Free Bulk URL Status Checker
Paste up to 50 URLs, get HTTP status codes, redirect destinations, and response times in one click. Find broken links, redirect chains, and slow pages in bulk. Free SEO tool, CSV export, no signup.
Quick Answer
A bulk URL status checker fetches a list of URLs in parallel and reports the HTTP status (200, 301, 404, 500, etc.), the redirect destination if any, and the response time. SEO teams use it to audit internal links, sitemap entries, and outbound link lists; the U2L checker handles up to 50 URLs per run with CSV export.
Quick Facts
- Checks up to 50 URLs in parallel per run; results back in 5-10 seconds for typical lists.
- Reports HTTP status (2xx OK, 3xx redirect, 4xx broken, 5xx server error), redirect destination, and per-URL response time.
- Uses HEAD requests by default and falls back to GET if the server rejects HEAD with 405 or 501.
- All processing runs server-side via /api/tools/bulk-url-checker on Cloudflare Workers; private and loopback URLs are blocked for safety.
- Export results to CSV for SEO audits, broken-link reports, or content team handoff.
- No signup required; no API key. For higher volumes (10k+ URLs), use the public U2L API on a paid plan.
- Filters: see only OK, only redirects, only broken (4xx/5xx), or only timeouts.
How to bulk-check URL status codes
Three steps. Paste, check, export.
- 1
Paste your URLs (one per line)
Drop a list of URLs into the textarea, one per line. Up to 50 per run. URLs without https:// are accepted; the tool prepends it automatically. Mixed http/https supported.
- 2
Click Check URLs
The tool fires HEAD requests in parallel (8 concurrent), each with a 5s timeout. Results stream back into a sortable table within 5-10 seconds for a 50-URL list.
- 3
Filter, sort, or export to CSV
Filter to broken (4xx/5xx) only, sort by response time, or export the full results to CSV for sharing with your SEO or content team.
What is a Bulk URL Status Checker?
Bulk URL Status Checker is a tool that fetches a list of URLs in parallel and reports each URL's HTTP status code, redirect destination, and response time. Instead of clicking each URL one-by-one in a browser or running curl 50 times, the bulk checker tells you in seconds which URLs are OK (2xx), which redirect (3xx), which are broken (4xx/5xx), and which time out.
SEO teams run bulk URL status checks during site migrations, sitemap audits, and broken-link sweeps. After a domain change or CMS migration, hundreds of URLs may have moved. Bulk checking the old sitemap against the new domain catches missing redirects before they bleed traffic. Outbound-link audits use the same tool to find dead external links in old blog posts.
Affiliate marketers and ecommerce content teams use bulk checkers to audit product link lists. Affiliate networks frequently rotate URLs; a 404 on a product link means lost commission. Running the catalog through a bulk checker once a quarter catches the rot before customers do.
Developers and QA teams audit redirect chains during deployments. A staging site with broken redirects, a 500 page on a particular endpoint, or a slow internal API surfaces fast in the table view. The CSV export ships straight into Jira tickets or status reports.
How does a Bulk URL Status Checker work?
When you paste a list and click Check URLs, the browser POSTs the array to /api/tools/bulk-url-checker on Cloudflare Workers. The server validates each URL, blocks private and loopback addresses to prevent SSRF, then fans out HEAD requests with a concurrency limit of 8 and a per-URL timeout of 5 seconds.
HEAD is preferred over GET because it returns the response headers without the body, saving bandwidth and time. About 5% of servers reject HEAD with 405 Method Not Allowed or 501 Not Implemented; the checker falls back to GET in those cases (and immediately cancels the body stream to keep memory usage low).
Redirects are reported with their target URL but NOT followed multiple hops. For full redirect chain tracing, use the dedicated /tools/redirect-checker. The bulk checker is optimized for speed: one hop reported per URL, then move on to the next URL.
Results stream back as a single JSON payload once all URLs complete. For a 50-URL list with normal response times, total time is dominated by the slowest URL plus a small concurrency overhead - typically 5-10 seconds. Slow or timing-out URLs cap at the 5-second timeout and are reported as errors.
Use Cases
How marketers, businesses, and developers use bulk url status checker.
SEO sitemap audits
Drop your sitemap URLs into the checker after a CMS migration or domain change. Catch 404s, broken redirects, and 500s before Google re-crawls and drops you from search.
Outbound link audit on old blog posts
Run external links from a high-traffic blog post through the checker. Replace dead outbound links to maintain article quality and avoid Google quality-rater dings.
Affiliate link rot detection
Affiliate networks rotate product URLs constantly. Run your catalog through the checker quarterly; replace 404s and 410s before customers click and bounce.
Internal-link sweep
Export internal links from your CMS to a list. Bulk-check identifies broken in-page links that hurt navigation and crawl efficiency.
Redirect-rule QA after deploys
Deploy a batch of 301 redirects? Run the old URLs through the checker to confirm each one actually redirects, returns the right status, and lands at the expected destination.
Competitor link monitoring
Track competitor URLs (pricing pages, sign-up flows) for status changes. A sudden 404 on a competitor's pricing page often signals a relaunch or rebrand worth noting.
