A three-panel brochure that tucks one panel inside may need that inner panel to be slightly narrower. Dividing the sheet into three mathematically equal columns can make the folded object bunch up. Confirm the fold construction and supplier template before changing the artwork or forcing the paper flat.
Identify the fold, not just the panel count
“Trifold” is sometimes used loosely for different three-panel objects. An inward-tucking letter fold and a Z fold do not close in the same way. Draw the opening sequence and identify which panel, if any, goes inside another.
Hopkins Printing explains that its standard tri-fold uses two equal panels and one smaller panel to avoid bunching. Its published templates specify the widths for its products. That supports asking for an actual panel template; it does not establish a universal amount to subtract from every sheet. Hopkins Printing: Folding templates.
Map the sides before placing images
Use a blank paper dummy and write Front, Back and Tuck on the intended physical faces. Open it fully and transfer those labels to the corresponding working layout. Mark the top edge on both sides so that the second side is not accidentally treated like a duplicate of the first.
For a fictional craft-market leaflet, the cover introduces the maker, the first revealed panel gives a short invitation and the fully opened interior shows the collection. Keep that sequence readable rather than arranging six attractive images without deciding when the reader sees them.
Test the mechanical fit separately
The following is a proposed review method, not an executed production test. Use the supplier's panel widths to make a rough dummy in the intended proportions. Fold it in the planned order without trimming away a problem after the fact.
Record whether the tuck panel enters cleanly, whether the cover closes without bowing and whether a fold crosses essential text. A plain-paper dummy helps with mapping and obvious geometry, but does not certify the behavior of the final heavier stock. Ask for an appropriate scored or folded sample when the material makes that relevant.
Adapt artwork to each panel
Place approved images in the updated panel frames without stretching faces or converting the entire sheet into one distorted image. Keep text editable. If a panorama crosses folds, inspect its reading at each opening state as well as when fully flat.
Use a six-face map with a note for each face: physical role, reading order and required content. Pass when the map, supplier widths and folded sample agree. Fail if the inward panel collides, a key instruction is hidden until too late, or reversing the sheet changes the intended front.
Imagild can help create the leaflet's visual artwork. Exact panel construction, scoring and physical folding belong to the external layout and print workflow. A realistic folded mockup is not evidence that the flat production file has workable panel widths.