Scan ISBN barcodes

Create your own book database

Automatically catalog your books by scanning ISBNsGet author, title, publisher, genres, subjects & cover art.
Just search our huge online book database ... ... by scanning ISBN barcodes
Over 40 million ISBNs recognizedGuaranteed 97% success rate on your ISBN searches!
CLZ Books icon CLZ Books
Mobile
Mobile app for your phone or tablet
iOS & Android
example
USD $19.95 per year
More about the mobile app
CLZ Books icon CLZ Books
Web
Web-based software for your computer
Windows & macOS
example
USD $39.95 per year
More about the web app
CLZ Books
Mobile + Web
CLZ Books Mobile
1 year
+
CLZ Books Web
1 year
USD $0.00
USD $0.00
save USD $0.00

Or... use them both,
as perfect companions!

Both CLZ Books Mobile and CLZ Books Web can be used on their own, as a stand-alone solution. But these tools really come to life when used together, as they are great companions. While away from your computer use CLZ Books Mobile on your phone, then use CLZ Books Web at home, to work on your database on a big screen, with a real keyboard. Of course, you can sync your database between them through our CLZ Cloud solution.

Latest software updates

Sep 1, 2025
My book catalog story
I love my CLZ book catalog. I had always wanted to catalog my books and back in the days of card catalogs when I was young, I made an index card file (which I still have). I had far fewer books then. Now I have about 3,000, with book cases in almost every room of our house, and it is hard to keep track of them all in my head. So, one of the practical reasons for having a catalog is to record the location of each book by room and bookcase and in some cases even by shelf. I just have to remember, if I move a book, to change the location in the location field of my catalog. I have been able to locate books with my catalog instead of wasting time searching from room to room.
I have the mobile version as well, for several reasons. Sometimes when I’m in a bookstore, I am not sure whether I already bought a certain book or not; I can tell it is a title I would have liked to own, but I can’t remember if I actually bought it. At least twice I bought a book I already had. Now I can check my mobile catalog. When I finish reading a book, it is quicker to enter that on the “read” field on my phone than to remember to record it next time I am on my catalog on the computer. I can also stand in front of a bookcase with my phone and check whether all the books are cataloged and whether the location is correct.
Beyond practical reasons, I just love having my books organized and cataloged for mental clarity and the pleasure of looking at the titles and covers on the screen. I had once thought of making my own database of my book collection, but it wouldn’t have been nearly as sophisticated as the CLZ one and wouldn’t have included photos of the book covers. Some of my large categories, such as art books, children's books, and Christmas books, have beautiful colorful covers which are a pleasure to look through on the CLZ catalog. I used the genre field to make up my own categories, many of which are not actually genres but the subjects that are important to me. I love that the CLZ software keeps track of the numbers in each category, so for example I know that at the moment I have 184 art and design books, 248 architecture and interiors, 169 autobiography/memoirs, 102 tea books, 213 on England, 206 on New England, 235 children’s books, and 175 Christmas. It’s just interesting to me to know this. It’s a picture of my interests.

So far I have cataloged 2300 of my books. I really enjoy working on the catalog, but it takes time and not all of my books are easily accessible. My method is to scan my new books right away with the app on my phone that CLZ provides, then add them into the collection when I have time to sit at the computer. Then I go to the backlog of older books as I have time and add them in. Some of the oldest ones pre-date the ISBN system and take longer to enter manually. I realize it will take a long time until I am completely caught up, but it’s a goal I’m working towards. I have barely begun to catalog the e-books on my Kindle as that is not as high a priority but will eventually include them as well.
I’ve loved books all my life and also enjoy organizing (probably should have been a librarian), so making a catalog with the CLZ software is a great fit for me.
In the years I’ve been involved with the CLZ catalog, the software has consistently and vastly improved. Many of my books are rather obscure, but more and more of them are recognized in the enormous CLZ database and come in with many of the fields populated and with the cover photo. Previously I had to take my own photos of some of the book covers and upload them, and those photos don’t come out perfectly, but now most of the books come in with the cover when I enter the ISBN or can be found on the “search the internet” feature. More and more information about the books is now included, so that my catalog is an amazing resource.
The CLZ company is extremely responsive when I have contacted them with a question. I don’t know how large or small the company is, but I get a personal response to my emails. I feel confident that they will help me with any catalog questions, and I have a very positive view of the company.

