WebP to FITS Converter
Processing entirely on your device — large files may take a moment.
Convert FITS frames to PNG or JPG to preview telescope data, or pack them into a ZIP for sharing. If your files are still in WebP format, this page is the shortcut: WebP is a modern image format from Google. It typically produces files 25–35% smaller than JPG at similar visual quality, supports transparency like PNG, and can even hold animations.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How WebP compares to FITS
| WebP | FITS | |
|---|---|---|
| Compression | Lossy and lossless modes | None (optionally Rice/GZIP) |
| Transparency | Supported (alpha) | Not supported |
| Animation | Supported | Not supported |
| Metadata | EXIF, ICC embeddable | Rich text header (WCS) |
| Best for | Web images and bandwidth savings | Telescope frames, science data |
How to convert WebP to FITS
- 1
Select your files
Drag & drop your WebP 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 FITS". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted FITS file individually, or grab everything at once as a ZIP archive.
About the WebP format
WebP is Google's image format, released in 2010 and built on the VP8 video codec. In lossy mode it typically produces files 25–35% smaller than JPG at the same visual quality, and it also has a true lossless mode that beats PNG. Crucially, one format covers what used to require two: lossy photos with transparency, and even animation, all in a single container.
Browser support is no longer the barrier it once was: Safari added WebP in iOS 14 (2020), and every modern browser now decodes it. The remaining friction is with older desktop software and a hard dimension limit of 16383×16383 pixels, which rules out very large panoramas and print masters.
+Strengths
- ✓25–35% smaller than JPG at equal visual quality
- ✓Transparency and animation built into the same format
- ✓Supported by every current browser and most CDNs
- ✓Has a genuine lossless mode that out-compresses PNG
!Limitations
- −Hard limit of 16383×16383 pixels per image
- −Older photo apps and OS image viewers may not open it
- −Encoding is more CPU-intensive than JPG
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
Why convert WebP to FITS?
There is a concrete reason this conversion exists: Hard limit of 16383×16383 pixels per image FITS sidesteps that — Self-documenting science headers If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this WebP to FITS 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 WebP to FITS?
No — FITS is a lossless format, so every pixel of the converted image matches your original WebP file. You can also adjust the quality/size balance before converting when the target format supports compression.
Can I convert several WebP files at once?
Yes — drop as many files as you like into the tool and they are converted in one batch. When more than one file comes out, everything is bundled into a ZIP for a single download.
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 WebP files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.