Exporting your comic collection involves transforming your inventory (issues, publishers, status, certifications) into a reusable file — most often a CSV/Excel for sorting and calculation, a PDF for insurance or inheritance, and possibly a JSON for migrating to another tool. The bottom line: include series, number, publisher, year, state or grade, CGC certification number if applicable, price and date of purchase, then keep an out-of-home (cloud) copy in addition to the local copy.
A growing comic book collection always ends up asking the same question: where is all this written? For years, many collectors made do with an impressive RAM and a stack of cardboard binders. Then comes the day when you have to prove what you own — for insurance after water damage, to sell a lot at once, to pass on a collection to a child who has never opened a long box in his life, or simply to change your phone without losing six years of seizure. This is where exporting your collection ceases to be an administrative detail and becomes a necessity.
Exporting, in this context, does not mean “taking a screenshot of your app”. This means producing a structured file, readable by a spreadsheet, an insurer or third-party software, which describes each issue with consistent fields: series title, issue number, publisher, year of publication, state or grade, possibly certification number if the comic is under cover. This file becomes the backbone of everything that follows — sales, insurance, inheritance, tool migration — because it transforms a dispersed physical collection into data that can be sorted, filtered, added and transmitted as an attachment.
This guide details what you really need to put in an export, which formats to favor depending on usage, what insurers actually require, and how to check that the data you export — in particular the CGC certification numbers — corresponds to reality before freezing them in a document that will serve as a reference for years.
From paper inventory to database: a brief history of comic book cataloging
Before we talked about CSV files, comic book collectors kept lists by hand — a notebook, bristol cards, sometimes a simple address book used to note title, number and date of purchase. This approach worked as long as the collection remained small, but it made any serious estimate impossible: without a common reference, everyone estimated their numbers instinctively.
The turning point came in November 1970, when Robert M. Overstreet published the first edition of hisComic Book Price Guide: a work of 218 pages, printed in 1000 copies (later supplemented by 800 more), sold for 5 dollars and bound in saddle stitching. For the first time, collectors have a structured list with value ranges by title and number. The very principle of “cataloguing” a collection – associating each number with an identifier, a state and a reference value – comes from there, and it still structures the way we think about exporting a collection today.
The switch to digital followed twenty-four years later. In March 1994, three enthusiasts — Tim Stroup, Bob Klein and Jonathan E. Ingersoll — founded the Grand Comics Database (GCD) with the stated objective of listing “all the comics ever published.” Having become a registered non-profit association in Arkansas, in 2025 the GCD exceeded 2.1 million issues indexed, 4.3 million stories listed and 95,000 creators credited. This is the first time that a comic book catalog exists in the form of a searchable database rather than a printed book — and therefore, the first time that data can be extracted from it rather than copied by hand.
The third milestone concerns certification more than actual cataloging: the founding of Certified Guaranty Company (CGC) in 2000, which introduced an objective and standardized rating of the condition of comics, with a unique certification number assigned to each graded copy. More than 20 million collectibles have been certified by CGC since its creation. This certification number becomes, for graded comics, an identifier as central as the title and issue number themselves — and an essential field of any serious collectible export.
These three developments – the printed reference price, the searchable database, the unique certification number – explain why a modern collection export is no longer limited to “title + number”. It inherits a data structure built over several decades, where each field responds to a specific need: identify, locate in time, evaluate, authenticate.
Why export your collection: real use cases
The most common reason for exporting your collection remains pure and simple backup. A collection captured only in an app installed on a single device is a collection at a single point of failure: phone lost, broken, stolen, or simply replaced without data migration, and years of capture disappear. Regular export to a standalone file — stored locally and in the cloud — eliminates this risk.
The second use case is domestic disasters. Fire, water damage, burglary: in these situations, the physical collection itself can be damaged or disappear, and this is precisely the moment when having a dated, complete export stored elsewhere than at home makes all the difference in asserting an insurance claim.
Third case, selling in batches. A serious buyer — whether an individual or a professional — almost always requests a list before traveling or making an offer. A clean export, sorted by series and by condition, avoids back and forth and speeds up the negotiation: the buyer can quantify his offer without having to inventory everything himself.
Fourth case, transmission. A collection accumulated over fifteen or twenty years often represents a value that the heirs do not know how to assess, or sometimes even identify. An up-to-date export, with certification information and value estimates, turns a stack of boxes into a documented asset and significantly facilitates the work of a notary or auctioneer in the event of an inheritance.
Last case, more technical: migration between tools. Whether it is to change management applications, move from a homemade spreadsheet to a dedicated tool, or simply rebuild your database after a reinstallation, a complete and structured export is the only way to not lose anything in the process.
The essential data to include in an export
A collection export only has value if the fields it contains make it possible to find, without ambiguity, each number and its state. Five blocks of information come back systematically.
Number identification
Series or exact title, issue number (including extensions such as A, B or Annual), publisher, year and month of publication if known, and if applicable the variant cover. This identification must be sufficiently precise to distinguish a reissue from a first printing, which has a direct impact on the value.
Status and certification
For an ungraded comic, the estimated condition (raw, with a descriptive grade rather than an invented number if no official grading has been made). For a sealed comic, the grade assigned and especially the certification number, which must be copied exactly as it appears on the label — a poorly transcribed number makes verification impossible.
Origin
Date of purchase, price paid and, if possible, the source of acquisition (convention, auction, online purchase). This information is used both for insurance and to calculate a capital gain or loss in the event of resale.