I recommend CLZ Books Web and Mobile to anyone who wants to make a beautiful and useful book catalog. You will be able to sit and scroll through your library and remember books you might not have focused on for some time. You will be able to enjoy looking at the covers of the precious books you have collected and be happy you have them. You will feel organized and be able to locate books in your home. You will have fun with your catalog if you’re anything like me! I even told our local branch librarian about CLZ for his own book collection.
Deborah (USA)

Reviews from customers

Jul 26, 2025
Wonderful tool
Just a note to say thanks very much for your wonderful tool. I was able to use it to easily and quickly catalog my mother's collection of scholarly scandinavian books. The cloud feature is wonderful, as I am now able to share the library with universities who are interesed in receiving the books. I had originally planned to use a spreadsheet and photos, uploading it to dropbox, but this is so much better.
Thank you so very much.
Erik Johansson (USA) on CLZ Books Mobile
Jul 25, 2025
Great book cataloging
Love the barcode scanner. Brings up all the info about the book. if you have a big book collection try this app.
Les on CLZ Books Mobile
Jul 21, 2025
So easy to use!
I helping a friend move & she is reducing her considerable library for the first time in 20 years. Over 500 books scanned by CLZ and easily tagged for keep, resell, & donation. So easy to use! The CLZ app makes all of that possible. I like the desktop version for modifying or editing any folders or books but quick fixes.
Amberly Smith on CLZ Books Mobile
Jul 5, 2025
Excellent
A great app to organize your books, especially if you own hundreds of them. The ISBN scan feature works wonderfully and helps to quickly bring in new books. Highly recommended.
Paul Beasley on CLZ Books Mobile
Jun 20, 2025
This app is a game changer!
I was assigned the task of cataloging my father’s library, a retired professor with over 3000 books. I have tried to use other apps and struggled. This app is a game changer and a life saver! It’s so easy to scan multiple items and finds titles quickly, it syncs with my computer, and I was able to create a print out to show my father the list with Book cover images! There is no other app like this one! Thank you for creating this!
RGrant33 (USA) on CLZ Books Mobile
Jun 9, 2025
Powerful inventory app
CLZ Books is a powerful inventory app for serious book collectors, offering customizable cataloging, barcode scanning, and cloud backup. The interface is user-friendly, and customer support from the founder and owner Mr.Alwin is top-notch, though advanced features may require some learning.
Rating: 5/5
Recommended for: Dedicated collectors and libraries.
Nur Yanny Chew (Indonesia) on CLZ Books Mobile
May 25, 2025
A pleasure to document a library!
The clz team is so thoughtful and helpful, if you have any questions they are available! I have quite a large collection, and this app makes it so so so easy to log everything. their database is extensive, and the isbn scanner is magical! im so happy this app exists, I can stop buying doubles (sometimes triples) by searching my collection before I buy a book! its been so cool to see my collection grow!
Cayla Kelton on CLZ Books Mobile
May 8, 2025
Worth every penny
This app is so awesome! It's worth every penny. I have hundreds of books and I got them all scanned. It's very customizable. Couldn't be happier.
K K on CLZ Books Mobile
Apr 14, 2025
Easy to use
Just what I needed. Easy to use. Scan the code and add it to your library.
Phil for apple (USA) on CLZ Books Mobile
Apr 7, 2025
Have used this app for years
Provides so much information and a snap to add books with scan tool. Great support team. Couldn't get by without this software. Great for preventing me buying books I already own.
Brent Phipps (USA) on CLZ Books Mobile
Jan 8, 2025
The Best App For Book Lovers
For years, I have wished there was a way to inventory my book collection so I would always know what I had at home. Going to book stores and trying to remember if I had that title sitting on my shelf at home was a total first world problem, but one I faced nonetheless. I even tried keeping tabs on my ever-growing library of books by keeping a list in my Notes app, but that still didn’t scratch that itch I was looking for.
Then one day, I stumbled upon this app, and I’ve never been happier. The ease of use with the built-in scanner, and the ability to edit book details to fit my current editions has been a dream come true. I use the app daily now, and look forward to doing so for years to come.
