In QGIS 2.8 there is a clear button to 'enable on the fly CRS transformation' in the "project properties" for a new project. Seen here: enter image description here

But in QGIS 3.0, I cannot find it to save my life.

enter image description here

Can anyone help?

  • It is on by default issues.qgis.org/issues/11644
    – user30184
    Commented May 7, 2018 at 19:10
  • I couldn't comment on the comment from gisnside but I found it to be very useful +1 if I could. Also I agree with AnsreasK, being able to turn off OTF would be very help to quickly identify layers with different projections as I do this often.
    – Scott
    Commented Mar 2, 2019 at 0:53
  • It would be great if someone could update the documentation and tutorials for 3.x that still refer to enabling OTF transformations. docs.qgis.org/3.4/en/docs/user_manual/working_with_projections/… Commented Mar 23, 2019 at 11:58
  • 1
    I have used on the fly reprojections for a few years with QGIS and it always worked very well until the NOOSA release. Now when I bring in raster files they don't reproject to the county coordinate systems that I have used for years. They used to in older versions of QGIS. It doesn't seem to matter if I bring in the rasters from and ESRI server or a local server. Has any one else had this problem or found a solution other than installing an older version of QGIS? Commented May 2, 2019 at 16:44
  • 1
    This does not really answer the question. If you have a different question, you can ask it by clicking Ask Question. You can also add a bounty to draw more attention to this question once you have enough reputation. - From Review
    – whyzar
    Commented May 2, 2019 at 19:07

1 Answer 1


In QGIS 3.0, on-the-fly (OTF) reprojection is always enabled (https://issues.qgis.org/issues/11644).

  • 3
    There is no option anymore to deactivate the the OTF? This is crazy! For a GIS program this is ridiculous.
    – AndreasK
    Commented Nov 19, 2018 at 13:41
  • @AndreasK Can you list any cases when OTF reprojection should NOT be used? Commented Nov 26, 2018 at 0:57
  • 17
    Every time when there is the possibility that your layers are in a different coordinate system! With the OTF ON&OFF you could immediately see that you have layers with different coordinate systems in your project. As I gave courses to hundreds of people, I know that people look for super-easy ways. That said QGIS3 is in many many way more complicated (more clicks) than QGIS2. The new checkbox (instead of OTF!!!) --> "No Projection" is almost unexplainable and doesn't make sense in 99.999% of all cases.
    – AndreasK
    Commented Nov 26, 2018 at 18:31
  • 1
    Deactivating this option is good to see the source coordinates : I support the fact it's very useful. @AndreasK the workaround is just to select "no projection" for your project ;)
    – gisnside
    Commented Feb 27, 2019 at 14:00

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