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Beginner's handbook

Everything You Need to Know to Prepare the Perfect Print File (Remastered)

By Reading Time: 9 minutes

The success of your online store heavily relies on the quality of your products, and the quality of your products relies on the print files you create. The better the quality of your print files and designs, the better the overall quality of your products.

Putting in the work means there’ll be less of a risk of your order being delayed due to your design not meeting Printful requirements. Remember that it’s not just about the order: at that end of every delayed order is a customer who’s likely to become upset by having to wait for the product they’re so excited about.

The golden rule behind nailing your Printful print files is—follow the guidelines created by our in-house experts. To explain to you Printful’s make-or-break print file requirements in greater detail, I asked Printful’s Graphics Team for tips that can help you on your way to the perfect print file.

Print file terminology

Let’s lay the foundation here and get into some terminology. It’ll help you get a better grasp of the rest of this blog and Printful’s print file guidelines.

Print size is the actual size of the image as it’ll come out printed on the product. It’s measured in inches or centimeters.

Image file size is measured in bytes. It tells you how much space the image takes up on a disk or drive. For example, the maximum file size of an image you can upload on Printful’s Design Maker is 200 MB.

A pixel is a unit of measurement for digital images you see on a screen.

Pixel dimensions express the total number of pixels along a digital image’s width (vertical) and height (horizontal).

Resolution expresses the density of pixels or dots in an image. For digital images, resolution is expressed in PPI—pixels per inch. For printed images, resolution is expressed in DPI—dots per inch.

DPI (dots per inch) is a printing term. Digital devices display images in pixels, and printers print images in dots. DPI is calculated using your digital image’s pixel dimensions and digital image size.

The higher the DPI = the more the dots = the sharper the print.
The lower the DPI = the fewer the dots = the blurrier the print.

To help you visualize the relation between dimensions and resolution, look at the 3 penguins below. The images have the same dimensions (width and height), but they have different resolutions (DPI).

So, which penguin looks the best?

printful-DPI-differences
DPI makes a difference

Unless you’re an advocate of the lo-fi look, you’ll agree the best-looking penguin is the 150 DPI one on the far right. And this is also the penguin that will look the best printed.

Terminology is out of the way. Now back to Printful print files.

Guidelines for Printful print files

For the best results, always check the Printful guidelines and print file templates in the File guidelines tab under each product. That way, you don’t have to worry about the right file formats and DPIs—we’ve got it all figured out for you!

printful-file-guidelines
The File guidelines tab is your friend

A good way of creating designs for print files with the right dimensions and resolution is by using Printful print file templates, especially for all-over print (AOP) and embroidery products. For embroidery, the templates will help you figure how thick your design elements would be, and for AOP, the templates will give you a better understanding of your design size and placement. 

If you’re just getting started with creating digital designs, remember that the built-in tools in Printful’s Design Maker (Clipart, Text Tool, Quick Design, etc.) are a fail-proof way to make good print files because our team made them with quality in mind.

Some more good news: the Design Maker, where you’ll upload your design and create your print file, will also give you warnings when your image isn’t suitable for printing.

Onto the make-or-break guidelines. 

  • Accepted print file formats: PNG, JPEG.
  • Accepted embroidery file formats: EPS, PNG (JPG accepted, but not recommended: design elements in images of this format always have a background which can make the design look bad, and JPG also unnecessarily increases the embroidery stitch count, making it easy to go beyond the limit).
  • Maximum size of the print area: depends on the product you choose (e.g. the standard print area for t-shirts is 12″ × 16″, but for 11 oz. mugs—9″ × 3.5″).
  • Print file resolution (DPI): again, depends on the product, but should be at least 150 DPI, and no higher than 300—going beyond 300 DPI won’t improve the print quality, just increase file size.

    • Print files for smaller items, like mugs or personalized phone cases, need a DPI higher than 150 because those prints are small and often detailed. We recommend submitting designs for these products with a DPI of 300.
  • Color profile: the final version of your print file should be saved in the sRGB color profile sRGB IEC61966-2.1. You can set the color profile in the image editing software you’re using.  

