single plane if the complete stack is required.
3. Use Plugins → Bio-Formats → Bio-Formats Exporter, choose OME-TIFF, select LZW or another lossless option, and save the result with an .ome.tiff filename.
4. Reopen the output with Bio-Formats and verify its dimensions, channel order, pixel type, and physical scale.

Using the online converter

You can convert the file for free on 101convert.com without installing software. Uploading is unsuitable for confidential or regulated microscopy data unless the applicable privacy and retention requirements permit it; for large datasets, Bio-Formats is usually more practical.

Quality, compatibility, and limitations

Bio-Formats transfers image pixels and metadata that have OME-TIFF equivalents, but it does not reproduce Imaris scene layouts, volume-rendering settings, surfaces, spots, tracks, annotations, or other analysis objects as native OME-TIFF features. Preserve the original IMS file when those objects may be needed later.

Use LZW or uncompressed output for quantitative imaging. JPEG compression can alter intensity values and is unsuitable for measurements. Large time-lapse or high-resolution 3D datasets may require BigTIFF, and some applications cannot read BigTIFF or every multidimensional OME-TIFF layout.

Check the converted file for channel names, channel order, Z-spacing, time interval, pixel dimensions, bit depth, and physical units. Proprietary or damaged IMS variants may fail in older Bio-Formats releases; updating Bio-Formats or Fiji can resolve reader compatibility problems.