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GeoJSON to ESRI Shapefile GeoJSON to GeoPackage GeoJSON to PMTiles
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CSV to GeoJSON CSV to GeoPackage CSV to GPX
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GPX to GeoJSON GPX to GeoPackage GPX to KML
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GeoPackage to GeoJSON GeoPackage to ESRI Shapefile GeoPackage to File Geodatabase
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FlatGeobuf to GeoJSON FlatGeobuf to GeoPackage FlatGeobuf to ESRI Shapefile
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JSON-FG to GeoJSON JSON-FG to GeoPackage JSON-FG to ESRI Shapefile
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KML to GeoJSON KML to GeoPackage KML to ESRI Shapefile
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Mapbox Vector Tiles to GeoJSON Mapbox Vector Tiles to GeoPackage Mapbox Vector Tiles to ESRI Shapefile
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PMTiles to GeoJSON PMTiles to GeoPackage PMTiles to ESRI Shapefile
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MBTiles to GeoJSON MBTiles to GeoPackage MBTiles to ESRI Shapefile
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AutoCAD DXF to GeoJSON AutoCAD DXF to GeoPackage AutoCAD DXF to ESRI Shapefile
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GML to GeoJSON GML to GeoPackage GML to ESRI Shapefile
Microsoft Excel
Microsoft Excel to GeoJSON Microsoft Excel to GeoPackage Microsoft Excel to CSV
GeoRSS
GeoRSS to GeoJSON GeoRSS to GPX GeoRSS to KML
MapInfo
MapInfo to GeoJSON MapInfo to GeoPackage MapInfo to ESRI Shapefile
File Geodatabase
File Geodatabase to GeoJSON File Geodatabase to GeoPackage File Geodatabase to ESRI Shapefile
SpatiaLite / SQLite
SpatiaLite / SQLite to GeoJSON SpatiaLite / SQLite to GeoPackage SpatiaLite / SQLite to ESRI Shapefile
FlatGeobuf to GeoJSON

FlatGeobuf to GeoJSON Converter Online | GeoDataViewer

Quick answer: Convert FlatGeobuf to GeoJSON online for free. Open your FlatGeobuf data, inspect the map preview, and download GeoJSON output locally in your browser — no upload required. FlatGeobuf is a compact binary vector format built for efficient reading, streaming, and distribution of large static geospatial datasets.

Before converting FlatGeobuf to GeoJSON

Prepare the input

Choose a complete FlatGeobuf dataset (.fgb). Keep required sidecar files together and check the source coordinate reference system.

Know what you download

GeoJSON output is a feature collection with geometry and readable attributes. Inspect the actual output coordinates before using it as a web-map layer.

Limits and troubleshooting
  • Converting FlatGeobuf to GeoJSON can change field types, metadata and presentation. A successful download does not prove every source element survived.
  • Confirm WGS 84 longitude/latitude placement in the downloaded output. Missing source CRS cannot be inferred safely; use a desktop GIS to assign or reproject an unknown CRS.
  • Browser memory varies by device. There is no guaranteed unlimited file size; split large datasets or use a desktop GIS when memory or WASM initialization fails.

If something goes wrong

  • Empty or partial preview: confirm the source contains supported vector geometry and compare the source layers with the preview.
  • Wrong continent or distorted geometry: inspect the source CRS, axis order and a known location. Valid syntax alone does not guarantee valid placement.
  • Conversion cannot start: reload while online so processing libraries and WebAssembly can load, then retry a smaller known-good sample. File contents are still processed locally.
  • Incomplete export: compare source/output counts, geometry families and key fields. Inspect warnings and keep the original file.
Source Format Guide

What is FlatGeobuf?

FlatGeobuf is a compact binary vector format built for efficient reading, streaming, and distribution of large static geospatial datasets.

FlatGeobuf focuses on performance. It uses a binary layout that is lighter to parse than text-heavy formats and is well suited to delivering large feature collections without the overhead of a database server.

The format is especially attractive for publish-once, read-many workflows where the main goal is quick transfer and efficient client-side access rather than rich transactional editing.