    • Why sRGB and not CMYK?  

      sRGB has a wider, more vibrant color range (aka gamut) compared to CMYK.

      Our DTG printers work with an upgraded CMYK color space where we’ve added more ink colors, allowing us to achieve print colors that normally fall outside of the CMYK color range. The closest color space to our upgraded CMYK is the sRGB IEC61966-2.1 and that’s why we recommend it for print files.

      Read also: Color Matching Guide for Print-on-Demand Products
  • Acceptable content: your design has to follow Printful’s Acceptable Content Guidelines. If your design is hateful, illegal, or violates any intellectual property rights, our team may block it. You’ll still see the file in your order or File library, but you’ll receive a warning about your design being blocked and we won’t print it.

Read also: Can I Print That? Copyright and Trademark 101

5 Printful print file mistakes and how to fix them

Now that you have an idea of what it takes to create a perfect print file, let’s look at some reasons that can cause your designs to come out in low quality and how to get past them.

1. You resized a low-quality image lowering its DPI even more

As a coffee fanatic, you wanted to create a t-shirt with a moka pot. You found a copyright-free design and uploaded it to the Design Maker.

Turns out the 335 × 410 px royalty-free image looks tiny in the 12″ × 16″ t-shirt print area. You decide to enlarge the image right there in the Design Maker.

As the image dimensions grow, the number of dots per inch shrinks. The DPI registers as 60—well below Printful’s recommended range of 150–300. What can you do?

bad-quality-print-file-example
Low quality image (left), the same image enlarged (right)

Four options here:

A) You find a new, high-quality image of a moka pot, one that’s 150–300 DPI from the get-go

B) You settle for a smaller image than you wanted 

C) You turn your low-quality image into a vector  

D) You use the image adjusted by Printful’s Smart Image Tool

Option A is self-explanatory, so let’s go into options B, C, and D.

B. You settle for a smaller image than you wanted

In the Design Maker, you reduce the dimensions of the image using the blue corners. The dots of the image DPI come closer together, forming a smaller, yet crisper-looking moka pot. You admit it’s not ideal, but accept that it’ll do for what you had in mind.

print-file-mockup-generator
A bit sad, but might work as a pocket print!

C. You turn your low-quality image into a vector

If you have the time or the experience, you can recreate your low-quality moka pot as a vector, using a vector editing program (Illustrator, Inkscape, Affinity Designer, etc.) or an online convertor.  Another option is to get in touch with Printful’s Graphic Design Services for a helping hand.  

Vectors are graphics made of points, lines, curves, and shapes that are based on math formulas. They’re cool because you can resize them as you want without losing any quality. In the design software mentioned, you can use the image trace or pen tools to convert your low-quality graphic into a vector.

Once you have your vector, resize the image as needed for your design and export it as a PNG file. At this point, your vector file has become a raster image. Now, you can upload it to the Design Maker and continue designing.

If you want to use stock vectors or other stock images for your designs, double-check that the content is not copyrighted and the image size and DPI are equal to or higher than what Printful recommends.

D. You use the image adjusted with Printful’s Smart Image Tool

First, though, what’s the Smart Image Tool and how does it work?

It works with the help of Artificial Intelligence (AI). The AI we’re using has studied more than 10,000 images to predict how image “information” (number of dots) behaves depending on the changes in image size.

If you want to enlarge an image with a DPI of 38–74, Printful’s Smart Image Tool can make the image size two times bigger than the original without losing any quality. 

In the case of the 60 DPI moka pot: 

  • The Smart Image Tool analyzes the image to see what information can be added to meet Printful’s minimum print requirements   
  • The tool adds the missing information, so that the ”Average” 60 DPI image becomes a 120 DPI “Adjusted” version
  • The adjusted moka pot is still below the recommended 150 DPI, but it meets Printful’s minimum print quality recommendations, and you can add the adjusted design to your store anyway
The Smart Image Tool in action

Remember that if your product design doesn’t meet the absolute minimum print requirements, the Design Maker won’t allow you to proceed.

