Convert JPEG to ASCII Grid online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from JPG to ASC format
All processing is done locally in your browser
Output standard ASC format
Convert jpg to asc online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
JPEG is a widely used lossy image format that achieves high compression via DCT. In GIS, JPEG is often used to store and transfer true-color satellite imagery and orthophotos, and can carry georeferencing via .jgw world files.
ASCII Grid (also AAIGrid) is a plain-text raster format by ESRI. The file header contains geographic metadata (cols, rows, origin, cell size, NoData), and the body stores each cell value as a space-separated numeric matrix. Highly readable, often used for teaching and small-scale data exchange.
Converting JPEG to ASCII Grid is one of the most common workflows in GIS. JPEG data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while ASCII Grid is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your JPEG files, keeps geometry and attributes intact, and writes clean ASCII Grid output — entirely in your browser, so your data never leaves your device.
No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.
Yes, completely free with no sign-up and no usage limits.
By default the output keeps the source coordinate system. If your JPEG file uses a projected CRS (like UTM), you can search any EPSG coordinate system by keyword or code and reproject in one step. Note: output formats that require WGS84 by specification (KML, KMZ, GPX) always reproject to WGS84 automatically.
Yes — drop several JPEG files at once and each one produces its own ASCII Grid output.
Upload your JPEG file — drag and drop it onto the page, or browse from your device. You can add several files at once for batch conversion.
The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.
Download the ASCII Grid file. Each input produces its own output, ready to use in your GIS, web map, or archive.