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Get two comparable archived versions
Start with two captures that represent the same webpage at different times. Record the original page URL, the archive reference for each capture, and each capture’s timestamp. Confirm which capture is earlier; the date a PDF was downloaded is not necessarily the date the page was captured.
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Archive services do not necessarily provide a PDF for every saved page. Verify that you can obtain a PDF for each version you want to compare, and check that each file contains the relevant page. If the captures use different URLs, determine whether the difference is only a redirect or URL variation, or whether they are actually different pages. The PDF comparison step cannot establish that two inputs are equivalent webpages.
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Compare the PDFs in Acrobat Pro
Adobe Acrobat Pro’s Compare Files feature analyzes two PDF versions and displays the results in a comparison document. Adobe’s help page describes side-by-side and single-page review, a results summary, comparison settings, and saving the results: Compare two versions of a PDF file (Acrobat Pro) (updated September 26, 2024).
- Open Acrobat Pro and choose the Compare Files tool.
- Select the earlier capture as the old file and the later capture as the new file. Check the dates before proceeding; reversing the inputs can make the report harder to interpret.
- Choose settings appropriate to the PDFs, including any page range, document type, or text-only comparison options that apply.
- Run the comparison. Acrobat creates a results document with a summary and navigable reported changes.
- Review changes in side-by-side or single-page view, using available filters for annotations, formatting, or background differences as needed.
- Save the comparison results document alongside the untouched source PDFs and their capture metadata.
Choose settings for text, layout, and scans
Text-focused changes
If you mainly need to identify changed wording in PDFs with selectable text, consider a text-only comparison to reduce distracting graphic differences. Set the relevant page range when only part of the document is in scope. A text-focused report is not a substitute for checking visual changes that may affect meaning.
Layout and graphic changes
If appearance matters—for example, the placement of a notice, an image, or a form element—retain graphic comparison and inspect the page layout. Formatting and background changes can be reported in addition to text or graphic changes. Filter noise where useful, but do not discard a category until you know it is irrelevant to your question.
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Scanned PDFs
A scanned PDF may consist of page images rather than selectable text. Adobe documents comparing scanned pages by capturing each page as an image and comparing pixels. For scans, drawings, or illustrations, use an image-based comparison approach and inspect the rendered pages; text-only comparison may not show the differences you need.
Different pagination or document structure
When the files have different page counts, reflowed content, or substantially different layouts, review the page-range and document-type settings before interpreting results. A shift in pagination can make a detected difference look more significant or less significant than it is. Confirm changes against the surrounding page context rather than relying only on a summary count.
Interpret the report and preserve an audit trail
A reported difference is a lead for review, not proof that the webpage’s meaning changed. A layout shift, formatting adjustment, annotation, or background change may be incidental; conversely, a small text change can matter. Read the surrounding content and compare the corresponding page context, especially if text has reflowed or a source is scanned.
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- Check that the report compares the intended old and new capture dates.
- Verify important reported text changes against the original PDFs.
- Inspect visual changes in context, including nearby headings, images, and page elements.
- Keep the result document, both original PDFs, and the capture URLs and timestamps together so another reviewer can trace the comparison inputs.
Troubleshoot common comparison problems
The comparison shows few or no changes
Confirm that the two PDFs actually represent different capture dates and the same page. Check that the relevant pages are within the selected page range. If a PDF is scanned, switch to an image-based comparison rather than assuming that a text-focused setting can detect its contents.
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Determine whether the task is textual or visual. For a text-only question, try the text-only setting and review the wording directly. For a question about page appearance, keep graphic comparison and filter only categories that do not matter to the review.
Pages do not line up
Different pagination or layout can complicate page-by-page review. Recheck the document-type and page-range settings, then compare the content in context rather than treating page number alone as proof that two passages correspond.
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You cannot find a PDF for one archived capture
Check the archive’s available options for that capture and verify whether the archived page can be saved or printed as a PDF. Do not assume every archived capture has a ready-made PDF. If you create a PDF from a rendered archived page, retain the capture reference and date and note how the file was produced.
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ScreenshotNeo is a website screenshot API and MCP server, useful for capturing a page without setting up a browser automation workflow. It does not compare two PDFs or retrieve a historical archive capture: use the PDF workflow above for that. A ScreenshotNeo call can instead make a fresh screenshot of a page, which may help document its current appearance. See the ScreenshotNeo website and API documentation.
For example, this cURL request captures the live Stripe homepage as a WebP image:
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpReplace the example URL with the page you want to capture and provide your API key. The service also accepts the parameter names used by other screenshot APIs, which can make switching easier.
- Cookie and consent banners are accepted before capture, and 60+ known consent platforms, newsletter popups, and chat widgets can be removed; each step can be turned off.
- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing; response headers indicate the page verdict and whether it was billed.
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Frequently Asked Questions
Can I compare archived webpages if I only have screenshots, not PDFs?
This workflow and Acrobat’s cited guidance concern PDF inputs. For screenshots, use an image comparison method; it will not produce the same kind of PDF comparison report.
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