Interlibrary Loan (ILL): How to Borrow Books from Any Library for Free
Quick Facts
- 10,000+ libraries worldwide connected through WorldCat for ILL
- Free at most US public libraries — no charge to borrow via ILL
- 1–4 weeks typical delivery time for physical items
Interlibrary Loan — commonly abbreviated ILL — is one of the library world's best-kept secrets. It is a cooperative system that allows any library patron to request materials from virtually any library in the world, not just their local branch. If your library does not own a specific book, journal article, DVD, or research paper, the ILL program will locate it, borrow it on your behalf, and deliver it to your library for free. In 2026, ILL connects over 10,000 library systems through the OCLC WorldShare network, making it arguably the most powerful free research tool available to the public.
1. What Is Interlibrary Loan and How Does It Work?
Interlibrary Loan (ILL) is a library service through which a library borrows materials on behalf of its patrons from another library. The process is coordinated through the OCLC WorldShare Interlibrary Loan management system, which connects over 10,000 library networks worldwide and maintains the WorldCat catalog — the world's largest bibliographic database.
Here is the basic flow of how ILL works:
How ILL Works: The Journey of Your Request
The entire process is transparent to the patron — you simply wait for a notification that your item is ready for pickup. The lending library sets the loan period (usually 2–4 weeks), and you cannot renew the item beyond what the lending library allows.
2. Step-by-Step ILL Request Process
Confirm Your Library Does Not Have the Item
Search your library's online catalog first. If the item is not available (or has a long wait), you may submit an ILL request. Many catalogs include a direct "Request via ILL" link on the item's page.
Log Into Your Library Account
Navigate to the ILL request portal on your library's website. You will need your library card number and PIN. Most systems use ILLiad, RapidILL, or OCLC WorldShare as their ILL platform.
Fill Out the ILL Request Form
Provide as much detail as possible: title, author, ISBN/ISSN, publication year, publisher, and edition. For journal articles, include the article title, journal name, volume, issue, page numbers, and DOI if available. Accurate information speeds up the process significantly.
Your Library Processes the Request
ILL staff search WorldCat to identify libraries that own the item and are willing to lend it. The system automatically sends requests to libraries in a priority queue, typically starting with geographically nearby institutions to minimize shipping time and cost.
Receive a Pickup Notification
When the item arrives at your library, you receive an email or text notification. The item is held for you at the circulation desk, usually for 7–10 days. Physical books are typically marked with an ILL slip showing the lending library's name and the due date.
Pick Up and Return the Item
Check out the item at the circulation desk with your library card. Return it to your library (not the lending library) by the due date. Late fees for ILL items are often higher than regular items, and some libraries may restrict your ILL borrowing if items are returned late.
3. ILL Timeline: How Long Does It Take?
ILL delivery times vary based on the type of material, the distance from the lending library, and processing speed. Here is a realistic timeline breakdown:
| Item Type | Typical Wait Time | Rush Option | Notes |
|---|---|---|---|
| Journal article (PDF scan) | 1–3 days | Same day (via RapidILL) | Emailed directly to patron |
| Book (nearby library, same state) | 3–7 days | 2–3 days if expedited shipping | Most common ILL scenario |
| Book (out-of-state library) | 1–3 weeks | Expedited at some academic libraries | Standard US library mail or courier |
| DVD / AV media | 1–3 weeks | Not typically available | Some libraries restrict AV lending |
| Rare book / special collection | 2–6 weeks | Not available | May require in-person use only |
| International ILL | 4–8 weeks | Expedited air courier (fee applies) | IFLA vouchers used for payment |
4. WorldCat: The Network Behind ILL
WorldCat is the world's largest library catalog, maintained by OCLC (Online Computer Library Center). As of 2026, it contains records for over 500 million unique items held by more than 10,000 library systems in over 100 countries, representing a combined total of approximately 2 billion individual holdings.
WorldCat by the Numbers
You can search WorldCat directly at worldcat.org to see which libraries hold any item before submitting your ILL request. The WorldCat search also shows the closest library to you that holds the item, which is useful if you want to visit in person instead of waiting for ILL delivery.
