About

Numeric typography carries semantic weight beyond the digits themselves. Tabular figures vs. proportional figures, oldstyle vs. lining numerals - each choice affects readability and perceived professionalism. A mismatched number font in a presentation slide, invoice, or social media graphic can undermine data credibility. This tool renders arbitrary numeric input across a configurable font stack using the Canvas 2D text API, giving pixel-accurate control over fontSize, letterSpacing, lineHeight, weight, and color - then exports the result as a lossless PNG. It handles standard ASCII digits 0 - 9 and common numeric punctuation (decimal points, commas, colons, plus/minus signs). Note: rendering fidelity depends on fonts installed on the client OS; web-safe fonts are guaranteed, others may fall back silently.

Formulas

The Canvas 2D rendering pipeline applies the following composite font descriptor string:

fontDescriptor = fontStyle + fontWeight + fontSize + fontFamily

Canvas dimensions are computed from measured text metrics:

W = measureText(text).width + (letterSpacing × (n − 1)) + 2 × padding

H = lineCount × fontSize × lineHeight + 2 × padding

Where n is the character count per line, padding is the internal canvas margin in pixels, lineCount is the number of newline-separated segments, and lineHeight is the multiplier applied to fontSize for vertical spacing.

Reference Data

Font Family	Classification	Numeral Style	Best Use Case	Web-Safe
Georgia	Serif	Oldstyle / Proportional	Body text, editorial	Yes
Times New Roman	Serif	Lining / Proportional	Documents, print	Yes
Arial	Sans-serif	Lining / Tabular	UI, dashboards	Yes
Verdana	Sans-serif	Lining / Tabular	Screen readability	Yes
Courier New	Monospace	Tabular	Code, fixed-width data	Yes
Trebuchet MS	Sans-serif	Lining / Proportional	Headings, web	Yes
Impact	Sans-serif	Lining / Condensed	Headlines, posters	Yes
Comic Sans MS	Casual	Lining / Proportional	Informal, playful	Yes
Lucida Console	Monospace	Tabular	Terminal, technical	Yes
Palatino Linotype	Serif	Oldstyle / Proportional	Book typography	Partial
Tahoma	Sans-serif	Lining / Tabular	Small sizes, UI	Yes
Garamond	Serif	Oldstyle / Proportional	Classic print	Partial
Segoe UI	Sans-serif	Lining / Proportional	Windows UI	Windows
Helvetica	Sans-serif	Lining / Tabular	Professional design	macOS
Futura	Geometric Sans	Lining / Geometric	Modern branding	macOS
Consolas	Monospace	Tabular	Code editors	Windows
Monaco	Monospace	Tabular	Code editors	macOS
Rockwell	Slab Serif	Lining / Tabular	Display, signage	Partial
Century Gothic	Geometric Sans	Lining / Proportional	Clean design	Partial
Brush Script MT	Script	Proportional	Decorative, invitations	Partial

Frequently Asked Questions

Canvas text rendering relies on fonts installed on the client operating system. If a font like Futura is selected but not installed (e.g., on Windows), the browser silently falls back to the default sans-serif. Stick to web-safe fonts (Arial, Georgia, Courier New, Verdana, Times New Roman) for guaranteed cross-platform fidelity.

Tabular numerals have uniform width - each digit occupies the same horizontal space, which is critical for aligning columns in financial tables. Proportional numerals vary in width (a "1" is narrower than a '0'), producing better visual rhythm in running text. Monospace fonts like Courier New always produce tabular numerals. Sans-serif fonts like Arial typically default to tabular, while serif fonts like Georgia use oldstyle proportional numerals.

Positive letter spacing (tracking) improves legibility at small sizes and in all-caps or all-digit strings by reducing inter-character crowding. However, excessive spacing (beyond approximately 0.15 em) fragments digit groups, making large numbers harder to parse. For phone numbers or codes, 2-4 px of extra spacing at 16-24 px font size is typically optimal.

The PNG is rendered at 1:1 pixel ratio relative to the canvas dimensions displayed. The canvas auto-sizes to fit the text with padding. For higher-resolution output, increase the font size - a 96 px font at standard DPI produces print-quality output at approximately 1 inch character height (96 DPI).

Yes. The input field accepts newline characters. Each line is rendered separately on the canvas with vertical spacing controlled by the line height multiplier. This is useful for formatting stacked data like dates, phone numbers, or financial columns.

Not all font families ship with every weight variant (100-900). If you select "Bold" (700) for a font that only has "Regular" (400), the browser synthesizes a faux-bold by algorithmically thickening strokes - which often looks blurry or uneven. Canvas inherits this browser behavior. For reliable bold rendering, use fonts known to include a true bold variant: Arial, Georgia, Times New Roman, Verdana.