Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your DCX images to PNG8 format. This tool works for both professionals and casual users. Convert your images to PNG8 in seconds.
DCX (Multi-page PCX)
A legacy multi-page image format created for PC-based fax software.
DCX is a multi-page bitmap image format that essentially acts as a container for multiple PCX files. It was developed by ZSoft Corporation, the same company that created PC Paintrush and the PCX format. The primary purpose of DCX was to serve as the file format for early digital fax software, allowing a multi-page document to be stored in a single computer file. Technically, a DCX file begins with a header containing a list of offsets (pointers) to the individual PCX images stored within the file. Each 'page' is a fully valid PCX image with its own header and palette. The format relies on the simple RLE (Run-Length Encoding) compression inherited from PCX, which is efficient for simple black-and-white fax documents but poor for complex photographs.
A DCX file consists of a 4-byte signature (987654320) followed by an array of up to 1024 32-bit integer offsets. Each offset points to the start of a PCX image structure within the file. The list ends with a zero (null) terminator. Because it is wrappers around PCX, it shares all the characteristics of that format: support from 1-bit monochrome up to 24-bit RGB color. However, since it was primarily used for faxing, the vast majority of DCX files encountered today are 1-bit black and white.
DCX became popular in the early 1990s alongside the rise of fax modems and software like WinFax. It allowed users to scan or 'print' a document to a fax driver, which would save the pages as a linear .dcx file before transmission. As PDF became the dominant document format and email replaced faxing, DCX faded into obsolescence.
PNG-8 (8-bit Indexed)
The lightweight champion for simple graphics, offering GIF-like sizes with PNG quality.
PNG-8 is a specific variant of the PNG format that uses an 8-bit indexed color palette, limiting the image to a maximum of 256 colors. This is the same color technique used by GIF, but PNG-8 uses the superior DEFLATE compression algorithm, resulting in files that are typically even smaller than GIFs. PNG-8 is the secret weapon of web optimization. For logos, icons, and simple illustrations that don't need millions of colors, converting a standard 24-bit PNG to PNG-8 can reduce file size by 60-80% with virtually no visual difference. It supports transparency, usually in binary form (like GIF), though some modern tools can create PNG-8 files with full alpha transparency.
In a PNG-8 file, each pixel is represented by a single byte (8 bits) which acts as an index into a palette (PLTE chunk) of up to 256 RGB colors. This is much more efficient than storing the full 3-byte RGB value for every pixel. Transparency in PNG-8 is typically handled by the `tRNS` chunk, which specifies a single color index as transparent (binary transparency). However, the PNG specification allows the `tRNS` chunk to contain alpha values for palette entries, enabling semi-transparency. Tools like `pngquant` exploit this to create 'Alpha PNG-8' files that have both small size and smooth transparency, though very old browsers (IE6) struggled with this.
PNG-8 has been part of the PNG specification since version 1.0 (1996). It was designed to replace GIF, offering better compression and being patent-free. However, due to Internet Explorer 6's poor support for alpha transparency in PNGs, PNG-8 (with binary transparency) was often used as a fallback for years. Today, with modern tools like TinyPNG and pngquant, PNG-8 has seen a resurgence as an optimization target, allowing developers to serve crisp graphics at tiny file sizes.
Experience lightning-fast image conversions with our advanced algorithms. No more waiting for your files to be uploaded before processing.
Enjoy unlimited image conversions without any hidden fees. Our service is completely free to use, with no limitations on file size or quantity.
Convert images files between over 20 formats. We support popular formats like PNG, JPG, WebP, HEIC and more.
Use Dynapik on any device with a modern browser. We support all major platforms such as Windows, macOS, Linux, Android, and iOS.
Ensure high fidelity in your conversions. Our professional-grade output is ideal for designers, marketers, and content creators.
Your files are safe with us. We focus on your privacy and security with advanced encryption and local processing.