100% Secure & Private
FITS Converter
Free browser-based FITS converter with no signup. Your files stay local. reaConverter for Windows adds automation, editing, and 700+ other formats.
How to Convert .fits Images in Bulk
1. Install reaConverter
Download reliable FITS conversion software to convert multiple .fits files and folders in one go.
2. Select FITS Files
Select FITSs from a folder or drag and drop them into reaConverter, then choose the desired output format.
3. Start Conversion
Click Convert to start the bulk conversion of all selected FITS images. The process will begin right away.
Step by step
See It in Action
For quick and effortless FITS file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.
Edit & Enhance
Do more with your images
Converting FITS images for use in a workflow? Touch up, transform, apply editing and effects to your images during conversion.
Our range of editing options includes such image processing actions as Resize, Rotate, Crop, Color Replace, Watermarks and more. Adjust actions include RGB, HLS, HSV, Brightness and Contrast. Auto-processing options are also available, such as auto-rotate and auto-crop.
User reviews
From those who tried it
Average User Rating:Last updated on June 25, 2026
Essential for our astroimaging pipeline! reaConverter perfectly handles FITS files from our research telescope, preserving all WCS coordinates and photometric data during batch conversion to TIFF. Now we process 100+ deep-sky exposures nightly without losing critical metadata for our exoplanet studies!
Joseph Wilson
Satisfied Customer
An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness.
Elena Anderson
Happy User
reaConverter makes FITS conversion incredibly easy. We batch convert astronomical images to standard formats for presentations and analysis, all automated through the command-line. It’s fast, reliable, and handles large datasets without issues.
Laura N.
Astrophysics Research Assistant
Working in a print studio means constantly juggling obscure file formats. I used to waste hours Googling converters or installing random software — until reaConverter became my Swiss Army knife. Install it once, and you're set forever. No internet? No problem!
Helen Evans
Satisfied Customer
reaConverter is pure gold! Rock-solid performance with zero crashes. No internet needed—perfect for travel or low-connectivity work. The ultimate offline alternative to sketchy web converters. Plus, the desktop version keeps sensitive files secure since nothing ever gets uploaded to the cloud.
Malik T. Martin
Satisfied Customer
We use reaConverter in our department to handle image and document conversions for multiple teams. The Watch Folders function is brilliant — I configured different folders for different workflows, and now everything happens automatically in the background. No more manual conversions or missed files. Rock-solid performance!
James L.
IT Manager
Questions & Answers
FITS images: Frequently Asked Questions
What are FITS files?
FITS (Flexible Image Transport System) is a standard file format used in astronomy to store and share scientific data and images. It is designed to be flexible and extensible, allowing for the storage of various types of data and metadata. FITS files typically contain both image data and header information describing the properties of the data, such as its dimensions, pixel size, and exposure time. The format has been widely adopted by astronomers and is supported by many software tools and libraries.
Can reaConverter open FITS files?
reaConverter fully supports the FITS image format – open, edit, and export FITS files to any other popular file format with ease.
reaConverter also lets you:
- control FITS bit depth with the new "Create 16-bit FITS" option in the save settings, enabled by default
How do I change FITS to another format?
reaConverter is a user-friendly tool for converting FITS files. Once installed on your computer, it allows you to convert all your .fits files at once with just a few clicks. You can even convert fits images directly from Windows Explorer using the right-click menu — fast and convenient.
Can I convert FITS online?
If you only want to convert a few FITS images, you are welcome to try our free online FITS converter.
How can I turn FITS files on my computer to another format?
The best way to convert FITS images on your PC is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from FITS.
How can I automate FITS files conversion?
reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.
Can I convert FITS files using scripts or the command-line interface?
reaConverter provides full access to all its features from the Windows command-line shell, including the command-line fits converter.
What else can I do with reaConverter?
