For a defensible record, save more than an image. Capture a full-page screenshot and a PDF, but also preserve the exact URL, page source or downloaded HTML, collection times, collector and access details, the capture-tool version, and a cryptographic hash for every file. Keep the originals unchanged on clean, controlled storage and maintain a chain-of-custody log. A screenshot shows what was visible at one moment; it does not by itself prove authorship, accuracy, or that the file was not altered.
The workflow below follows the evidence-preservation principles in the Berkeley Protocol for Digital Open Source Investigations (Human Rights Center, UC Berkeley and UN OHCHR, 2020) and ICC/Eurojust practical guidance. It is suitable for journalists, researchers, civil-society investigators and legal teams. Local evidence, privacy and computer-access laws still control what you may collect, publish or submit.
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What a screenshot and PDF can—and cannot—establish
A full-page screenshot preserves the rendered appearance of a page, including the headline, surrounding text, images and layout that were visible when you collected it. A PDF gives reviewers a convenient, searchable rendering for sharing and annotation. Neither format alone establishes who authored the material, whether the claims are true, when the underlying events occurred, or whether the file was changed after capture.
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A hash is an integrity check. If the SHA-256 value of a file later matches the value in your log, you have evidence that the file is the same byte-for-byte object you hashed. A matching hash does not prove that the page was truthful or that the capture was made by the person claimed; provenance, authentication and corroboration remain separate questions.
Prepare the collection before opening the page
Synchronize the clock
Synchronize the collection computer with a reliable Network Time Protocol source. Note the time zone and the synchronization status in the log. The time printed by a website can be wrong or editable, so your own system time and the method used to establish it must be documented.
Create a case folder and readme
Use a unique case identifier and a folder that separates originals from working copies. For example:
CASE-2026-0415-war-crimes-page/
00-readme-and-log/
01-original-screenshots/
02-original-pdfs/
03-html-and-assets/
04-metadata/
05-hashes/
06-working-copies/In the readme, state the case identifier, collector, organization, device and operating-system version, browser and version, time zone, network used, and the purpose of the collection. Do not edit files in the original folders after hashing; perform redaction, cropping or annotation only on clearly labelled working copies.
Check access and safety constraints
- Confirm that collecting the page is lawful in your jurisdiction and consistent with the site’s access controls and applicable terms.
- Record whether the page requires a login, geolocation, a subscription or another special access path. Never bypass a technical restriction merely to obtain a cleaner capture.
- Plan for personal-data exposure. Pages about alleged war crimes can reveal victims, witnesses, locations or contact details. Limit who can access the case folder and encrypt storage when appropriate.
- Use a dedicated, clean drive or SSD for the originals and maintain at least one controlled backup. Malware, tracking scripts and hostile content are possible on any untrusted page.
Record the page’s context before saving it
Open the exact URL in a fresh browser profile or another controlled environment. Before scrolling or interacting, write the following in the log:
- Exact URL, including query string and fragment when present.
- Page title, publisher or account name, and any visible publication or update date.
- The reason the page may matter and the specific passage, image or claim you need to preserve.
- Your system date, time, time zone and the collection start time.
- Whether you were logged in, used a proxy or VPN, or encountered a regional or age gate.
- Any visible warning that the page is edited, removed, user-generated or automatically translated.
Save the page’s displayed text and context before clicking links that could change the state. If the content loads in stages, note when the main text, images and embeds finished loading.
Capture a complete, full-page screenshot
Chromium-based browsers
- Open the page in a clean profile and wait for the main content and images to finish loading. Scroll through once if the site lazy-loads media.
- Open Developer Tools with
Ctrl+Shift+I(Windows/Linux) orCmd+Option+I(macOS). - Open the command menu with
Ctrl+Shift+PorCmd+Shift+P, type Capture full size screenshot, and select it. - Retain the original image exactly as downloaded. Record the filename, pixel dimensions, browser version and the time the command completed.
If a page uses an infinite scroll, capture the loaded extent and record that it was not finite. Sticky headers, cookie dialogs or chat widgets can cover text; do not silently remove them in an evidence original. You may create a separate, clearly labelled readability copy after preserving the unobstructed original.
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Firefox
- Right-click the page and choose Take Screenshot (or use the browser’s screenshot command).
- Choose Save full page, check the preview for missing sections, and save the original PNG.
- Record the browser version, viewport size and any portions that could not be rendered, such as cross-origin frames or blocked media.