After the minimum requirements are met, though, the quality of your design is in your hands. That’s why we strongly suggest not to try your luck, follow Printful’s guidelines, and choose quality!

2. You made a DTG design with a background that shouldn’t be there

Avoid adding a background color unless it’s a part of your design—this is especially important for the apparel designs you want printed using the direct-to-garment (DTG) technique.

Why? The printer will print all the colors it sees in the design. For the printer, a black background on a black garment does not equal transparent. 

So if you create a DTG design with a black background on a black garment, be aware that it’ll leave a grayish rectangle around your design. And it’ll be gray because prints on all non-white garments require a white underbase to help the colors stand out.

If you want the gray rectangle, that’s cool. But if you don’t, remove the background! 

If you’re not sure if your design has a solid background, open the file in Photoshop, GIMP, or similar image editing software. If the background is transparent, you’ll see the standard white-and-gray checkered background.

white-vs-transparent-background
Design with a white background (left), design without a background (right)

3. You went crazy with transparency where you should’ve kept cool

Transparency as a design element works best for all-over print (AOP) and some other products, but might not look good on DTG. 

The way transparent elements will come out in DTG depends on: 

  • How the design was created (e.g. you used feather brushes, semi-transparent layers, or similar effects, unaware that they’re a kind of transparency) 
  • The transparency level of the elements (100% transparent or semi-transparent) 
  • The color of the garment they’re printed on = if the garment needs white underbase

    • White garments = no white underbase, transparencies will print out fine
    • Non-white, light-colored garments = white underbase will be difficult to notice, but might shine through semi-transparent areas 
    • Dark-colored garments = white underbase might be visible as small white speckles in semi-transparent areas 

Bottom line: keep the white underbase in mind when creating a DTG design, and consider whether or not a semi-transparent effect is what you want. Some designers like the effect of the white underbase showing through, so it’s a matter of taste!

printful-print-file-dtg
Here, the white underbase peeking through is a design decision

For AOP (sweatpants, leggings, etc.) and sublimation (mugs, towels, etc.) products, transparent elements are OK to use because these printing techniques don’t call for white underbase. For AOP, though, you still may want to fill in the entire print area with solid shapes or colors as much as you can to avoid any blank white fabric showing. Unless, again, it’s a part of your design!

Important note on phone cases: The components of your phone case designs should be at 0% or 100% transparency. We don’t recommend semi-transparencies because the final result will end up patchy.

If semi-transparencies are your thing, our Graphics Team recommends using the halftone effect instead. Halftone can be used on any kind of product, regardless of the printing process.

4. You didn’t remove your background properly

Sometimes a design looks fuzzy and low-quality not because of poor DPI, but because the design is left with fuzzy edges from the background not having been removed properly. 

To avoid the fuzz, in your image editing software, duplicate your final design with the transparent background multiple times. The little bits you missed will become more visible and you’ll be able to easily remove those unsightly edges.

Here’s what you might see after duplicating those layers:

print-file-dtg-edges
The yellow arrows point to the fuzzy edges that need to be removed

5. You chose the wrong product for your print

Every product has a different texture and feel when printed.

That’s why, when choosing products for your designs, think about the print placement and design elements, and whether your vision will work for this product. The rule of thumb is, patterns look good as all-over prints, photographs work well as posters, and typography designs are perfect for DTG and embroidery products.

If you’re selling apparel, remember that your designs will also look slightly different depending on the fabrics and fabric blends you print on.

For example, ink is more spread out and looks more faded on sweatshirts than t-shirts since sweatshirts are made from a thicker fabric. And due to the looser weave and combination of fabrics in tri-blends, DTG prints on tri-blend garments will have a vintage feel—the fabric of the garment will peep through the ink (watch out for tips like these in our product descriptions!). 

For some, that faded or vintage feel will be just what the doctor ordered, for others, the print won’t look as imagined and will be perceived as poor quality. 

