Typography on packaging: how to choose a readable font
Why the font on packaging is not aesthetics, but conversion
Scientists studying the link between readability and perception of quality have recorded a direct correlation: r=0,458 at p
Minimum font size: what the law says and what common sense says
TR TS 022/2011 sets strict figures: 2 mm — the minimum height for the shelf life and product name, 0,8 mm — for the rest of the required text. The height is measured by the lowercase letter 'o', not by the capital letter — this is a common mistake in layout, when the designer measures the uppercase letter and gets a deliberately reduced font size relative to the actual requirement.
But a standard is the minimum for legal compliance, not a recommendation for sales. If the packaging is on a supermarket shelf and must be read from a distance of a meter by a buyer rather than examining it in hand, the font size of the name should be increased proportionally: the rule 'letter height = 1/200 of reading distance' provides a guideline. For 60+ audiences, the standard minimum should be increased by 20–30% since age-related decline in contrast sensitivity eats away the difference between letters of similar shape (‘Z’ and ‘3’, ‘b’ and ‘6’).
Serif or Sans-serif: the choice depends not on taste but on the task
On screen, strokes often 'tremble' due to anti-aliasing, but in print it works differently, and font selection should depend on the role of the text on the packaging, not the overall brand style.
| Type of information | Recommended font | Why |
|---|---|---|
| Brand name, large emphasis | Serif or decorative font allowed | Large font size hides small details of strokes, works on image |
| Composition, expiration date, weight | Sans-serif with open apertures | Small typeface requires maximum simplicity of letterform |
| Nutritional value, tables | Grotesque (Sans-serif) narrow typeface | Saves space without losing readability in numbers |
| Text on porous materials | Slab Serif or robust Sans-serif | Thin serifs of Bodoni type 'sink' into paper fibers |
Printing technology dictates line thickness
Here begins what is hardly written about: printing is not a printer A4, but a physical process with tolerances. Flexography, the most common technology for flexible packaging, produces dot gain and plate swell — ink spreads approximately by 1pt, and on plastic this increase can reach 1,15pt. As a result, narrow apertures of letters 'e' and 'a' simply get flooded with ink and turn into a blob.
Practical consequence: minimum stroke width for positive text (dark on light) — 0,5pt, for reverse (light on dark) — 0,75pt, because ink 'eats' the contour of a symbol from inside more aggressively than from outside.
- Flexography — requires allowance for spreading, avoid thin serifs and small numbers in tables.
- Offset — provides cleaner edges, allows for thinner lines and small typefaces without risk of flooding.
- Digital printing — is most predictable, but on poor-quality substrate may produce a 'grainy' effect on small text.
Contrast and lighting: numbers, not 'by eye'
GOST ISO 19809-2021 requires a brightness contrast of over 70% between text and background. Practically, this means a combination of black on white or white on dark — any semi-tonal combinations such as gray on beige sharply lose readability under fluorescent lighting in a retail hall, which 'consumes' part of the contrast compared to a calibrated monitor used by a designer.
Here lies a common mistake: a mock-up is approved by looking at the screen in a dark studio, whereas on a store shelf the packaging is exposed to cold overhead lighting and is juxtaposed with the glossy film of competitors. Contrast should be checked on a printed sample under different lighting conditions — office lighting, daylight by the window, and 'store' spot lighting.
Packaging material: the same font behaves differently
Material is not a background for design, but an active participant in the printing process, which either helps the font or undermines it.
| Material | Problem | Font decision |
|---|---|---|
| Kraft paper (porous) | The paint spreads along the fibers, thin lines 'bloom' | Slab Serif, sturdy Sans-serif, enlarged font size for small text |
| Glossy plastic | Uneven light reflections consume thin strokes | High letter density, increased tracking between symbols |
| Foil and metallized film | Glare, reduces perceived contrast even with black printing | Only bold forms, minimum decorative elements |
| Matte non-porous plastic | Minimal distortions | Thinner typefaces and smaller font size are acceptable |
Special groups: elderly consumers and neurodiversity
Standards such as TR TS are aimed at the 'average' consumer, but the actual audience is broader. For elderly consumers, it's not only letter height that matters, but also aperture — the openness of the internal space of the character: closed, dense forms merge under reduced contrast sensitivity of the eye. For people with dyslexia, uniform stroke width and absence of mirror-like letter pairs in small text close to each other are important. Universal advice: increase inter-letter tracking by 2–4% in small text — it is hardly noticeable visually but significantly eases reading for those who find it harder to decode dense sets.
How to test a font before print run
- Print a test run on the actual material — not on office paper, but on the intended craft, plastic, or foil.
- Check readability of mandatory text (0, 8 mm and 2 mm per TR TS) through a magnifying glass or density scanner — look for fill of apertures in 'e', 'a', 'o'.
- Evaluate the contrast with a device or according to GOST ISO 19809-2021, basing on the threshold 70%.
- Place the sample on a conditional 'shelf' and step back 3 meter — read the product name and weight with a glancing look within 2–3 seconds.
- Repeat the check under three types of lighting: daylight, warm artificial, and cold fluorescent.
- Show the sample to a person older than 60 years without warning them of the test's purpose — an honest reaction is more important than the design department's opinion.
The main mistake that unites most unsuccessful packages is testing the font only on screen and only under ideal lighting. Printing technology, material and real store conditions change the perception of text more than the choice between two similar grotesques. The decision on the typeface should be made after a trial run, not before it.
