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fitTextOnNLines()

Part of the @remotion/layout-utils package. Available from v4.0.313

Calculates the fontSize needed to fit a text into a given width while respecting a maximum number of lines. Optionally, you can specify a maximum font size, and see how the text is split into lines.

FitTextOnNLines.tsx
tsx
import {fitTextOnNLines} from '@remotion/layout-utils';
 
const text = 'Hello World';
const width = 100;
const maxLines = 2;
const fontFamily = 'Arial';
const fontWeight = 'bold';
 
const {fontSize, lines} = fitTextOnNLines({
  text,
  maxBoxWidth: width,
  maxLines,
  fontFamily: fontFamily,
  fontWeight: fontWeight,
  textTransform: 'uppercase',
  maxFontSize: 80,
});
 
// Example markup:
<div
  style={{
    fontSize,
    width,
    fontFamily,
    fontWeight,
    textTransform: 'uppercase',
  }}
>
  {text}
</div>;

API​

Accepts an object with the following properties:

text​

string

The text to fit.

maxBoxWidth​

number

The maximum width the text should fit into.

info

In the default Remotion stylesheet, borders shrink the container due to box-sizing: border-box.
Subtract any borders, or use outline instead of border.

maxLines​

number

The maximum number of lines the text should be distributed across.

fontFamily​

string

The font-family CSS property you are going to assign to the text.

info

The font needs to be loaded before this API is being called.
If you use @remotion/google-fonts, wait until waitUntilDone() resolves first.

fontWeight​

string | number, optional

Pass this option if you are going to assign a font-weight CSS property to the text.

letterSpacing​

string, optional

Pass this option if you are going to assign a letter-spacing CSS property to the text.

fontVariantNumeric​

string, optional

Pass this option if you are going to assign a font-variant-numeric CSS property to the text.

textTransform​

string

Same as CSS style text-transform.

validateFontIsLoaded?​

boolean

If set to true, will take a second measurement with the fallback font and if it produces the same measurements, it assumes the fallback font was used and will throw an error.

additionalStyles​

object, optional

Additional CSS properties that affect the layout of the text.

maxFontSize​

number, optional

The maximum font size (in pixels) that the text is allowed to reach. If not specified, defaults to 2000.

Return value​

An object with the following properties:

fontSize​

number

The calculated font size in pixels. Assign this to the style prop of your text element.

lines​

string[]

An array of strings, each representing a line of text at the calculated font size. Useful for rendering or debugging how the text is split.

Example​

tsx
import {fitTextOnNLines} from '@remotion/layout-utils';
import React from 'react';
import {AbsoluteFill} from 'remotion';
 
const boxWidth = 600;
const maxLines = 2;
// Must be loaded before calling fitTextOnNLines()
const fontFamily = 'Helvetica';
const fontWeight = 'bold';
 
export const FitTextOnNLines: React.FC<{text: string}> = ({text}) => {
  const {fontSize, lines} = fitTextOnNLines({
    fontFamily,
    text,
    maxBoxWidth: boxWidth,
    maxLines,
    fontWeight,
    maxFontSize: 80,
  });
 
  return (
    <AbsoluteFill
      style={{
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'white',
      }}
    >
      <div
        style={{
          width: boxWidth,
          outline: '1px dashed rgba(0, 0, 0, 0.5)',
          height: 100,
          fontSize,
          fontWeight,
          fontFamily,
          display: 'flex',
          alignItems: 'center',
        }}
      >
        {text}
      </div>
    </AbsoluteFill>
  );
};

Notes:

  • A maximum font size of 80 was specified to prevent the text from becoming too large.
  • The fontFamily and fontWeight were passed to the div element to ensure that the text is rendered with the same font as the one used by fitTextOnNLines().
  • The outline CSS property was used instead of border.
    This is because in Remotion, the border is inside by default and shrinks the container, due to box-sizing: border-box being in the default stylesheet.
  • The lines property in the return value shows how the text is split into lines at the calculated font size. This can be useful for rendering or debugging.
  • The maxFontSize property allows you to limit the font size if you don't want the text to become too large.

Important considerations​

See Best practices to ensure you get correct measurements.

See also​