Read also: Guide to Cotton, Polyester, and Blended Fabrics

On your way to a perfect print file

If there’s one thing to remember from this blog post—stick to our print file guidelines. Knowing the terminology and Printful specs is a must if you want your orders to reach your customers without hiccups. 

If you need help creating, editing, or formatting your print files, get in touch with Printful’s Graphic Design Services.

Ready to start designing? Head to Printful’s Design Maker and have a go! To make it more fun, check out this batch of typography designs that you can use on Printful products— download below. 

This article was originally published in November 2017; it has since been updated.

Marianna Zvaigzne is the Head of Brand Language at Printful. With the help of her team, she’s pinning down what it means to “sound like Printful” and keeps Printful copywriters on their toes with animated editing sessions and writing workshops.

Comments

  1. K

    Hi, I commented on another post about a month ago (regarding Inkscape) and I’m here again because I asked about this new situation in other places but I haven’t gotten a response. I still plan on using Inkscape with Printful in the near future but I decided to use Canva for this project in particular because I’m more used to it, and the fact that it was a bit faster for me given all the designs that I did.

    The new situation is about Canva and uploading the designs from there to Printful correctly.

    I recently uploaded some designs from Canva to the “Choose File” section in Printful, and I’m trying to make sure that the designs will come out okay when printed. Some, or all of the files that I have so far don’t meet a couple of the standards that Printful has set in the must-follow guidelines section for designing and uploading the images, and I’m trying to get some guidance and make sure that they will meet the standards, or at least look nice when printed. Below are the questions that I have regarding the matter:

    On Printful I see that they’re asking for files that are at least 150 DPI, but most or all of my PNG design files from Canva are coming out in 96 DPI on Printful in the “Choose File” section.

    I want to make the DPI at least 150, so I’ve found a website called //convert.town/image-dpi where I can submit my PNG file downloaded from Canva and then upload it to the website mentioned above, and then it will convert the file to 150 DPI. Would the file still come out okay on Printful when printed if I did it that way?

    And when I upload the design file on Printful, it says that the file is 150 DPI but that the “print quality” is 105 PDI. What does this mean? And do I need to make the print quality better or just leave it alone? And if I need to make it better, how can I do that? It only says this for some of my designs.

    Also, some of my designs were resized in Canva, as well as some on Printful also in the “File View” section. Would they come out alright as prints, or did I ruin my chances of having a decent design?

    I put the design resolution down in Canva as instructed on Printful. 19 x 19 for one file and 5.8×5.8 for another. Do I have to slightly alter the resolution sizes in Canva making them slightly bigger (like making it 20×20 instead of 19×19, for example), or should the resolution sizes be exactly as instructed on Printful?
    I’m just trying to make sure that my designs come out okay when printed. I spent a lot of time on them and I don’t want it all to be in vain. I don’t mean to take up your time but I appreciate your help. I’m just learning as I go.

    1. Alise Zindiga

      Hey! Here’s a video tutorial I found online that shows how to increase file resolution on Canva > //www.youtube.com/watch?v=XjDh5PmHiyM
      Resizing your print file elsewhere would only lower the quality even more (please refer to the section “1. You resized a low-quality image lowering its DPI even more” of this blog post). We suggest making files with a 150 DPI resolution, but for larger products like canvas, beanbags, etc., you can increase up to 300 DPI.

  2. Lita Coldfield

    I’d greatly appreciate it if you can make a separate page with the pixel dimensions for each of Printful products, and with links to the templates.

    Also, please, confirm or disprove my assumption that the value of the pHSy chunk (DPI) of the PNG file is irrelevant. I believe that as long as the pixel dimensions of the image are appropriate, Printful will be able to print it with good quality, no matter if the pHSy chunk is set to 72, 92, 96, 150, 300, or 54546084.6338 DPI.

