Convert FITS to PNG — with auto-stretch, in your browser
Convert FITS (Flexible Image Transport System) files from your telescope, camera, or stacking software to a shareable PNG. Auto-stretch is applied by default — the same 0.5% / 99.5% percentile clip that SIRIL, PixInsight STF, and Astro Pixel Processor use as their initial view. Bright stars stay bright, faint nebulae become visible, and the output is a normal PNG that Instagram, forums, and email will accept. Handles BITPIX 8/16/32/float, big-endian, BZERO/BSCALE scaling. Everything happens in your browser — your data is never uploaded, which matters when you're working with someone else's data or unpublished results.
How it works
- Drop a
.fitsfile (or any image) onto the page. - The PNG output preset is already selected — hit Convert Now.
- Download the result. The whole conversion ran in your browser via WebCodecs or FFmpeg.wasm. No file left your device.
Why convert FITS to PNG?
Convert FITS (Flexible Image Transport System) files from your telescope, camera, or stacking software to a shareable PNG. Auto-stretch is applied by default — the same 0.5% / 99.5% percentile clip that SIRIL, PixInsight STF, and Astro Pixel Processor use as their initial view. Bright stars stay bright, faint nebulae become visible, and the output is a normal PNG that Instagram, forums, and email will accept. Handles BITPIX 8/16/32/float, big-endian, BZERO/BSCALE scaling. Everything happens in your browser — your data is never uploaded, which matters when you're working with someone else's data or unpublished results.
Is my file uploaded anywhere?
No. poqpoq is a static site — the page you're looking at is a bunch of JavaScript your browser downloaded once. It runs entirely on your device. There is no upload endpoint. When you open your browser's Network tab during a conversion, you'll see zero requests going out.