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Updated August 31, 2016.
An image converter is a kind of file converter that converts one image file format (like a JPG, BMP, TIF, etc.) into another. If you're unable to use a photo, graphic, or any kind of image file the way you'd like because the format isn't supported, image converter software can help.
Important: Every image converter program listed below is freeware. I have not included trialware or shareware image converters.
Here's a list of the best completely free image converter software programs and online services:
XnConvert is the Swiss Army knife of image converters. With XnView, you can convert any of around 500 image formats to your choice of around 80 others. If you have a rare image format that you can't open, XnView can probably convert it.
XnView also supports batch conversion, folder imports, filters, resizing, and several other advanced options.
Input Formats: BMP, EMF, GIF, ICO, JPG, PCX, PDF, PNG, PSD, RAW, TIF, and many more
Output Formats: BMP, EMF, GIF, ICO, JPG, PCX, PDF, PNG, PSD, RAW, TIF, and many more
You can see the complete list of supported formats here: XnConvert Formats.
Download XnConvert for Free
The publisher of XnConvert also has a free command line based, dedicated image converter called NConvert but XnConvert is much easier to use.
XnConvert should work with Windows 10 down through Windows 2000, as well as with Mac and Linux operating systems. There's even a portable option for Windows on the download page, available for both 32-bit and 64-bit versions. More »
2. CoolUtils Online Image Converter
The CoolUtils Online Image Converter is just that - an image converter that exists completely online, no download required.
Unlike other online image converters, the CoolUtils service does the image converting for you in real time - no waiting on an email link.
Input Formats: BMP, GIF, ICO, JPEG, PNG, and TIFF
Output Formats: BMP, GIF, ICO, JPEG, PNG, and TIFF
I'm assuming there's a file size limit on the original file you upload but I couldn't confirm one. I uploaded and converted a 17MB TIFF file to a JPEG without problem.
CoolUtils Free Online Image Converter
One thing I like about CoolUtils is that it lets you rotate and resize an image before you convert it.
Since CoolUtils works through a web browser, you can use it with nearly any operating system, like with Windows, Linux, and Mac. More »
FileZigZag is another online image converter service that will convert most common graphics formats.
Just upload the original image, choose the desired output, and then wait for an email with a link to your image in the new format.
Input Formats: GIF, BMP, JPG, PAM, PBM, PCX, PGM, PNG, PPM, SGI, YUV, TGA, TIF, and TIFF
Output Formats: BMP, DPX, GIF, JPG, PAM, PBM, PNG, PCX, PGM, PPM, RAS, SGI, TGA, TIF, TIFF, and YUV
FileZigZag Review and Link
Just like any online file converter, you have to unfortunately wait for FileZigZag to upload the file and then wait again for the download link. But since most images are of a small size, it really shouldn't take that long altogether. More »
Zamzar is yet another online image converter service that supports most common photo and graphic formats and even a few CAD formats.
Input Formats: 3FR, AI, ARW, BMP, CR2, CRW, CDR, DCR, DNG, DWG, DXF, EMF, ERF, GIF, JPG, MDI, MEF, MRW, NEF, ODG, ORF, PCX, PEF, PNG, PPM, PSD, RAF, RAW, SR2, SVG, TGA, TIFF, WBMP, WMF, X3F, and XCF
Output Formats: AI, BMP, EPS, GIF, ICO, JPG, PDF, PS, PCX, PNG, TGA, TIFF, and WBMP
Zamzar Review and Link
I've repeatedly tested Zamzar and have found the conversion time slower than most other online image converter services. Try an actual software program or one of the other online image converter services before Zamzar. More »
Adapter is an intuitive image converter program that supports popular file formats and plenty of nice features.
In its simplest form, Adapter lets you drag and drop images into the queue, and quickly choose the output format. You can clearly see the size of the image files before and after they'll be converted.
Adapter also has advanced options if you want to use them, such as custom file names and output directories, resolution and quality changes, and text/image overlays.
Input Formats: JPG, PNG, BMP, TIFF, and GIF
Output Formats: JPG, PNG, BMP, TIFF, and GIF
Download Adapter for Free
I like Adapter because it seems to work very quickly and doesn't require you to upload your files online to convert them.
Adapter not only converts image files but also video and audio files.
You can install Adapter to both Windows and Mac operating systems. I tested Adapter in Windows 10 without any issues. More »
6. DVDVideoSoft's Free Image Convert and Resize
Free Image Convert and Resize is a program that does just what you'd think it does - converts and resizes images.
Though it doesn't support very many image formats, it does let you convert, resize, and rename multiple image files at once.
Input Formats: JPG, PNG, BMP, GIF, and TGA
Output Formats: JPG, PNG, BMP, GIF, TGA, and PDF
Download Free Image Convert and Resize for Free
Note: The installer tries to add a few additional programs to your computer that you don't need to have for the image converter to work, so you can feel free to skip over them if you wish.
I like this program because it's very simple to use, supports popular image formats, and includes some additional features you may not find bundled in with other image converters.
Free Image Convert and Resize works with Windows 10, 8, 7, Vista, and XP. More »
PixConverter is another free image converter. Though it has plenty of useful features, it still manages to be easy to use.
The program supports batch conversions, the ability to import multiple photos from a folder at once, image rotation, resizing, and altering the image color.
Input Formats: JPG, JPEG, GIF, PCX, PNG, BMP, and TIF
Output Formats: JPG, GIF, PCX, PNG, BMP, and TIF
Download PixConverter for Free
PixConverter is a nice image converter if you deal with these formats and would rather not use an online converter.
Windows 8, Windows 7, and Windows Vista are the only versions of Windows that are officially supported, but PixConverter works equally well in Windows 10. More »
SendTo-Convert is an awesome image converter. The program can be automated to the point that you simply have to right-click one or more images and choose the Send to > SendTo-Convert option to convert them.
This means you can set the default output format, quality, size option, and output folder so as to quickly convert images without having to open the SendTo-Convert program.
Input Formats: BMP, PNG, JPEG, GIF, and TIFF
Output Formats: BMP, PNG, JPEG, and GIF
Download SendTo-Convert for Free
This download link takes you to a page that has several other programs listed, the bottom one being for SendTo-Convert.
You can also download a portable version of SendTo-Convert from the download page.
SendTo-Convert can be used on Windows 10, 8, 7, Vista, and XP. More »
9. Image Espresso
Image Espresso is yet another free online image converter, which means you don't need to download any software to use it.
After uploading an image, you can resize, crop, and rotate it, as well as add special effects like black and white and swirl, overlay text, and change brightness, contrast, and sharpness, among other settings.
Image Espresso also lets you rename the picture and choose a quality/size before saving it.
Input Formats: JPG, TIF, PNG, PSD, BMP, GIF, JP2, PICT, JPC, PCX, and SGI
Output Formats: BMP, PICT, GIF, JP2, JPC, JPG, PCX, PDF, PNG, PSD, SGI, TGA, TIF, WBMP, AVS, CGM, CIN, DCX, DIB, DPX, EMF, FAX, FIG, GPLT, PAM, MAT, PCD, PCL, RGB, WMF, WPG, XBM, and others
Visit Image Espresso
Image Espresso can only upload an image if it's not larger than 10 MB in size.
Unlike with the installable programs from above, Image Espresso can be used on any operating system that supports a web browser, including Windows, Linux, and Mac. More »