What is the WCAG recommendation for line length?

WCAG Success Criterion 1.4.8 (Level AAA) specifies that width should be no more than 80 characters or glyphs per line for text. This ceiling prevents extremely long lines that force readers to scan far horizontally, which increases eye strain and the risk of losing their place.

What is the ideal characters per line for body text?

Typography research and major style guides converge on 45-75 characters per line (CPL) as optimal for body text. This range keeps eye movement comfortable, reduces line-tracking errors, and improves reading speed. Narrower columns (35-50 CPL) may suit sidebars; wider columns (75-100 CPL) are sometimes acceptable for large-display contexts.

Do spaces count as characters?

Yes. This tool counts all characters including spaces, which matches the WCAG 1.4.8 definition of "characters or glyphs." Counting spaces gives a more realistic measure of horizontal eye travel compared to counting only non-whitespace characters.

Why does line length matter for accessibility?

Long lines make it harder to move from the end of one line to the beginning of the next, especially for users with dyslexia, low vision, or cognitive disabilities. Short lines can disrupt rhythm and make text feel choppy. The 45-75 CPL range minimizes both problems and is particularly important when users cannot reflow or resize content.

How accurate is the CSS estimator?

The CSS estimator provides an approximation based on typical character widths for common font families. Actual CPL varies by the specific typeface, font weight, and individual glyph widths. Use it as a planning guide and verify with real text once the layout is implemented.

Does this tool check the rendered line length on a web page?

This tool analyzes pasted text as typed (using explicit line breaks) or estimates CPL from CSS parameters. It does not fetch or render a live web page. For rendered-page analysis, paste the visible text from your page into the input area.

Line Length Readability

Paste text or enter a CSS column width to instantly check whether your line lengths fall within the optimal 45-75 characters per line range and meet WCAG guidelines.

Paste body text to analyze

Tip: use real column-wrapped text for accurate results.

Paste text or use the CSS Estimator, then click Analyze.

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Avg CPL

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Median CPL

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Min CPL

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Max CPL

Compliance Check

Per-Line Breakdown

#	CPL	Status	Line preview

Line Length Reference

Too short (< 45 CPL)
Choppy rhythm; uncomfortable for sustained reading.

Optimal (45-75 CPL)
Recommended by typographers and readability researchers.

Acceptable (76-80 CPL)
Within WCAG 1.4.8 AAA ceiling but above ideal.

Too long (> 80 CPL)
Fails WCAG 1.4.8 AAA; high risk of eye-tracking errors.

Summary

The Line Length Readability checker measures how many characters fit on each line of your text and compares the result against established readability guidelines. WCAG 1.4.8 (Level AAA) recommends no more than 80 characters per line, while typographers widely cite 45-75 characters as the ideal range for comfortable reading. Paste a sample paragraph to audit real content, or enter a container width and font size to estimate CPL for a CSS layout.

How it works

Paste body text into the input area — each line break counts as a separate line.
The tool counts raw characters per line (including spaces) for every line.
Average, minimum, maximum, and median CPL are computed and displayed.
Each metric is benchmarked against the ideal range (45-75 CPL) and the WCAG 1.4.8 AAA ceiling (80 CPL).
A per-line breakdown table highlights lines that are too short, optimal, or too long.
Switch to the CSS estimator tab to calculate expected CPL from container width, font size, and font family.

Use cases

Audit body copy before publishing to confirm it meets WCAG 1.4.8 AAA line length requirements.
Evaluate existing web page text for typography readability issues.
Check article or blog post column widths against the 45-75 CPL guideline.
Validate e-learning course text line lengths for improved comprehension.
Estimate CPL for a CSS layout using container width and font size inputs.
Review newsletter or email templates for optimal line length.
Support UX writers and content designers with objective line-length data.
Identify unusually short or long lines that break reading rhythm.

Frequently Asked Questions

Last updated: 2026-05-29 · Reviewed by Nham Vu