In short
- CMYK
- resolution 300 dpi
- bleed 2 mm
- content margin min. 3 mm from the cut line
- black should be C:0 M:0 Y:0 K:100
- grey is e.g. C:0 M:0 Y:0 K:60
- fonts converted to curves
- no ICC colour profiles
- PDF version 1.3 (Acrobat 4.0)
Dimensions
Trim size
The size after trimming equals the format entered in the calculator (width, height), e.g. 210 x 297 mm
Cover size according to the template (after the calculation is made, a button for generating the cover appears)
Document size
The design must be enlarged by the bleed, i.e. by 2 mm on each side relative to the trim size. E.g. 214 x 301 mm. If any objects extend beyond the design area, they must be cropped.
Note!
Even if your design does not have a background extended into the bleed, the document size must be maintained. Therefore, the document size should be defined by a rectangle with the design dimensions on the lowest layer, with no outline and no fill, or (in the case of a raster file) the design should be cropped so that it has the correct dimensions.
Bleed
The background and all objects adjacent to the edge of the piece must be extended into the bleed beyond the trim edge. For this job the bleed is always 2 mm on each side.
Graphics
Colour model
The job must be prepared in the CMYK model. If the design contains raster images (textures, photographs), they must also be converted to CMYK. 
To obtain a full, deep black, use the components C0, M0, Y0, K100 (does not apply to texts)
Do not use gradients down to values lower than 5%.
Add noise to gradients to avoid banding.
Optimal resolution
The optimal resolution for raster graphics and photos is 300dpi.
Placement of objects
Important objects (photos, graphics, texts) must not be placed closer than 3 mm to the edge of the trim size and to fold lines (creases, folds).
When rotating the design by -90 degrees, check whether bitmaps rotate correctly.
Place all texts on a separate (top) layer.
When saving as CDR, group the design and convert fonts to curves.
In the file, define a page size matching the above-mentioned document size and place the design centrally on the page.
Due to cutting tolerance, the design may shift slightly relative to the trim edge. Therefore we advise against placing any kind of frames around the design, as their off-centre position on the piece may be visible. In such a case we recommend a margin of min. 5mm from the cut line.
Saving the file
File formats
Preferred: PDF (PDF 1.3, Acrobat 4.0)
Accepted: JPG, TIFF
Notes
If the design contains text, remember to convert it to curves or embed the fonts in the file (for PDF files) before saving.
Do not rasterize texts!!!
Prepare one file containing all pages of the book, including blank ones. If the book is saved in parts, number the individual files in ascending order (e.g. 01.pdf, 02.pdf, 10.pdf) and then pack them with ZIP into a single file. We recommend numbering the pages in publications.
When saving as TIFF, save the file as a single layer, without additional alpha channels.
For complex designs containing many layers, overlapping graphics, shadows, transparencies etc., flatten them as far as possible into a single background image, keeping texts, logos, lines and other important design elements in vector form.
Additional information
Please note that colours may differ from prints made on inkjet printers and from the image displayed on a monitor, due to differences in printing technology and colour presentation.
Designing in Canva? See our guide how to prepare print files in Canva — dimensions with bleed, PDF export and the most common mistakes.
