FITS to SVG Converter
Processing entirely on your device — large files may take a moment.
FITS (Flexible Image Transport System) is the data format of professional astronomy — every image carries a human-readable header with telescope, exposure and world coordinates alongside the raw pixel data. Because only browsers and design tools handle SVG natively, exporting it to PNG or JPG makes the artwork usable in Office documents, photo editors and ordinary apps.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How FITS compares to SVG
| FITS | SVG | |
|---|---|---|
| Compression | None (optionally Rice/GZIP) | Lossless (gzip-able text) |
| Transparency | Not supported | Native (it is just geometry) |
| Animation | Not supported | SMIL, CSS, JS |
| Metadata | Rich text header (WCS) | Arbitrary XML metadata |
| Best for | Telescope frames, science data | Icons, logos, charts, illustration |
How to convert FITS to SVG
- 1
Select your files
Drag & drop your FITS files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to SVG". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted SVG file individually, or grab everything at once as a ZIP archive.
About the FITS format
FITS (Flexible Image Transport System) has carried professional astronomy data since 1981: every file opens with a plain-text header that records telescope, instrument, exposure, filters and world coordinates, followed by raw pixel arrays — often 16-bit or float, sometimes data cubes.
Values can be negative or far above display range, so FITS never looks right in a photo viewer. Converting to PNG applies a simple scaling pass that reveals the nebula or galaxy in the numbers — good for previews, while science pipelines keep the original.
+Strengths
- ✓Self-documenting science headers
- ✓High bit depth (16/32-bit, float)
- ✓The standard of every observatory
!Limitations
- −Not display-ready
- −Files are large and uncompressed
About the SVG format
SVG (Scalable Vector Graphics) is the W3C's XML-based vector format. Instead of pixels, it stores shapes — paths, circles, polygons, text — as math, which means an SVG logo is a few kilobytes and stays perfectly sharp from a 16-pixel favicon to a billboard. Browsers render it natively, CSS can restyle it, and it scales with zero quality decisions to make.
It is the wrong tool for photographs — vectorizing a photo produces enormous, slow files. It is also worth remembering that SVG is executable XML: files from untrusted sources can carry scripts, so sites typically sanitize uploads. For icons, logos, charts and flat illustration, nothing else comes close.
+Strengths
- ✓Infinitely scalable with zero quality loss
- ✓Tiny files for icons and geometric art
- ✓Styleable and animatable with CSS and JavaScript
- ✓Text stays selectable and searchable
!Limitations
- −Unsuitable for photographs — files explode in size
- −Complex hand-drawn illustrations can grow heavy too
- −Untrusted SVG can embed scripts and needs sanitizing
Why convert FITS to SVG?
Converting makes sense where the strengths of SVG meet what FITS cannot give you. Infinitely scalable with zero quality loss Meanwhile Not display-ready One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this FITS to SVG converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will I lose quality converting FITS to SVG?
No — SVG is a lossless format, so every pixel of the converted image matches your original FITS file. You can also adjust the quality/size balance before converting when the target format supports compression.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your FITS files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.
Will transparent areas survive the conversion to SVG?
Transparency is kept whenever SVG actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.