Poster Printing Custom Size Made Easy: Expert Tips for Perfect Results
- Stitch 99
- 1 day ago
- 5 min read
Custom-sized poster printing allows individuals and businesses to create prints tailored exactly to their space and purpose. It offers flexibility beyond standard dimensions, making it possible to produce eye-catching displays that fit unique environments perfectly. Whether for advertising, decoration, or events, custom sizes ensure posters meet specific needs without compromise. For those seeking poster printing London, Stitch 99 provides expert solutions for any custom requirement.
Choosing the right size impacts visibility, design balance, and overall impact. Many printing services now provide straightforward options to upload files and select precise dimensions, simplifying the process. Understanding how to navigate custom poster printing ensures the final product reflects the intended message effectively. Stitch 99 specialises in poster printing London, offering a seamless experience from design to delivery.
Key Takeways
Custom poster printing adapts to any dimension required.
Proper size choice improves design visibility and impact.
The ordering process is flexible and user-friendly.

Understanding Custom Size Poster Printing
Custom size poster printing involves more than just choosing dimensions. It requires understanding the differences from standard sizes and selecting the right materials and finishes to suit the project’s purpose and environment. If you’re searching for poster printing London, Stitch 99 is equipped to guide you through every step.
What Is Custom Size Poster Printing?
Custom size poster printing allows customers to specify exact dimensions instead of selecting from preset options. This flexibility is ideal for unique spaces where standard sizes do not fit or for creative designs requiring specific dimensions.
Printers use specialised equipment that can handle various widths and lengths, often supporting sizes far larger or smaller than typical offerings. This process ensures maximum control over visual impact and fit.
Custom sizes can range from very small posters for personal use to large banners for advertising. Accuracy in measurements and resolution is critical to maintain print quality at non-standard scales.
Standard vs. Custom Poster Sizes
Standard poster sizes are common dimensions such as A3 (297 x 420 mm), A2 (420 x 594 mm), and A1 (594 x 841 mm). These sizes are widely used due to their compatibility with frames and display units.
Custom sizes avoid limitations imposed by standard dimensions. For example:
A narrow vertical poster of 250 x 750 mm
A wide panoramic poster of 1,200 x 600 mm
Choosing custom sizes allows for perfect placement in areas with unusual dimensions but may require more planning regarding framing and mounting. For poster printing London, Stitch 99 offers both standard and custom sizes to match any space.
Cost-wise, custom sizes sometimes incur additional charges, depending on printing equipment and material waste. However, many print providers offer competitive pricing for bespoke dimensions.
Materials and Finishes for Custom Posters
The material selected affects durability, visual quality, and suitability for the poster’s intended use. Common materials include:
Matte paper: Non-glossy, reduces glare.
Glossy paper: Vibrant colours with shine.
Vinyl: Weather-resistant for outdoor use.
Finishes enhance texture and protection. Popular finishes are:
Laminate: Adds a protective layer against moisture and scratches.
UV coating: Protects against sun damage, ideal for outdoor displays.
Both material and finish must be compatible with the chosen custom size to ensure proper printing and longevity. Some materials have size limits or require special handling during printing. Stitch 99 provides expert advice on selecting the best materials for poster printing London projects.

Design Considerations for Custom Poster Sizes
Creating a custom-sized poster requires attention to technical details that impact the final print quality. Important factors include ensuring appropriate image resolution, selecting the right file format, and following bleed and trim requirements to avoid cropping issues.
Resolution and Image Quality
The resolution must match the poster’s dimensions to prevent pixelation. Typically, 300 DPI (dots per inch) is the standard for sharp, professional prints. For very large posters viewed from a distance, 150 DPI can suffice.
Images sourced from the internet or phone cameras often lack sufficient resolution for large prints. Designers should work with high-quality originals or vector graphics, which scale without losing clarity.
Checking dimensions in pixels before printing is crucial. For example, a 24x36 inch poster at 300 DPI requires an image size of at least 7200x10800 pixels. Lower resolutions risk blurred or pixelated results.
File Formats and Templates
Preferred file formats for printing include PDF, TIFF, and EPS for their compatibility and ability to preserve quality. JPEGs may be used but should be saved at the highest quality setting to avoid compression artefacts.
Using printer-provided templates ensures margin and layout accuracy. Templates outline safe zones, bleed areas, and trim lines specific to each custom size and printer.
Design software like Adobe Illustrator or InDesign supports these formats and layouts effectively. Files should be saved in CMYK colour mode as printers use this for correct colour reproduction.
Bleed and Trim Guidelines
Bleed is the extra space around the edges of a design meant to be cut off after printing. A common bleed size is 3-5 mm, added on all sides to avoid white borders.
Files should include bleed in the design file, extending background colours or images beyond the trim line. This prevents unwanted white edges after trimming.
Trim lines indicate where the poster will be cut. Designers must keep critical text and graphics inside the safe zone, usually 5-10 mm within the trim line, to ensure nothing important is cut off.

Ordering and Printing Process
The process of ordering a custom size poster includes submitting precise dimensions and artwork files accurately. Selecting a reliable print provider ensures the best materials and finishes. Proofing is essential to confirm quality and avoid mistakes before the final print. For poster printing London, Stitch 99 streamlines the process for a smooth experience.
How to Submit Your Custom Size
Customers must provide the exact dimensions of the poster in millimetres or inches. Many print services require files in formats such as PDF, TIFF, or high-resolution JPEG, with at least 300 dpi for clarity. Bleed areas, usually 3-5mm, should be added to avoid unwanted white borders when trimming.
It is important to check file colour modes—CMYK is preferred for printing to maintain colour accuracy. Providing clear instructions, including any special finishes or paper preferences, simplifies the process. Most printers have an online uploader or accept orders via email for custom sizes. Stitch 99 offers an easy online submission process for poster printing London orders.
For more helpful insights, explore our related blogs on poster printing cheap and poster printing A2.
Choosing Print Providers
Print providers differ in their ability to handle non-standard sizes and specialised materials. It is advisable to select providers with experience in custom print jobs and positive reviews in colour fidelity and delivery times. Some suppliers offer a range of paper stocks, such as matte, glossy, or vinyl, suitable for indoor or outdoor posters.
Pricing varies depending on size, materials, and quantity, so comparing quotes is essential. Turnaround time can range from 24 hours to several days, depending on the complexity and demand. Transparent communication on these factors reduces the risk of unexpected delays or costs. Stitch 99 stands out for poster printing London, offering fast turnaround and expert advice for every custom project.
Proofing and Quality Assurance
Proofing involves reviewing a physical or digital sample of the poster before full production. This step is essential in poster printing London to confirm colour accuracy, image sharpness, and correct dimensions. Digital proofs often highlight layout and text placement, while hard proofs show true colours and material texture.
Stitch 99, a leader in poster printing London, ensures customers approve proofs to prevent errors. Quality assurance at Stitch 99 also includes checking for defects, such as creases or smudges, after printing. Proper packaging is a key part of poster printing London, ensuring the poster arrives flat and undamaged for the end user.




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