How to Solve GEDmatch Ancestry DNA Upload Error: Step by Step

GEDmatch is a powerful genetic genealogy platform that allows users to upload raw DNA data from various testing companies and compare results across databases. Many individuals choose to upload their raw data from AncestryDNA to GEDmatch in order to access additional analytical tools, explore deeper match comparisons, and gain new insights into their family history. However, during the upload process, users sometimes encounter errors that prevent their DNA file from being accepted or processed correctly.

An Ancestry DNA upload error on GEDmatch can be frustrating, especially when you are eager to explore new genetic connections. Fortunately, most upload problems are caused by manageable technical issues, formatting conflicts, or file handling mistakes. Understanding the root causes and applying the correct troubleshooting steps can help you successfully upload your DNA data and begin your analysis without delay.

This guide explains common reasons for GEDmatch Ancestry DNA upload errors and provides practical solutions to resolve them efficiently.

Understanding the GEDmatch Upload Process

Before troubleshooting an error, it is important to understand how the GEDmatch upload process works. GEDmatch requires a raw DNA data file downloaded directly from AncestryDNA. This file typically comes in a compressed zip format. GEDmatch reads the raw genetic data and converts it into a compatible format for its comparison tools.

During upload, the system checks the file structure, formatting, size, and completeness. If any part of the file does not meet GEDmatch requirements, an error message may appear. Identifying whether the issue is related to file type, formatting, corruption, or system conflicts will help you fix the problem more quickly.

Confirm You Downloaded the Correct File

One of the most common causes of upload errors is using the wrong file. GEDmatch requires the original raw DNA data file from AncestryDNA.

Ensure that you downloaded the raw data file directly from your AncestryDNA account. Do not attempt to upload reports, screenshots, summary documents, or extracted spreadsheet versions. Only the official raw DNA data file is accepted.

If you are unsure, return to your AncestryDNA account and download a fresh copy of the raw DNA file to ensure accuracy.

Do Not Unzip the File

GEDmatch typically requires the original zip file format provided by AncestryDNA. Many users mistakenly unzip the file before uploading it, which can cause compatibility errors.

If you extracted the file contents, delete the extracted folder and use the original zip file instead. Upload the compressed file exactly as downloaded. Avoid modifying the file name or contents, as changes can trigger validation errors.

Check for File Corruption

File corruption may occur if the download was interrupted or incomplete. Corrupted files cannot be processed by GEDmatch.

To resolve this, delete the current file and download the raw DNA data again from AncestryDNA. Ensure you have a stable internet connection during the download process. After downloading, verify that the file size matches what is expected and that the file opens properly as a zip archive without errors.

Using a freshly downloaded file often resolves upload failures caused by corruption.

Verify File Size Requirements

GEDmatch has file size limits and formatting standards. If the file is unusually small or incomplete, it may indicate a download problem.

Check the file size and compare it to typical AncestryDNA raw data file sizes. If the file appears significantly smaller than expected, re-download it. Avoid compressing the file further or altering its structure, as this may interfere with GEDmatch’s upload validation system.

Clear Browser Cache and Cookies

Sometimes upload errors are not caused by the file itself but by browser-related conflicts. Cached data and cookies may interfere with file transfer processes.

Clear your browser cache and cookies, close the browser, and reopen it. Then log back into GEDmatch and attempt the upload again. This refreshes your session and removes outdated data that may be causing conflicts.

Use a Compatible and Updated Browser

Browser compatibility plays a significant role in successful file uploads. Outdated browsers may struggle to handle large file transfers or secure upload protocols.

Use an updated version of Google Chrome, Mozilla Firefox, Microsoft Edge, or Safari. If you experience repeated errors in one browser, try uploading the file using a different browser to determine whether the issue is browser-specific.

Keeping your browser updated improves stability and reduces upload errors.

Disable Browser Extensions

Certain browser extensions, particularly ad blockers, script blockers, or strict privacy tools, may interfere with file uploads.

Temporarily disable all browser extensions and attempt the upload again. If the upload succeeds, enable extensions one at a time to identify which one caused the conflict. Configure that extension to allow GEDmatch operations.

This step often resolves unexplained upload interruptions.

Ensure Stable Internet Connection

Uploading DNA data files requires a consistent and stable internet connection. If your connection drops or slows significantly during upload, the process may fail.

Use a reliable network when uploading large files. Avoid public Wi-Fi networks with limited bandwidth or unstable connections. If possible, use a wired connection for added stability.

If the upload fails midway, restart the process after confirming your internet connection is stable.

Check for Duplicate Kit Submissions

GEDmatch does not allow duplicate kit uploads under the same account. If you attempt to upload the same AncestryDNA file multiple times, the system may display an error.

Check your account dashboard to see if the kit has already been uploaded. If the kit is listed but not fully processed, wait for processing to complete rather than uploading again.

Avoid repeated submissions, as they can create confusion and delay processing.

Allow Processing Time

After a successful upload, GEDmatch requires time to process the DNA file before it becomes available for comparisons. During this period, tools may not recognize the kit.

If you receive a message indicating that processing is underway, wait until the system confirms completion. Avoid re-uploading the file during processing.

Patience during this stage prevents unnecessary errors and duplicate attempts.

Contact GEDmatch Support

If all troubleshooting steps fail and upload errors persist, contacting GEDmatch support is recommended. Provide detailed information to help them diagnose the issue, including:

Your GEDmatch username
The exact error message received
The browser and device used
Confirmation that the file is the original AncestryDNA zip file
Approximate time of upload attempt

Providing clear details helps support staff identify whether the issue is account-specific, file-related, or system-wide.

Maintain Backup Copies

To prevent future issues, store a secure backup copy of your AncestryDNA raw data file. Keep it in a safe digital location, such as an encrypted drive or secure cloud storage.

Having a backup ensures that you can quickly retry the upload if needed without downloading the file repeatedly.

Final Thoughts

Solving a GEDmatch Ancestry DNA upload error requires careful attention to file integrity, browser compatibility, and stable internet connectivity. Most issues stem from uploading the wrong file type, unzipping the file prematurely, file corruption, browser conflicts, or network instability. By downloading a fresh copy of the original raw DNA zip file, avoiding modifications, clearing browser cache, updating your browser, disabling interfering extensions, ensuring a reliable internet connection, and allowing sufficient processing time, users can successfully complete the upload process. If problems persist, contacting GEDmatch support with detailed information will help resolve the issue efficiently. With the right approach, uploading your AncestryDNA data to GEDmatch can be a smooth and successful step toward deeper genetic research and expanded family discovery.