    For example, Printful requirements for a t-shirt image size is 12″ × 16″ with min 150 DPI, max 300 DPI. This means that I need an image with the pixel dimensions of min 1800×2400 pixels, max 3600×4800 pixels. I think that as long as my file is 1800×2400 pixels or more, the printed image will be of good quality, no matter how many DPI are specified in the PNG file itself.
    _____________________
    Printful requirements specify the print size (in inches) and DPI, however, both of these parameters are variables. Even in the mockup generator, you can scale down the image, changing its print size and increasing its DPI, or you can increase the print size while decreasing the DPI.

    Furthermore, various graphic editors treat all 3 parameters differently, whether it’s Adobe or non-Adobe, raster or vector. Most of the programs allow specifying image dimensions either in inches/mm (the program will use DPI (PPI) to calculate the resulting pixel dimensions) or directly in pixels. The vector editors like Inkscape don’t care about DPI/PPI (and they have a very good reason for that, lol).

    Apart from it, we all here have different backgrounds and knowledge, we use different editors and have different workflows. Some of us create our own bitmap images, others prefer vector, some are using clipart downloaded from who knows where, and some just want to print a photo from their mobile phone.

    Because of that, I think that the requirement “the image should be NxM inches and X DPI” is unclear and may be misleading. It works well for people who create a new file in Photoshop or Gimp. But if they use Canva, PlaceIt, or Inkscape, it makes little to no sense. They will have to calculate the pixel dimensions. As for the people who know nothing about image sizes and dimensions, they are in bad luck. Imagine a guy who saw a funny (free) meme and wants to order a t-shirt with it (personal use only, lol). He downloads the image and sees that it is 12×16 inches but 72 DPI (or PPI, whatever). So he goes to Google and uses a DPI Converter. Now he has an image 12×16 inches with 300 DPI, which satisfies your requirements perfectly. And then he will get an awful t-shirt that can only be thrown out, despite following your requirements to the letter.

    I think that the most important parameter of the uploaded image is its pixel dimensions, which is the constant parameter you cannot change in the mockup generator. And this is what defines the quality of the end product and what the mockup generator uses to calculate image print size and DPI.

    The PNG format doesn’t even have a field for the image print size. And even though there is a chunk for pixel dimensions (pHYs, specifies pixels per meter), the absolute majority of POD services don’t give a damn about it (and seeing how Printful mockup generator re-calculates DPI depending on the image scaling, Printful doesn’t care about it either). What they care about is pixel dimensions and this is exactly what is missing in this article.

    1. Alise Zindiga

      Hey, Lita, thanks for reaching out! Please find the answers to your questions below.
      A pixel is the smallest unit of a digital image or graphic that can be displayed and represented on a digital display device. We are using inches/cm in our guidelines because those units are intended for non-digital methods, comparing to a pixel that’s meant for digital use. DPI refers to the number of printed dots contained within one inch of an image printed by a printer. PPI refers to the number of pixels contained within one inch of an image displayed on a computer monitor. Therefore, if we are submitting the print files with the dimensions 12×16′ at 150dpi, then the file with the dimensions 1800x2400px resolution should be 150dpi as well. We recommend using units that are meant to be used for printing, not digital use.
      To make it easier you can download our templates and guidelines for every product from the Product Catalog. With our guidelines, we are helping our customers to reach the best possible print result—keep in mind that to achieve that we’re working with non-digital units. Files that are available for downloading online usually are meant for digital use, therefore, they might not be the best to use as print files.

  3. AV

    Hi,

    I have ordered a mug and it turned out with darker and warmer colors. I know the specifics, so I prepared the file using your template, in the proper color space and saved the file on PNG with the maximum resolution… but even so I was not pleased with the print. Is there something I am missing? Do you have any ICC profile I could use in order to color-proof my file and be able to know better how the colors will work once sublimated on mugs? I used your template with your specs and the mock-up was looking right when I ordered the mug… but it was different from the end result, so I feel a little lost here.

