Zoom: 14
Budapest Overview
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Budapest Offline Map

High-quality street map for offline use

What this app does:

This is a fully offline archival map of Budapest (as of August 8, 2025) that works without internet once loaded.

  • Browse the detailed street map offline
  • Zoom levels 12-16 for the entire city
  • Find your location with GPS
  • Navigate to points of interest including the Embassy of Utopia (green flag)
  • Data stored locally in your browser
⚠️ Download Size: ~150 MB will be downloaded and stored locally. Ensure you have a stable connection and sufficient storage.
Loading map tiles...
Checking local storage...

Downloading map tiles

Tiles current as at 8 August 2025 Expected SHA-1: e78a8063225f88bec6d00995e1e9b8b7d34c0a37
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Estimated size~141 MB

✓ Download Complete

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Initializing map...
version: v5-2025.09.12

Acknowledgments

Map Data & Imagery

OpenStreetMap Contributors © OpenStreetMap contributors

The base map tiles are provided by OpenStreetMap, a collaborative project to create a free editable map of the world. Map data is available under the Open Database License (ODbL).

https://www.openstreetmap.org/copyright

Core Technologies

Python PIL/Pillow - Image processing and tile generation

  • Fredrik Lundh and Contributors (Python Imaging Library)
  • Alex Clark and Contributors (Pillow fork)

IndexedDB API - Browser-based storage for offline functionality

  • W3C Web Applications Working Group specification

Development Tools & Libraries

  • HTML5 Canvas API - Minimap visualization
  • Web Workers API - Background processing capabilities
  • FileReader API - Local file handling
  • Geolocation API - User location services

Data Processing

CSV data format and embassy/consulate location data - Provided by project owner

Coordinate transformation algorithms - Based on Web Mercator projection (EPSG:3857) and standard tile mapping mathematics

Technical References

Slippy map tilenames - OpenStreetMap Wiki contributors

Tile coordinate and zoom level calculations based on OSM tile naming conventions

Web Mercator Projection - Mathematical formulas for lat/lon to pixel conversions

Development Assistance

Claude (Anthropic) - AI assistance with code generation, debugging, and system architecture

Special Thanks

  • The OpenStreetMap volunteer mapping community for maintaining free and open map data
  • The open source community for the tools and libraries that made this project possible
  • Budapest's municipal government for maintaining open geographic data
  • Contributors to the Web standards that enable offline-first progressive web applications

License Note

This application generates derivative works from OpenStreetMap data. Any redistribution must maintain appropriate attribution and comply with the ODbL license terms.