PGM to PNG Converter
Convert PGM to PNG in your browser. PGM files usually come from computer vision datasets, depth sensors and scientific cameras; PNG is the better fit for screenshots, logos, graphics and anything that needs transparency. You get a lossless 8-bit PNG with full alpha. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
PGM expected · other image formats also work
How to use PGM to PNG
- 1
Add your PGM files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the PNG is written losslessly. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .png files one at a time or together as a ZIP.
Why use Aback Images for pgm to png
Where the PNG goes next
PNG opens in every browser, operating system and image editor.
PNG next to PGM
Both sides are lossless, so the size depends on how well the PNG encoder handles this picture compared with the PGM's none.
Written without a lossy pass
The PNG is written losslessly, so the pixels decoded from the PGM arrive unchanged, apart from precision beyond 8 bits per channel.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
PGM vs PNG
What changes from PGM to PNG
Encoding: the PGM uses none; PNG uses lossless DEFLATE with a prediction filter chosen per row, and the download is a lossless 8-bit PNG with full alpha.
Bit depth: 8 or 16 bits per sample in the PGM; PNG allows 1, 2, 4, 8 or 16 bits per channel, and the PNG written here has 8 bits per channel. 16-bit PGM files, common for depth maps, are reduced to 8 bits.
Colour: greyscale only in the PGM; PNG supports RGB, greyscale, or an indexed palette of up to 256 colours, written here as 8-bit sRGB.
Metadata: the PGM can carry only comment lines in the header; PNG can carry text chunks, an ICC profile, physical resolution and EXIF in an eXIf chunk, but nothing is copied across.
About PGM
PGM is the greyscale member of the Netpbm family, common in computer vision and scientific imaging.
A binary PGM starts with 'P5', the width, height and maximum grey value, then one sample per pixel. The plain 'P2' variant stores the samples as text.
PGM files usually come from computer vision datasets, depth sensors and scientific cameras.
About PNG
PNG stores pixels losslessly with full alpha transparency. It is ideal for screenshots, logos, UI and anything with sharp edges, but photos saved as PNG are several times larger than JPEG.
A PNG opens with an 8-byte signature and is a chain of chunks, each with its own CRC: IHDR (size, depth, colour type), optional PLTE and tRNS for palettes, one or more IDAT chunks with the compressed rows, and IEND.
When converting PGM to PNG makes sense
PNG is the better choice for screenshots, logos, graphics and anything that needs transparency, while PGM suits greyscale image processing.
PNG strengths: Lossless: no quality loss, ever; Full transparency with smooth edges; Perfect for text, screenshots and graphics. Drawbacks to weigh: Large files for photographs; No standard animation (that is APNG).
Limitations
- A PGM is greyscale, so the converted file is grey too even in a colour format.
- Depth maps and disparity maps saved as 16-bit PGM hold distances, not brightness; the converted picture is a visualisation of them.
- Many datasets store medical or thermal images as PGM with a narrow range of values, which can look almost uniformly grey until the contrast is stretched with Adjust Colours.
- A PNG of a photograph is often several times larger than a JPG; PNG pays off for screenshots, graphics and anything with transparency.
- The PNG is written in full colour; Compress PNG can shrink it further with a palette.
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Frequently asked questions
Does converting PGM to PNG lose quality?
PNG is written losslessly, so the pixels are stored exactly as decoded. 16-bit PGM files, common for depth maps, are reduced to 8 bits.
Which apps open PNG files?
Every browser, operating system and image editor.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.