Convert scientific FITS astronomical image data (.fits, .fit, .fts) from NASA, ESA, Hubble, James Webb Space Telescope (JWST), and astrophotography rigs into viewable lossless PNGs in your browser. 100% private with zero server uploads.
Detailed side-by-side format architecture for FITS Graphic Raster (.fits) and Portable Network Graphics (.png). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .fits file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .png directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert FITS to PNG locally
magick input.fits output.pngWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
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FITS (Flexible Image Transport System) is the standard astronomical digital file format endorsed by the IAU (International Astronomical Union) and NASA. It stores high-dynamic-range scientific telescope data, CCD captures, and celestial coordinates alongside 2880-byte metadata header blocks.
Raw telescope sensors capture linear photon counts with huge dynamic ranges (often 16-bit or 32-bit floating point), where faint nebulae and galaxies would appear pitch black without processing. convrtr applies smart percentile contrast auto-stretching and astronomical coordinate orientation to reveal deep-sky details in standard 8-bit per channel PNGs.
convrtr supports all standard BITPIX formats: 8-bit unsigned integers, 16-bit and 32-bit signed big-endian integers (with BZERO and BSCALE physical value transformation), 64-bit integers, and single-precision (-32) and double-precision (-64) IEEE 754 floating point arrays, as well as 3D RGB datacubes.
Never. All 2880-byte card parsing, pixel scaling, auto-stretch normalization, and PNG compression happen strictly inside your browser memory.
FITS Graphic Raster (FITS) and Portable Network Graphics (PNG) serve distinct roles across the digital workflow. Converting to PNG provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (PNG) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .fits files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
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