PDB to PGM Converter

Online PDB to PGM conversion — instant results

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Reliable Output

Count on accurate results from your PDB to PGM conversion. The converter faithfully reproduces your original content.

Cloud Processing

The heavy lifting happens on our servers. Your device does not process anything — just upload PDB and download PGM.

Any Device, Any OS

Desktop, laptop, tablet, phone — the converter handles PDB to PGM equally well on every device and operating system.

How to convert PDB to PGM

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

Choose pgm or any other format you need as a result (more than 200 formats supported)

Let the file convert and you can download your pgm file right afterwards

About formats

PDB (Palm Database) is a generic database container format created by Palm, Inc. for the Palm OS platform, first appearing with the original PalmPilot in March 1996. In the ebook context, PDB files most commonly use the PalmDOC or Plucker encoding to store readable text with basic formatting. The format consists of a 78-byte header identifying the database name, creation date, and record count, followed by a record index table and the data records themselves. PalmDOC-encoded PDB files use a simple LZ77-based compression scheme to pack plain text efficiently, while Plucker extends this with HTML rendering, image support, and hyperlink navigation. PDB ebooks powered a thriving mobile reading ecosystem years before dedicated e-readers existed — millions of Palm OS users carried entire libraries on devices like the Palm V, Tungsten, and Treo handhelds. A primary advantage is extreme simplicity: the flat record structure and minimal overhead mean PDB files parse instantly even on severely constrained hardware with limited memory and processing power. The open, well-documented structure is another strength, having spawned numerous reader applications across Palm OS, Windows, and later mobile platforms. Though the Palm platform is long discontinued, PDB ebooks remain accessible through conversion tools and readers like Calibre, and the format holds historical significance as one of the earliest practical mobile ebook solutions.

Developer: Palm, Inc.

Initial release: March 1996

PGM (Portable Graymap) is the grayscale member of the Netpbm image format family, created by Jef Poskanzer in 1988 as part of the Pbmplus toolkit for Unix systems. PGM stores single-channel intensity images where each pixel holds a gray value from 0 (black) to a user-specified maximum (typically 255 for 8-bit or 65535 for 16-bit). The format exists in ASCII (magic number P2), where pixel values are written as decimal text numbers separated by whitespace, and binary (magic number P5), where values are stored as raw bytes. Both variants begin with a header specifying the magic number, width, height, and maximum gray value. PGM was designed as the grayscale intermediate in Netpbm's convert-process-convert pipeline philosophy: source images from any format are converted to PGM, processed using Netpbm's extensive command-line tool library, then converted to the target format. One advantage is format transparency — the ASCII variant makes image data directly readable by humans and trivially processable by text tools like awk and grep, invaluable for debugging and education. The scientific and computer vision community's adoption is another strength: PGM's straightforward single-channel representation makes it a natural format for image analysis algorithms, and many academic papers and course materials use PGM examples. The format is supported by ImageMagick, GIMP, and countless image processing libraries, and remains standard input for many research tools and benchmarks.

Developer: Jef Poskanzer

Initial release: 1988

Frequently Asked Questions

Why convert PDB to PGM?

PDB is an obsolete Palm format. Converting to PGM provides grayscale raster and opens your content to modern viewers.

What programs open PGM files?

Open PGM with GIMP, IrfanView, Netpbm tools, scientific software. On mobile devices, built-in gallery apps or third-party viewers also handle this format.

Can I convert multiple PDB files to PGM at once?

Yes — upload several PDB files simultaneously and convert them all to PGM in a single batch operation.

Is the PDB to PGM conversion instant?

Processing is fast — most PDB files convert to PGM within a few seconds, depending on image dimensions and server load.

Do I need to create an account to convert?

No sign-up necessary. The converter works without an account for regular PDB to PGM conversions.

Will I lose image quality converting PDB to PGM?

Quality stays intact during conversion. The output PGM file faithfully represents what was stored in the original PDB image.

Related Conversions

PDB to PDF

PDB to EPUB

PDB to MOBI

PDB to DOC

PDB to JPG

PDB to SVG

PDB to DOCX

PDB to TXT

PDB to FB2

PDB to GIF

PDB to XLS

PDB to PNG

PDB to RTF

PDB to CSV

PDB to XLSX

PDB to JPEG

PDB to DXF

PDB to PPT

PDB to PPTX

PDB to ODT

PDB to HTML

PDB to AI

PDB to PS

PDB to TIFF

PDB to PLT

PDB to AZW3

PDB to WBMP

PDB to BMP

PDB to WEBP

PDB to DDS

PDB to SNB

PDB to DOCM

PDB to PSD

PDB to JP2

PDB to LRF

PDB to PBM

PDB to RB

PDB to TCR

PDB to TGA

PDB to PCX

PDB to ICO

PDB to CUR

PDB to PGM

PDB to PPM

PDB to EXR

PDB to FAX

PDB to FTS

PDB to G3

PDB to HDR

PDB to HRZ

PDB to IPL

PDB to MAP

PDB to MNG

PDB to MTV

PDB to OTB

PDB to PAL

PDB to PALM

PDB to PAM

PDB to PCD

PDB to PCT

Specific converters

BMP to PGM

JPG to PGM

PNG to PGM

PDF to PGM

JPEG to PGM

DXF to PGM

DOCX to PGM

PPM to PGM

TXT to PGM

GIF to PGM

XCF to PGM

PBM to PGM

TIFF to PGM

JFIF to PGM

SVG to PGM

WEBP to PGM

HTML to PGM

DDS to PGM

PSD to PGM

EPS to PGM

DOC to PGM

XLSX to PGM

XLS to PGM

PPTX to PGM

DCM to PGM

CR2 to PGM

NEF to PGM

CDR to PGM

HEIC to PGM

ICO to PGM