How to Make a Half-Drop Repeat in Illustrator (Step by Step)

To make a half-drop repeat in Illustrator, select your motifs, choose Object > Pattern > Make, set Tile Type to Brick by Column with a Brick Offset of 1/2, then click Done. Every other column now drops by half a tile height, which is exactly what a half-drop is. For a printer, export a rectangle two tiles wide and one tile tall: that block repeats straight and still reads as a half-drop.

What a half-drop repeat is, and why it is worth the extra step

In a block (straight) repeat, the tile sits on a plain grid, so every motif lines up in rows and columns. In a half-drop, each second column slides down by half the tile height. The eye stops reading stripes and starts reading an all-over surface, which is why so many dress prints, florals and wallpapers use it.

If you are still choosing between layouts, read half-drop vs block repeat first, and see the side-by-side diagrams in half-drop, half-brick and straight repeats explained visually. One naming trap to know before you start: a half-drop moves columns vertically, while a half-brick moves rows sideways. In Illustrator that is the difference between Brick by Column and Brick by Row.

Set the tile size before you draw anything

Decide the finished repeat size in centimeters or inches first, because that number drives your file size later. Ask your printer whether they have a maximum repeat height or a fixed print width. A digital printer usually accepts a wide range of sizes; a rotary or flatbed screen printer will give you hard limits.

Then set up a document in real units:

• Use an artboard larger than the tile so you have room to work around the edges.
• Draw a guide rectangle the exact size of one tile, for example 30 x 30 cm. Give it no fill and no stroke once you are done placing motifs.
• Keep motifs as grouped vector objects. Text should be outlined before you build the swatch.

Method 1: the Pattern Options panel (fastest)

Adobe documents these steps on its Edit patterns help page. The field names below match that page.

1. Select the artwork for the tile and choose Object > Pattern > Make. Illustrator enters pattern editing mode and adds the new pattern to the Swatches panel.
2. In the Pattern Options panel, type a name you will recognize later, such as "Rose half-drop 30cm".
3. Set Tile Type to Brick by Column. This is the column-based brick layout, Illustrator's half-drop.
4. Set Brick Offset to 1/2. Other fractions give a third-drop or quarter-drop if a brief asks for one.
5. Untick Size Tile to Art and type the exact Width and Height you chose, so the repeat matches your spec rather than the bounding box of your motifs.
6. Tick Move Tile with Art if you want the tile to follow the motifs when you reposition them.
7. Set Copies to 5 x 5 and lower Dim Copies to so you can see how the drop reads across a wider area. Turn on Show Tile Edge while you work.
8. Move motifs across the tile edges. Illustrator repeats them in the copies, and the Overlap setting decides which tile sits on top where motifs collide.
9. In the bar below the Control panel, choose Done, or Save a Copy to keep the original pattern too.

To edit the swatch later, select it in the Swatches panel to reopen the Pattern Options panel, change the settings, and click Done again.

Method 2: build the half-drop by hand

The by-hand method is slower, but it gives you a master file any printer can tile without knowing what a half-drop is. It works in any version of Illustrator.

1. Draw tile A at your repeat size, say 30 x 30 cm, and arrange the motifs inside it.
2. Select everything in tile A and use Object > Transform > Move with a horizontal distance of 30 cm and a vertical distance of 15 cm. Click Copy. That is tile B, dropped by half.
3. Tile B now sticks out 15 cm below the bottom edge. Copy whatever hangs below and move it up by 30 cm so it fills the gap at the top of tile B.
4. Any motif crossing the left or right edge of the 60 x 30 cm rectangle needs a twin on the opposite side, moved by exactly 60 cm. Any motif crossing the top or bottom needs a twin moved by exactly 30 cm.
5. Draw a 60 x 30 cm rectangle, select it with the art, and drag the whole set into the Swatches panel. Illustrator uses the bottom-most unfilled, unstroked rectangle as the tile boundary, so put that rectangle at the back.

The result is a two-column block whose straight repeat produces a half-drop. Most seam faults in hand-built repeats come from a twin moved by the wrong distance, so type the values rather than dragging.

The classic half-drop seam errors and how to fix them

• Motif cut off at the tile edge. In Method 2 a motif crossing an edge was not duplicated. Add its twin at exactly one tile width or height away.
• Motifs bunching where columns meet. The drop moves your quiet areas next to your busy ones. Fill gaps in the copies, not just in the main tile.
• Repeat size drifts. Size Tile to Art was left on, so a stray point or a wide stroke changed the tile. Set Width and Height by hand.
• Thin lines at the joins. On screen these are often a display artifact. Judge seams in an exported image viewed at 100%, not in a zoomed-out preview.
• Visible diagonal tracks. Large, evenly spaced motifs line up along the diagonal in any half-drop. Vary their size and rotation, or add a smaller filler motif.

Export the repeat at the right size for printing

For digital textile printing you usually send a raster file. Fill a rectangle of exactly 2 x tile width by 1 x tile height with your pattern (60 x 30 cm in the example), fit an artboard to it, then choose File > Export > Export As, pick TIFF, and tick Use Artboards. In TIFF Options set Color Model to what your printer asks for, set Resolution, and use LZW Compression, which Adobe describes as lossless. Adobe lists these options on its export artwork page.

Pixel size is simply inches multiplied by DPI. The table shows what you get for common tile sizes:

Ask the printer which DPI they want before you export. If you are unsure what the number means on cloth, our DPI explainer covers it.

Half-drop repeat in Photoshop

Photoshop's View > Pattern Preview shows a straight repeat of the canvas, so for a half-drop you build the same two-column block as in Method 2:

1. Make a seamless single tile first, for example 3,543 x 3,543 px for 30 cm at 300 DPI.
2. Use Image > Canvas Size to double the width, anchored on the left.
3. Duplicate the tile layer and move it into the empty right half.
4. On that duplicate, run Filter > Other > Offset with a vertical value of half the tile height (1,772 px here), horizontal 0, and Wrap Around, which fills the gap with content from the opposite edge.
5. Check the joins with Pattern Preview, then choose Edit > Define Pattern if you want it as a preset.

Which method should you use?

If your starting point is a raster image whose edges do not meet, the Half Drop mode of Texloom's Seamless Pattern Maker blends the seams so the tile repeats with a 50% column offset. The canvas preview shows 2 x 2, 3 x 3 or 4 x 4 copies before you download.

Check it before it goes to the mill

Whatever you used, test the exported file once more. Load it into the free Seamless Tile Checker, switch the layout to Half Drop if you are sending a single tile, or to a straight grid if you are sending the two-column block, and inspect every join at 3 x 3. A seam you catch here costs a minute; one you catch on a strike-off costs fabric.

Next step: take one motif you already have, build it with Brick by Column at 1/2, export the 2-tile block at your printer's DPI, and run it through the checker before you send anything.