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If you're talking about digital comics, it doesn't get any bigger than Amazon-owned Comixology. They're the name in digital comics and probably the largest retailer of comics out there. Because of how monstrous the platform actually is, getting on Comixology can get your work in front of a lot of readers. A LOT. Titles that perform well there can even lead to getting published by traditional comic publishers.
The Comixology submission and acceptance / rejection process from what I can tell is just as shrouded in secrecy as most other tech company platforms. They have specific guidelines and rules that need to be adhered to in order to be accepted and they also appear to have their own view of "quality". Now, I haven't personally submitted to Comixology yet, although I plan to and when I do I'll write a detailed review of the process, but Comixology is the final judge of whether your comic is worthy of publishing on their platform. All I'm saying here is that indie creators who may not necessarily adhere to the "traditional" art forms or formats and methods of comic creation might run into an issue here as opposed to other platforms. Comixology has a specific kind of image that they want to uphold and I can understand why that is and I certainly think they know what they are doing when it comes to publishing comics because look at what they've built. I think what they've done for the comic book industry by dramatically increasing the reach to all kinds of readers is fantastic, however…
There are some pain points in dealing with Comixology. For one, the sales reports…
From what I can tell, there aren't any, so you don't really know how well your book is selling. The seller payment system also can be difficult. As opposed to other platforms, Comixology pays on a quarterly basis, 45 days after the quarter has ended, if you've reached the $100 threshold, in the form of a mailed check. So for all it's advantages of exposure and reach, depending on Comixology as an income stream can be very challenging for independent creators.
The fees for selling on Comixology are also not insignificant. While free to publish your work on the platform (provided your book is accepted) you'll get 50% of the cut after transaction fees and taxes. Oof.
Formatting for Comixology, by that I mean size, image quality, layout, and lettering should be something you consider as you create your comic. There's nothing worse than working for weeks and months or even years to finish your book and then realizing the panels are going to get cut off or your DPI is screwed up. Doing a simple internet search for comic book formats or templates is like having one thousand people screaming back at you their own opinion and telling you how they're the ones who are right. I've been hard-pressed, to find a format and layout requirements that are agreed upon by everyone. With that said, Comixology has their own recommendations for formatting and layout and I think indie creators with an eye towards eventually publishing on Comixology should get used to using them as a standard so that when you do make the eventual jump to submitting, you'll avoid as many headaches as possible.
Standard US Comic Book Page Print Dimensions (According to Comixology)
File type: PDF
BLEED SIZE: 6.875” x 10.437”
This is the TOTAL SIZE of your page files including a 0.125” bleed on all sides. The bleed will be trimmed off so artwork that goes to the edge of trim should bleed off the page. Make sure all artwork fills the bleed area.
TRIM SIZE: 6.625” x 10.187”
This is the actual page size of the book when trimmed, folded & stapled.
LIVE AREA: 6.125” x 9.687”
Also known as “safe zone.” This is the area that your lettering should be contained within, to ensure it’s not too close to the trim.
Double Page Spread:
BLEED SIZE: 13.5” x 10.437”
TRIM SIZE: 13.25” x 10.187”
LIVE AREA: 12.75” x 9.687”
To ensure your art/lettering doesn’t get lost in the gutter, leave a 0.5” type gutter down the middle. This is especially necessary for thick collections.
Lettering: Comixology recommends using industry standard lettering fonts for your comic such as those made by ComicCraft of Blambot.
Fees: After processing fees, 50%.
Publishing on Comixology for indie comic book creators can definitely be seen as the "end game." That is, it should definitely be where you see your work eventually being published, but not necessarily right out of the gate. There's just too many gatekeepers and requirements for me to endorse aiming for this at the beginning of your comic making career. For those who have had a few projects under their belts and are looking for the next plateau, definitely start investing your time in the platform.
Submission Guidelines on Comixology