Visual
A double-sided photo of the cover, and for graded copies, a photo of the complete label showing the certification number and color of the label. In the event of a dispute or disaster, these images are often worth more than a textual description.
Valuation
The estimated value must always be linked to its calculation method and its date — an estimate based on recent real sales only makes sense if we know when it was made, because the price of a comic evolves.
The mycomicscollection application allows you to fill in most of these fields as you add issues to your collection, which avoids having to reconstruct everything when exporting — seethe comics collection applicationfor the entered part.
Export formats: CSV, PDF, JSON, and the case of GCD
The choice of format depends almost entirely on what you plan to do with the file once exported.
The CSV format (or its equivalent Excel/.xlsx) remains the most universal. Any data organized in columns — series, number, publisher, status, price — lends itself naturally to this, and any spreadsheet opens it without configuration. This is the preferred format for sorting, filtering, making sums or sorting by publisher, and it is also the easiest format to transmit to a buyer or to re-import into another management tool.
PDF, on the other hand, is not made to be manipulated but to be read and archived as is. This is the format suitable for an insurance file or an inheritance document: it freezes a dated version of the inventory, with a stable layout, without depending on particular software to be opened in ten years.
The JSON format, more technical, is mainly used for migration between applications: it preserves the hierarchy of data (for example several photos or several notes attached to the same number) which the spreadsheet format, purely in rows and columns, tends to flatten.
A special case deserves to be mentioned: the Grand Comics Database offers its own data exports, in .gcd format — a tab-separated text file that opens directly in Excel — as well as complete extractions of its database published approximately every two weeks in the form of a compressed MySQL dump, the whole being distributed under the Creative Commons BY-SA 4.0 license. The GCD is not a personal collection management tool: it is an encyclopedic reference base, constructed collectively, which lists the editorial information of each issue (creators, publication date, publisher). It is especially useful before a personal export, to check that a title, a number or a date that you are about to freeze in your own file is indeed accurate — rather than as a destination for your export.
Exporting for insurance: what insurers really ask for
A valuable comic book collection is almost never automatically covered by standard home insurance beyond an often low limit for collectibles. To be truly covered, it generally requires either a dedicated endorsement – a “scheduled personal property endorsement” in the vocabulary of Anglo-Saxon insurers, the equivalent of an extended warranty for valuable items in France – or a specific policy for collections. This type of contract often works on an agreed value and without excess for the goods listed, which changes everything at the time of a loss.
Concretely, insurers request a detailed inventory including, for each number: title, issue number, condition (graded or not), and for certified copies, the serial number of the hull accompanied by a photo of the label. Purchase invoices, convention tickets or valuation certificates complete this file as proof of ownership and value. For individual items exceeding $25,000, a professional appraisal and nominative registration of the property are generally required by insurers specializing in collectibles.
This is exactly what a good collection export should produce: a file that includes these fields without the need to re-enter everything when filling out a claim file. A practical and often overlooked tip: this file must be stored elsewhere than in the house which contains the collection itself - cloud, mailbox, USB key at a loved one's - otherwise a fire or flood destroys both the comics and the proof of their existence.
Check the accuracy of your data before exporting
An export only has value if the data it contains is accurate, in particular for CGC certification numbers, which are used to prove the authenticity of a copy. Before freezing an export intended for insurance or a sale, it is better to check each certification directly on the CGC website, via its certification search tool (“cert lookup”), by entering the number printed on the label. This number is generally composed of ten digits, sometimes preceded by a short prefix depending on the type of label. The form returned by CGC must correspond exactly to what appears on the physical shell: same title, same number, same grade, same color of label. The slightest discrepancy deserves to be clarified before considering the information as reliable in your export.
On the most recent labels, CGC has added a QR code which allows you to check the certification directly from a phone, without having to re-type the number by hand - a significant time saving when checking several dozen numbers before a complete export.
To assess the relative rarity of an issue rather than coming up with a figure at random, the CGC population report (the “census”), organized by publisher, by title then by issue, indicates how many copies were graded at each grade for a given issue. This is factual data - and not an estimate - which has its place in an export intended to seriously document a collection, particularly for key issues whose rarity in high grades justifies a significant part of the value.
Buying guide
- Do a first complete export as soon as your collection exceeds thirty issues: beyond that, manual re-entry in the event of loss becomes really painful.
- Date each export in its file name (for example with the year and month) to be able to find the version corresponding to an insurance claim or a specific sale.
- Separates, at least by a dedicated column, the graded numbers from the raw numbers: the fields to check (certification number, label color) are not the same.
- Systematically check the CGC certification numbers on the official search tool before considering an export as final, especially if the file is to be used as proof for an insurer.
- Includes double-sided photos for each issue, and a full label photo for each copy under cover — this is often what is most missing from claims files.
- Keep two copies of each export: one local, one hosted elsewhere than at home (cloud, email, support from a loved one), so that a domestic disaster does not also destroy the proof of your collection.
- Choose the format according to use: CSV/Excel to sort and calculate, PDF for a fixed file intended for an insurer or a notary, JSON if you are migrating to another management tool.
- Re-export after each significant acquisition rather than waiting for a fixed deadline: a two-year-old export that omits the last purchased parts loses a large part of its interest in the event of a disaster.
- Before a lot sale, prepare a dedicated export sorted by series and by condition: this saves the potential buyer from having to reorganize everything themselves, and speeds up the negotiation.