Free online JPM to ICO converter

Windows shortcuts, application resources, installers, and some favicon setups require an .ico file rather than a JPEG 2000 compound image. Conversion renders the usable JPM image content as an icon raster; it does not retain the source document structure.

What the JPM format contains

JPM is the JPEG 2000 Part 6 Compound Image File Format, normally identified by the .jpm extension. Unlike an ordinary single-image JPEG, a JPM file can package JPEG 2000 image data with compound-page information such as image regions, masks, composition data, and metadata.

JPM is used mainly by specialized document-imaging, scanning, technical publishing, and JPEG 2000 workflows; it is uncommon in mainstream photo-editing software. Some programs also use .jpm for unrelated proprietary files, so first verify that the file opens in JPM-capable software.

What an ICO file provides

ICO is the Windows icon container format. A single ICO file can hold several raster images at different dimensions, allowing Windows to select a suitable version for a small shortcut, a larger application tile, or a high-DPI display.

Useful sizes include 16×16, 32×32, 48×48, and 256×256 pixels; 20, 24, 40, 64, and 128 pixels are also used in some interfaces. Modern ICO files can contain PNG-compressed images with full alpha transparency, while older icon consumers may require BMP/DIB-based entries.

Convert the file

1. Open the JPM converter on 101convert.com and upload the .jpm file.
2. Select ICO as the output format, run the conversion, and download the resulting .ico file.
3. Test the result by assigning it to a Windows shortcut or viewing it in File Explorer before adding it to an application or installer.

If the source is a multi-page or compound JPM document, the converter can only produce an icon from its rendered image content. Export or render the required page or composition separately when each page needs its own icon.

Create a multi-size ICO on a desktop system

For an application icon that needs several embedded sizes, open the JPM file in software that supports JPEG 2000 Part 6 and export the required rendered page as a PNG. Use a source of at least 256×256 pixels; PNG preserves transparency when the rendered result has an alpha channel.

ImageMagick can create a multi-resolution ICO from that PNG:

magick exported.png -background none -resize 256x256 -gravity center -extent 256x256 -define icon:auto-resize=16,20,24,32,40,48,64,128,256 output.ico

This command preserves proportions, centers the image on a transparent 256-pixel canvas, and generates smaller icon entries. It requires an ImageMagick installation that can read the exported PNG; JPM support itself depends on the JPEG 2000 delegates included with the installation, so exporting JPM to PNG in its native imaging software is usually the more reliable first step.

To make the artwork fill the square icon instead of adding transparent padding, crop it before creating the ICO:

magick exported.png -resize 256x256^ -gravity center -extent 256x256 icon.png

Then use icon.png as the input to the ICO command. Review the crop carefully because important edges can be removed.

Quality and compatibility limits

• ICO is raster-based: conversion cannot restore detail absent from the rendered JPM image.
• Fine text, thin lines, and detailed photographs often become unreadable at 16×16 or 32×32 pixels. Edit those small representations manually when the icon must remain recognizable.
• A square, high-contrast source produces better results than a wide page or a full document scan. Crop to the relevant mark or image region before conversion.
• JPM layers, annotations, page navigation, and editable compound-document data are not preserved in ICO.
• Older Windows software can reject ICO files containing only PNG-based entries. If that occurs, create 16×16, 32×32, and 48×48 BMP/DIB-compatible entries with a desktop icon editor and test them in the target program.