When saving a file using the "File -> Save As" menu entry, you can either select a particular file format in Save Options, or you can choose "Save by Extension". This simply means that Gimp will save the file using whatever format relates to the extension that has been given to the filename - for example, typing foo.jpg would save the file as a JPEG.

The extensions supported by the Gimp are:

.aa - An AA file;
.avi - An AVI file;
.bmp - A Bitmap file;
.c - A C source file;
.cel - A CEL file;
.colorhtml - A formatted HTML file;
.dataurl - Used data URLs;
.fit - A FITS file;
.fli - An FLI file;
.gbr - A Gimp brush;
.gicon - A Gicon file;
.gif - A GIF file;
.gih - A GIH file;
.gpb - A GPB file;
.h - A C header file;
.hrz - An HRZ file;
.html - An HTML table;
.jpg - A JPEG file;
.miff - A MIFF file;
.pat - A Gimp pattern;
.pcx - A PCX file;
.pix - A PIX file;
.png - A PNG file;
.pnm - A PNM file;
.ps - A PostScript file;
.rgb - An SGI file;
.im1 - A Sunras file;
.tga - A TGA file;
.tif - A TIFF file;
.xbm - An XBM file;
.xcf - An XCF file (Gimp's Native);
.xwd - An XWD file;
.xpm - An XPM file;
.xcf.bz2 - A bzip2 compressed XCF file.

For more information on these formats, click on the file extension.

Although this is list of formats supported as standard by the Gimp, other formats may be supported by adding additional plug-ins. These can be obtained at The Gimp Plug-in Registry.

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