The only bad thing: I’m now reminded of how many I have, and how many I still have to read. Uggh, wish me luck.
anod4290 (USA) on CLZ Books Mobile
Nov 27, 2024
Absolutely Love
This app is exactly what I was looking for to catalog my books. I found myself buying duplicates, and decided to go in search of an app that would help me keep track of my books. CLZ Books - library organizer does exactly that and more. I keep books in different rooms in my house, I can note where the books are, mark if I have loaned them out and to who, I can rate them and note when I read them and keep personal notes. It is easy to use, and after initially loading my books, I am able to scan new books easily to add them to the collection. Highly recommend if you have a good amount of books you would like to keep track of.
Booksrox (USA) on CLZ Books Mobile
Nov 22, 2024
Great app!!!
I have a lot of books, and I tend to buy those in a certain genre: biography, history, adventure tales about the sea and exploration. Then, when I go in a bookstore and see an appealing book, I would wonder if I already had it and in an excess of caution would often buy it. I knew that I had some duplicates, and this app was great for helping me figure out what I already have and shouldn’t purchase, so I figure that it pays for itself!
I also love that it lets me note where the books are, so that, if I’m looking for a history of Ireland, I know that it’s in my home office. And scanning the books is super fast and easy! I would give this 10 stars if they were an option! I learned about this app from a bookstore and only wish I’d known about it sooner!
Santanas (USA) on CLZ Books Mobile
Nov 19, 2024
Beste book data base
Al gebruiker vanaf het eerste uur, iets moeilijker bij de start jaren geleden, maar een fantastische manier om je boeken bij te houden.
De meeste van onze boeken zijn oude boeken, 1600-1800 en dat blijft nogal wat werk om alles foutloos in te tikken, of je vind ze niet meer terug, maar toch super, om je collectie op de slaan. Ik ben nu aan ongeveer nr 2000, maar aangezien het veelal meerdere volumes betreft toch al zeker 3000 boeken. Ik ken geen betere manier om alles bij te houden.
Recentere en nieuwe boeken, dat is echt eenvoudig, barcode scannen, pc openen en alles klaar, super toch! Ook alles op je iphone, super om na te kijken op de boekenbeurs wat je al in collectie hebt of niet! Wij zijn daar super tevreden mee, zelfs al vraagt het soms wat werk om de oude boeken te catalogeren.
Ook verplaatsen van collecties, uitprinten, heel veel mogelijkheden.
Met dank aan alle bedenkers en ontwerpers van CLZ !
Magda De Smedt (Belgium) on CLZ Books Mobile
Nov 17, 2024
My books organized
Great way to keep all your books updated and organized. every time I go buy new books I scan them in and get them saved!
Brittany Booth on CLZ Books Mobile
Nov 15, 2024
User-friendly for all age groups
Finding this app at 63 was a blessing. I have an extraordinary library and continue to collect, yet sometimes you find out you already have the book. This app has been helping me keep track of my existing library and when shopping, I pre-scan the book to ensure I don't own it. Thank you.
Sherlocked61 (USA) on CLZ Books Mobile
Nov 3, 2024
Book Lover? A Must Have App
CLZ makes it so easy to track my book collection in one tab, my 2024 Read in another tab,2023, etc. Used for 3 years now, will Always use it. Also saves me from duplicate purchases as the scanner will tell me if a book is already in my collection just by scanning the back cover code.
fuzzy gemma (Canada) on CLZ Books Mobile
Jun 11, 2024
Easy to scan and upload
Started with CLZ on the computer storing all the wife's books in her library, after a few walks back and forth II downloaded mobile app and haven't looked back, easy to scan and upload.
Douglas Berwick (Australia) on CLZ Books Mobile
Mar 16, 2024
The best cataloguing application
This is the best cataloguing application and the mobile version is a god send with the ability to scan ISBN bar code.
Michael Bartlett (USA) on CLZ Books Mobile
Feb 26, 2024
Scanning my books
I love this scanning option. I went through 300 books and less than half an hour.
Julio Jimenez on CLZ Books Mobile
Jan 12, 2024
As advertised
Thank you for allowing me to spin the pie chart at the bottom of the statistics page - 10/10 app, does as advertised, my only suggestion would be to add a more satisfying beep sound when you scan an isbn:)
Repulsive__ (Australia) on CLZ Books Mobile
