PDB to G4 Converter

Change PDB to G4 format — no installation required

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Drop files here. 1 GB maximum file size or Sign Up

Any Device, Any OS

Desktop, laptop, tablet, phone — the converter handles PDB to G4 equally well on every device and operating system.

Fast Processing

Most PDB to G4 conversions complete within seconds. Upload, convert, and download — the entire workflow takes under a minute.

Reliable Output

Count on accurate results from your PDB to G4 conversion. The converter faithfully reproduces your original content.

How to convert PDB to G4

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

Choose g4 or any other format you need as a result (more than 200 formats supported)

Let the file convert and you can download your g4 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

G4 is a monochrome image format based on the ITU-T Group 4 facsimile coding standard (Recommendation T.6), ratified by the CCITT in 1984 as an improvement over Group 3 for use on error-free digital networks like ISDN rather than analog telephone lines. G4 files contain 1-bit image data compressed using exclusively two-dimensional Modified Modified READ (MMR) coding, where each scanline is encoded as a set of differences (changing elements) relative to the line above it. By eliminating the one-dimensional coding fallback and the end-of-line synchronization markers required by Group 3, G4 achieves 20-50% better compression ratios on typical document pages while producing a simpler, more regular bitstream. The format is most commonly encountered as a compression method within TIFF files (TIFF compression tag 4), where it became the standard archival format for scanned documents in enterprise document management, government records, and legal imaging systems. G4 compression is specified at 200, 300, or 400 dpi depending on the scanning application, with 300 dpi being the most common for archival-quality document imaging. One advantage is exceptional compression efficiency for document content: G4's two-dimensional prediction exploits the strong vertical correlation in text and line art pages, typically compressing a 300 dpi letter-size page to 30-50 KB — roughly half the size of equivalent Group 3 encoding. The format's entrenchment in document management infrastructure is another strength — G4 TIFF is the mandated format for many government digital records systems, court filing systems, and corporate archives, supported by every enterprise imaging platform.

Developer: ITU-T (CCITT)

Initial release: 1984

Frequently Asked Questions

Why convert PDB to G4?

G4 offers high-compression fax encoding — converting from the legacy PDB format gives your content modern compatibility.

What programs open G4 files?

You can open G4 files with fax software, document scanners, IrfanView. Most platforms have at least one built-in or free option available.

Do I need to create an account to convert?

No sign-up necessary. The converter works without an account for regular PDB to G4 conversions.

Does the converter work on mobile devices?

It works on any device with a web browser — smartphones, tablets, laptops, and desktops all handle the conversion.

Will image dimensions change during conversion?

No — the converter keeps the same image size. Dimensions only change if you explicitly set resize options.

Is the conversion process secure?

Security is built in — source PDB files and converted G4 outputs are automatically removed from servers after processing.

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

JPG to G4

PNG to G4

PDF to G4

JPEG to G4

PPTX to G4

TIFF to G4

HTML to G4

GIF to G4

DOCX to G4

JFIF to G4

SVG to G4

XLSX to G4

TXT to G4

WEBP to G4

ICO to G4

PPSX to G4

PGX to G4

PS to G4

HEIC to G4

XLS to G4

G3 to G4

DOC to G4

CR2 to G4

CDR to G4

BMP to G4

ABW to G4

DBK to G4

KWD to G4

SXW to G4

AW to G4