Add Bleed to PDF

1. Select and measure

   Drop one PDF, up to 50 MB, or load a sample. Every page is inspected locally with no daily inspection cap.

2. Locate the risk

   Confirm trim dimensions, choose your target and click an issue or image row. The viewer changes page and frames its measured bounds.

3. Compare the proposal

   Change bleed amount, edge method or marks. Inspect four corners; original DPI, font, color and safety warnings remain available.

4. Choose the right file

   Download a limited proof or TXT sample. Production PDFs and full reports require Pro access and confirmed print specifications.

The trim rectangle is the finished object. Bleed is extra artwork outside that rectangle, allowing a small cutting deviation without revealing unprinted paper. For a 3.5 × 2 in card, a 0.125 in extension makes a 3.75 × 2.25 in bleed rectangle. The original card remains exactly 3.5 × 2 in.

This tool measures existing bleed on the left, bottom, right and top separately. A correct total width is insufficient if the trim is off-center or only one side has artwork. Missing BleedBox declarations are flagged rather than inferred as permission to print. The preview reports how much additional bleed the worst edge still needs.

Mirror reflects the adjacent source pixels into an absent band. Stretch repeats a narrow strip from the edge. Both are deterministic previews, and neither is equivalent to editing the original background intelligently. A portrait or barcode at an edge can become visually incorrect after either operation. The four corner loupes help expose repeated shapes.

Existing adequate bleed should not be added twice. The A6 reference begins at 105 × 148 mm trim and 111 × 154 mm bleed. At a 3 mm target, additional bleed needed is zero. Selecting 5 mm changes the proposal to 115 × 158 mm, while the source boxes and original measured findings remain distinguishable.

The US standard is slightly larger than 3 mm. One inch is 72 PDF points, so 0.125 in is 9 points. The metric target is 3 × 72 ÷ 25.4, approximately 8.504 points. Even a difference of 0.175 mm per edge matters when an upload portal checks page boxes numerically.

For an A4 brochure, preserve the 210 × 297 mm trim. Three-millimeter bleed requires 216 × 303 mm. Crop marks then need a further enclosing media area beyond the bleed, determined by the shop’s margin and mark geometry. A white enlarged border is not bleed, because it contains no continuation of the edge artwork.

Safe margin runs inward from trim; bleed runs outward. The brochure heading sits only 1.2 mm from trim, so a 3 mm safe target still warns after mirror extension. Increasing the outside paper area cannot change that clearance. Move the heading inside the source document, export again and check the revised location.

The KDP example is a full wrap: two 6 × 9 in panels plus a fixed 0.50 in spine. Its 12.5 × 9 in trim expands to 12.75 × 9.25 in with 0.125 in outer bleed. Real spine dimensions depend on the current printer template, page count and paper; this example does not calculate those values.

300 DPI: physical size to pixels

Pixels = millimeters ÷ 25.4 × 300, rounded to the nearest whole pixel. These dimensions refer to the trim, before adding any bleed. A different placement size changes effective DPI even when the underlying pixels are unchanged.

Bleed and safety: keep the directions separate

Bleed extends outward; the safe margin sits inward. The numerical targets below are inspection examples. A book cover, folded piece, bound page or large-format print must use its actual job template. KDP spine and safety requirements cannot be inferred from the example’s fixed dimensions.

Before the final handoff

For business cards and mailers, review the smallest type and border lines as well as the background edge. For folded brochures, include fold tolerances in the source layout. For a full book cover, verify the entire wrap and spine against the supplied template. These tasks share PDF geometry but have different finishing risks.

Use the print-ready PDF checklist and bleed guide for the cut, bleed and safe-area sequence. Use the color, font and hairline guide to interpret mixed objects, embedded programs and black-overprint requirements before authorizing a production repair.