BASALT · JOURNAL
How to compare an original and redacted PDF
Comparing a source PDF with a redacted release helps catch missing pages, shifted marks, and accidental changes. The comparison must be controlled: the original should not be uploaded to an untrusted service or left open in a shared environment.
Compare structure before words
Check page count, order, dimensions, orientation, bookmarks, and exhibit labels. If a page was intentionally removed, confirm the required placeholder or notation is present. Structural differences often reveal an export mistake before a detailed content review.
Compare sensitive regions safely
Use a private local workflow to review where marks occur without copying the removed values into a new report. Confirm that the remaining text, tables, and images still match the source except for approved changes. Search the release for identifiers that should be gone.
Record the decision
For important productions, note the source version, release version, reviewer, date, and verification checks. Keep the comparison record separate from the shareable PDF so it does not disclose the protected data.
Frequently asked questions
Should I upload both PDFs to an online comparison tool?
Not when the files are confidential. Use a local tool or an approved environment.
What differences matter most?
Missing pages, changed numbers, shifted redactions, retained hidden content, and broken labels are high-priority findings.
Can visual comparison replace text search?
No. Use both visual and structural checks because each catches different failures.
Doing it in Basalt
Basalt keeps PDF review on-device and helps verify that a redacted release differs only where intended. Download Basalt.
Redaction that proves itself
Basalt destroys the content you mark, then re-opens the file it wrote and proves the content is gone before it saves anything. Your documents never leave your Mac.