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About this tool
Work out bleed, trim, safe margin and slug sizes for any print job in mm, inches, points and pixels at your chosen DPI.
The Print Bleed Calculator turns a finished trim size into every box a press-ready document needs: artboard, bleed, trim, safe area and slug, given in millimetres, inches, PostScript points and pixels at your chosen resolution. It applies the rules directly — document size = trim + 2 × bleed, safe area = trim − 2 × safe margin, and pixels = inches × DPI, with 1 inch fixed at exactly 25.4 mm. Presets cover the ISO 3 mm and US 1/8 inch bleed standards and the common A-series, DL, Letter and business-card trim sizes.
Open Print Bleed Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Millimetres, inches, points and pixels for each box, so the same setup works in any application.
3 mm ISO and 1/8 inch US bleed presets, plus ISO 216 and North American trim sizes.
Warns about zero bleed, a safe margin narrower than the bleed, and resolutions below the 150 DPI print floor.
3 mm on every edge is the standard for European and ISO commercial print; North American printers usually specify 1/8 inch, which is 3.175 mm. Large-format and packaging work sometimes asks for 5 mm. Bleed is added to all four sides, so a 210 × 297 mm A4 flyer becomes a 216 × 303 mm document at 3 mm bleed.
Trim is the finished size after cutting. Bleed is artwork extended past the trim so a cut that drifts by a fraction of a millimetre cannot leave a white edge. The safe area is an inset inside the trim — usually 3 to 5 mm — where text and logos must stay so the same drift cannot clip them.
A4 is 210 × 297 mm, which is 8.268 × 11.693 inches, so at 300 DPI the trim size is 2480 × 3508 pixels. Add 3 mm bleed on each side and the document you actually build becomes 216 × 303 mm, or 2551 × 3579 pixels at the same resolution.
Not strictly — if nothing is meant to reach the edge, there is nothing to bleed. But most printers still want the file supplied at the bleed size with crop marks so the imposition and cutting are consistent, and adding bleed costs nothing. Check the specification the printer supplies before deciding.
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