BFOTKit brings straightforward browser tools together in one place. Rename batches of files with custom numbering or turn ESRI ASCII Grid files into coordinate based CSV tables.
Explore the toolkitGive a large batch of files consistent names with custom sequential numbering and zero-padding. Bring files together from multiple folders, preview and reorder the sequence, then download renamed copies in one ZIP.
Batch convert ESRI ASCII Grid (.asc) files into CSV, preview each raster, and optionally reproject coordinates. Your grid files stay in your browser.
More useful browser tools will be listed here as they’re added.
An ASC file is often an ESRI ASCII Grid: a plain text raster format that stores values across a regular grid. The BFOTKit ASC to CSV converter turns each cell into a record you can inspect in a spreadsheet, import into a database, or use in another data workflow. Open the ASC to CSV converter, choose a grid, review its preview, and download the result.
An ASCII Grid contains a header followed by numeric rows. Its header records dimensions, cell size, lower-left origin, and an optional NoData marker. The converter creates one CSV row per cell, with x and y cell-center coordinates, the raster value, and one-based row and column indexes. These fields connect each value to its position in the original grid.
Cell centers are calculated from the origin and cell size. A corner origin is offset by half a cell; a center origin is used directly. Since grid rows run from top to bottom, y coordinates step downward through the file. By default, coordinates remain in the grid’s native units, such as meters or degrees.
Select or drop an .asc file into the tool. After the grid is read and checked in your browser, inspect the raster and sample CSV rows, then choose Download CSV. One grid produces one CSV. For several grids, select multiple files or a ZIP archive; batch results contain a CSV for each grid in a ZIP download. Add matching .prj files to provide source CRS details.
NoData cells are included by default to preserve every grid cell. Turn off Include NoData cells to omit masked areas. In a batch, switch between grids to check their raster pattern and coordinate extent. The local preview has no street labels or satellite imagery and does not use online map tiles.
To convert ASCII to CSV with mapped coordinates, remember that the ASC header describes grid geometry but not its projection. Default x and y values use the coordinates and units in the file; they are not automatically latitude and longitude. For reprojection, provide the source CRS from a .prj file, EPSG code, or WKT/PROJ definition. Then choose WGS 84 (EPSG:4326), Web Mercator (EPSG:3857), or a custom output CRS.
If an EPSG definition is unavailable in the browser library, the tool retrieves that definition by code from epsg.io. The ASC data stays on your device. Choose the correct source CRS before transforming coordinates; a missing projection cannot be inferred from cell values alone.
Cell-level CSV output can help compare raster values, create a point table, join values to another dataset, or prepare data for software that reads delimited text. Row and column fields preserve grid position if a spreadsheet reformats coordinates. The current limit is 200 MB of combined input and 1,000,000 cells per batch, subject to browser memory.
An ASCII to CSV converter also makes raster data easier to review outside a GIS. Sort or filter records, calculate summaries, and keep the original cell indexes alongside values. CSV is a plain text format supported by many common data applications, so converted records can move between tools without changing the source grid.
Grid contents are processed in your browser and are not uploaded to BFOTKit. Convert one file or batch several ASC grids in one session. Visit the dedicated converter page for its preview, coordinate options, FAQs, and download controls.