Common Workflows

Common use cases

  • Download products for large basemap or thematic reference layers.
  • High-volume data publishing where users need a file instead of an API.
  • Intermediate exchange artifacts in automated pipelines that value speed and compactness.
Ecosystem

Where you will encounter it

  • High-performance file downloads.
  • Modern open-source GIS and geospatial ETL tooling.
  • Static dataset distribution where speed matters.
Strengths

Why teams choose FlatGeobuf

  • Binary encoding is more compact and faster to parse than many text formats.
  • Single-file delivery is easy to move and archive.
  • Good fit for large static datasets that do not need a full database container.
Limitations

Where FlatGeobuf gets awkward

  • It is less familiar to many business users than GeoJSON, CSV, or shapefile.
  • Text inspection is not as convenient because the format is binary.
  • Some downstream tools still require legacy or standards-driven export formats.
Conversion steps

How to convert FlatGeobuf to GeoJSON online

  1. 1. Add your FlatGeobuf file

    Drop the source data into the converter above. Keep any required sidecar files together when your dataset uses them.

  2. 2. Check the map preview

    Inspect the geometry and attributes before exporting so you can spot missing layers or coordinate-system issues.

  3. 3. Download GeoJSON

    Run the conversion and save the generated GeoJSON output directly from your browser. Your source file stays on your device.

File Structure

Common file extensions and sidecar files

.fgb
Main FlatGeobuf binary file containing the features and associated spatial index information.
embedded spatial index
FlatGeobuf can carry indexing information inside the file instead of relying on separate sidecars.
Conversion Rationale

Why convert FlatGeobuf to GeoJSON?

Teams commonly convert FlatGeobuf into GeoJSON when they need a web-friendly format that is easy to inspect and debug.

  • Teams convert FlatGeobuf when the destination user needs a more familiar format such as GeoJSON, shapefile, or GeoPackage.
  • It is also converted when the next step is tiled publication, database ingestion, or standards-driven XML delivery.
  • GeoJSON is readable as plain text and widely supported in web mapping libraries and APIs.
  • It is a practical handoff format when you need to validate geometry and attributes quickly.
FAQ

Frequently asked questions about FlatGeobuf to GeoJSON

What do I need before converting FlatGeobuf to GeoJSON?

Choose a complete FlatGeobuf dataset (.fgb). Keep required sidecar files together and check the source coordinate reference system.

What exactly is in the GeoJSON download?

GeoJSON output is a feature collection with geometry and readable attributes. Inspect the actual output coordinates before using it as a web-map layer.

How large a FlatGeobuf file can I convert?

The practical limit depends on browser memory, geometry complexity and the conversion driver. Start with a small sample. There is no guaranteed unlimited size and no cloud fallback or payment tier for large files.

Are my FlatGeobuf files sent to a server?

File parsing and conversion run on your device. The page, WebAssembly and map basemaps can make network requests; choosing a file does not upload its contents. Load the required libraries before attempting offline work.

Can I use the output in Leaflet, MapLibre or Mapbox?

These libraries can read GeoJSON geometry and properties. Check that the actual output uses WGS 84 longitude, latitude and that required attributes survived. Add your web-map styling separately; KML styling is not a portable GeoJSON style specification.

Related Converters

More FlatGeobuf conversion paths

FlatGeobuf to GeoPackage
Open, preview, and convert FlatGeobuf data locally in your browser.
FlatGeobuf to ESRI Shapefile
Open, preview, and convert FlatGeobuf data locally in your browser.
GeoJSON & Shapefile Tools

More tools for working with your data

GeoJSON Viewer →
Open and inspect GeoJSON files on an interactive map with full attribute table support.
Shapefile Viewer →
Open SHP, DBF, SHX files directly in your browser with no upload.
GeoJSON Validator →
Validate GeoJSON for RFC 7946 compliance before publishing or sharing.

Format workflow cluster

More FlatGeobuf and GeoJSON workflows

Use the related viewer, tools, guides, and conversion paths to continue the same GIS task without losing the source format context.