Figure resolution for publication: 300 DPI, explained
"300 DPI" is the most misunderstood number in manuscript submission. It is not a property of a file — it is a relationship between a file's pixels and the size it will be printed. This page explains the relationship, the different numbers for photos vs line art, and how to check every panel before a production editor does it for you.
The one formula that matters
Effective DPI = panel width in pixels ÷ printed width in inches. A panel that is 1200 px wide sounds high-resolution — printed across a double column (183 mm ≈ 7.2 in) it delivers 1200 ÷ 7.2 ≈ 167 DPI, and it will be flagged. The same panel in a single column (89 mm ≈ 3.5 in) delivers ≈343 DPI and passes. Resolution is judged per panel, at its final printed size — never for the figure as a whole and never on screen.
What journals actually require
| Photographs & images (halftone) | 300 DPI at final size is the near-universal floor (Nature asks ≥300, noting 450+ looks best online; PLOS ONE asks 300–600). |
|---|---|
| Line art (graphs, plots) | Vector formats (PDF, SVG, EPS) are preferred wherever possible — they have no DPI at all. As raster, journals typically want 600–1200 DPI, because thin lines and small text alias badly at 300. |
| Combination (photo + lines/text) | Usually 450–600 DPI raster, or vector with embedded images at ≥300 DPI. |
| Screen exports | 72–150 DPI. Fine for slides and preprints' quick checks; never acceptable as final journal art. |
How to check a panel in ten seconds
- Find the panel's pixel width (image properties, or your plotting tool's export settings).
- Divide by its printed width in inches:
px ÷ (mm ÷ 25.4). - Below 300 for a photo, or below ~600 for rasterised line art? Re-export that panel at a larger size — enlarging the file afterwards only interpolates; it does not add real resolution.
- Repeat per panel. The weakest panel sets the figure's fate, and in a multi-panel figure the small panels tucked into a grid are usually the offenders.
Why "just export the whole figure at 1200 DPI" is not the fix
Composing a figure from low-resolution panels and exporting at 1200 DPI produces a large, sharp-edged file whose panels are still soft — the export DPI describes the canvas, not the content. Journals measure the content. The fix is upstream: export each panel at the size it will print (or as vector), then compose. A good figure tool reports each panel's effective DPI at its placed size and warns you about the weak ones before you submit.
In Data Figure Studio, the built-in figure quality check measures every panel's effective DPI at its printed size and flags anything under 300 — alongside axis alignment, label size and margin checks drawn from published top-journal figures. Exports run to 300, 600 or 1200 DPI, plus true vector SVG/PDF for line art. Images never leave your device.
Pricing: free preview and 100 DPI PNG export · Manuscript pack $7 (12 figures) · Researcher annual $79 · Lab annual $249. One credit exports one figure in any format; re-exports of the same figure are free for 24 hours.
More guides: Journal figure requirements · How to combine graphs into one figure · Assembling figures vs illustration tools · Back to the studio