twineconvert

free · in-browser · no upload

C-CDA to HTML
Converter

Drop your C-CDA file. We'll convert it to HTML right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .xml, .cda, .ccda

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a C-CDA from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your HTML the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert C-CDA → HTML

What this conversion is actually for

Patients receive C-CDA files from EHR portals (Epic MyChart, Cerner HealtheLife) when they request a copy of their records — and those XML files are unreadable to humans. The HL7 stylesheet that's supposed to render them often doesn't load (security policies, missing local CSS, browser quirks). Converting to standalone HTML gives the patient a clean, print-friendly view of their own discharge summary, problem list, medications, and allergies.

A real example

Your parent had heart surgery, the hospital sent home a thumb drive with a CCD.xml of the discharge summary. They can't read XML. Drop the file, download the HTML, open it on their computer — they see name, DOB, the section list (Allergies, Medications, Problems), and human-readable text under each.

Troubleshooting

Some sections show '(no content)' even though I know there's data.

C-CDA stores section content in two places: the `<text>` element (human-readable narrative) and the `<entry>` elements (machine-readable structured data). We render the narrative because it's reliably present and human-targeted. If your sections only have entries, you'd need a more sophisticated viewer like the HealthIT.gov reference renderer.

My provider's name and contact info aren't shown.

The patient header we render is intentionally minimal (name, DOB, gender, MRN). Provider/author information lives in the `<author>` and `<custodian>` elements; we omit them to keep the rendered document focused on the patient. To see them, convert to JSON and inspect the surrounding metadata.

Formats involved

About C-CDA and HTML

C-CDA, Consolidated Clinical Document Architecture

C-CDA is the HL7 XML format every U.S. EHR exports for transition-of-care documents — discharge summary, continuity of care document (CCD), referral note, history & physical. Required for ONC certification and Meaningful Use / Promoting Interoperability incentive programs. Templates standardize how to represent allergies, medications, problems, vital signs, lab results across vendors. Files are typically 100KB-2MB of XML; the document is human-readable when rendered with a stylesheet.

How to open

Most browsers render C-CDA inline if the embedded XSL stylesheet loads. EHR portals (Epic MyChart, Cerner HealtheLife) auto-render. Standalone viewers: HealthIT.gov C-CDA Renderer, Lantana CDA Validator. Convert to HTML for portable viewing.

Full C-CDA format guide →
HTML, HyperText Markup Language

HTML is the markup language of the web, every browser displays HTML documents natively. Files contain text plus tags (<h1>, <p>, <a>, etc.) describing structure and links. Modern HTML5 also supports embedded media (audio/video) and complex semantic markup.

How to open

Every web browser. Any text editor for source. Modern editors (VS Code) syntax-highlight HTML.

Full HTML format guide →

Related tools

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FAQ

Common questions

Is this C-CDA → HTML converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert C-CDA to HTML?

Cross-EHR clinical document exchange and patient record sharing. Web pages; structured document interchange; readable archives. The most common reason to convert is compatibility, HTML works in places where C-CDA doesn't, or vice versa.

How do I open a C-CDA file in the first place?

Most browsers render C-CDA inline if the embedded XSL stylesheet loads. EHR portals (Epic MyChart, Cerner HealtheLife) auto-render. Standalone viewers: HealthIT.gov C-CDA Renderer, Lantana CDA Validator. Convert to HTML for portable viewing.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.