How do I check that a PDF export preserved equations and special characters?

Use two checks: a targeted search for selected text, and a visual review of representative pages. Text search can help confirm that chosen expected words or symbols are present as searchable PDF text. In Adobe Acrobat, Find and Search can locate text and highlight matching instances [S1]. But a search match does not confirm that an equation’s arrangement or symbols look right, and a search may not cover content that is not searchable text [S1].

Before exporting, choose a few important examples from the original: a long equation, a line with subscripts or superscripts, and a passage containing less common symbols. Note what each should look like. After export, open the corresponding PDF pages and compare those examples with the original at a comfortable reading size. The goal is to check both whether the intended content is present and whether it remains readable.

Make a small search list before you open the PDF. Include ordinary words beside a formula, plus a few symbols or terms that matter in your document. Search for each expected item in the exported PDF and check whether the result lands in the expected section. Acrobat’s search results can jump to and highlight matching instances [S1].

Treat this as a text-presence check, not a formula validator. A hit can coexist with a visually damaged equation, while no hit may simply mean that the content is not represented as searchable text [S1]. If an important expression cannot be found, go directly to its page and inspect it visually rather than concluding from search alone.

For example, your check notes might say: “Page [number]: search for [distinctive term]; inspect the displayed equation containing [key symbol].” Use placeholders if you share the notes.

Choose pages that represent the document’s most demanding content, rather than checking only its opening pages. Include at least one page with a dense or multi-line formula, one with special characters, and one where an equation sits near surrounding prose or a figure. If different sections use different notation, include an example from each relevant section.

Compare each selected PDF page with the corresponding original. Look for symbols that appear missing or changed, subscripts and superscripts that seem misplaced, operators or lines that look out of place, and expressions that are hard to read at normal viewing size. These are visual review prompts, not a guarantee that every equation has been checked. If you find a discrepancy, record the page and the expression so you can revisit the source document or export process.

Use this checklist for each export:

1. Select representative pages from the original: dense formulas, special characters, and varied notation.
2. Write down a few expected search terms or symbols and where they should appear.
3. Search the PDF for selected expected text when it should be searchable. In Acrobat, use Find or Search and inspect the highlighted result [S1].
4. Visually compare the selected PDF pages with the original, including equation layout and readability.
5. Record discrepancies by page and section. After correcting them and exporting again, repeat the checks on the affected pages.

Keep the search and visual checks separate. Search can help check selected searchable text, but it is not a dedicated test of export fidelity or proof that every symbol and equation survived correctly [S1].