How to combine multiple graphs into one publication figure
A multi-panel figure is not a collage. Journals judge it on aligned axes, one consistent type size, and panels that share a scale. Here is the workflow that gets a figure accepted without a production-editor round-trip — and the mistakes that send figures back.
The workflow
- Start from the journal's column width. Decide single or double column first (Nature: 89 / 183 mm; Science: ≈57–184 mm; Cell Press: 85–174 mm — see the journal guides). Every later decision — font size, line weight, panel size — depends on the final printed width, because panels are judged at final size, not on your screen.
- Collect panels at a consistent scale. Export each plot or image at roughly the size it will print. A panel exported huge and shrunk to fit ends up with hair-thin text; one exported small and enlarged goes soft. Mixed source sizes are the root cause of most "inconsistent figure" complaints.
- Trim dead margins. Plotting tools pad every export with white space, and the padding differs per panel. Trim it, or the panels can never line up — you would be aligning the padding, not the data.
- Align the plot areas, not the image edges. What must line up across a row is the axes: the y-axis spines share one x position, the x-axes share one baseline, and plot areas share one width. Edge-aligned images with different internal margins still look scattered, because the axes inside them wander.
- Use one label system, on a grid. One label per panel — a, b, c for Nature-style journals, A, B, C for Science-style, (A), (B), (C) for Cell Press — all the same size (usually 8 pt), placed on a strict grid so labels line up down columns and across rows even when the panels beneath them are inset by their axes.
- One font size for everything. After scaling, axis text across all panels should land at the same final size (typically 5–7 pt, labels 8 pt). If one panel's tick labels are visibly larger, that panel was exported at a different scale — fix the panel, not the figure.
- Export at the journal's resolution. 300 DPI at final size is the floor for photographs and plots; vector formats (PDF/SVG) sidestep DPI entirely for line art. Check each panel's effective DPI at its printed size — a 1200-pixel panel printed at 183 mm is only ≈167 DPI, however sharp it looks zoomed in. More in the resolution guide.
The five mistakes that get figures sent back
| Misaligned axes | Panels aligned by their image edges while their internal plot areas differ — the classic screenshot-and-paste result. |
|---|---|
| Mixed font sizes | Each panel exported at a different scale, so tick labels print at 5 pt in one panel and 9 pt in the next. |
| Labels that wander | Panel labels glued to each image's corner instead of a shared grid, so they stagger when panels are inset. |
| Too-low effective DPI | Screen-resolution exports (72–100 DPI) submitted as final art; they pass on screen and fail in production. |
| Red/green encodings | Red–green pairings are unreadable to colour-blind readers; most journals now ask authors to avoid them. |
Data Figure Studio does steps 3–7 automatically: it trims white margins on import, aligns plot areas (not edges), puts panel labels on their own grid, and its built-in quality check audits the finished figure against ten criteria taken from published top-journal figures — including per-panel effective DPI. Images never leave your device; the studio runs entirely in your browser.
Pricing: free preview and 100 DPI PNG export · Manuscript pack $7 (12 figures) · Researcher annual $79 · Lab annual $249. High-resolution PNG / SVG / PDF / TIFF exports (300–1200 DPI) spend one credit per figure, with free re-exports of the same figure for 24 hours — built for revision rounds.
More guides: Journal figure requirements · Figure resolution & DPI, explained · Assembling figures vs illustration tools · Back to the studio