5. Free vs Fee ILL by Library System
Most US public libraries offer ILL at no charge to cardholders. Academic libraries vary significantly, with many charging processing fees. Here is a representative sample:
| Library System | Type | ILL Fee | Rush Fee |
|---|---|---|---|
| New York Public Library | Public | Free | N/A |
| Chicago Public Library | Public | Free | N/A |
| Los Angeles Public Library | Public | Free | N/A |
| Harvard University Library | Academic | Free (students/faculty) | Free (RapidILL) |
| University of Michigan | Academic | Free (students/faculty) | Free |
| Community college libraries | Academic | $0–$10/item | $15–$25 |
6. Academic vs Public Library ILL: Key Differences
Public Library ILL
- Free for all cardholders
- Focus on popular books, DVDs, audiobooks
- Longer loan periods (2–4 weeks)
- Simpler request process
- Slower processing (often 1–3 weeks)
- Fewer specialized academic journals
- Staff process requests (less patron control)
Academic Library ILL
- Free for enrolled students and faculty
- Specializes in journal articles, dissertations, research papers
- Faster digital article delivery (1–3 days via RapidILL)
- Access to rare academic materials
- Rush processing often available
- ILLiad self-service tracking portals
- Patrons can initiate requests directly in catalog
7. What Can and Cannot Be Borrowed via ILL
Can Be Borrowed via ILL
- Physical books (including textbooks)
- Journal article photocopies (PDF scans)
- DVDs and Blu-rays (most libraries)
- CDs and music recordings
- Microfilm and microfiche copies
- Dissertations and theses
- Government documents
- Maps (reproductions)
Cannot Be Borrowed via ILL
- E-book files (DRM prevents ILL)
- New bestsellers (within ~1 year of publication)
- Reference books (encyclopedias, dictionaries)
- Rare/fragile special collection items
- Periodicals (current issues)
- Items from your own library system
- Items that only exist in a single library
8. Digital ILL: OverDrive ILL & PDFs
Digital ILL has expanded significantly since 2020, enabling faster delivery of electronic content without physical shipping:
Journal Article PDFs
The most common form of digital ILL. When you request a journal article, the lending library scans the physical journal and emails you a PDF copy. This typically takes 1–3 days and is delivered directly to your inbox. RapidILL, a rapid article delivery system, can fulfill many requests the same day.
OverDrive / Libby ILL
OverDrive's Advantage program allows libraries to share e-book licenses with neighboring library systems. While not traditional ILL, if your library system has a reciprocal agreement with another system in your region, you may be able to borrow e-books from that system directly through the Libby app. This is determined by your library system's consortium agreements.
Controlled Digital Lending (CDL)
Some libraries participate in Controlled Digital Lending programs, where a scanned digital copy of a physical book can be lent for the same period as the physical item. The legal landscape for CDL remains evolving in 2026 following court cases, but it represents the future of digital ILL for monographs.
9. Renewal Options & International ILL
Renewing ILL Items
Renewing an ILL item is possible but not guaranteed — the decision rests with the lending library. To request a renewal: log into your library account, find the ILL item, and click "Renew" or contact your library's ILL department at least 3–5 days before the due date. If the lending library approves, your loan period is typically extended by 2–4 additional weeks. Renewals are usually free at public libraries.
International ILL
International ILL is available through the IFLA (International Federation of Library Associations) Voucher Scheme and direct bilateral agreements between national library systems. The British Library Document Supply Centre (BLDSC) in the UK and the Library of Congress in the US are major international ILL hubs. International ILL typically takes 4–8 weeks and may involve a fee of $10–$30 depending on the libraries involved.
Researcher Tip: If you need a foreign-language book or an out-of-print title that seems impossible to find, start your ILL request anyway. Library ILL staff are skilled researchers who sometimes locate items through channels not visible to patrons. Even items that appear to be unavailable often surface through the OCLC network.
Explore More Library Resources
Verified Info: ILL policies and timelines verified with public and academic library ILL departments. Last confirmed: March 2026
Frequently Asked Questions About Interlibrary Loan
What is an interlibrary loan (ILL)?
An interlibrary loan (ILL) is a service that allows library patrons to borrow books, articles, DVDs, and other materials from libraries outside their own system. If your local library does not own a specific item, the ILL department requests it from another participating library on your behalf, typically at no cost to you.
How long does an interlibrary loan take?
Most interlibrary loans take 1 to 4 weeks to arrive. Photocopied journal articles and digital PDFs typically arrive within 1 to 3 days. Physical books from nearby libraries may arrive in 3 to 7 days. International ILL requests can take 4 to 8 weeks. Rush processing is available at many academic libraries for an additional fee.
Is interlibrary loan free?
Interlibrary loan is free at most public libraries in the United States. Some academic libraries charge a modest processing fee of $5 to $25 for ILL requests, particularly for rush service or international loans. There is never a charge for the item itself — only occasionally for processing or shipping.
What cannot be borrowed through interlibrary loan?
Items typically not available through ILL include: entire e-book files (DRM restrictions), new bestsellers within the first year of publication, reference materials (encyclopedias, dictionaries), rare or fragile special collections items, and items already on long waiting lists at the lending library.
How many libraries are connected through WorldCat for ILL?
WorldCat, maintained by OCLC, connects over 10,000 library systems worldwide with a combined catalog of more than 500 million items (2 billion individual holdings). This is the primary network used for international interlibrary loan, covering libraries in more than 100 countries.