A translated sentence can be grammatical and completely wrong. If OCR read “not permitted” as “now permitted,” translation may confidently carry the wrong instruction into another language. The translator never saw the word you saw on the scanned page.
When a result looks suspicious, compare three things: the page image, the recognized source text, and the translation. This separates recognition mistakes from translation decisions and keeps you from paying to repeat the wrong stage.
Follow the error through the workflow
OCR recovers characters and document structure from page images. Translation then works with that recovered material. A mistake can enter at either stage, and layout errors matter as much as misspelled words.
Imagine a two-column page. Every word is recognized correctly, but sentences from the right column are inserted into the left column's paragraph. A translator receives an argument that no longer makes sense. Polishing the English will not restore the lost order.
Use a short diagnosis before making changes:
| What you find | Likely place to investigate |
|---|---|
| A name differs from the visible scan | Character recognition |
| Correct words appear in the wrong sequence | Layout and reading order |
| Source text is correct but the meaning changes | Translation |
| A correct translation loses a note marker on export | Output structure or rendering |
A single passage can contain both text and layout issues. When proofreading, look beyond correcting uncommon words or technical terms; compare paragraph breaks and ordering against the original book to ensure the logical flow of the argument is not disrupted.
Give names, numbers, and symbols their own pass
Ordinary prose sometimes survives a missing letter. A measurement, identifier, or personal name may not. Look closely at 0/O, 1/l/I, minus signs, decimal separators, superscripts, and accented letters. Search both the expected spelling and plausible misreadings of a recurring name.
When checking tables, review row headers, column headers, units of measurement, and explanatory notes together to make sure numbers sit under the right headings. For formulas, even if the surrounding text reads smoothly, check subscripts, exponents, parentheses, and operators like plus or minus signs individually to ensure mathematical relationships carry over accurately.
Keep a small issue sheet with page number, source fragment, observed error, and correction. For example: “PDF page 38, table 2: minus sign missing before 0.4.” This is more useful than a general note that the chapter needs work.
Sample the difficult pages, not just the opening
Review at least one ordinary page and each layout type that appears in the document: columns, dense notes, a table, a diagram with labels, and a page with faint or damaged print. Include a page transition where a sentence continues onto the next image.
Read a complete paragraph across each transition. Verify that a running header has not become part of a sentence and that a footnote has not interrupted the main text. Then compare the translation of that same passage. If it introduces an actor, conclusion, or qualification absent from the source, investigate further.
Sampling is triage, not a guarantee for the rest of the book. If the same error repeats, expand the check to all pages with that feature. A repeated heading in the body is a reason to search the whole output, not merely delete the first example.
Decide whether to redo OCR or correct extracted text
If many pages are blurred, skewed, cut off, or in the wrong order, start with a better source where possible. Redoing recognition on the same unreadable image may reproduce the same problem. Preserve the old result and give the new run a distinct filename so you can compare them.
If recognition is mostly sound and errors are isolated, an editable Markdown copy may be easier to correct in your own editor. Keep corrections tied to source pages. This is a manual workflow; do not assume PDF Craft supplies an OCR correction screen or automatically reuses your edits in an existing task.
PDF Craft's PDF conversion workspace can produce EPUB for reading or Markdown for editing. Conversion does not require translation; enable translation only when you want it. If you need to inspect recognition independently, first obtain an untranslated output. A later translation or rerun is a separate processing decision; consult Pricing before repeating long tasks.
After correcting the source, compare the new translation with the earlier one at the known error locations. Then check the surrounding sentences: a corrected name or negation may affect pronouns, agreement, or an entire explanation. Save your issue sheet with the source and finished result so the next review starts with evidence rather than memory.