How to Read ACM Papers for Free, Legally
The ACM Digital Library went open access in 2026. What that means, what to do when a paper still asks you to pay, and the free routes that always work.
The ACM Digital Library holds most of the important conference proceedings and journals in computer science, from SIGGRAPH and CHI to the Communications of the ACM. For years a large part of it sat behind a paywall. That changed on 1 January 2026, when ACM made its whole corpus open access, but readers still run into pages that ask them to pay or log in. Here is what the change means and the legal routes that work if you hit a wall.
1. Start with the Digital Library itself
As of January 2026, ACM says that all of its publications in the Digital Library are open access to read, under what it calls the Basic edition. A paid Premium edition adds analysis tools for institutions, but reading and downloading the papers no longer needs a subscription. So the first thing to try is simply the PDF button on the article's page at dl.acm.org.
If that works, you are done. If it does not, you may be looking at a cached or mirrored page, an article from a partner publisher that ACM distributes rather than publishes, or a temporary problem. The routes below cover those cases, and they also cover anyone who prefers a copy outside the Digital Library.
2. Look for a free copy in a repository
ACM authors have long kept the right to post the accepted version of their paper, the peer-reviewed text before ACM's typesetting, on their own website and in their university's repository. Computer scientists do this more than most, so a free copy on an author's home page is common. Paste the DOI, the dl.acm.org link or the title into the finder on our home page and it checks the open-access indexes for these copies. Our guide to the kinds of open access explains how the versions differ.
3. Check arXiv
Most computer science papers now appear on arXiv before or around the time of the conference. The arXiv version is often updated to match the final paper, and it is free to everyone from the day it is posted. The finder lists arXiv copies alongside the rest; if you want to search arXiv directly, see what arXiv is and how to use it. Bear in mind that a preprint can differ from the published version, as preprints and published papers explains.
4. Follow an Author-Izer link
ACM runs a service called Author-Izer. An author can generate a special link to their paper and post it on their own web page or in their institutional repository, and anyone who clicks that link gets the definitive version from the Digital Library free of charge. Since the move to open access this matters less, but the links are still everywhere on researchers' publication pages, and they always work. If an author's page lists a paper with an "ACM DL" link, try it.
5. Use the conference's OpenTOC page
Many ACM special interest groups post an open table of contents, known as an OpenTOC, for each conference they sponsor. It is a page on the conference or SIG website listing every paper in the proceedings with free full-text links into the Digital Library. SIGCOMM, SIGSOFT and others keep these pages going back years. Search for the conference name and "OpenTOC", or look for a "Proceedings" link on the conference site.
6. Ask the author
Researchers are allowed to send a copy of their own paper to someone who asks, and computer scientists usually reply quickly. Our guide has a template for emailing an author. Every paper page on this site includes a ready-written request if the finder comes up empty.
7. Use a library or an ACM membership
University libraries that subscribe to the Digital Library give you the Premium features as well as the papers, and a public library may be able to get a paper for you by inter-library loan. See getting papers through a library. ACM membership also includes Digital Library access, and student membership is inexpensive, though with reading now free the main reasons to join are the other benefits.
A note on older papers
ACM's open access covers its back catalogue as well as new papers, so a paper from the 1980s should be as free as one from this year. If an old paper's PDF button fails, it is usually because the scanned file is large or the page has not finished loading. The repository and arXiv routes above are the fallback.
The other computing publisher
ACM and IEEE between them publish most of computer science. IEEE has not made the same move, so for an IEEE paper see our separate guide to reading IEEE papers for free.
Find a free copy of a paper
Paste a DOI, a link to the paper or its title, and we will look for a free, legal copy. No signup.
Frequently asked questions
Is the ACM Digital Library free now?
Yes. From 1 January 2026 ACM made all of its publications in the Digital Library open access to read. A paid Premium edition exists for institutions, but it adds tools rather than access to the papers.
What is an ACM Author-Izer link?
It is a link an author creates and posts on their own website or in their institutional repository. Anyone who clicks it gets the final published version of the paper from the ACM Digital Library free of charge.
Can ACM authors post their papers on arXiv?
Yes. ACM authors keep the right to post the submitted and accepted versions of their papers on arXiv, on their own website and in their institutional repository, and most computer scientists do.