When should I use a sparkline?

Inline trend indicators ● Dashboard KPI cards ● Tables with trend columns

When should I avoid a sparkline?

When exact values matter ● Standalone visualization

What are common mistakes with sparklines?

Adding axes to a sparkline (defeats the purpose) ● Using for unordered data

Time Series

Sparkline

Tiny inline chart with no axes that shows trend in the context of text or tables.

Weekly Trend

Compact inline view

View data (8 rows)

Chart data table: Weekly Trend
Day	Value
Mon	42
Tue	45
Wed	40
Thu	48
Fri	52
Sat	55
Sun	50
Mon2	58

Make a sparkline with your data

Use a sparkline when…

Inline trend indicators
Dashboard KPI cards
Tables with trend columns

Avoid when…

When exact values matter
Standalone visualization

Data it needs

Property	Value
Min Rows	5
Min Columns	2
Column Types	datenumber

Visual anatomy

Marks

line

Channels

position-xposition-y

Axes

Guiding principles

DesignData-Ink Ratio
Maximum data-ink ratio: no axes, no grid

Consider instead

Line Chart

When axis context is needed

Bullet Sparkline

When the inline trend should also carry actual-vs-target context

Common mistakes

Adding axes to a sparkline (defeats the purpose)
Using for unordered data

History

Concept defined by Edward Tufte in Beautiful Evidence (2006) as 'datawords.'

Accessibility notes

Provide a one-line text/sr-only trend summary alongside the visual (e.g., 'rising, latest 58, +38% over 8 days'); without axes the screen-reader has nothing else to grab onto.

Got data? Let's see what works.

Drop your CSV. You'll get a Sparkline plus four alternatives - ranked by which one actually fits your data best.

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