Free Site Migration Tool: Old vs New Crawl Diff
Paste the crawl from before the migration and the crawl from after. Get a launch readiness score, a critical indexability flip report and fix tickets, all in your browser.
How to Run Migration QA Before You Launch
A migration ships on vibes until someone diffs the two crawls. This tool makes that diff a five minute job instead of a spreadsheet weekend:
- Export the old crawl. Crawl the site before you move it, or use the last crawl from your crawler tool. Screaming Frog and Sitebulb CSVs both work. Save it as CSV.
- Export the new crawl. Crawl staging or the live migration with the same settings. Paste both exports into the boxes or load them as files. Columns are detected by header name and shown so you can confirm the mapping.
- Read the gate. The readiness score grades the launch from 0 to 100 with per-component sub-scores. The red banner above everything lists indexability flips, the single most expensive migration mistake.
- Review by pattern, then ship tickets. The template tab rolls thousands of URLs into path patterns like /blog/{slug}/. Download the fix tickets CSV with severity, evidence, suggested fix and effort for every finding.
Got a redirect map? Paste it too. The score adds a redirect coverage component, and the Redirects tab reports chains, many-to-one consolidations and invalid one-to-many rules against your old crawl.
What the Migration QA Tool Checks
Most migration checks are checklists you tick by memory. This one compares the actual crawls:
- Indexability flip detector. Every paired URL is checked for an indexable to noindex change and listed in a critical table with the old and new value side by side. Indexable pages that vanish from the new crawl without a redirect get the same critical treatment.
- Field by field diff. Title, H1, meta description, canonical path, meta robots, HTTP status and word count changes are grouped per field. Canonicals that only changed host are counted separately, because that is expected when the domain moves.
- Content shrink detection. Pages that lost 30 percent or more of their word count are flagged with both totals, which catches templates that silently dropped article bodies during replatforming.
- Path template rollup. Added, removed and changed URLs are grouped by path shape, so a ten thousand URL migration becomes a dozen template rows to review instead of ten thousand.
- Cross-domain pairing. When the hosts differ, URLs are paired by path automatically and the report says so. Pages that changed path show up honestly as removed plus added.
- Redirect map analysis. Coverage against the old crawl, chain detection for targets that still live on the old host, many-to-one consolidation groups and one-to-many rules that no redirect engine accepts.
After launch, confirm the redirect chains with the Redirect Chain Checker and revalidate locale networks with the Hreflang Checker, both of which break silently during replatforming. For a prioritized plan across the whole site, our SEO audit services rank migration fixes by revenue impact.
SEO Migration Checklist: What This Tool Verifies
The technical half of a website migration SEO checklist covers indexability, redirects, titles, H1s, meta descriptions and canonicals. This site migration checklist tool checks that half automatically by diffing the old crawl against the new crawl. Treat it as your website migration checklist gate: nothing ships while the readiness score sits in the red. When the gate passes, download the fix tickets and clear the remaining items by hand.
Related Free SEO Tools by Clienvora
- Redirect Chain Checker - Verify every mapped redirect lands in one hop.
- Hreflang Checker - Confirm return links survived the replatform.
- Canonical Tag Checker - Check canonicals on the new templates.
- Log File Analyzer - Watch Googlebot re-crawl the new structure.
Frequently Asked Questions
What is an SEO migration checklist?
An SEO migration checklist lists everything that must survive a site migration: indexability, redirects, titles, H1s, meta descriptions and canonicals. Migration QA turns that list into a diff. You export a crawl from the old site and a crawl from the new site, and this tool checks them field by field so nothing changes by accident.
Which crawl exports does this tool accept?
Any CSV or TSV with a URL column works. Screaming Frog, Sitebulb and generic crawler exports are auto-detected by header names like Address, URL, Title, H1-1, Meta Description, Canonical, Indexability and Word Count. The detected columns are shown above the results so you can confirm the mapping before you trust the diff.
What is an indexability flip and why is it critical?
An indexability flip is a URL that was indexable in the old crawl and carries a noindex directive in the new crawl. Search engines will drop those pages from the index after launch. It is the single most expensive migration mistake, so the tool prints it in a red critical banner before anything else.
How is the migration readiness score calculated?
The score is a weighted average of the components your data supports: indexability preservation at 35 points, redirect coverage at 20, title retention at 20, H1 retention at 10, meta description retention at 10 and canonical retention at 5. Each component shows its own sub-score so you know what drags the launch gate down.
Do I need a redirect map?
No. The crawl diff works without one. Paste an old_url,new_url CSV and the tool adds the redirect component to the score, measures coverage against the old crawl and reports chains, many-to-one consolidations and invalid one-to-many rules.
Is my crawl data uploaded?
No. CSV parsing, the diff and scoring run in your browser. Crawl exports from client migrations are confidential, so nothing is sent to a server and nothing is stored after you close the tab.