How to Convert Multiple JXL Images to JP2?
1. Download and Install reaConverter
First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed. Apply image edits like resize, crop, or color adjustment while converting.
2. Load your JXL files
Open reaConverter and import your .jxl files. No file limits, no slowdowns. Add as many as you need.
Drag files into the window, use the Add Files button, or select entire folders.
3. Select JP2 as output format
Select JP2 as target format and pick where to save results. You can keep default settings or fine-tune the output.
4. Start JXL to JP2 conversion
Hit Convert to process your files. The log window shows progress, timing, and status for every file.
Conversion complete? Your JP2 files are saved to the destination folder, ready to use.
Before you convert JXL to JP2
JXL and JP2 both compress by discarding data, so this is a re-encode rather than a copy. The output is built from already-compressed pixels, and the artefacts of the first encode are carried into the second. Use a high quality setting, and convert from the original whenever you still have it. One JXL file can hold several pages or frames, while JP2 holds one image each. reaConverter writes a separate output file per page and numbers them, so a single input can produce a whole folder of results.
