Design File Formats for Print: JPG, PNG, PDF, EPS and More

A print store receives files in many formats, and only some of them print well. This guide explains the seven formats customers send most, which of them are built for print, and what a store should accept at upload. How many pixels a print needs is covered in how DPI affects print quality.

What format do you use for your online design files?

The format of an online design file depends on where it ends: JPG, PNG and GIF are raster formats for screens and the web, PSD is Photoshop's layered working file, and EPS, PDF and AI are vector-based formats for print. Choosing the right one decides whether a design stays sharp when it is resized and printed.

Information technology keeps developing, leading to a variety of specialized software for imaging and graphic design, and with it, many different image and design file formats. This causes difficulties for designers, especially beginners, who often find it hard to tell these formats apart. Here are the 7 most common design file formats and what each one is for.

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<a href="https://solution.printcart.com/insight/design-file-formats-for-print"><img src="https://solution.printcart.com/insight/design-file-formats-for-print/format-matrix.webp" alt="Matrix of JPG, PNG, GIF, PSD, EPS, PDF and AI against scaling without loss, transparency and print use" width="1440" height="810"></a><br>Source: <a href="https://solution.printcart.com/insight/design-file-formats-for-print">Printcart</a>

What is a JPG file and is it good for print?

A JPG, or JPEG, is a raster image format that uses lossy compression: it makes photos small, but some quality is lost each time the image is recompressed. JPG is widely used on the internet and by most digital cameras, and it suits photo prints when the file has enough pixels; for text, logos and layouts a print shop prefers PDF.

JPG, or JPEG (Joint Photographic Experts Group), combines red, green and blue to display millions of colors. JPG compresses images well: a 1MB photo can shrink to 500KB or 100KB, and the JPEG article on Wikipedia puts the typical ratio at 10:1. But JPG is a lossy format, meaning the image loses quality each time it is re-saved or re-exported, which shows up as blurred, defocused areas when the image is enlarged. For that reason, JPG is mainly used for display on electronic devices, and rarely for professional editing or printing.

Characteristics of JPG files:

• Commonly used for digital images and images displayed on screens.
• Loses some image quality each time it is compressed.
• Does not support a transparent background.
• Not used for printing, except small, high-quality images such as photo prints.

Whether a photo has enough pixels depends on the print size: the table of minimum pixels for common print sizes gives the width and height a JPG needs at 300 and 150 DPI.

What is a PNG file used for?

A PNG (Portable Network Graphics) is a raster image format with lossless compression and transparency, used for logos, icons and screen graphics that need a clear background. PNG keeps its quality however often it is saved, but it supports only RGB colour, not the CMYK colour of print, so print shops convert PNG artwork before production.

PNG uses lossless compression, so its quality is preserved no matter how many times it is saved. PNG supports transparent backgrounds, so images like icons and logos without a background are usually saved as PNG. This lets them be placed anywhere without a visible border.

PNG files are larger than JPEG, which is one reason PNG is less common for general web use, outside of logos that need a transparent or translucent background. The PNG specification does not support non-RGB colour spaces such as CMYK.

Characteristics of PNG files:

• Commonly used for graphic design and images with text displayed on screens.
• Keeps image quality when compressed.
• Supports images without a background (transparency).
• Rarely used for printing, since it stores RGB colour only.

What is a PSD file?

A PSD, short for Photoshop Document, is Adobe Photoshop's native file format, which saves an image as layers that can still be edited after saving. Designers keep a PSD as the working copy of a design and export a flat file, such as PDF, JPEG or TIFF, for printing; PSD is a raster format, so enlarging it beyond its size reduces quality.

PSD saves a file as layers that can still be edited after saving. Once editing is finished, Photoshop can merge the layers and export to another format such as JPEG, GIF or TIFF. Once a file is saved in a format other than .psd, it generally cannot be edited the same way again, so it is worth keeping a PSD copy in case further edits are needed later.

Characteristics of PSD files:

• A specialized format for editing images in Adobe Photoshop, with layers, masks, actions and filters.
• Built on a raster platform, so enlarging beyond the original size loses quality.
• Not used for printing directly and does not support vectors.

What is a GIF file?

A GIF (Graphics Interchange Format) is a long-standing raster format limited to 256 colours per image, with lossless LZW compression and support for simple animation and a transparent colour. GIF is used for animated images on websites and social media; its small palette makes it unsuitable for photos and for print.

GIF is an 8-bit color file, limited to a maximum of 256 colors, so complex images with many tones lose color accuracy when converted to GIF. Because it supports so few colors, a GIF file is often much smaller than an equivalent JPEG. GIF also supports simple animation, created in software such as Photoshop, and compresses losslessly, so there is no data loss when compressing.

Characteristics of GIF files:

• Commonly used online for animated images, including on social media.
• Smaller file size and supports transparency, similar to PNG but at lower color quality.

What is an EPS file used for in print?

An EPS (Encapsulated PostScript) is a vector graphics format for logos, drawings and illustrations that are placed inside other documents for print. Being vector-based, an EPS file can be enlarged or reduced without changing its quality, and design software such as Adobe Illustrator, Photoshop or CorelDRAW opens it or converts it to JPEG, PDF or TIFF.

EPS saves graphics such as logos, drawings and illustrations in vector format, and is used mainly for print rather than online display. An EPS file usually carries a low-resolution preview for the screen next to the vector drawing.

Characteristics of EPS files:

• Used for icons and illustrations as vector graphics.
• Built on a vector platform, so size can be increased or decreased without losing quality.
• Can be used for printing, not for online display.
• Can be opened with Adobe Illustrator and Photoshop.

Why is PDF the usual file for printing?

