ICO to PGX Converter

Free online ICO to PGX converter with instant results

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Expand Usability

ICO is limited to icons and favicons — converting to PGX gives you a standard format that works in image editors, documents, and beyond.

Runs in the Cloud

All processing for ICO to PGX happens remotely on Convertio servers, keeping your own hardware free for other tasks.

Privacy Protection

Your uploaded ICO files are removed right after conversion, and PGX results are deleted from servers within 24 hours — your data stays private.

How to convert ICO to PGX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose pgx or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your pgx file right afterwards

About formats

ICO is the icon file format for Microsoft Windows, introduced with Windows 1.0 in 1985 and serving as the standard container for application icons, file type icons, and shortcut icons throughout the Windows ecosystem. An ICO file bundles multiple image variants within a single container — each at different sizes (16x16, 32x32, 48x48, 256x256, and others) and color depths (4-bit, 8-bit, 24-bit, 32-bit with alpha) — allowing Windows to select the most appropriate image for each display context, from tiny taskbar buttons to large desktop icons. The container structure consists of an ICONDIR header, an array of ICONDIRENTRY records describing each variant, and the image data itself. Since Windows Vista, ICO files support embedded PNG-compressed images for the larger sizes (typically 256x256), dramatically reducing file size while maintaining quality with full alpha transparency. One advantage is automatic size adaptation — Windows pulls the optimal resolution from the ICO container for each context (Explorer list view, desktop tile, Alt-Tab preview), ensuring crisp display without the application managing separate image files. The format's operating system-level integration is another core strength: ICO files serve as the identity mechanism for executables, file associations, and shortcuts across all Windows versions, and web browsers use favicon.ico for website identity in tabs and bookmarks. ICO creation and editing is supported by image editors like GIMP, Inkscape, and dedicated icon tools, and the format remains essential for Windows application development.
Developer: Microsoft
Initial release: 1985
PGX is a simple single-component raster image format defined as part of the JPEG 2000 standard (ISO/IEC 15444) for use in conformance testing and verification of JPEG 2000 codec implementations. Introduced around 2000 alongside the JPEG 2000 specification itself, PGX files store a single image component (one color channel or grayscale plane) with a text header followed by raw pixel data, providing an unambiguous reference representation against which encoder and decoder outputs can be compared sample by sample. The header is a single ASCII line specifying endianness (ML for big-endian, LM for little-endian), signedness (+ for unsigned, - for signed), bit depth (1 to 32 bits), width, and height. The pixel data follows as raw binary values, each occupying the minimum number of bytes needed for the specified bit depth, with one value per pixel. For multi-component images (like RGB), each component is stored in a separate PGX file. The format's deliberate simplicity — no compression, no metadata, no multi-channel support — ensures there are no ambiguities in interpretation that could mask codec bugs. One advantage is verification precision: PGX's uncompressed, exactly-specified representation allows bit-exact comparison of decoded JPEG 2000 output against reference images, essential for certifying that a codec implementation conforms to the standard. The format's role in the JPEG 2000 conformance testing framework means it is implemented by every serious JPEG 2000 codec (OpenJPEG, Kakadu, etc.) and used in the official ISO conformance test suite. PGX files can also be processed by ImageMagick and various JPEG 2000 development tools.
Initial release: 2000

Frequently Asked Questions

Why convert ICO to PGX?

PGX creates a single-component JPEG 2000 test image — useful for codec conformance testing and JPEG 2000 validation workflows.

What programs open PGX files?

You can open PGX files with OpenJPEG tools, JPEG 2000 testing suites. Free alternatives are available for every platform.

Can I use this on Mac and Linux?

The converter is entirely browser-based — it works on macOS, Linux, Windows, and any other platform with a modern web browser. No OS-specific software needed.

Is batch ICO to PGX conversion available?

Absolutely — upload multiple ICO files simultaneously and convert them all to PGX at once. Batch mode saves considerable time on repetitive conversions.

How long does ICO to PGX conversion take?

Most conversions complete within seconds. Processing time depends on file size and server load, but the entire workflow typically finishes in under a minute.

What happens to my uploaded files?

Your ICO files are automatically deleted right after conversion. The resulting PGX files remain available for download for 24 hours, then they are permanently removed.

ICO to PGX Quality Rating

4.0 (2 votes)
You need to convert and download at least 1 file to provide feedback!