Overlapping text in jsPDF 2.0.0 is not caused by one universal setting. First confirm that the TTF is loaded into jsPDF’s virtual file system, registered with the exact family and style names you select, and rendered through the path you think you are using. Then determine whether the collision is vertical (line baselines are too close) or horizontal (glyphs or words overlap, or the next text starts at the wrong x-coordinate). Those symptoms point to different checks.
For documents produced with html() or the context2d API, also check the 2.0.0 release context: the project’s release notes list a fix for custom-font use on that route. That note does not prove that every font or rendering path is fixed. The reliable approach is a minimal reproduction, explicit font selection, one layout change at a time, and verification of glyph coverage.
Start with a minimal reproduction
Remove tables, images, automatic page breaks and unrelated CSS. Keep the same TTF file, a short string that shows the problem, and one rendering route. A minimal file tells you whether the failure is in font registration, text measurement, line placement or the HTML/context2d integration.
Use a string containing both ordinary Latin characters and any characters that fail in the real document. If the short sample is clean, add your layout pieces back one at a time. This is diagnostic isolation, not a claim that a particular sample has been tested here.
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Register and select the TTF explicitly
The jsPDF project documents a TTF workflow that adds the font data to its virtual file system, registers the family and style with addFont, and selects it with setFont. The names passed to registration and selection must match. Start from the project’s README workflow: jsPDF custom-font instructions.
Direct text() example
import { jsPDF } from 'jspdf';
import fontFile from './fonts/Example-Regular.ttf?arraybuffer';
const pdf = new jsPDF({ unit: 'pt', format: 'letter' });
// Convert the imported ArrayBuffer to the binary string expected by jsPDF.
const bytes = new Uint8Array(fontFile);
let binary = '';
for (const byte of bytes) binary += String.fromCharCode(byte);
pdf.addFileToVFS('Example-Regular.ttf', binary);
pdf.addFont('Example-Regular.ttf', 'Example', 'normal');
pdf.setFont('Example', 'normal');
pdf.setFontSize(12);
pdf.text('A short string with troublesome characters: café — 123', 72, 72);
pdf.save('font-check.pdf');Your bundler may expose the TTF as a base64 string, URL or ArrayBuffer rather than the import form above. The important sequence is unchanged: add the file, call addFont with the same internal filename, register the family/style, then call setFont before writing text. If you register Example but select Example-Regular, jsPDF may fall back to another face and produce different metrics.
Check the active font before writing
Put setFont('Example', 'normal') immediately before the first affected call, especially when code switches between bold, italic and regular text. Do not rely on a previous page or helper function having left the desired font selected.
Identify the rendering path
jsPDF can write text directly with text(), or generate a document through html() and context2d. Test the same string through the route used by your application.
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Direct text output
With text(), you control x/y coordinates and any line spacing you calculate. A collision between lines is usually a coordinate or line-height problem; a collision inside one line requires checking font selection, width calculations and manually advanced x positions.
html() or context2d
The jsPDF 2.0.0 release notes, dated 2020-08-11, say: “Fixed usage of custom fonts in context2d/when using the html method.” See the 2.0.0 release summary for the exact release context. Treat this as a route-specific lead, not a guarantee for every browser, stylesheet or TTF. Generate a tiny HTML document with the same font and compare it with a direct text() call. If direct text works but HTML output does not, concentrate on the 2.0.0 HTML/context2d integration, computed CSS and the font asset actually reaching the browser.
Classify the collision before changing values
| What you see | Likely dimension to inspect | First checks |
|---|---|---|
| Lines from successive rows touch or share pixels | Vertical placement | Baseline y-coordinates, line-height, font size and page scaling |
| Letters within one word overlap | Glyph metrics or font substitution | Active family/style, TTF loading, glyph coverage and width measurement |
| Words overlap or the next word starts too far left | Horizontal advance | Measured width, manual x increments, selected face and fallback behavior |
| Text is replaced by boxes, odd symbols or missing characters | Glyph coverage | Whether the TTF contains every required character and whether the intended font was selected |
This distinction matters because increasing line-height cannot repair a wrong horizontal advance, and changing font size cannot add missing glyphs. The available issue report describes one overlapping-words case and recommends explicit font selection plus font-size and line-height adjustments; it is evidence for those checks in that report, not a universal diagnosis. Read issue #3655, “jsPDF: custom font styling problem” for that reported scenario.
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Fix vertical baseline collisions
Use a predictable baseline increment
When writing lines yourself, calculate the next baseline from a single line-height value rather than repeatedly estimating positions.
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const fontSize = 12;
const lineHeight = 16; // points; choose deliberately for this document
let y = 72;
pdf.setFont('Example', 'normal');
pdf.setFontSize(fontSize);
for (const line of ['First line', 'Second line', 'Third line']) {
pdf.text(line, 72, y);
y += lineHeight;
}Increase the increment only until descenders from one line no longer touch the next. If the collision disappears when you use a built-in font but returns with the TTF, verify that the custom face is really active and that your line-height calculation is not based on a different font’s metrics.