    1. Alise Zindiga

      I’m sorry to hear about your experience but it’s hard to tell whether this is a fulfillment error or not without seeing your print files. Please submit a problem report with us and we’ll check it for you. Here’s how to submit the problem report: //help.printful.com/hc/en-us/articles/360014066699-How-do-I-report-a-problem-with-my-order-
      Another thing that you can do is to try color swatches on mugs to match the colors more successfully in the future. You can download our swatch file from this FAQ: //help.printful.com/hc/en-us/articles/360014007700-Color-Matching-Disclaimer

  4. Sam

    I love Printful. But you guys need to do something about the cheaper t-shirts and have a bigger print area. The all over prints are SO expensive, but the shirts with smaller a print area have such a small design…

    1. Alise Zindiga

      Hey, Sam, unfortunately, we’re not planning to increase the printing area for DTG products in the nearest future due to technical limitations. Besides, our pricing doesn’t include just the product itself. It also includes printing, labor, fulfillment, our platform, customer support, and all the other features we offer without any extra charge. We regularly review our pricing and lower it when applicable.

  5. RAMONGARCIA

    YOU NEVER OR FORGOT WHICH VERSION OF ILLUSTRATOR ARE YOU GUYS USING AT THE MOMENT. FOR EXMPLE IF I AM USING iLLUSTRATOR CCS6, OR ILLUSTRATOR CC 2021. ARE THEY ACCEPTABLE?

    1. Alise Zindiga

      Color profiles don’t change on different Illustrator versions, so these guidelines work no matter the version you’re using.

  6. Totoetco

    Hi,
    First many thanks for the work you guys are doing. I appreciate it a lot. I received the comment from a customer regarding a Unisex Heavy Blend Hoodie | Gildan 18500 (Black) sweatshirt. The printing is far from perfect I have to say, despite a vector file I supplied in high resolution. Also all seems perfect from the mock up you supply with what look like vivid colours on darker garments. I wonder if the process of printing on a dark fabric involves a 1st print off the area in white flat background then a 4 screen print in order to make sure that the colours are very punchy. I tried to find out how this is done for this particular type of products but nothing seems to describe what I want. Is there a way to improve this type of printing?

  7. margo coufos

    Hi there, I am a real newbie with Printful and I am getting gear to put on a Shopify store, but I am a little confused. Quick question, with all the DPI requirements does that mean I have to have my designs which are my own, professionally photographed??
    Please advise, it probably sounds like a real dumb question, but I am learning and keen to get my gear out there
    thanks
    Margo

    1. Alise Zindiga

      Hey, Margo, DPI reflects the resolution of your design. It’s not necessarily photography—that could be a graphic design as well. I suggest playing around with our Mockup Generator for a while. It will show you if the print file has sufficient resolution. You can also use our clip art from there or try out Premium Images > //www.printful.com/mockup-generator
      In case you have any questions, feel free to reach out to our Customer Support via [email protected] or live chat.

    1. Alise Zindiga

      Hey, Donna, unfortunately, I’m not aware of 3/4 sleeve options being added any time soon. There are some long sleeves on the way, so, hopefully, that could be a good option for your niche as well.

  8. Lara

    Hi, could you tell me how many millimeters the bleed margins for the poster prints (cm) have? Is it correct that everything outside the dotted lines in the file upload section is considered for the bleed margin? That would be helpful to know in order to create the ideal print file. Thank you.

    1. Alise Zindiga

      Hey, Lara, the size of the bleed margin depends on the poster size, and it’s true that everything outside the safe printing area is considered to be a bleed margin. We suggest using our file templates for creating the best print file. You can download these templates from the Product Catalog under the tab “File guidelines”.

  9. Melissa Thompson

    Maybe I’m overthinking this or not thinking about it the correct way, but this is the big snag preventing me from getting going with Printful.

    I have been using Canva to create images. I found where I can convert them to make sure that they are 300dpi, so I have one problem solved (sort of). The process I saw shows me converting a PDF print to a JPEG with 300dpi. My issue is this: Don’t I need a PNG file for my t-shirts? I don’t want a big rectangle or square around my image. I just want ONLY the image to print and won’t there be a background if I do a JPEG file? Isn’t a PNG file to give me that transparent background behind my image?

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