What is the maximum file size Printster accepts?

Printster's direct upload accepts files up to 100 MB. For larger files, share via WeTransfer and provide the download link when placing your order.

Will compressing my PDF reduce the print quality?

Compressing to 300 DPI from a higher resolution has no visible impact on print quality — commercial printers do not benefit from resolutions above 300 DPI. Using a 'print quality' preset in a PDF compressor is safe.

How long does WeTransfer keep files available?

WeTransfer's free plan keeps files available for 7 days. Make sure you share the link promptly after creating your order so Printster can download the file before it expires.

I have a 400-page book PDF at 150 MB — what should I try first?

Try PDF24 or Adobe Acrobat's print-quality optimisation preset. Downsampling embedded images to 300 DPI typically reduces a 150 MB PDF to well under 100 MB. Check the compressed file looks correct in a PDF viewer before uploading.

Can I upload multiple files for a single print job?

Yes. Upload multiple files and add them all to a single cart. You can also ZIP image files together and upload the archive as one item.

What file format gives the best print result for large documents?

PDF with embedded fonts is always the preferred format. It preserves layout, fonts and image quality precisely, regardless of which software created the document.

Large File (100MB+) Printing

Printster accepts files up to 100 MB directly via the upload page. For files larger than 100 MB — such as high-resolution PDFs with many pages or large images — share the file via WeTransfer and include the download link when placing your order.

Large files are common in print-heavy workflows. A 500-page thesis with embedded high-resolution images, an architecture portfolio, a scanned book, or a set of engineering drawings can easily exceed 100 MB. While Printster's direct upload supports files up to 100 MB, you do not need to compromise on quality or image resolution to place an order. This guide explains the options available for large files, how to reduce file size without visible quality loss, and what to do when compression alone is not enough. The goal is to get your file to print at full quality — not to force you into a workaround that degrades the output. Printster accepts PDF, DOCX, DOC, PPT, PPTX, JPG, PNG and ZIP formats. For large jobs, PDF with embedded fonts gives the most reliable and predictable printed result.

Option 1 — Compress the PDF First

For most documents, intelligent compression brings the file well under 100 MB without any visible change in print quality. A few reliable approaches:

PDF24 or Smallpdf online compressor — these free tools reduce file size by optimising image compression within the PDF. Use the 'recommended' or 'print quality' preset, not the most aggressive setting.
Adobe Acrobat Pro — File > Save As > Optimised PDF > choose 'Press Quality' or 'Print Quality'. This gives fine control over image downsampling.
Reduce embedded images to 300 DPI — anything above 300 DPI for print is invisible to the eye and adds file size. Downsampling to 300 DPI in Acrobat or InDesign is the single most effective way to reduce large PDFs.
Flatten transparency and remove unused data — documents created in Illustrator or InDesign often contain hidden layers and embedded resources that are not visible in print; removing them reduces size.

Option 2 — Use WeTransfer for Files Over 100 MB

If compression reduces visual quality or the file still exceeds 100 MB, use WeTransfer (wetransfer.com) to share the file:

Go to wetransfer.com and upload your file.
Send the transfer to yourself or simply generate a download link.
Place your order on Printster and include the WeTransfer link in the order notes or the file upload field.

WeTransfer's free plan supports files up to 2 GB. Files are available for seven days, which is more than enough time to process your order.

Splitting Large Documents

For very large documents — over 500 pages — splitting the file into two or more parts before uploading can also help. Ensure the page range in each file is clearly labelled in the filename (e.g., thesis-pages-001-250.pdf). When you place the order, note that the files belong together.

Zip Archives for Multiple Files

If you have a large number of images (JPG or PNG) that together form your document, compress them into a ZIP archive. Printster accepts ZIP files and will process the images inside. Ensure the images are named in the correct print order (e.g., 001.jpg, 002.jpg) so the page sequence is correct.

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Frequently asked questions

What is the maximum file size Printster accepts?: Printster's direct upload accepts files up to 100 MB. For larger files, share via WeTransfer and provide the download link when placing your order.
Will compressing my PDF reduce the print quality?: Compressing to 300 DPI from a higher resolution has no visible impact on print quality — commercial printers do not benefit from resolutions above 300 DPI. Using a 'print quality' preset in a PDF compressor is safe.
How long does WeTransfer keep files available?: WeTransfer's free plan keeps files available for 7 days. Make sure you share the link promptly after creating your order so Printster can download the file before it expires.
I have a 400-page book PDF at 150 MB — what should I try first?: Try PDF24 or Adobe Acrobat's print-quality optimisation preset. Downsampling embedded images to 300 DPI typically reduces a 150 MB PDF to well under 100 MB. Check the compressed file looks correct in a PDF viewer before uploading.
Can I upload multiple files for a single print job?: Yes. Upload multiple files and add them all to a single cart. You can also ZIP image files together and upload the archive as one item.
What file format gives the best print result for large documents?: PDF with embedded fonts is always the preferred format. It preserves layout, fonts and image quality precisely, regardless of which software created the document.