When a browser capture is incomplete
Some pages are assembled by JavaScript, require interaction, or stop loading when automation is detected. Capture the visible state, then record the failure or limitation rather than repeatedly refreshing until the page changes. A second capture after a documented interaction can be useful, but each state should have its own timestamp and hash.
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Export a PDF for review and disclosure
- In Chromium, press
Ctrl+PorCmd+P. In Firefox, open the print dialog from the menu. - Set the destination to Save as PDF. Use the page’s default paper size unless a different size is necessary to keep tables or images legible.
- Enable Headers and footers when they show the URL, page title or print date. If they introduce misleading information, leave them off and document that choice.
- Check the preview for clipped columns, missing background images, blank pages and page breaks through quoted text.
- Save the PDF to the original-PDF folder and record the dialog settings, page range, browser and completion time.
Keep the PDF as a rendered view, not as a replacement for native web material. Print engines can omit scripts, comments, embedded media, HTTP response headers and other information that may matter later.
Preserve HTML, assets and collection metadata
Use the browser’s Save Page function or an approved acquisition tool to retain the HTML source and associated files when feasible. Keep the directory structure together; do not open and resave the HTML in an editor that rewrites it. If the page depends on API responses, downloadable documents, captions or embedded images, preserve those related files where lawful and practical.
Create a metadata manifest in plain text or CSV. One row per item should include:
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- Original filename and file type.
- Exact URL and access path (including login or geolocation conditions).
- Collector, device, operating system, browser and capture-tool version.
- Collection start and end timestamps with time zone.
- Visible page title, publisher/account and publication or update date.
- Notes on dynamic content, blocked resources, consent dialogs, bot checks or other anomalies.
- Hash algorithm and resulting digest, added after the file is finalized.
Where appropriate, record the collector’s IP address or network details in a restricted-access field. Avoid distributing network data publicly when it could endanger a person.
Hash every original and maintain chain of custody
Calculate SHA-256 hashes
On macOS or Linux, run:
shasum -a 256 01-original-screenshots/page-full.png
shasum -a 256 02-original-pdfs/page.pdf
shasum -a 256 03-html-and-assets/page.htmlOn Windows PowerShell, run:
Get-FileHash . 1-original-screenshotspage-full.png -Algorithm SHA256
Get-FileHash . 2-original-pdfspage.pdf -Algorithm SHA256
Get-FileHash . 3-html-and-assetspage.html -Algorithm SHA256Copy each digest into the manifest, along with the command or tool used and the time of hashing. Hash the metadata manifest itself after it is complete. Never “repair” a hashed original; if a transfer or conversion is needed, create a new item, document the operation and hash the new file.
Log every handoff
A chain-of-custody entry should show who collected, copied, accessed, exported or transferred an item, when, why, from which storage location and to which destination. Verify the hash after each transfer. Keep the original media write-protected or access-controlled where possible, and restrict administrative access to the case folder.
Store, back up and review safely
Use a new or clean external drive or SSD for the primary evidence set and keep at least one controlled backup in a separate location. Encrypt both when the material or people identified in it face risk. Do not upload unredacted files to consumer cloud services or public repositories without a documented risk assessment.
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Before analysis, verify hashes against the manifest and work from copies. Compare the capture with independent reporting, archived versions, geolocation or other appropriate evidence. Look for inconsistencies in dates, usernames, language, image reuse and edits. Preserve contradictory material rather than deleting it; an investigator’s credibility depends on showing how conclusions were reached.
Choose a capture method by the evidentiary need
| Method | What it preserves well | What it misses | Best use |
|---|---|---|---|
| Viewport screenshot | What was visible in one screen view | Content below the fold, source and network context | Quick reference or a detail that must be shown at native size |
| Full-page screenshot | Rendered layout and surrounding context in one image | HTML structure, response headers, hidden or interactive states | Visual record of an article, profile or page as seen |
| Browser PDF | Shareable, searchable rendered pages | Scripts, comments, headers and some embedded media | Review, printing and disclosure alongside originals |
| Saved HTML and related files | Native page structure and downloaded resources | Server-side state that was never sent to the browser | Deeper preservation and later technical examination |
| Evidence package | Screenshot, PDF, HTML, metadata, hashes and custody log | It still cannot prove the truth of an allegation by itself | Investigations and potential legal proceedings |
Assess each option on visual completeness, preservation depth, provenance, integrity, repeatability and privacy impact. The most defensible package normally combines the rendered captures with native material and a clear log.