Convert DICOM filesCrop photoChange format settingsCopy metadata (EXIF, IPTC)Convert medical images
What formats can I convert a FITS file to?
fits → aifits → apngfits → aviffits → bmpfits → bpgfits → calfits → cg4fits → cgmfits → cinfits → citfits → dcmfits → dcxfits → ddsfits → dgnfits → disfits → drwfits → dwffits → dwgfits → dxffits → emffits → epifits → epsfits → faxfits → fliffits → gbrfits → giffits → glbfits → gltffits → hpgfits → hrufits → icofits → ifffits → igesfits → igsfits → jp2fits → jpegfits → jpgfits → jxlfits → jxrfits → ktx2fits → miffits → mtvfits → pclfits → pctfits → pcxfits → pdffits → pgmfits → picfits → pltfits → pngfits → ppmfits → prcfits → psfits → psdfits → qoifits → qrtfits → radfits → rlafits → sgifits → shpfits → stepfits → stlfits → stpfits → svgfits → svgzfits → tgafits → tiffits → tifffits → u3dfits → webpfits → webpllfits → wmffits → wmzfits → wpgfits → wrlfits → x3dfits → xbmfits → xpm
What types of files can I convert to FITS format?
!c → fits$c → fits$s → fits000 → fits001 → fits2bp → fits2d → fits3 → fits301 → fits3d → fits3ds → fits3fr → fits3mf → fits411 → fits4bt → fits73i → fits82i → fits83i → fits85i → fits86i → fits89i → fits92i → fitsa64 → fitsabc → fitsabic → fitsabs → fitsac → fitsac3d → fitsacc → fitsace → fitsacorn → fitsadt → fitsaff → fitsafp → fitsafx → fitsai → fitsaip → fitsalias → fitsals → fitsami → fitsamj → fitsani → fitsapng → fitsapx → fitsarf → fitsari → fitsarn → fitsart → fitsarw → fitsasc → fitsase → fitsask → fitsatk → fitsavif → fitsavs → fitsawd → fitsb&w → fitsb16 → fitsb3d → fitsb_w → fitsbay → fitsbfl → fitsbfli → fitsbfx → fitsbga → fitsbif → fitsbig → fitsbld → fitsblend → fitsblk → fitsbm → fitsbmf → fitsbmg → fitsbmp → fitsbmq → fitsbmx → fitsbn → fitsbna → fitsbob → fitsbot → fitsbpg → fitsbpr → fitsbre → fitsbrk → fitsbrt → fitsbs → fitsbsg → fitsbtn → fitsbum → fitsbvh → fitsbw → fitsc4 → fitscal → fitscals → fitscam → fitscan → fitscap → fitscar → fitscat → fitscbm → fitscbr → fitscbz → fitscdr → fitscdu → fitsce → fitsce1 → fitsce2 → fitscel → fitscg4 → fitscgm → fitsciff → fitscin → fitscine → fitscip → fitscit → fitsclo → fitsclp → fitscmp → fitscmt → fitscmu → fitscmw → fitscmx → fitscnc → fitscob → fitscp8 → fitscpa → fitscpc → fitscpi → fitscpt → fitscr2 → fitscr3 → fitscrd → fitscrg → fitscrw → fitscs1 → fitscsm → fitsct → fitscut → fitscvp → fitsczi → fitsdae → fitsdat → fitsdbw → fitsdc2 → fitsdc3 → fitsdcm → fitsdcr → fitsdcs → fitsdcx → fitsdd → fitsdds → fitsdgn → fitsdib → fitsdic → fitsdicom → fitsdis → fitsdjv → fitsdjvu → fitsdng → fitsdoc → fitsdocx → fitsdol → fitsdoo → fitsdpx → fitsdrd → fitsdrf → fitsdrl → fitsdrw → fitsdrz → fitsdsi → fitsdst → fitsdta → fitsdwf → fitsdwfx → fitsdwg → fitsdxf → fitse00 → fitsecc → fitsecw → fitsef3 → fitsefx → fitsei → fitseidi → fitseip → fitsemf → fitsemz → fitsenff → fitsepa → fitsepi → fitseps → fitsepub → fitserf → fitsesm → fitsets → fitsexr → fitsf96 → fitsfac → fitsface → fitsfax → fitsfbm → fitsfbx → fitsfcx → fitsfff → fitsfi → fitsfit → fitsflc → fitsfli → fitsflif → fitsfmf → fitsfp2 → fitsfpg → fitsfpp → fitsfpr → fitsfpt → fitsfpx → fitsfre → fitsfrm → fitsfsy → fitsftf → fitsfts → fitsfun → fitsfx3 → fitsfxd → fitsfxm → fitsfxo → fitsfxr → fitsfxs → fitsg → fitsg16 → fitsg3 → fitsg3n → fitsg4 → fitsgaf → fitsgb → fitsgbl → fitsgbo → fitsgbp → fitsgbr → fitsgbs → fitsgbx → fitsgcode → fitsgeb → fitsgeo → fitsgeojson → fitsgeotiff → fitsgg → fitsgif → fitsgig → fitsgih → fitsgko → fitsglb → fitsgltf → fitsgm → fitsgm1 → fitsgm2 → fitsgm4 → fitsgmf → fitsgml → fitsgmt → fitsgp4 → fitsgpb → fitsgpx → fitsgraf → fitsgrb → fitsgro → fitsgro2 → fitsgro4 → fitsgsd → fitsgtiff → fitsgtl → fitsgtm → fitsgto → fitsgtp → fitsgts → fitsgtx → fitsgtz → fitsgun → fitsgxt → fitshdp → fitshdr → fitshdri → fitshdru → fitshed → fitsheic → fitsheif → fitshf → fitshg → fitshgl → fitshir → fitshmb → fitshmp → fitshp → fitshp1 → fitshp2 → fitshpg → fitshpgl → fitshpi → fitshr → fitshru → fitshrz → fitsi17 → fitsi18 → fitsia → fitsib7 → fitsibg → fitsica → fitsicb → fitsicl → fitsicn → fitsicns → fitsico → fitsidc → fitsif9 → fitsifc → fitsifczip → fitsiff → fitsifl → fitsiges → fitsigs → fitsiim → fitsiimg → fitsiiq → fitsim1 → fitsim5 → fitsima → fitsimg → fitsimi → fitsimt → fitsinfo → fitsioca → fitsipg → fitsiph → fitsipt → fitsiris → fitsirr → fitsirrmesh → fitsish → fitsism → fitsiss → fitsitg → fitsj2c → fitsj2k → fitsj6i → fitsjb2 → fitsjb2e → fitsjb2g → fitsjbf → fitsjbg → fitsjbig → fitsjbig2 → fitsjfi → fitsjfif → fitsjif → fitsjiff → fitsjig → fitsjj → fitsjls → fitsjng → fitsjp2 → fitsjp2000 → fitsjp2k → fitsjpc → fitsjpe → fitsjpeg → fitsjpf → fitsjpg → fitsjpg2 → fitsjpm → fitsjpp → fitsjps → fitsjpx → fitsjtf → fitsjxl → fitsjxr → fitsjxs → fitsjxt → fitsk25 → fitskap → fitskc2 → fitskdc → fitskfx → fitskml → fitskmz → fitskoa → fitskps → fitskqp → fitskra → fitsktx2 → fitslbm → fitslda → fitslff → fitslif → fitslvp → fitslwi → fitslwo → fitslws → fitslxo → fitsm3d → fitsm8 → fitsmac → fitsmag → fitsmap → fitsmbfavs → fitsmbfs → fitsmbm → fitsmd2 → fitsmd3 → fitsmd5 → fitsmdc → fitsmdl → fitsmef → fitsmesh → fitsmgr → fitsmh → fitsmic → fitsmif → fitsmiff → fitsmil → fitsmim → fitsmix → fitsmng → fitsmos → fitsmot → fitsmph → fitsmpnt → fitsmpo → fitsmrf → fitsmrw → fitsms3d → fitsmsk → fitsmsp → fitsmtv → fitsnap → fitsnav → fitsnc → fitsnc1 → fitsncd → fitsncr → fitsnct → fitsnd2 → fitsndo → fitsnef → fitsneo → fitsnff → fitsngc → fitsnii → fitsnii.gz → fitsnitf → fitsnlm → fitsnmp → fitsnol → fitsnpl → fitsnpm → fitsnrw → fitsnsr → fitsntf → fitsnva → fitsoaz → fitsobj → fitsobm → fitsocp → fitsoff → fitsofx → fitsogex → fitsoil → fitsorb → fitsorf → fitsoxps → fitsp64 → fitsp7 → fitspac → fitspan → fitspat → fitspax → fitspbm → fitspbt → fitspc → fitspcc → fitspcd → fitspcl → fitspcm → fitspcp → fitspct → fitspcx → fitspd → fitspdb → fitspdd → fitspdf → fitspdn → fitspdp → fitspds → fitspdx → fitspe4 → fitspef → fitspen → fitspfr → fitspg → fitspgc → fitspgf → fitspgm → fitsph → fitsphp → fitspi → fitspic → fitspicio → fitspict → fitspig → fitspix → fitspixar → fitspk3 → fitsplc → fitsplo → fitspls → fitsplt → fitsply → fitspm → fitspmg → fitspmp → fitspmx → fitspng → fitspnm → fitsppm → fitsppp → fitspps → fitsppt → fitsprc → fitsprf → fitspri → fitsprj → fitsprn → fitsprt → fitsps → fitspsa → fitspsb → fitspsd → fitspse → fitspsf → fitspsp → fitspspbrush → fitspspframe → fitspspimage → fitspspmask → fitspst → fitsptk → fitsptoca → fitsptx → fitspwp → fitspxa → fitspxb → fitspxl → fitspxn → fitspxr → fitspxs → fitspzl → fitspzp → fitsq0 → fitsq3d → fitsq3o → fitsq3s → fitsqcc → fitsqdv → fitsqli → fitsqoi → fitsqrt → fitsqti → fitsqtif → fitsqtk → fitsqtl → fitsr3d → fitsrad → fitsraf → fitsras → fitsrast → fitsraw → fitsrdc → fitsrec → fitsrgb → fitsrgh → fitsriff → fitsris → fitsrix → fitsrla → fitsrlb → fitsrlc2 → fitsrle → fitsrp → fitsrpbm → fitsrpm → fitsrpt → fitsrpt → fitsrs → fitsrsb → fitsrtf → fitsrw2 → fitsrwl → fitsrwz → fitssar → fitssc → fitssc2 → fitssci → fitsscn → fitsscr → fitssct → fitsscu → fitsscut → fitsscut2 → fitsscut3 → fitsscut4 → fitsscut5 → fitsscut6 → fitsscx → fitssd0 → fitssd1 → fitssd2 → fitssdg → fitsseq → fitssff → fitssfw → fitssgi → fitsshp → fitsshx → fitssi → fitssib → fitssid → fitssim → fitssir → fitssj1 → fitssk → fitssk1 → fitsskb → fitsskm → fitsskn → fitsskp → fitssmb → fitssmd → fitssmp → fitssmt → fitssna → fitssol → fitsspc → fitsspl → fitsspp → fitssps → fitsspu → fitssr → fitssr2 → fitssrf → fitssrw → fitsssb → fitsssi → fitsssp → fitssst → fitsst4 → fitsst5 → fitsst6 → fitsst7 → fitsst8 → fitsstc → fitsstep → fitssti → fitsstl → fitsstp → fitssts → fitsstw → fitsstx → fitssul → fitssun → fitssuniff → fitssvg → fitssvga → fitssvgz → fitssvs → fitsswf → fitssyj → fitssyn → fitssynu → fitstaac → fitstab → fitstap → fitstdi → fitstdim → fitster → fitstex → fitstg4 → fitstga → fitstif → fitstiff → fitstil → fitstim → fitstjp → fitstm2 → fitstn1 → fitstn2 → fitstn3 → fitstnl → fitstny → fitstop → fitstrp → fitstsk → fitstub → fitstxt → fitsu3d → fitsuc → fitsuni → fitsupi → fitsuyvy → fitsv → fitsv3m → fitsvda → fitsvdx → fitsvff → fitsvfx → fitsvi → fitsvic → fitsvicar → fitsvid → fitsvif → fitsviff → fitsvit → fitsvob → fitsvpb → fitsvsd → fitsvsdm → fitsvsdx → fitsvsi → fitsvst → fitsvta → fitsvtf → fitswal → fitswb0 → fitswb1 → fitswbc → fitswbmp → fitswbp → fitswbz → fitswdp → fitswebp → fitswebpll → fitswfx → fitswmf → fitswmz → fitswpd → fitswpg → fitswrl → fitswzl → fitsx → fitsx11 → fitsx3d → fitsx3f → fitsxar → fitsxbm → fitsxcf → fitsxfig → fitsxgl → fitsxif → fitsxim → fitsxisf → fitsxln → fitsxpm → fitsxps → fitsxv → fitsxwd → fitsyuv → fitszae → fitszbr → fitszgl → fits
Discover More
Beyond FITS conversion
Convert .fits files in batches of any size, with editing and processing applied along the way. The same tool also handles 700+ other formats, including CAD, medical imaging, and GIS.
