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
Lms2 4c4d535f4139382d34313a31 1 1 mindre
2017 about 1 hour ago 6 control points
1733 30212024941 a5af03de4b o
2017 about 1 hour ago 20 control points
1805 2
2018 about 1 hour ago 15 control points
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Recent Mosaics

Mosaic Title Year Last Updated Number of Maps Percentage Complete
Vilas co 2018 map 1of2 Vilas Co, WI Snowmobile Trails Composite
Composite (mosaic) of Vilas County Snowmobile Trails maps (2 maps combined into one) Compiled by Douglas. Download KML
2 days ago 2 maps 100%
(2 maps)
Nypl.digitalcollections.98a49cec 6d01 d51c e040 e00a1806620d.001.g Bronx 1914 Mid
Publisher: Sanborn Map Company Date Issued: 1914 Atlas 52.1. Vol. 14, 1914. Bronx Atlas 52.1. Vol. 14, 1914. Compiled by AlanL. Download KML
1914 2 days ago 114 maps 100%
(114 maps)
Nypl.digitalcollections.9ac25672 06b0 3ba0 e040 e00a1806439f.001.g 1914-Bronx-NW
Bronx Sanborn Map Company Date I Compiled by AlanL. Download KML
1914 3 days ago 96 maps 100%
(96 maps)
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