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ECW JP2
File conversion

Convert ECW to JP2

Verified by Adam B.· reviewed by FE Editorial ·updated Jul 20, 2026
QUICK ANSWER
Is it possible to convert ECW to JP2?
Yes - ECW converts to JP2.

The fastest route for GIS files is GDAL's gdal_translate command or QGIS's Save As dialog; IrfanView and XnView MP work for straightforward image conversion. Georeferencing data is preserved as GeoJP2 metadata, but re-encoding between two wavelet formats causes a small quality loss unless you request lossless output.

2 programs
Also to JP2: JPF · SID · NB

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert ECW to JP2?

ECW is a proprietary format introduced in 1998 that requires the Hexagon ERDAS SDK, limiting which applications can open it. .jp2 is an ISO open standard (ISO/IEC 15444-1, 2000) with wide support in GIS tools, web mapping servers, and image viewers. It supports both lossy and lossless compression and is a common delivery format from national mapping agencies, making it the natural portable replacement for ECW when coordinates must be kept.

How to convert ECW to JP2

GDAL FREE

Run gdal_translate -of JP2OpenJPEG input.ecw output.jp2 in a terminal; add -co LOSSLESS=YES for lossless output or -co QUALITY=85 to control lossy compression quality.

QGIS FREE

Add the .ecw as a raster layer, right-click it in the Layers panel, choose Export > Save As, set the format to JPEG2000, and click OK. Georeferencing is preserved automatically.

IrfanView FREE

Open the .ecw in IrfanView and use File > Save As, selecting JP2 as the output format.

XnView MP FREE

Open the .ecw in XnView MP and use File > Export, selecting JPEG 2000 (.jp2) as the target format.

Programs that convert ECW

IrfanView
XnView MP

About these formats

.ECW Enhanced Compression Wavelet (ECW) image

An ECW file is a wavelet-compressed aerial or satellite image used in GIS software. To view one for free on Windows, use IrfanView (with plugin pack) or QGIS; QGIS also works on macOS and…

Open .ECW details →
.JP2 JPEG 2000 Image (ISO/IEC 15444-1)

A JP2 file is a JPEG 2000 image - a wavelet-compressed raster format that supports both lossy and lossless compression. On Windows, open it with the free IrfanView (plus its JPEG 2000…

Open .JP2 details →

Quality & what to watch

  • Georeferencing is preserved: projection, coordinate system, and spatial extent from the ECW are written into the JP2 as GeoJP2 metadata, so the output loads at the correct map position in GIS tools.
  • Both formats use wavelet compression; conversion is a decode-then-re-encode operation that adds a generation of quality loss unless you use lossless JP2 output.
  • GDAL must be built with JP2OpenJPEG support; verify with gdalinfo --formats | grep JP2 before running the conversion.

Frequently asked questions

Does converting ECW to JP2 lose the coordinate data?
No - georeferencing is written into the JP2 as GeoJP2 metadata and the output file opens at the correct map position in QGIS, ArcGIS, and similar tools.
Is there a quality loss when converting ECW to JP2?
Yes, unless you specify lossless output - both formats use wavelet compression, so re-encoding adds a generation of quality loss.
Can I crop a large ECW before converting to JP2?
Yes - GDAL supports cropping before conversion using the -srcwin option to specify an offset and size.