OpenRefine does not require internet access to run its basic functions. Once you download and install it, it runs as a small web server on your own computer, and you access that local web server by using your browser. It only requires an internet connection to import data from the web, reconcile data using a web service, or export data to the web.
OpenRefine requires three things on your computer in order to function:
Compatible operating system
OpenRefine is designed to work with Windows, Mac, and Linux operating systems. Our team releases packages for each.
Java Development Kit (JDK) must be installed and configured on your computer to run OpenRefine. The Mac version of OpenRefine includes JDK; new in OpenRefine 3.4, there is also a Windows package with JDK included. To install JDK separately, installation and upgrade instructions are below.
OpenRefine works best on browsers based on Webkit, such as:
- Google Chrome
- Microsoft Edge
We are aware of some minor rendering and performance issues on other browsers such as Firefox. We don't support Internet Explorer. If you are having issues running OpenRefine, see the section on Running.
OpenRefine always has a latest stable release as well as some more recent work available in beta, release candidate, or nightly release versions.
If you are installing for the first time, we recommend the latest stable release.
If you wish to use an extension that is only compatible with an earlier version of OpenRefine, and do not require the latest features, you may find that an older stable version is best for you in our list of releases. Look at later releases to see which security vulnerabilities are being fixed, in order to assess your own risk tolerance for using earlier versions. Look for “final release” versions instead of “beta” or “release candidate” versions.
If you need a recently developed function, and are willing to risk some untested code, you can look at the most recent items in the reverse-chronological list and see what changes appeal to you.
“Beta” and “release candidate” versions may both have unreported bugs and are most suitable for people who are wiling to help us troubleshoot these versions by creating bug reports.
For the absolute latest development updates, see the snapshot releases. These are created with every commit.
Our [latest release is at the time of writing is OpenRefine 3.4](link goes here!), released XXXX XX 2020. The major changes in this version are listed on the [3.4 final release page](link goes here!) with the downloadable packages.
You can find information about all of our releases on the Releases page on Github.
Installing or upgrading
Back up your data
If you are upgrading from an older version of OpenRefine and have projects already on your computer, you should create backups of those projects before you install a new version.
First, locate your workspace directory. Then copy everything you find there and paste it into a folder elsewhere on your computer.
For extra security you can export your existing OpenRefine projects.
Take note of the extensions you have currently installed. They may not be compatible with the upgraded version of OpenRefine. Installations can be installed in two places, so be sure to check both your workspace directory and the existing installation directory.
Install or upgrade Java
Java Development Kit (JDK) is required to run OpenRefine and should be installed first. OpenRefine installation packages for Mac and Windows come bundled with JDK, so you do not need to install it separately if you use those bundles.
There are JDK packages for Mac, Windows, and Linux. We recommend you install the latest “Ready for use” version: at the time of writing, this is JDK 14.0.1.
Download the archive (either a
.tar.gz or a
.zip) to your computer and then extract its contents to a location of your choice. There is no installation process, so you may wish to extract this folder directly into a place where you put program files, or another stable folder.
Once you have Java extracted onto your system, you need to tell your computer where to find it when OpenRefine looks for it.
- On Windows 10, click the Windows start menu button, type
env, and look at the search results. Edit the system environment variables. (If you are using an earlier version of Windows, use the Search or Search programs and files box in the start menu.)
- Click Environment Variables… at the bottom of the Advanced window that appears.
- In the Environment Variables dialog that appears, click New… and create a variable with the key
JAVA_HOME. You can set the variable for only your user account, as in the screenshot below, or set it as a system variable - it will work either way.
- Set the Value to the folder where you installed JDK, in the format
D:\Programs\OpenJDK. You can locate this folder with the Browse directory... button.
Install or upgrade OpenRefine
If you are upgrading an existing OpenRefine installation, you can delete the old program files and install the new files into the same space. Do not overwrite the files as some obsolete files may be left over unnecessarily.
If you have extensions installed, do not delete the
webapp\extensions folder where you installed them. You may wish to install extensions into the workspace directory instead of the program directory. There is no guarantee that extensions will be forward-compatible with new versions of OpenRefine, and we do not maintain extensions.
- Mac via Homebrew
Once you have downloaded the
.zip file, extract it into a folder where you wish to store program files (such as
D:\Program Files\OpenRefine). You can right-click on
refine.bat and pin one of those programs to your Start Menu or create shortcuts for easier access.
Set where data is stored
OpenRefine stores data in two places: program files in the program directory, wherever it is you’ve installed it; and project files in what we call the “workspace directory.” You can access this folder easily from OpenRefine by going to the home screen (at http://127.0.0.1:3333/) and clicking "Browse workspace directory."