Check CSS when using HTML
For html(), inspect the browser’s computed font-family, font-size and line-height. A webfont that has not finished loading when capture begins can make the browser lay out with a fallback face, then produce unexpected dimensions. Ensure the font is available before invoking the conversion and test with a single paragraph before restoring complex CSS.
Fix horizontal overlap and incorrect word positions
Measure with the selected face
If you place words manually, measure each word after selecting the custom font and add the intended gap. Do not measure with a built-in font and draw with the TTF.
pdf.setFont('Example', 'normal');
pdf.setFontSize(12);
const gap = 4;
let x = 72;
for (const word of ['Custom', 'font', 'layout']) {
pdf.text(word, x, 72);
x += pdf.getTextWidth(word) + gap;
}Current jsPDF API documentation covers font selection, text methods, line-height controls and width-related APIs. Use it as current documentation, not as proof that every API behaved identically in the 2.0.0 release: jsPDF API documentation.
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Bold and italic requests can silently use a different registered face or a fallback if only the regular TTF was added. Register each style you use, or deliberately request the style that exists. Compare a one-line regular sample with the affected style; a change in glyph widths points to registration or font metrics rather than line spacing.
Verify glyph coverage
Custom TTF files must contain the characters your document needs, particularly for non-Latin text. Missing coverage generally appears as missing glyphs, replacement symbols or corrupted characters, although it can be mistaken for a layout problem. Test representative Unicode characters in isolation and confirm that the actual TTF file—not a similarly named webfont variant—is being embedded. The project’s README discusses this requirement in its custom-font guidance: README.
If only certain scripts fail, obtain a TTF with the required coverage or use a separate registered face for those characters. Do not try to solve missing glyphs by endlessly changing font size.
Apply changes one at a time
- Confirm registration: verify the VFS filename, family and style strings.
- Select explicitly: call
setFontandsetFontSizeimmediately before the test. - Keep one route: test direct
text()separately fromhtml()/context2d. - Classify the symptom: vertical baseline, horizontal advance or missing glyph.
- Change one variable: adjust line-height for vertical collisions, or font/measurement/positioning for horizontal ones.
- Regenerate and inspect: compare the same string and coordinates after each change.
This order prevents a larger line-height from masking a font fallback, or a smaller font from hiding an incorrect width calculation.
Troubleshooting common failures
The custom font appears to be ignored
Cause: the TTF was not added to the VFS, the internal filename differs, or the selected family/style does not match registration.
Fix: log the exact strings used by addFileToVFS, addFont and setFont; reduce to one font and one line; then export a PDF before adding other styles.
Only HTML output overlaps
Cause: the HTML/context2d route, computed CSS or font-loading timing differs from direct text output.
Fix: reproduce with a minimal HTML element, wait until the font is available, inspect computed styles, and check the 2.0.0 release-note fix without assuming it covers your exact integration.
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Changing line-height does nothing
Cause: the collision is within a line or is caused by wrong horizontal measurements.
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Fix: test one word at a time, measure with the selected TTF, and inspect x-coordinate arithmetic.
Characters are missing or replaced
Cause: the TTF lacks the glyphs or a fallback face is being used.
Fix: test the failing Unicode range, use a font with coverage for those characters, and register/select that face explicitly.
Different pages have different spacing
Cause: helper code changes font, size, scale or coordinates between pages.
Fix: set the font and size at each page or section boundary and centralize the baseline calculation. Keep units consistent; mixing pixels, points and scaled canvas coordinates can create apparent font errors.
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Embedding a TTF increases the document’s resources and can make generation slower than a built-in font, especially when you create many documents in one browser session. Reuse the loaded font data, avoid repeatedly converting the same file, and keep a minimal font subset when licensing and language coverage allow. These are engineering considerations, not measurements of a particular jsPDF build.
jsPDF 2.0.0 was released on 2020-08-11. Current API documentation may describe later behavior or names, so record the exact jsPDF version in a reproducible bug report. If a newer supported release is available to your project, test it separately; the 2.0.0 release note alone does not establish that upgrading fixes every overlap.
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Should I fix the overlap by lowering the font size first?
No. First determine whether the collision is vertical, horizontal or caused by missing glyphs. Font-size changes can hide a symptom while leaving registration or measurement errors unresolved.
Does the jsPDF 2.0.0 HTML fix apply to direct text()?
The release note specifically mentions custom fonts in context2d and the html method. It does not establish a fix for every direct text() case or every custom font.
Why does a built-in font work when my TTF does not?
A built-in font bypasses your TTF loading, registration, glyph coverage and metric calculations. Compare explicit family/style selection and measured widths before changing the document layout.
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