Production & QC
How to Prepare Artwork Files for Cosmetic Packaging Approval
Artwork rejection is one of the most common causes of delay once production is otherwise ready to start. A factory can have the right bottles, caps and filling line booked, and sti
Artwork rejection is one of the most common causes of delay once production is otherwise ready to start. A factory can have the right bottles, caps and filling line booked, and still hold the batch because the label file isn't print-ready, the die-line doesn't match the actual component, or a regulatory line is missing. Learning how to prepare artwork files for cosmetic packaging approval before you send anything to a Thai manufacturer saves rounds of back-and-forth and protects your production timeline. This guide walks through what a factory's pre-press or QC team actually checks, the file structure they expect, and the most common mistakes that trigger a rejected proof.
Why artwork approval is its own step, separate from product approval
Many brand owners assume that once the formula and packaging components are confirmed, artwork is just a formality. In practice, most factories treat artwork approval as a distinct checkpoint with its own sign-off, because the printer, the filling line and sometimes a regulatory reviewer all depend on the final file independently. A factory's pre-press team is not checking whether your design looks good — that's your call. They are checking whether the file will print correctly on the chosen substrate, whether it fits the exact dimensions of the component you ordered, and whether the mandatory information required for your destination market is present and legible. Treating artwork as a parallel workstream, not an afterthought once formulation is locked, is what keeps a launch on schedule.
The file format and structure a factory actually needs
Ask your contact what print method will be used (screen printing, offset, digital label, hot stamping) before you finalize the file, because each method has different tolerances for color and fine detail. As a general baseline, most Thai packaging printers work from vector files — typically Adobe Illustrator (.ai) or print-ready PDF — with text converted to outlines so fonts don't shift between systems. Raster elements like photographs should be supplied at high resolution and placed, not embedded as low-res previews. Color should be specified in Pantone or CMYK values rather than RGB, since RGB files look correct on screen but shift unpredictably once printed. If your design uses spot colors for brand consistency, say so explicitly and provide the Pantone reference rather than leaving the printer to match from a screenshot.
Die-lines, dimensions and the physical component
A surprising share of rejected artwork isn't a design problem at all — it's a dimension mismatch. The die-line (the template outline showing where the label wraps, folds or is cut) has to be built from the actual mold or component drawing, not an approximate measurement taken with calipers. Request the factory's technical drawing or component spec sheet before your designer builds the layout, and confirm the die-line account for seams, caps, pumps or any area where the label will be interrupted. For tubes, bottles with shoulders, or jars with curved sides, ask whether a 3D mockup or physical proof will be produced before the full print run — a flat PDF rarely shows how a label will visually distort around a curve.
Regulatory and mandatory label information
Separate from design, your artwork needs to carry the information required for the country where the product will be sold — ingredient listing (INCI), net content, batch coding space, manufacturer or distributor details, and any required warnings or usage directions. Requirements differ by destination, so it's worth checking with the customs or regulatory authority in your own market rather than assuming one country's label rules apply elsewhere. What a factory can usually confirm is whether there's physical space reserved on the label or carton for a batch code and whether the text size is legible at the final printed scale — small claims or ingredient text that looks fine on a laptop screen can become unreadable once shrunk onto an actual tube.
The proofing and sign-off process
Most factories issue at least one physical or high-resolution digital proof before committing to a full print run, and this is the point where errors are cheapest to catch. When you receive a proof, check it against the original file line by line — color, text, barcode scanability, and placement — rather than skimming for overall impression. Put approval in writing (email or a signed proof sheet) and keep a copy, since this becomes the reference if a printed batch doesn't match later. If changes are needed after the first proof, expect a second round rather than assuming a verbal correction will be caught automatically; confirming revisions in writing on each round is what prevents the same mistake reappearing in the final print.
Common mistakes that cause rejection or delay
A few recurring issues account for most artwork hold-ups: fonts not outlined, causing text to reflow on a different system; low-resolution logos pulled from a website instead of the original vector file; artwork built to the wrong die-line because the component changed after the design was finalized; RGB color files that print far duller or brighter than expected; and missing bleed or safety margins that cause text to be trimmed off at the edge. Building in a short internal review — comparing the file against the factory's spec sheet before sending — catches most of these before they reach the printer.
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FAQ
Frequently asked questions
What file format should I send for cosmetic packaging artwork?
Most Thai printers prefer vector files such as Adobe Illustrator (.ai) or print-ready PDF, with fonts outlined and colors specified in Pantone or CMYK rather than RGB. Confirm the exact preference with your factory contact before finalizing the design.
Who provides the die-line for the packaging?
Ideally the factory or component supplier provides the technical die-line based on the actual mold or component drawing. Building a die-line from approximate measurements is a common cause of mismatched labels.
Does the factory check regulatory compliance on my label?
A factory can usually confirm whether space is reserved for required elements like batch coding, but final regulatory wording depends on your destination market — it's best to check with the customs or regulatory authority in your own country.
How many proofing rounds should I expect before approval?
This depends on the complexity of the design and how closely the first file matches the spec. Confirm the proofing process and any revision rounds directly with the factory when you send the artwork for review.
Prepared by the Thai Cosmetic Factory team for informational purposes. Some links may lead to referred partners.
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