Assembling Figure 1 — panel labels, alignment, sizing, and how to do it without spending an afternoon nudging boxes in Illustrator.

Most papers don't present results one chart at a time. They group related plots into a single composite figure — Figure 1, Figure 2 — with panels labeled A, B, C, D. Getting that layout clean, aligned, and sized to your journal's column width is one of the most tedious parts of preparing a manuscript. This guide covers how to do it properly.

What a multi-panel figure is

A multi-panel figure is a single composite image that arranges several related plots into one labeled layout. Each sub-plot is a "panel," labeled with a letter (A, B, C…), and the whole thing is sized to fit the journal's column or page width. The goal is to tell one coherent visual story: the panels should read in a logical order and share consistent styling.

What journals expect

Before you assemble anything, check your target journal's figure guidelines. Most specify:

Column width — single-column (often ~89 mm) or double-column (~183 mm). Your figure must fit one of these exactly.
Resolution — typically 300 DPI minimum for print, sometimes 600+ for line art.
File format — TIFF, EPS/PDF (vector), or high-resolution PNG.
Panel labels — usually bold capital letters (A, B, C), positioned consistently (commonly top-left of each panel).
Font and size minimums — text must remain legible at final print size.

Designing to these specs from the start saves a painful re-do at revision.

Step-by-step: assembling a multi-panel figure

Step 1 — Plan the story. Decide the order your panels should be read in, and group related ones. A reader should move through A → B → C → D and follow your argument. Sketch the arrangement before you build.

Step 2 — Make each panel consistent. Before combining, ensure every panel shares the same font, font sizes, color scheme, and line weights. Inconsistent panels are the most common reason a composite figure looks amateurish.

Step 3 — Choose a grid. Most figures use a simple grid (2×2, 3×2, 1×4). Pick the layout that fits your panel count and the journal's aspect ratio.

Step 4 — Align everything. Panels should align on a shared grid — tops, edges, and baselines lined up. Uneven spacing and misaligned panels are immediately visible to reviewers and editors.

Step 5 — Add panel labels. Place bold letters (A, B, C…) in a consistent position on each panel. Keep them the same size and font throughout.

Step 6 — Size and export to spec. Set the total figure to the journal's column width, confirm text is legible at that size, and export at the required resolution and format.

Tools for assembling figures

Adobe Illustrator / Inkscape — total control, but slow and manual; you align every panel by hand.
PowerPoint — accessible but not built for precise alignment or publication-grade export.
FigureGuild — its Figure Assembler is built specifically for this: drag panels into a grid with auto-alignment, automatic A/B/C/D labeling, and journal presets (Nature, Cell, Science, eLife) that set column width and export resolution for you.

The fast way with FigureGuild

Build or import your individual charts (the Graph Builder makes bar, box, scatter, survival, and other plots from your raw data — it also runs the right statistical test automatically).
Open the Figure Assembler and drag panels into a grid layout.
Panels auto-align and get A/B/C/D labels automatically.
Pick a journal preset to set the column width, then export to PNG, PDF, SVG, or TIFF at 300–1200 DPI.

Try the Figure Assembler free at figureguild.com.

Common mistakes

Inconsistent panel styling — different fonts or colors across panels.
Misalignment — panels not sharing a grid.
Wrong final size — designing without checking the journal's column width.
Tiny text — labels illegible at print size; always check at final scale.
Inconsistent label placement — letters in different positions per panel.

Final thought

A clean multi-panel figure is mostly about consistency and alignment: same styling across panels, everything on a shared grid, sized to your journal's spec. Whether you assemble it by hand or use a tool that automates the alignment and labeling, the principles hold — plan the story, keep it consistent, design to spec.

FigureGuild helps researchers build plots and assemble multi-panel figures from raw data, with journal export presets. Free to try.