Why the font on packaging is not aesthetics, but conversion
Scientists studying the link between readability and perception of quality have recorded a direct correlation: r=0,458 at p
Minimum font size: what the law says and what common sense says
TR TS 022/2011 sets strict figures: 2 mm — the minimum height for the shelf life and product name, 0,8 mm — for the rest of the required text. The height is measured by the lowercase letter 'o', not by the capital letter — this is a common mistake in layout, when the designer measures the uppercase letter and gets a deliberately reduced font size relative to the actual requirement.
But a standard is the minimum for legal compliance, not a recommendation for sales. If the packaging is on a supermarket shelf and must be read from a distance of a meter by a buyer rather than examining it in hand, the font size of the name should be increased proportionally: the rule 'letter height = 1/200 of reading distance' provides a guideline. For 60+ audiences, the standard minimum should be increased by 20–30% since age-related decline in contrast sensitivity eats away the difference between letters of similar shape (‘Z’ and ‘3’, ‘b’ and ‘6’).
Serif or Sans-serif: the choice depends not on taste but on the task
On screen, strokes often 'tremble' due to anti-aliasing, but in print it works differently, and font selection should depend on the role of the text on the packaging, not the overall brand style.
| Type of information | Recommended font | Why |
|---|---|---|
| Brand name, large emphasis | Serif or decorative font allowed | Large font size hides small details of strokes, works on image |
| Composition, expiration date, weight | Sans-serif with open apertures | Small typeface requires maximum simplicity of letterform |
| Nutritional value, tables | Grotesque (Sans-serif) narrow typeface | Saves space without losing readability in numbers |
| Text on porous materials | Slab Serif or robust Sans-serif | Thin serifs of Bodoni type 'sink' into paper fibers |
Printing technology dictates line thickness
Here begins what is hardly written about: printing is not a printer A4, but a physical process with tolerances. Flexography, the most common technology for flexible packaging, produces dot gain and plate swell — ink spreads approximately by 1pt, and on plastic this increase can reach 1,15pt. As a result, narrow apertures of letters 'e' and 'a' simply get flooded with ink and turn into a blob.
Practical consequence: minimum stroke width for positive text (dark on light) — 0,5pt, for reverse (light on dark) — 0,75pt, because ink 'eats' the contour of a symbol from inside more aggressively than from outside.
- Flexography — requires allowance for spreading, avoid thin serifs and small numbers in tables.
- Offset — provides cleaner edges, allows for thinner lines and small typefaces without risk of flooding.
- Digital printing — is most predictable, but on poor-quality substrate may produce a 'grainy' effect on small text.
Contrast and lighting: numbers, not 'by eye'
GOST ISO 19809-2021 requires a brightness contrast of over 70% between text and background. Practically, this means a combination of black on white or white on dark — any semi-tonal combinations such as gray on beige sharply lose readability under fluorescent lighting in a retail hall, which 'consumes' part of the contrast compared to a calibrated monitor used by a designer.
Here lies a common mistake: a mock-up is approved by looking at the screen in a dark studio, whereas on a store shelf the packaging is exposed to cold overhead lighting and is juxtaposed with the glossy film of competitors. Contrast should be checked on a printed sample under different lighting conditions — office lighting, daylight by the window, and 'store' spot lighting.
Packaging material: the same font behaves differently
Material is not a background for design, but an active participant in the printing process, which either helps the font or undermines it.
| Material | Problem | Font decision |
|---|---|---|
| Kraft paper (porous) | The paint spreads along the fibers, thin lines 'bloom' | Slab Serif, sturdy Sans-serif, enlarged font size for small text |
| Glossy plastic | Uneven light reflections consume thin strokes | High letter density, increased tracking between symbols |
| Foil and metallized film | Glare, reduces perceived contrast even with black printing | Only bold forms, minimum decorative elements |
| Matte non-porous plastic | Minimal distortions | Thinner typefaces and smaller font size are acceptable |
Special groups: elderly consumers and neurodiversity
Standards such as TR TS are aimed at the 'average' consumer, but the actual audience is broader. For elderly consumers, it's not only letter height that matters, but also aperture — the openness of the internal space of the character: closed, dense forms merge under reduced contrast sensitivity of the eye. For people with dyslexia, uniform stroke width and absence of mirror-like letter pairs in small text close to each other are important. Universal advice: increase inter-letter tracking by 2–4% in small text — it is hardly noticeable visually but significantly eases reading for those who find it harder to decode dense sets.
How to test a font before print run
- Print a test run on the actual material — not on office paper, but on the intended craft, plastic, or foil.
- Check readability of mandatory text (0, 8 mm and 2 mm per TR TS) through a magnifying glass or density scanner — look for fill of apertures in 'e', 'a', 'o'.
- Evaluate the contrast with a device or according to GOST ISO 19809-2021, basing on the threshold 70%.
- Place the sample on a conditional 'shelf' and step back 3 meter — read the product name and weight with a glancing look within 2–3 seconds.
- Repeat the check under three types of lighting: daylight, warm artificial, and cold fluorescent.
- Show the sample to a person older than 60 years without warning them of the test's purpose — an honest reaction is more important than the design department's opinion.
The main mistake that unites most unsuccessful packages is testing the font only on screen and only under ideal lighting. Printing technology, material and real store conditions change the perception of text more than the choice between two similar grotesques. The decision on the typeface should be made after a trial run, not before it.
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