PDF is the usual print file because one PDF keeps vector graphics, text with embedded fonts and images together, so it prints the same on any device. Many commercial printers accept press-ready PDF files, specifically the PDF/X-1a subset. A PDF is also small enough to share, which suits customers sending a finished design.

PDF files have limited editing capability because the format is intended for publishing and sharing rather than ongoing editing. This is why many people save a finished Word document as a PDF before sending it to others, to avoid font substitution issues on the recipient's computer.

The same applies to complex design files like AI or PSD: saving the final version as a PDF lets it print reliably on any device. A PDF is often a combination of vector graphics, text and bitmap images, so its vector parts resize without losing quality while its photos keep their pixels.

Characteristics of PDF files:

• Used to share documents with design or print quality intact.
• Vector parts can be resized without losing quality; images keep their resolution.
• Suitable for both online display and printing.

A working file becomes a print PDF in a few checks. The Printcart guide to print-ready files lists them: 300 DPI at the final print size, 3 mm of bleed beyond the trim edge, key content 3 to 5 mm inside the trim, CMYK for most presses, and fonts outlined or embedded, then a print PDF or the format the printer asks for.

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<a href="https://solution.printcart.com/insight/design-file-formats-for-print"><img src="https://solution.printcart.com/insight/design-file-formats-for-print/prepare-flow.webp" alt="Four steps: work in AI or PSD, set 300 DPI and 3 mm bleed, convert to CMYK with fonts embedded, export a print PDF" width="1440" height="810"></a><br>Source: <a href="https://solution.printcart.com/insight/design-file-formats-for-print">Printcart</a>

What is an AI file?

An AI file is Adobe Illustrator's native vector format, which preserves the full editable design: paths, text, layers and artboards. Like EPS, it can be zoomed in or out without affecting quality. AI files are large, so designers export the finished design to PDF or EPS for fast, lossless printing.

AI files tend to be large, since they preserve the full editable design, which is why they are often saved as EPS or PDF for printing.

Characteristics of AI files:

• A specialized format for graphic design and publications, created in Adobe Illustrator.
• Built on a vector basis, so it can be resized without losing quality.
• Not intended for online display; typically exported to EPS or PDF for printing.

What is a CMYK JPEG and when does a print shop need one?

A CMYK JPEG is a JPG file whose colours are stored as cyan, magenta, yellow and black, the four inks of colour printing, instead of the red, green and blue of a screen. A print shop needs it when production expects a flat image file: colours visible on screen may not be reproducible in print, so a CMYK file shows what the press will print.

The CMYK colour model is subtractive: inks reduce the light reflected by white paper. Customers often want to save their customized designs as a keepsake or for future use, while the print shop needs a production file in CMYK. However, certain limitations, such as the inability to install Imagick on some websites, made it hard to export designs as JPEG files without compromising font quality.

Printcart built a cloud export that exported designs into CMYK JPEG without additional tools or installations on the store's server. In the earlier version of the Printcart product designer plugin for WordPress, the store admin enabled the cloud export of designs to JPEG and PNG in the settings, then downloaded each customer's design from the order's design detail screen in SVG, PNG, CMYK JPEG or PDF.

In the current Printcart plugin for WordPress / WooCommerce, every order produces high-resolution print-ready files in PDF, SVG, PNG and JPG CMYK, so no separate export setting or extra software is needed. Exporting designs in CMYK JPEG format is no longer a technical challenge.

Which files should a print store accept from customers?

A print store should accept print PDF as its first choice, AI and EPS for vector logos and illustrations, and JPG for photos that have enough pixels at the print size, and ask for a new file when a customer sends a web PNG or GIF or a layered PSD. The store sets the allowed file types, size limit and minimum DPI at upload.

In a Printcart store the owner sets the allowed formats as a list such as jpg,png,pdf, the number of uploads and a maximum size in MB, as the upload tutorial shows; a file in another format is refused with a message naming the accepted types. The artwork upload page shows how customers upload their files in a Printcart full store.

The accepted formats are one part of a wider print-ready file policy: what the store checks at upload, what its team can fix and what it declines, and what it tells the customer.

What happens to a customer's file in a Printcart store?

In a Printcart store a customer's file goes through four stages: the customer uploads artwork or designs online, the store checks the file type, size and resolution and can run a preflight check, Printcart makes the print files of the order in PDF, SVG, PNG and JPG CMYK, and the print team downloads them from the order or the Printcart dashboard.

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<a href="https://solution.printcart.com/insight/design-file-formats-for-print"><img src="https://solution.printcart.com/insight/design-file-formats-for-print/file-flow.webp" alt="Four steps: customer uploads or designs, the store checks the file, Printcart makes print files, the team downloads them" width="1440" height="810"></a><br>Source: <a href="https://solution.printcart.com/insight/design-file-formats-for-print">Printcart</a>

The Printcart product designer has also added PDF as an export format, giving store owners another choice alongside JPG and PNG when customers design products online. The article on how an online product designer produces the print file follows a design from the product page to that file. Every order in a Printcart full store comes with a print-ready file, as the print-ready files page describes, and the WordPress print shop store runs on the same Printcart plugin. A store that needs another output, such as a printer's own file naming or format, can have it built by the print file output customization service.

Conclusion

Understanding the range of design file formats is useful for any designer, from beginners to professionals. Each format serves a different purpose, and choosing the right one for each task helps a design look its best regardless of the medium or platform, whether that is a screen, a shared document, or a final print.

In a web-to-print store, the file is checked when the customer uploads it: job submission software follows a file from upload through checks and proofs to production, and the cost of unprintable files is one of the print costs that these checks remove.