How to convert HEIF to PNM
To convert HEIF to PNM, upload your HEIF file, choose PNM as the output format and press Convert. The finished PNM 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 HEIF images into PNM 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 HEIF to PNM
- One extension for the whole Netpbm family
- Uncompressed and simple
- Friendly to scripting
- Works with: GIMP, ImageMagick, Netpbm and OpenCV
What to expect from this conversion
- HEIF is lossy and PNM is not, so the file will usually get larger. Converting cannot bring back detail that HEIF compression already removed.
- PNM has no transparency, so transparent areas are filled with a background colour. White by default, and you can choose another colour in the options.
- PNM cannot store animation here, so only the first frame of an animated HEIF is saved.
- Browsers do not display PNM files, so use it in editors, print workflows or development tools rather than on a web page.
HEIF vs PNM
| Property | HEIF | PNM |
|---|---|---|
| Full name | High Efficiency Image File Format | Portable Anymap |
| Released | 2015, MPEG | 1988, Jef Poskanzer (Netpbm) |
| Compression | Lossy | None (uncompressed) |
| Transparency | Yes | No |
| Animation | Yes | No |
| Bit depth | 8 or 10-bit | 1, 8 or 16-bit |
| Shown in browsers | No | No |
| Best for | efficient photo storage; camera and phone workflows | Unix-style image pipelines; teaching and research |
Steps to convert HEIF to PNM
- Drop your HEIF image file onto the converter, or click to choose it.
- Check that PNM is selected as the target and adjust the options if you want.
- Press Convert, then download your new PNM 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 HEIF to PNM?
Drop your HEIF files on the converter, confirm that PNM is the target and press Convert. Download each file or the whole batch as a ZIP.
Is the HEIF to PNM 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 HEIF to PNM reduce quality?
HEIF is lossy and PNM is not, so the file will usually get larger. Converting cannot bring back detail that HEIF compression already removed. The quality slider only affects formats that use lossy compression.
Will transparency be kept when I convert HEIF to PNM?
PNM does not support transparency, so transparent areas are filled with your chosen background colour (white by default).
Which programs open PNM files?
PNM files open in GIMP, ImageMagick, Netpbm and OpenCV.
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.