PNG to PDB Converter

Convert PNG images to PDB Palm ebook format free

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Ebook Creation

Package your PNG images into a PDB ebook — create visual books for Palm OS devices and compatible e-reader software.

Retro Compatible

PDB works on Palm OS handhelds, Calibre, and several modern ebook readers — bridging vintage and current reading platforms.

Secure Processing

All uploaded PNG files are deleted after conversion. PDB outputs are automatically removed from servers within 24 hours.

How to convert PNG to PDB

1

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

2

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

3

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

About formats

PNG (Portable Network Graphics) is a lossless raster image format developed by the PNG Development Group and published as a W3C Recommendation on October 1, 1996, created as a patent-free replacement for GIF after the Unisys LZW patent controversy. PNG uses a two-stage compression pipeline: a prediction filter selects the optimal per-row preprocessing (none, sub, up, average, or Paeth), then DEFLATE compression encodes the filtered data. The format supports rich color modes — 1/2/4/8/16-bit grayscale, 8/16-bit per channel true color, and indexed color with palettes up to 256 entries — all with optional alpha transparency ranging from a single transparent color to a full per-pixel alpha channel with 256 or 65536 levels. PNG also stores gamma correction, ICC color profiles, text metadata, and suggested background color. One advantage is lossless compression with transparency — PNG preserves every pixel exactly while supporting smooth semi-transparent edges, making it the standard format for web graphics, UI elements, logos, screenshots, and any image where artifacts or color shifts are unacceptable. Universal support is another core strength: every web browser, operating system, image editor, and programming library handles PNG natively. The format has proven remarkably durable — after nearly three decades, PNG remains the default lossless web image format. While newer formats like WebP and AVIF offer better compression, PNG's combination of lossless quality, full transparency, and absolute ubiquity keeps it indispensable.
Initial release: October 1, 1996
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

Frequently Asked Questions

Why convert PNG to PDB?

PDB is the standard ebook format for Palm OS devices and many simple e-readers. Converting PNG creates a visual ebook for these platforms.

What reads PDB files?

Calibre, FBReader, Palm OS devices, CoolReader, and various retro e-reader applications support PDB ebook format.

Is PDB still used?

While Palm OS is discontinued, PDB remains readable by Calibre and several modern ebook apps — useful for legacy device owners.

Is this conversion free?

Yes — PNG to PDB conversion is free on Convertio. Premium users get batch processing and larger file size limits.

Can I include multiple images?

Upload several PNG files and they can be assembled into a single PDB ebook with images on separate pages.

Can PDB be converted to other ebook formats?

Yes — tools like Calibre convert PDB to EPUB, MOBI, or AZW3, letting you migrate content across ebook ecosystems.

PNG to PDB Quality Rating

4.6 (213 votes)
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