Convert HEIC to PNM
Convert HEIC files to PNM locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert HEIC to PNM
- Drop your .heic files above, or click Upload Files. You can add many files at once.
- PNM is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. ImageMagick runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .pnm files as soon as each one finishes.
What to know about HEIC to PNM conversion
- HEIC photos from iPhone and Android are decoded locally; your photos are never uploaded to a server.
- PNM is lossless: it stores the decoded image exactly, which usually makes files larger than the original HEIC, but prevents further quality loss when you edit again.
- PNM has no transparency, so transparent areas of the HEIC are filled with white.
- PNM is best for image processing pipelines and scientific code, and opens in GIMP, ImageMagick and Netpbm tools.
HEIC vs PNM
| Feature | HEIC (High Efficiency Image Container) | PNM (Netpbm Portable Anymap) |
|---|---|---|
| Compression | lossy | uncompressed |
| Transparency | Yes | No |
| Animation | No | No |
| Best for | photos taken with iPhones and recent Android phones | image processing pipelines and scientific code |
| Opens in | Apple devices, and Windows with the HEIF extensions | GIMP, ImageMagick and Netpbm tools |
HEIC (High Efficiency Image Container): The default photo format on iPhones and many Android devices, based on the HEVC codec.
PNM (Netpbm Portable Anymap): The generic Netpbm format family (PBM, PGM, PPM) for simple uncompressed bitmaps, graymaps and pixmaps.
Conversion options
- Resize by width, height or both (aspect ratio is preserved)
- Filters: grayscale, sepia, blur and sharpen
- Custom output file name
Frequently asked questions
Is it safe to convert HEIC to PNM here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several HEIC files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Convert HEIC to other formats
- HEIC to JPG
- HEIC to PNG
- HEIC to PDF
- HEIC to WEBP
- HEIC to GIF
- HEIC to SVG
- HEIC to AVIF
- HEIC to ICO
- HEIC to TIFF
- HEIC to BMP
- HEIC to JXL
- HEIC to PSD
Convert other formats to PNM
- JPG to PNM
- PNG to PNM
- PDF to PNM
- WEBP to PNM
- GIF to PNM
- SVG to PNM
- AVIF to PNM
- ICO to PNM
- TIFF to PNM
- BMP to PNM
- JXL to PNM
- PSD to PNM
See every HEIC converter and PNM converter, or browse the full converter directory.