PDF Preflight FreeCatch print problems before the printer does.

Preflight is the check a print shop runs before printing: are the fonts embedded, are the pictures sharp enough at their size, are the colours right for the press, is there bleed where the artwork reaches the edge, and so on. This tool runs those checks and marks every problem on the page.

No. The PDF is read, checked and fixed in your browser and never leaves your device. Only the PDF report downloads open fonts once, so it can print text in any language.

As effective resolution: an image’s pixels divided by the size it is placed at on the page. A 3000-pixel photo placed 10 inches wide has 300 ppi; the same photo placed 20 inches wide has 150 ppi.

Offset for commercial CMYK printing (strictest), Digital for print-shop and office digital presses, Book printing for book interiors, Large format for posters and banners viewed from a distance, and Web / screen for PDFs that are only read on screens. Every limit can be changed in Settings.

It follows the rules common to print-on-demand services such as Amazon KDP and IngramSpark: a fixed trim size, 0.125 in (3.2 mm) bleed on the top, bottom and outside edges, text at least 0.25 in from the edges, and an inside margin from 0.375 in to 0.875 in depending on the page count. Always check your service’s current requirements.

It adds up the C, M, Y and K values of every colour in the file and of CMYK pictures (averaged over about a square millimetre). It doesn’t simulate overprinting or transparency, which can add more ink where objects overlap, and it doesn’t measure RGB content, which gets its ink only when converted.

It can set trim and bleed boxes, add bleed (blank, or with the artwork mirrored at the edge), resize pages to a trim size, flatten annotations and form fields into the page, and delete hidden layers. It does not convert colours, increase image resolution or embed missing fonts: those need the original design file.

It reads PDF/X and PDF/A claims and output intents and tests the main PDF/X rules (embedded fonts, output intent, trim boxes, no RGB in PDF/X-1a, no transparency in PDF/X-1a and X-3). It is not a certified PDF/X validator.

Yes. No sign-up, no watermark and no page limit. Very large files are limited only by your device’s memory.