# Decrease file sizes

**URL:** <https://discourse.slicer.org/t/decrease-file-sizes/47224>\
**Category:** Support\
**Created:** [June 3, 2026, 2:52pm UTC](https://discourse.slicer.org/t/decrease-file-sizes/47224 "2026-06-03T14:52:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![FabricioFO](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fabriciofo/32/82005_2.png) [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\
**Post date:** [June 3, 2026, 2:52pm UTC](https://discourse.slicer.org/t/decrease-file-sizes/47224/1 "2026-06-03T14:52:01Z")

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Hello, everyone. I’m trying to upload my ctscans, but the filles are really big, the resolution is too high. I wanna know how do you solve this kind of problem,

How do you reduce file sizes without losing quality?

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [June 3, 2026, 3:58pm UTC](https://discourse.slicer.org/t/decrease-file-sizes/47224/2 "2026-06-03T15:58:03Z")

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Assuming you have microCT scans, read this tutorial: [Tutorials/ImageStacks at main · SlicerMorph/Tutorials · GitHub](https://github.com/SlicerMorph/Tutorials/tree/main/ImageStacks)

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**Author:** ![aiden.zhu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/aiden.zhu/32/67145_2.png) [@aiden.zhu](https://discourse.slicer.org/u/aiden.zhu)\
**Post date:** [June 4, 2026, 12:21am UTC](https://discourse.slicer.org/t/decrease-file-sizes/47224/3 "2026-06-04T00:21:52Z")

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Here are a few strategies you can try to reduce your file size:

- **A. Crop to a specific Region of Interest (ROI):** Focus only on smaller sub-regions. This is the only method that reduces file size without sacrificing high-resolution image quality.

- **B. Convert bit depth (e.g., 16-bit/32-bit to 8-bit):** While lowering the bit depth reduces data size, it will affect image quality to some degree. Success depends heavily on the contrast of your features.

- **C. Downsample the data:** You can bin the data (e.g., 2x2x2 or 3x3x3). This reduces overall quality, but finding the right downsampling factor can drastically shrink file sizes while keeping the quality acceptable.

- **D. Apply lossless compression:** If you simply need a smaller file for storage or transfer, try compressing it into a ZIP file.