Sep 11, 2023
A serious time-saver!
It's a working quite well, thank you! I've managed to catalog over 160 books in just under 2 hours of time. With a collection exceeding 1500 books, this app is a serious time-saver! Out of these books so far, I've only found 3 needed a little extra love or manual attention. The barcode scanning is awesome!
Ron J. on CLZ Books Mobile
Jun 21, 2023
Great for keeping track of books
Barcode scanner fantastic. Good online database for manual search.
Update 6/23. Tech help prompt and responsive and App continues to be improved. Took 3 years to enter the thousands of books in our home library. Great having them at our fingertips. Now no second guessing about whether we've bought a book or read it before so, in addition to the unparalleled convenience our having the library on our phones we've saved more than it cost in not doubling up.
Barry Powell on CLZ Books Mobile
May 2, 2023
So easy
Scanning books is so easy! I was using a different app to track the books i own, but was having problems with it properly tracking them. This app is so easy to add and navigate!
Amanda Rosman on CLZ Books Mobile
Apr 25, 2023
Love Bookcollector!
You guys are SO AWSOME!! I LOVE both the app and online, though I am using the app most of the time now. It is wonderful to be able to scan in new boioks and and notes, edit, wherever I am! I am happy to support!
I have been a very satisfied customer for many years. It is so useful and fun! I never fall behind in keeping my new book purchases entered because with the phone app I can do it in 30 seconds or less!
I LOVE being able to scroll through my book library by viewing the covers! While reading a book, I can add personal notes for future reference and to make the book more searchable for me later ( like a note as to who recommended the book to me)
AND whenever I am having a conversation and want to tell someone about a book that is relevant, I quickly do a search of my collection ( on the app), even if I can’t remember the exact title or author, usually a key word is enough to find it.
Would you believe that my personal library is over 4,500 books? I would be overwhelmed without the Bookcollector products. It is so fun to have the info available right at my fingertips on my cellphone! And to know it is safely stored on the cloud. But even if you only have 100 books (or comics or music), I highly recommend CollectorZ. Truly a great value from a wonderful thoughtful supportive company with years of expert development!
Anita O. (USA)
Oct 26, 2022
Does the job
I’ve tried a few cataloguing apps and this combines the best of all of them. Very customisable with fast scanning via your phone’s camera.
When contacted the customer support is super fast and personal.
psmorrison (United Kingdom) on CLZ Books Mobile
Oct 25, 2022
Great program and service
I was using this app to catalog the 4000 books in my collection. After about 1000 bucks I upgraded to an iPhone 14. It turns out that the camera on the iPhone 14 will not properly scan the barcode. I contacted the developer and they immediately got back to me. They kept me informed of the progress of the upgrade. They have subsequently fixed the problem and the app works fine now.
The app itself is particularly useful if you have books published after 1967 - you can just scan the ISBN code. You have to manually enter the name of pre-ISBN books, but usually the database that the app is connected to will have some of the information. You can then incorporate that information into your collection database.
collector of books (USA) on CLZ Books Mobile
Oct 13, 2022
Good
ISBN code scanning works nicely, very helpful.
34zwecke (Germany) on CLZ Books Mobile
Jun 10, 2022
Love the CLZ series of apps
I use this one for my books and the CLZ Games for my modern & retro games. I am happy to pay for premium of both just because the price is so reasonable and the apps are so good. Being able to add items by scanning the barcode with the camera on your phone is just awesome. Love it.
Shane Hurley (Ireland) on CLZ Books Mobile
Apr 28, 2022
Adding books is a breeze
Great app! Easy to use, clearly and cleanly laid out. Adding books is a breeze - just scan the barcode. I really like that my collection information syncs with and is backed up in the cloud. Customer service, on the rare occasions it is needed, is just excellent - I had a question to which the response was (1) polite, (2) really fast, and (3) really well and clearly explained. I am very, very pleased with this app and company.
Sean Alexander on CLZ Books Mobile