By default this is:
Depending on your version of Windows, the data is in one of these directories:
C:\Documents and Settings\(user id)\Local Settings\Application Data\OpenRefine
For older Google Refine releases, replace
You can change this by adding this line to the file
openrefine.l4j.ini and specifying your desired drive and folder path:
If your folder path has spaces, use neutral quotation marks around it:
-Drefine.data_dir="D:\My Desired Folder"
If the folder does not exist, OpenRefine will create it.
OpenRefine does not currently output an error log, but because the OpenRefine console window is always open while OpenRefine runs in your browser, you can copy information from the console if an error occurs.
Increasing memory allocation
OpenRefine relies on having computer memory available to it to work effectively. If you are planning to work with large data sets, you may wish to set up OpenRefine to handle it at the outset. By “large” we generally mean one of the following indicators:
- more than one million rows
- more than one million total cells
- an input file size of more than 50 megabytes (MB)
- more than 50 rows per record in records mode
By default OpenRefine is set to operate with 1 gigabyte (GB) of memory (1024MB). If OpenRefine is running slowly, or you are getting "out of memory" errors (for example,
java.lang.OutOfMemoryError), or generally feel that OpenRefine is slow, you can try allocating more memory.
A good practice is to start with no more than 50% of whatever memory is left over after the estimated usage of your operating system, to leave memory for your browser to run.
All of the settings below use a four-digit number to specify the megabytes (MB) used. The default is usually 1024MB, but the new value doesn't need to be a multiple of 1024.
Dealing with large datasets
If your project is big enough to need more than the default amount of memory, consider turning off "Parse cell text into numbers, dates, ..." on import. It's convenient, but less efficient than explicitly converting any columns that you need as a data type other than the default "string" type.
If you run
openrefine.exe, you will need to edit the
openrefine.l4j.ini file found in the program directory and edit the line
-Xmx1024M defines the amount of memory available in megabytes (actually mebibytes). Change the number “1024” - for example, edit the line to
-Xmx2048M to make 2048MB [2GB] of memory available.
openrefine.exe not running?
Once you increase the memory allocation, you may find that you cannot run
openrefine.exe. In this case, your computer needs a 64-bit version of Java (this is different from Java JDK. Look for the “Windows Offline (64-bit)” download on the Downloads page and install that. Your system must also be set to use the 64-bit version of Java by changing the Java configuration.
On Windows, OpenRefine can also be run by using the file
refine.bat in the program directory. If you start OpenRefine using
refine.bat, the memory available to OpenRefine can be specified either through command line options, or through the
To set the maximum amount of memory on the command line when using
refine.bat, 'cd' to the program directory, then type
refine.bat /m 2048m
where "2048" is the maximum amount of MB that you want OpenRefine to use.
To change the default that
refine.bat uses, edit the
refine.ini line that reads
Note that this file is only read if you use
refine.bat, not openrefine.exe.
Extensions have been created by our contributor community to add functionality or provide convenient shortcuts for common uses of OpenRefine. We list extensions we know about on our downloads page.
Two ways to install extensions
- Into your OpenRefine program folder, so they will only be available to that version/installation of OpenRefine (meaning the extension will not run if you upgrade OpenRefine), or
- Into your workspace, where your projects are stored, so they will be available no matter which version of OpenRefine you’re using.
We provide these options because you may wish to reinstall a given extension manually each time you upgrade OpenRefine, in order to be sure it works properly.
Find the right place to install
If you want to install the extension into the program folder, go to your program directory and then go to
/webapp/extensions (or create it if not does not exist).
If you want to install the extension into your workspace, you can:
- launch OpenRefine and click in the sidebar
- At the bottom of the screen, click
- A file-explorer or finder window will open in your workspace
- Create a new folder called
extensionsinside the workspace if it does not exist.
Install the extension
Some extensions have their own instructions: make sure you read the documentation before you begin installing.
Some extensions may have multiple versions, to match OpenRefine versions, so be sure to choose the right release for your installation. If you have questions about compatibility or want to request or voice your support for an update, use our downloads page to go to the extension’s page and report the issue there.
Generally, the installation process will be:
- Download the extension (usually as a zip file from GitHub)
- Extract the zip contents into the
extensionsdirectory, making sure all the contents go into one folder with the name of the extension
- Start (or restart) OpenRefine.
To confirm that installation was a success, follow the instructions provided by the extension. Each extension will appear in its own way inside the OpenRefine interface: make sure you read the documentation to know where the functionality will appear, such as under specific dropdown menus.