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File converter / Images / Convert to JPEG / PGM converter / JPEG to PGM

Convert JPEG to PGM

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Choose file to convert to .pgm
or drag and drop file

You can convert JPEG image to PGM as well as to variety of other formats with free online converter.

How to convert jpeg to pgm?

How to convert pgm to jpeg?
Step 1

Upload jpeg-file

Select file, which you want to convert from your computer, Google Drive, Dropbox or drag and drop it on the page
Step 2

Select «to pgm»

Select pgm or any other format, which you want to convert (more 200 supported formats)
Step 3

Download your pgm file

Wait till your file will be converted and click download pgm -file

Online and free jpeg to pgm converter

Fast and easy
Just drop your jpeg files on the page to convert pgm or you can convert it to more than 250 different file formats without registration, giving an email or watermark.
Don't worry about security
We delete uploaded jpeg files instantly and converted pgm files after 24 hours. All files transfer with secured an advanced level of SSL encryption.
All in the cloud
You don't need to install any software. All jpeg to pgm conversions make in the cloud and don't use any resources of your computer.

Joint Photographic Experts Group

File extension .jpeg
File category images
Description JPEG – is a popular graphic file format, which is characterized by a high degree of compression, which leads to a decrease in image quality. It uses the technology of encoding of smooth color renditions, providing the ability to reduce the amount of data frequently during the recording of the image. Because of the small size it is requested by the owners of websites, allowing you to save the traffic effectively. It is also frequently used in memory cards of digital video cameras. The JPEG algorithm is optimally suitable for compressing photographs and pictures, in which realistic scenes with little contrast of colors are present. It is not recommended to use this format for compression of drawings and various kinds of graphics, since a strong contrast between a number of closely located pixels provokes the appearance of visible artifacts.
Technical details The procedure for compressing the digital images in JPEG format is carried out in several stages. First, the photo is transformed into a color space YCbCr, then it is divided into squares to determine the upper range of the color spectrum. Finally, the colors and brightness are coded. JPEG uses a "lossy" compression system and discrete cosine transform technology. The format acts simultaneously as the standard of ISO and the International Telecommunication Union. The file compression ratio is in the range from 10:1 to 100:1. In this case, the reduction in image quality can vary from insignificant to substantial.
Programs
Adobe Photoshop
Apple Preview
Corel Paint Shop Pro
Main program MS Paint
Developer The JPEG Committee
MIME type
image/jpeg

Portable Gray Map Image

File extension .pgm
File category images
Description PGM file format was developed alongside the open-source Netpbm package of graphics program. Developed by Jef Poskanzer in 1988, PGM was a format for storing grayscale images and supporting bitmap. The PGM file format is forward compatible with recent graphics editing software like Corel PaintShop Pro X4, ACDSee Photo Manager 14, and ACD Systems Canvas 15. Being a plain text format, PGM can be edited using any available text editor, and thus survives the quintessential changes that image files undergo when transmitted via email. PGM files come in two types, only differentiated by magic numbers – P2 and P5, which helps graphics editor software identify the data encryption standard.
Technical details Portable Gray Map Images can be stored away with each pixel taking up memory space of either 8 or 16 bits. There are two major sections in the plain text string of a PGM file – the header and image data. The header starts with the magic number, followed by characters indicating image width, image height, maximum grayscale shade value – never exceeding 65.536, all sandwiched by whitespaces. Though used mainly on the UNIX-based operating system, being open-source has earned the PGM file compatibility with macOS and Windows.
Programs
ACD Systems ACDSee 18
ACD System Canvas 15
Adobe Photoshop with plug-in
Corel PaintShop Pro X8
GIMP
Inkscape
Netpbm
Developer Jef Poskanzer
MIME type
application/octet-stream

FAQ

❓ How can I convert jpeg to pgm?
Firstly, select a jpeg file you want to convert or drag and drop it. Secondly, select pgm or any other format you want to convert your file to. Then click convert and wait until your file is converted
⏳ How long should I wait to convert jpeg to pgm?
images conversion usually takes a few seconds. You will convert jpeg to pgm very quickly.
🛡️ Is it secure to convert jpeg to pgm on OnlineConvertFree?
Sure! We delete your uploaded and converted files, so nobody has access to your information. All types of conversion on OnlineConvertFree (including jpeg to pgm) is 100% safe.
📱 Can I convert jpeg to pgm without software installation?
Absolutely! OnlineConvertFree doesn’t require installation. You can convert any files (including jpeg to pgm) online on your computer or mobile.