Map Tile Download and Visualizer

My web app for bulk-downloading Open Street Map tiles for offline use and visualizing what you've downloaded.

Download a whole town, country, even continent of OSM tiles.

Visualize what's been downloaded, add more at any time super easily. Perfect for

Meshcore ESP32 Firmware projects
- Wadamesh firmware project is my personal favorite so far
- MCLite is perfect for simple deployments
- SigurdOS-tdeck is promising
- Trail Mate is map-focused and is trying to work with MC and Mt, both
- Saitama is up and coming
Meshtastic UI firmware
My OpenTx mapping widget, AlphaMaps
Any firmware using my NavBoxLib library
- Like my NavBoxESP firmware for M5 Cardputer and Lilygo T-Deck

Check out those projects, give my downloader a try!

How big is it, downloading tons of tiles?

As of 2026-06-28 there were 73,650 tiles, totaling 1.2GB.
Now as of 2026-07-09 there are 238,487 tiles, making the cache 4.0GB total

Seeing as most SD-Cards are 16 or 32 GB– might as well download it all. Use the cache-only mode to quickly download enormous areas.

If you download just your local area it can be 1-100 MB.

There are no limits on cache-only tile downloading.
New, missing tiles of high zoom levels are limited:
- The limits are shown as a percentage progress bar.
- They're per-user, per-tile-region, and globally tile server API restriction limited. All reduced to a nice simple percentage bar for you.
- New tiles come from different OSM providers to lessen the load and stay within API restrictions.
So if you start getting errors then zoom out a little, download a base map, and try again later.
Try the new "Cache-only Fetching" option!
The app is Chrome / Edge only. I use other browsers too, but they've got the ability to sync to a folder which is essential.

All coded from scratch, for fun, and self-hosted with off-grid solar power. See my about page
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