Convert Netpbm images (PPM, PGM, PBM) to PNG locally - lossless, no upload, right in the browser.
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
PPM, PGM and PBM belong to the Netpbm family - deliberately simple raster formats from the Unix world that almost every scientific, graphics or image-processing tool can write. Their structure is about as plain as it gets: a tiny header of a magic number, width, height and maximum value, followed by the raw pixel data. That very simplicity makes them popular as an intermediate format - but useless for viewing or sharing, because hardly any image viewer or browser opens them. PNG, by contrast, is universal, lossless and displays everywhere.
This tool reads all six Netpbm variants: the binary ones (P6 colour, P5 grayscale, P4 black-and-white) as well as the text-based ASCII forms (P3, P2, P1), including comments in the header and a maximum brightness other than 255, which is scaled correctly to 8 bit. Grayscale is spread across RGB and the result is an opaque PNG. The conversion runs entirely locally in your browser with a lean JavaScript decoder - no upload, even offline, and with no third-party library. Very large images are capped to protect memory.
You will meet this when a program such as ImageMagick, GIMP, a renderer or a research tool has emitted an image as PPM, PGM or PBM and you now want to view it, drop it into a document or simply pass it on. PNG is lossless and transparency-capable - ideal for exactly this pixel-for-pixel faithful transfer. For plain photos where file size matters, a JPG is the more compact choice afterwards.
| Input formats | PPM, PGM, PBM, PNM |
|---|---|
| Output format | PNG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: The Netpbm formats PPM, PGM and PBM are supported in binary (P6/P5/P4) and ASCII form (P3/P2/P1); 16-bit values are scaled to 8 bit. Netpbm has no transparency - the PNG is opaque. Very large images are capped, and a file without a valid Netpbm header is rejected honestly rather than producing a blank image.
The Netpbm formats: PPM stores colour, PGM grayscale, PBM pure black-and-white. They have a very simple structure and are a popular intermediate format in image processing.
No. The conversion happens entirely locally in the browser - even offline.
Yes. Both are read: the binary variants P6/P5/P4 and the text-based P3/P2/P1.
Yes. PNG is lossless; the pixels are taken one to one. 16-bit values are scaled to 8 bit.
No. Netpbm has no alpha channel, so the resulting PNG is fully opaque.