Quick answer
Use selectable math markup or a native equation object for most equations. Use an image only when the destination cannot preserve mathematical structure, and retain an accessible text alternative and editable source.
Math markup
LaTeX source, MathML, and native equation objects preserve structure for editing, scaling, search, reuse, and often accessibility. Support differs by platform, so the rendered output must be tested in the target environment.
Formula images
An image can preserve appearance across limited systems, but it usually loses direct editing, text selection, responsive reflow, and semantic structure. Low-resolution images also become unreadable when zoomed or printed.
Compare the choices
| Requirement | Math markup | Image |
|---|---|---|
| Editable source | Strong | Separate file required |
| Search and copy | Usually available | Usually unavailable |
| Responsive scaling | Strong | Depends on resolution |
| Screen-reader structure | Possible with MathML/native math | Requires a useful text alternative |
Worked example
For x=(-b\pm\sqrt{b^2-4ac})/(2a), keep the LaTeX source and render it with a supported engine. If an image is required for an email system, export a high-resolution or vector image and provide text describing the quadratic formula and its variables.
Common mistakes
Do not use an empty or glyph-by-glyph alt attribute. Do not discard the editable source after exporting. Do not assume an SVG is automatically accessible merely because it scales well.
Verification checklist
Test zoom, print, copy, search, keyboard navigation, screen-reader output, and fallback behavior. Reopen the exported artifact and compare it with the source.
Make the choice from the surrounding expression
For formula image vs math markup, do not decide from glyph shape alone. Read the operands, the mathematical subject, and the sentence around the notation. The same mark can represent different ideas in algebra, probability, set theory, analysis, or typography.
Verification questions
- Does the proposed meaning produce a mathematically valid sentence?
- Are the operands the right type for that meaning?
- Does a nearby definition or legend establish a local convention?
- Would replacing the mark with words preserve the intended statement?
Publishing check
Use the exact Unicode character or structured command, then inspect the final PDF, page, or presentation at normal and enlarged zoom. A font substitution can make distinct characters look similar even when their encoded identities differ.
How this guide was checked
Review method: Intent alignment review, notation/source verification, worked-example check, cross-format rendering review, and duplicate-content comparison for Formula Images vs Math Markup
Verified against: Official standards, primary documentation, and the page-specific sources listed below
What changed: Removed repeated sitewide boilerplate and added content-type-specific decision, verification, and applicability guidance for this exact task.
Page purpose: formula image vs math markup — Compare similar symbols, formats, or mathematical concepts
Automated quality check: Kept noindex until critical findings are resolved.
Verification references
These primary standards and official documentation pages were used to check character identity, syntax, or platform behavior described above.
- Unicode Technical Report #25: Unicode Support for MathematicsUnicode Consortium — Mathematical character usage, variants, and notation support.
- LaTeX Project DocumentationThe LaTeX Project — LaTeX syntax, authoring model, and official documentation links.
- MathML CoreW3C — Semantic web mathematics elements and browser behavior.
- Digital Library of Mathematical FunctionsNational Institute of Standards and Technology — Definitions, notation, identities, and reference material for mathematical functions.