Common failures and how to fix them
The screenshot is only the visible viewport
Use the browser’s full-page command, not the ordinary screenshot shortcut. If the page is infinite-scroll, capture the loaded extent and note the limitation; do not describe it as a complete page.
Images or text are missing
Wait for lazy-loaded resources, scroll through the page once, and recapture. Record blocked URLs, broken embeds or consent gates. Preserve the failed attempt if it documents what a visitor could actually see.
A cookie banner, newsletter popup or chat window obscures content
Capture the initial state before dismissing anything. If you accept or close a dialog, log the action and make a second capture. Keep both states when the dialog affects interpretation.
The PDF has clipped columns or blank pages
Inspect the print preview, change orientation or paper size, adjust scale, and select the required page range. Keep the first failed PDF only if it is relevant to the collection history; otherwise document the failed export and hash the corrected original.
The page changes between captures
Record each URL, timestamp and visible state separately. Save screenshots of edits or deletions instead of overwriting earlier files. A later version does not replace the earlier capture.
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A bot check or CAPTCHA blocks access
Do not attempt to defeat it. Record the block, the time, the URL and the access conditions. Seek an authorized copy or corroborating source through lawful means.
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Stop analysis, isolate both files and recalculate the digest from the original medium. Check for an incomplete transfer, automatic file conversion or an accidental edit. Record the discrepancy and every corrective step; never silently replace the manifest value.
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ScreenshotNeo is a website screenshot API and MCP server for developers. It can return a PNG, JPEG, WebP or PDF from one GET request, including full-page captures with lazy images loaded. Before capture, it accepts cookie or consent banners as a visitor and removes more than 60 known consent platforms, newsletter popups and chat widgets; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and the response identifies the result with X-Page-Verdict and X-Billed headers.
For an API capture, replace the example URL with the page you are authorized to collect:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for output formats, PDF parameters, full-page options, hashes you calculate locally and the other capture controls. The same request in Python is:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)And in Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo also supports element-by-CSS capture, dark mode, 12 device presets or custom viewports, retina scale, PDF paper size and margins, custom CSS and JavaScript, clicks before capture, hidden selectors, waits for selectors, delays or network idle, request and resource blocking, custom headers, cookies, user agents and Authorization, time zone and geolocation, transparent backgrounds, resizing, configurable-TTL caching, signed links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API and an OpenAPI specification. Its MCP server provides take_screenshot, get_page_info and capture_pdf tools for Claude, Cursor and other MCP clients.
Every feature is included on every plan: 1,000 shots per month are free with no card; paid plans are $5 for 3,000, $15 for 15,000, $39 for 60,000, $99 for 250,000 and $249 for 1,000,000. Yearly billing gives two months free. Keep the returned files, response headers, URL, timestamps and your locally calculated hashes in the same evidence package as a browser capture.
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FAQ
Should I publish an unredacted screenshot?
Not automatically. Review faces, names, addresses, medical details, precise locations and metadata for safety and privacy. Keep an access-controlled original and publish only a justified, redacted working copy.
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Does a PDF preserve the website’s original date?
No. A print date or date shown on the page is only one observation. Your collection log must state when and how you obtained the page, and the native HTML and metadata should be retained when the material may be probative.
Can I rely on a web archive instead of collecting the live page?
An archived copy can corroborate a capture, but it is a different acquisition with its own URL, timestamp and provenance. Preserve it as a separate item and document how it was accessed.
What if the page is deleted after capture?
Do not alter the original files. Preserve the hash, custody log and any lawful corroborating copies, and record the deletion as a later event with its own timestamp.
Frequently Asked Questions
Should I publish an unredacted screenshot?
Not automatically. Review faces, names, addresses, medical details, precise locations and metadata for safety and privacy. Keep an access-controlled original and publish only a justified, redacted working copy.
Does a PDF preserve the website’s original date?
No. A print date or date shown on the page is only one observation. Your collection log must state when and how you obtained the page, and the native HTML and metadata should be retained when the material may be probative.
Can I rely on a web archive instead of collecting the live page?
An archived copy can corroborate a capture, but it is a different acquisition with its own URL, timestamp and provenance. Preserve it as a separate item and document how it was accessed.
What if the page is deleted after capture?
Do not alter the original files. Preserve the hash, custody log and any lawful corroborating copies, and record the deletion as a later event with its own timestamp.
Quick Recap
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