How to convert PNM to JP2
To convert PNM to JP2, upload your PNM file, choose JP2 as the output format and press Convert. The finished JP2 file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter changes PNM images into JP2 files in seconds, with no software to install and no watermark. You can convert several files at once, resize them and choose the quality for formats that support it. Metadata such as location tags is removed from the output for privacy.
What you get with PNM to JP2
- Lossless and lossy in one format
- High bit depth
- Standard for archives and DICOM
- Works with: Safari, Photoshop, GIMP, Preview and archive systems
What to expect from this conversion
- JP2 can be saved lossy or lossless. Quality 100 gives a lossless result where the format supports it, and lower values give smaller files.
- Browsers do not display JP2 files, so use it in editors, print workflows or development tools rather than on a web page.
PNM vs JP2
| Property | PNM | JP2 |
|---|---|---|
| Full name | Portable Anymap | JPEG 2000 |
| Released | 1988, Jef Poskanzer (Netpbm) | 2000, Joint Photographic Experts Group |
| Compression | None (uncompressed) | Lossy or lossless |
| Transparency | No | Yes |
| Animation | No | No |
| Bit depth | 1, 8 or 16-bit | up to 16-bit |
| Shown in browsers | No | No |
| Best for | Unix-style image pipelines; teaching and research | digital libraries and archives; medical and geospatial images |
Steps to convert PNM to JP2
- Drop your PNM image file onto the converter, or click to choose it.
- Check that JP2 is selected as the target and adjust the options if you want.
- Press Convert, then download your new JP2 file when it finishes.
Tips for the best result
- Use quality 80 to 90 for photos: it is visually close to the original at a much smaller size.
- Set a width if the image will be shown on a small screen, which also reduces the file size.
- Choose a background colour before converting transparent images to a format without transparency.
Frequently asked questions
How do I convert PNM to JP2?
Drop your PNM files on the converter, confirm that JP2 is the target and press Convert. Download each file or the whole batch as a ZIP.
Is the PNM to JP2 converter free?
Yes. It is free with no watermark, no sign-up and no limit on how many images you convert. The site is supported by ads.
Does converting PNM to JP2 reduce quality?
JP2 can be saved lossy or lossless. Quality 100 gives a lossless result where the format supports it, and lower values give smaller files. The quality slider only affects formats that use lossy compression.
Will transparency be kept when I convert PNM to JP2?
PNM images do not contain transparency, so there is nothing to lose. JP2 supports it if you edit the image later.
Which programs open JP2 files?
JP2 files open in Safari, Photoshop, GIMP, Preview and archive systems.
How many images can I convert at once?
Up to 20 images per batch, each up to 60 MB. Files are deleted from the server about 30 minutes after conversion.