The reasons an online print order gets rejected are surprisingly predictable. Most problems come down to three things — finished size, bleed, and image resolution — with fonts, color mode, and trim marks rounding out the list. Checking a handful of items before you submit dramatically lowers your risk of a reprint. This article lays out the 8 things to verify, as a checklist.
Pre-submission checklist (8 items)
| # | Check | Target | Verifiable in-browser |
|---|---|---|---|
| 1 | Finished size | Matches your order (A4 = 210×297mm, etc.) | ✓ Yes |
| 2 | Bleed | 3mm on all four sides | ✓ Yes |
| 3 | Image resolution | 350dpi effective or higher | ✓ Yes |
| 4 | Text safety margin | At least 3mm inside the trim line | △ Visual check |
| 5 | Font embedding | All fonts embedded or outlined | ✗ Needs a dedicated tool |
| 6 | Color mode | CMYK (RGB can look dull) | ✗ Needs a dedicated tool |
| 7 | Trim marks / TrimBox | Finished position defined | ✓ Indirectly, via size check |
| 8 | Pages, order, stray elements | As ordered, no unwanted layers | △ Visual check |
TL;DR: (1) size, (2) 3mm bleed, (3) 350dpi resolution can all be checked in your browser. Leave font embedding and CMYK to Adobe Acrobat Pro or your printer's preflight to be safe.
The three pillars: size, bleed, resolution
The vast majority of submission failures come from these three. Lock them down first and your rejection rate drops sharply.
1. Finished size
Confirm the PDF's actual page size matches the size you ordered. A file that's Letter (216×279mm) when you meant A4, or portrait when you meant landscape, gets auto-scaled at print time, producing unexpected margins or cropping.
2. Bleed
Bleed is the extra area (typically 3mm on all four sides) where you extend the background or image beyond the finished size. Prints are stacked and trimmed in bulk, so the cut shifts slightly. Without bleed, that shift exposes a white edge of bare paper.
Inside the PDF, bleed is the gap between the "finished position" (TrimBox) and the "data edge" (MediaBox). A gap under 3mm is worth a second look.
3. Image resolution
Check that placed photos and logos have an effective resolution of 350dpi or higher at print size. Images that look fine on screen — like a 72dpi graphic pulled from the web — go blurry the moment they hit paper. What matters isn't the source resolution but the effective resolution at the placed size: scaling a small image up lowers it.
The concept of resolution itself is covered in depth in our 72 / 150 / 300 / 600 DPI guide. That article is about which DPI to export at; a print check is the reverse — whether the already-placed images can survive printing.
The remaining 5 items: easy-to-miss points
| Item | What to verify | What goes wrong |
|---|---|---|
| Text safety margin | Important text sits ≥3mm inside the trim line | Text gets cut off at trimming |
| Font embedding | All fonts embedded or outlined | Garbled text or substituted fonts |
| Color mode | File is CMYK (not left in RGB) | Colors look dull or muted |
| Trim marks / TrimBox | Finished position is defined | Size can't be judged → rejected |
| Pages & stray elements | Page count/order as ordered, no extra layers | Missing pages or unintended elements printed |
Of these, font embedding and color mode (CMYK/RGB) can't be judged precisely by a browser-only check. The next section is honest about that.
What a browser can and can't check (honestly)
PDFnite's print check runs entirely in your browser (files are never sent to a server). It verifies the three pillars above — size, bleed, and image resolution.
What it cannot do is judge the color side: CMYK/RGB color space, ICC profiles, total ink coverage (TAC), and overprint. For jobs where those matter, pair it with the industry standard Adobe Acrobat Pro, or your printer's preflight / a paid professional service.
| Method | PDFnite (browser) | Adobe Acrobat Pro (industry standard) | Printer preflight / paid professional services |
|---|---|---|---|
| Cost | Free | Paid (subscription) | Paid or bundled with submission |
| Size, bleed, resolution | ✓ Automatic | ✓ Detailed | ✓ |
| CMYK / ICC / ink coverage / overprint | ✗ Not supported | ✓ | ✓ |
| Processing location | On-device (no upload) | On-device | Printer's server |
| Best for | Quick pre-submission sanity check | Rigorous pre-check | Final sign-off, color proofing |
In short: clear out size/bleed/resolution slip-ups in the browser right before submitting, and leave the final color review to a dedicated tool — a practical two-step workflow.
How to run a print check in PDFnite
- Open the print check page
- Drag & drop the PDF you want to check (the finished size and recommended resolution are auto-detected from the PDF)
- Adjust the finished size, bleed threshold (default 3mm), or resolution threshold (default 350dpi) as needed
- Click Run check
- See the results for size, bleed, and image resolution, each with a short tip
If images push you over the submission size limit, pair it with PDF compression; to lay out multiple pages per sheet use N-up; to rebuild from images use Image to PDF — together they cover the whole prep workflow.
If you'd rather learn from concrete failures, see 7 Common Online Printing Submission Mistakes.
Frequently Asked Questions
How much bleed do I need?
3mm on all four sides is standard for most online printers. Some special sizes or bound products require more, so always defer to your printer's specs. PDFnite lets you change the bleed threshold for the check.
What resolution avoids pixelation in print?
Aim for 350dpi or higher at print size. Flyers and brochures are fine at 300–350dpi; business cards and anything with fine text are safest at 350dpi. Large-format items viewed from a distance (signs, big posters) are fine around 150dpi. See the DPI guide for use-case details.
Can it check CMYK/RGB color?
No. A browser-only check can't reliably judge color space (CMYK/RGB), ICC profiles, ink coverage, or overprint. Use Adobe Acrobat Pro, your printer's preflight, or a paid professional service for those. The size/bleed/resolution check works well as a quick pre-submission pass alongside them.
Are trim marks required?
Many online-printer templates don't need trim marks, but if the finished position (TrimBox) isn't defined, bleed can't be measured automatically. Export from your design software with trim marks and bleed to be safe.
Are my files sent to the printer or anywhere else during the check?
No. PDFnite's print check runs entirely in your browser. Your files never leave your device.
Summary
Most submission failures boil down to three things: (1) size, (2) 3mm bleed, (3) 350dpi resolution. Clear those in the browser first, and leave the precise color checks — font embedding, CMYK — to Adobe Acrobat Pro, your printer's preflight, or a paid professional service. That two-step approach is the fastest way to avoid rejections and reprints.