Map Warper

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Find maps and other imagery, upload, and rectify against a real map.

You can then download and use the rectified map in your mapping applications.

Just sign up and you can start uploading and get warping!

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What is it?

It's a free to use, open source map warper / map georectifier, and image georeferencer tool for individuals and small groups. Developed, hosted and maintained by Tim Waters. If you like this project, please consider donating to keep the project going.

Mail me at for more information!


New shortcuts and add layer features in has been updated with several months of the latest code. Some of these features are directed towards the rectify map interface with the addition of keyboard shortcuts and the... read more

What’s coming to – new stuff! is getting an upgrade of code early this first week in April. New things: Keyboard shortcuts New JSON-API and docs Map caching for faster maps Bigger map windows Upgraded... read more

Mapwarper Tutorial & Spatial Humanities Workshop by Lincoln Mullen
Lincoln Mullen has written a great series of workshops on the Spatial / Digital Humanities over five days. Day 3 is focused around Georectification with and is a very... read more

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Last Rectified Maps

Map Title Year Last Updated Status
Nla.obj 233341192 156
Street map of Canberra, showing places of interest. Relief shown by spot heights. National Library of Australia's copy 3 has index of places of interest trimmed off and adhered to verso.
1959 about 2 hours ago Unrectified
Nla.obj 231730450 134
Base map overprinted with electoral divisions. Cover title: Electoral map of Melbourne &​ suburbs. Also available online http:/​/​​nla.obj-231730450
1856 about 3 hours ago 30 control points
2017 about 4 hours ago 51 control points
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Recent Mosaics

Mosaic Title Year Last Updated Number of Maps Percentage Complete
08912 1885 0002a Sanborn Burlington 1885
Compiled by Bill Morris. Download KML
1885 2 days ago 23 maps 74%
(17 maps)
Pinckney map Waterloo-Pinckney Rec Area
Compiled by K S. Download KML
3 days ago 3 maps 67%
(2 maps)
Private Milwaukee Polonia, 1888, 1927, present
Compiled by Ann. Download KML
5 days ago 2 maps 100%
(2 maps)
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