How to import your comic collection into an application (step by step guide)

You have decided to switch to a digital tool to manage your comic book collection. Excellent decision. But between the decision and the execution, there is a question that blocks many collectors: how do I transfer what I already have? Whether your collection is in an Excel file, on sheets of paper, or simply in your head, this guide will guide you step by step for a successful migration.

The goal is not just to duplicate your existing list into a new tool. It's about taking advantage of the migration to obtain something radically better: an enriched catalog, with covers, complete metadata, market quotes and automatic detection of missing items. Your old system didn't offer you this.

Before you begin: assess your starting point

The import strategy depends entirely on the current form of your collection. Let's identify your situation among the three most common cases.

Case 1: you have an Excel or Google Sheets file

This is the most favorable situation. You already have a structured list with at least titles and numbers. Your file is your road map: you won't have to dig through your longboxes to find out what you have.

Advantage: you can work screen by screen, without physically touching your comics. Migration is office work, not sorting into boxes.

Case 2: you have a paper list or scattered notes

Some collectors keep a notebook, post-its, notes on their phone. The information exists, but it is not structured. You will first need to consolidate these notes into a single list before starting the import.

Practical tip: photograph all your notes and consolidate them into a single document. Even a plain text file with "Amazing Spider-Man 1-50" is a good place to start.

Case 3: you have no list, it’s all “in your head”

This is the most common situation among collectors who have never cataloged. You know roughly what you have, but no inventory exists. The migration will take longer, but it will also provide the most value: you will finally discover exactly what you have.

In this case, the only reliable method is to proceed physically: open each longbox and save each comic one by one. It's longer, but it's an opportunity to check the condition of each copy and discover forgotten treasures.

Step 1: Prepare your work environment

Before opening the app, organize your space to be efficient:

• If you are migrating from Excel— open your spreadsheet on one screen and the application on the other (or split screen on a single screen). Sort your Excel by series, then by number. This will allow you to process each series in one block.
• If you start from your physical comics— sit near your longboxes with your computer or phone. Take out the comics in stacks of 20-30. Bring “processed” and “to be processed” batteries so you don’t lose track.
• In any case— plan sessions of 30 to 45 minutes maximum. Beyond that, concentration drops and errors increase. It's better to do 6 effective 30-minute sessions than a 3-hour marathon where you make mistakes at the end.

Step 2: Understand the GCD catalog and its role in importing

The fundamental difference between manually typing in a spreadsheet and using a dedicated application is the catalog. My Comics Collection is based on the Grand Comics Database (GCD), one of the world's references in comics cataloging.

Concretely, this means that for each comic you want to add, you do not have to manually enter the title, number, date, authors or cover. You search for the series in the catalog, you select the number, and all the metadata is filled in automatically. Your only job is to confirm the addition and, if you wish, to specify the status of your copy.

What the GCD catalog brings to your import

• Blankets— each issue is associated with its cover image. Your collection becomes visual instantly.
• Complete metadata— screenwriter, designer, inker, colorist, publication date. Information that your Excel probably didn't contain.
• Consistency— more variations in how to write a title ("Amazing Spiderman" vs "Amazing Spider-Man" vs "ASM"). The catalog imposes a single format.
• Missing detection— since the catalog knows all the numbers in a series, the application can immediately identify those you don't have.

Step 3: the series-by-series import method

The most effective strategy is to proceed series by series, not comic by comic in a random manner. Here's why and how.

Why series by series?

When you work on one series at a time, you stay in the same context. You know the numbering, you quickly spot the missing numbers, and the application shows you in real time your progress on this series. Going from Amazing Spider-Man to Batman to Saga with each comic is disorienting and slow.

The concrete procedure

1. Choose a series— start with your largest or longest series. The feeling of accomplishment when seeing a run of 100 numbers appear in the app is a great motivator.
2. Find it in the catalog— type the name of the series in the application's search bar. Select the correct version (be careful of relaunches: “Amazing Spider-Man (1963)” is not “Amazing Spider-Man (2018)”).
3. Add your numbers— go through the list of numbers and check the ones you have. With My Comics Collection, adding is done in one click per issue. For a continuous run (eg: #200 to #300), it's extremely fast.
4. Specify the states— if you know the state of conservation of each copy, add it now. Otherwise, you can do it later. Don't let this step slow down your initial import.
5. Move on to the next series— once the series is finished, take 2 minutes to admire the result (covers, missing items identified, estimated value) then start the next one.

The actual times observed

Here are real benchmarks based on user feedback:

• 100 comics— 45 minutes to 1h30 depending on the number of different series
• 300 comics— 2 to 3 hours, spread over 2 sessions ideally
• 500 comics— 3 to 5 hours, spread over 3-4 sessions
• 1,000+ comics— 6 to 10 hours, spread over a week at a rate of 1-2 sessions per day

These times include adding states and some pauses. If you only enter the titles and numbers without the states, divide these times by two.

Step 4: Clean and enrich during migration

Migration is not a simple copy. This is a unique opportunity to correct accumulated errors and enrich your catalog.

Errors to correct

• Duplicates— your spreadsheet may have contained undetected duplicates. The application identifies them immediately: if you try to add a number that is already present, it alerts you.
• Misspelled titles— “Uncanny Xmen” instead of “Uncanny X-Men”, “Spiderman” instead of “Spider-Man”. The catalog automatically corrects these variations.
• Misidentified numbers— some series have complex numbering (relaunches, volumes, annuals). The catalog helps you assign the right number to the right volume.

Enrichments to make

• Conservation states— if you had not noted the state in your old system, take advantage of the migration to evaluate each comic (NM, VF, FN, VG, etc.).
• Purchase price— if you know them, now is the time to record them. This will later allow you to compare purchase price and current rating.
• Personal notes— “purchased at Paris Comics Expo 2023”, “signing by Jim Lee”, “variant cover”. This information is valuable and worth recording.

Step 5: verify and finalize your import

Once most of your collection has been imported, take the time to check:

1. Count— is the total number of comics in the app roughly what you think you own? A deviation of 5-10% is normal (duplicates removed, numbers forgotten). A 30% discrepancy means you missed boxes.
2. Check the main series— for your 3 or 4 most important series, compare what the application displays with what you know you have. Are the missing numbers identified really missing?
3. Test the valuation— look at the total estimated value. Is it consistent with your intuition? If your collection of 500 comics is valued at 200 euros or 50,000 euros, there is probably a problem that needs to be corrected.

After import: good habits to adopt

Importing is a one-time effort. The next important thing is to keep your catalog up to date. The golden rule:add each new comic at the time of purchase. Not in the evening, not on weekends. The moment you buy it. With a mobile app, it takes 10 seconds. If you let the “to do later” additions pile up, you will fall back into the same pattern as your old abandoned spreadsheet.

Collectors who keep their catalog up to date are those who add their purchases within 5 minutes of acquisition. Those who wait until “this weekend” end up being a month permanently late.