Clear space is the minimum empty margin that must surround a logo. Minimum size is the smallest it may be reproduced while staying legible. Together they are the two rules that keep a mark intact once it leaves the designer and starts being placed by other people.
Clear space is usually defined as a proportion of the logo itself, so it scales automatically. A common rule is to reserve a margin equal to the height of a prominent letter or element in the mark, on all four sides, and to keep other elements, type and edges outside it.
Minimum size is set by the most fragile detail in the artwork. As a logo shrinks, its thinnest stroke shrinks with it, and once that stroke falls below roughly a pixel on screen or the limits of the printing process, it breaks up. The minimum size is the point just before that happens, stated separately for screen (in pixels) and print (in millimetres or inches).
Both should be measured from the real file, not copied from a template, because both depend on that specific artwork.
How do you calculate logo clear space?
Choose a unit from inside the logo itself, then apply it as a margin on all four sides. Using an element of the mark rather than a fixed measurement means the rule holds at every size: the clear space grows and shrinks with the logo automatically.
The point of the rule is not the exact number. It is to stop the logo being crowded by navigation, body text, photo edges or a competitor's mark in a partner lockup.
How do you determine minimum logo size?
Shrink the logo until something fails, then step back one stop. What fails first is predictable: fine strokes fill in or disappear, tight counters (the enclosed gaps in letters like a or e) close up, and small registration marks turn into specks.
| Where it is used | What sets the limit | State it as |
|---|---|---|
| Screen | Thinnest stroke falling below about one pixel | Pixels, at the smallest intended use |
| Ink spread and the press or paper limits | Millimetres or inches of width | |
| Favicon | Whether the mark survives at 16 or 32 pixels | Which arrangement to switch to instead |
| Embroidery and engraving | Thread and tool width | A larger minimum than print |
Why guessing these rules causes problems later
Both numbers depend on the artwork. A heavy geometric wordmark survives far smaller than a fine script with hairline serifs. Copying a minimum size from a template means it is either too conservative, so the logo is needlessly large, or too optimistic, so it is illegible on the one surface nobody checked.
This is measurable rather than a matter of taste. Logofai's logo review calculates effective stroke weight at small sizes and renders your artwork down to favicon scale so you can see what survives, and the logo system sheet states the computed clear space and minimum size for the file it was built from.
Measure it, do not guess it
See your logo rendered at real sizes, with clear space and minimum size computed from the artwork.
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