CONVERT FITS → SVG (FITS to SVG)
Fast, secure FITS to SVG conversion. No registration required.
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Automatic format identification and lossless transcoding across 201+ formats.
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- ✓ sRGB Color Fidelity
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EXIF & Color Verification Audit ISO
- ✓ GPS Coordinates: Stripped (Zero Location Leak)
- ✓ Device Serial & Lens ID: Stripped (EXIF / IPTC / XMP Clean)
- ✓ Color Space Profile: Display P3 → sRGB IEC61966-2.1
- ✓ Chroma Subsampling: 4:4:4 High Fidelity
HOW TO CONVERT FITS → SVG
Provide the FITS
Click or drag to upload. We accept a single FITS file per job, with an optional queue of additional images for batch mode.
Encode to SVG
The conversion decodes the FITS, resolves the colour space to sRGB and writes the SVG container around the pixel data.
Save the SVG
The download is streamed back over HTTPS. If you uploaded multiple files, a ZIP with all SVG outputs is produced instead.
Setup: FITS is a raster image format with its own balance of compression, colour depth, and software support. Goal: an interchangeable SVG. A FITS → SVG operation is one of the simplest image jobs there is: same pixel grid, different wrapper. What genuinely changes is how lossy the codec is, whether alpha survives, and how large the final file ends up. KaijuConverter picks safe defaults for each of those and lets you override them under Advanced. Background. FITS is a raster image format with its own balance of compression, colour depth, and software support. Destination side, SVG is an XML-based vector format that scales to any resolution without pixel loss.
Why convert FITS to SVG
The real reason to move from FITS to SVG is almost never picture quality — both raster formats store essentially the same pixels. It is about the tools downstream: which editors open the file natively, which CMSes upload it without transcoding, which social platforms accept it. Picking SVG solves those edge cases at the cost of a short conversion step.
FITS vs SVG — Technical specifications
Side-by-side comparison of the technical details.
FITS
- MIME type
- image/fits
- Extensions
- .fits, .fit, .fts
- Standard
- IAU-endorsed FITS 4.0 (latest revision)
- Header records
- 80-character ASCII cards
- Encoding
- IEEE big-endian integers and floats
- MIME Type
- image/fits
- Extension
- .fits
- Category
- Raster & Vector Images
- Full Name
- FITS Astronomical Image
- Conversion Engine
- IMAGEMAGICK
SVG
- MIME type
- image/svg+xml
- MIME Type
- image/svg+xml
- Extension
- .svg
- Category
- Raster & Vector Images
- Full Name
- SVG Vector Image
- Conversion Engine
- IMAGEMAGICK
- Format
- XML (text-based)
- Current version
- SVG 2 (W3C Recommendation, 2018)
- Compression
- Gzipped variant is .svgz
- Resolution
- Unlimited (vector)
- Animation
- SMIL, CSS, JavaScript
| Specification | FITS | SVG |
|---|---|---|
| MIME type | image/fits | image/svg+xml |
| Extensions | .fits, .fit, .fts | — |
| Standard | IAU-endorsed FITS 4.0 (latest revision) | — |
| Header records | 80-character ASCII cards | — |
| Encoding | IEEE big-endian integers and floats | — |
| MIME Type | image/fits | image/svg+xml |
| Extension | .fits | .svg |
| Category | Raster & Vector Images | Raster & Vector Images |
| Full Name | FITS Astronomical Image | SVG Vector Image |
| Conversion Engine | IMAGEMAGICK | IMAGEMAGICK |
| Format | — | XML (text-based) |
| Current version | — | SVG 2 (W3C Recommendation, 2018) |
| Compression | — | Gzipped variant is .svgz |
| Resolution | — | Unlimited (vector) |
| Animation | — | SMIL, CSS, JavaScript |
FITS vs SVG — Strengths and limitations
What each format does best, and where it falls short.
FITS Strengths
- Self-documenting — every file carries complete observational metadata.
- Lossless — bit-exact storage of detector readouts.
- Stable since 1981 with zero breaking changes.
- Mandatory for professional astronomy — every research publication uses it.
- Open standard endorsed by IAU.
Limitations
- Niche — used almost exclusively in astronomy.
- File sizes are large (no default compression).
- Not a display format outside specialized viewers (DS9, AstroBin).
SVG Strengths
- Resolution-independent — crisp at any size, from 16px icon to 4K billboard.
- Tiny file sizes for flat graphics, logos, and UI illustrations.
- Editable with any text editor; programmatically manipulable via DOM.
- Supports interactivity, CSS styling, and JavaScript inside the image.
- Accessible — text inside SVG is readable by screen readers.
Limitations
- Not suitable for photographs or complex raster imagery.
- Uploading user-provided SVG is risky — embedded scripts are an XSS vector.
- Complex SVGs with thousands of paths render more slowly than a PNG equivalent.
Quality & Compatibility
FITS-to-SVG conversion does not change the visible content. Quality is capped by the FITS decode; re-encoding a lossy source at high quality cannot recover detail that was already discarded. For archival masters, keep the original FITS alongside the SVG copy.
Tips for Best Results
- Large FITS files may look identical to small SVG files for photographic content; pick quality based on end use, not headline megapixels.
- For print, export SVG at 300 DPI minimum and check that the colour profile embedded matches the print shop specification.
- Batch-convert related FITS images in one pass so they share identical encoder settings and look consistent side-by-side.
Frequently Asked Questions
It depends on the codecs involved. If both FITS and SVG are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If SVG is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded FITS exactly, but cannot recover detail that FITS had already compressed away.
Often yes, especially when SVG is lossless. FITS tuned for efficient web delivery will usually produce smaller files than SVG's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
FITS Astronomical Image
Source formatFITS (Flexible Image Transport System) is the standard digital file format in astronomy for storing images, tables, and metadata from telescopes and satellites. It supports multi-dimensional arrays and extensive header metadata for scientific observation records.
SVG Vector Image
Target formatSVG is an XML-based vector image format that scales to any resolution without quality loss. It is the standard for web icons, logos, and illustrations that need to look sharp on all screen sizes.
Common Use Cases
Share across platforms
Send SVG files to anyone without worrying about whether they have the right software for FITS.
Embed in documents
Drop SVG output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
SVG often produces smaller files than FITS for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
FITS vs SVG — Typical file sizes
Approximate file sizes for common scenarios.
- Backyard-telescope CCD shot (5 MP) 10-30 MB
- Hubble WFC3 single exposure ~65 MB
- JWST NIRCam full detector ~650 MB
- Simple icon 200 B – 2 KB
- Company logo 2–10 KB
- Complex illustration 20–100 KB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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