Convert C4 to PDF Online for Free

C4 File to PDF Converter

Convert supported C4 files to PDF directly in your browser

No Upload Instant Mobile PDF Export

Drop your C4 file here

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.c4 files only — Max 50 MB

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PDF Settings

Page Size A4 A3 Letter Legal

Orientation Portrait Landscape

Margins Normal (20mm) Narrow (10mm) Wide (30mm)

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1 page 0 KB A4 Portrait

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This C4 file format is not supported for browser-based conversion.

The uploaded .c4 file appears to be a binary or proprietary format that cannot be reliably decoded in a web browser.

.c4 is used by several different applications (C4 architecture models, ClarisWorks/AppleWorks documents, game data files, and others). This tool can convert text-based C4 files (such as C4 architecture model descriptions) to PDF. For binary .c4 formats, please use the original desktop application that created the file and export to PDF from there.

What you can do:

• If this is a C4 architecture model file, make sure it is saved as plain text (not a proprietary binary export).
• If this is a ClarisWorks/AppleWorks document, open it in AppleWorks or a compatible viewer and use its built-in PDF export.
• If this is a game or proprietary data file, use the associated application to convert it first.
• You can also try re-saving the file as plain text (.txt) in its native application, then use this tool to convert that text to PDF.

How To Convert a C4 File to PDF

1

Upload Your C4 File

Drag and drop or click to select your .c4 file from your device.

2

Format Validation

The tool analyzes the file to determine if it is a supported text-based C4 format.

3

Preview Content

If the format is supported, the decoded content is displayed for your review.

4

Choose PDF Settings

Select page size (A4, A3, Letter, Legal), orientation, and margin preferences.

5

Convert to PDF

Click the convert button to generate a professional PDF document from your C4 content.

6

Download PDF

Download the generated PDF file to your device. No watermarks, no limits.

Frequently Asked Questions

A .c4 file extension is used by multiple different applications. The most common in software development is the C4 architecture model file — a plain text file describing software system architecture using the C4 model framework by Simon Brown. However, .c4 is also used by ClarisWorks/AppleWorks (proprietary document format), various games, and other niche applications. This tool handles text-based C4 files.

Yes, this tool is completely free with no usage limits, no watermarks, no sign-up required, and no hidden fees. You can convert as many supported C4 files as you need.

No. This tool runs entirely in your web browser. It works on Chrome, Firefox, Safari, and Edge without any plugins, extensions, or desktop software installations.

This tool supports text-based C4 files, including C4 architecture model descriptions (plain text, PlantUML-style syntax, Structurizr DSL exports, and similar text representations). Binary .c4 formats (such as ClarisWorks/AppleWorks documents or game data files) are not supported because they require proprietary decoders that cannot run in a browser. The tool will clearly inform you if your file format is unsupported.

The tool reads the file's binary content and checks whether it consists of valid text characters (UTF-8 decodable, no excessive null bytes or non-printable characters). If the content is valid text, it is treated as a supported text-based C4 file. If the content contains binary data, the tool reports it as an unsupported format and explains why conversion cannot proceed.

Unfortunately, no. ClarisWorks/AppleWorks .c4 files use a proprietary binary format that requires the original application or a specialized desktop converter. To get a PDF from such a file, open it in AppleWorks (or an emulator), ClarisWorks, or a compatible viewer like ECopy or LibreOffice with legacy filters, then use that application's PDF export function.

For supported text-based C4 files, the tool reads the text content, formats it with proper monospace typography, adds a header with the filename and timestamp, handles page breaks automatically based on your chosen page size and margins, and generates a PDF using the jsPDF library — all within your browser.

You can choose from four page sizes (A4, A3, Letter, Legal), two orientations (Portrait and Landscape), and three margin presets (Narrow at 10mm, Normal at 20mm, and Wide at 30mm). These settings affect how the C4 content is laid out across PDF pages.

The PDF renders the text content using monospace font to preserve the structure and indentation of your C4 file. However, since text-based C4 files are plain text (no fonts, colors, or embedded images), the PDF will reflect the text content accurately but will not reproduce visual elements that were never part of the text file itself.

All modern browsers with JavaScript support: Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge, and Opera. The tool uses standard Web APIs (FileReader, Blob, Canvas) and the jsPDF library, which are widely supported.

Yes. The interface is fully responsive with full-width buttons and stacked layouts on small screens. You can upload C4 files, preview content, configure settings, and download the generated PDF on both iPhone (Safari) and Android (Chrome) devices.

No. All file reading, content parsing, and PDF generation happen entirely in your browser. Your files are never uploaded, transmitted, or stored on any server. The tool continues to work even if you disconnect from the internet after the page loads.

Absolutely. Since all processing is local, there is zero risk of data interception, leakage, or unauthorized access. No one — including the tool developer — has any access to your file content at any time.

The tool will display a clear warning message explaining that your specific .c4 file cannot be converted in-browser, along with guidance on what you can do next. It will never pretend to convert an unsupported file or simply rename the extension — that would be misleading and unhelpful.

Binary C4 formats (like ClarisWorks) require proprietary decoders whose specifications are not publicly available or are legally restricted. Implementing such decoders in JavaScript for browser use is not feasible. We focus on providing reliable conversion for the text-based C4 formats that can be accurately processed client-side.

Privacy Guaranteed: All C4 file parsing and PDF generation are performed entirely in your browser. Files are never uploaded, stored, or transmitted to any server.

Convert supported C4 files to PDF directly in your browser — private, responsive, and 100% client-side.