Backlink profile cleanup
Disavow lists need accurate URLs. Bulk-check potential disavow URLs to confirm they still exist before submitting to Google.
PR and outreach link verification
Before sending a press release with embedded links, bulk-check every URL once. Embarrassing 404s in published PR copy are easy to avoid.
Newsletter pre-send check
Email newsletters with broken links erode subscriber trust. Drop your draft's URLs into the checker as a pre-send QA step.
Documentation external links
Technical docs frequently link to external API references and tutorials. Quarterly bulk-checks catch dead doc links before they confuse readers.
Bulk URL Status Checker vs Alternatives
Side-by-side feature and pricing comparison with the top alternatives.
| Feature | U2L | Screaming Frog | httpstatus.io | Sitebulb | Manual curl |
|---|---|---|---|---|---|
| Free in browser | 500 URLs free | Trial only | |||
| Bulk paste textarea | Up to 50 | Up to 100 | |||
| CSV export | Manual | ||||
| Per-URL response time | Manual | ||||
| Redirect destination shown | |||||
| No install required | |||||
| API for higher volumes | Coming soon | Desktop app | Desktop app | ||
| Sortable, filterable results | Limited |
Bulk URL Status Checker vs Screaming Frog
Screaming Frog is the industry-standard SEO crawler with deep analysis of internal links, redirects, on-page SEO, and rendered HTML. Free up to 500 URLs; paid (~$259/year) for unlimited.
U2L's bulk URL checker is a focused subset: paste a list, get statuses, export. For full-site crawls, redirect chain tracing, or rendered-HTML inspection, Screaming Frog wins. For a fast 50-URL list check without installing a desktop app, U2L wins.
Bulk URL Status Checker vs httpstatus.io
httpstatus.io is a free web tool offering bulk URL status checking with up to 100 URLs per run. Clean UI, well-respected in the SEO community.
U2L's checker is functionally similar at smaller volumes, with the addition of redirect destination shown inline, response-time sorting, and integration with the broader U2L toolset (redirect chain tracer, OG checker, etc.) when you need to drill into a specific URL.
Best Practices
Run bulk-checks regularly, not just after migrations
Quarterly bulk-checks of high-value pages (top 50 by traffic, top 50 by backlink) catch link rot before it impacts SEO. Set a calendar reminder.
Export to CSV before drilling into specific URLs
The CSV is your audit log. Save it before fixing anything; you'll want a before/after diff to show stakeholders what improved.
Use redirect-checker for deeper chain tracing
Bulk-check shows one redirect hop. For URLs that redirect through multiple hops (CDN -> staging -> prod), use /tools/redirect-checker to trace the full chain.
Re-run timeouts after a few minutes
5s timeout is aggressive. A timeout might mean the URL is slow but still alive. Re-run timed-out URLs separately before flagging them as broken.
Group URLs by domain for cleaner audits
Run all URLs from one domain together, then move to the next. Mixing domains makes it harder to spot domain-wide issues (e.g. all youtube.com URLs slow today).
Trust HEAD but verify GET for unusual hosts
Some servers (especially older WordPress installs) return wrong status codes on HEAD. If a HEAD result looks suspicious, manually GET that URL to verify.
Coordinate with your CDN cache after fixing 404s
A fixed 404 may still serve cached on Cloudflare or your CDN for hours. Purge the URL from cache after fixing to avoid the bulk-checker reporting stale 404s on the next run.
Don't bulk-check during a known incident
If your site is having an outage, the bulk-checker will return all 5xx or timeouts. Wait for the incident to resolve before running an audit.
Common Mistakes to Avoid
Pasting more than 50 URLs
The free tier caps at 50 per run to keep latency reasonable on Cloudflare Workers. For larger lists, split into batches or use the U2L API on a paid plan.
Treating 3xx as errors
A 301 or 302 is healthy if the redirect destination is correct. Filter to redirects-only and verify each lands where you expect; only flag broken redirects (308 to 404, etc.).
Trusting one-time results
A URL that returns 500 today might return 200 tomorrow. Re-run the same list 24 hours later for transient errors before reporting them as bugs.
Including private/internal URLs
URLs on localhost, 127.0.0.1, 10.x.x.x, etc. are blocked. Internal staging URLs need to run through a tool inside your VPN (or use Screaming Frog desktop).
Ignoring redirect destination when reviewing results
A 301 to a 404 is broken. The bulk-checker shows the redirect destination - always check that the destination URL is also alive.
Bulk-checking your own site under load
If your origin server is small, 8 concurrent requests can saturate it. Run during low-traffic hours or test against staging.
Confusing response time with TTFB
The reported time is server response time including network round trip from Cloudflare to the origin. Real-user TTFB depends on the visitor's location and may differ.
Technical Specifications
| Max URLs per request | 50 |
| Concurrency | 8 in-flight requests |
| Per-URL timeout | 5 seconds |
| Default method | HEAD with GET fallback on 405/501 |
| Redirect tracking | 1 hop reported (use /tools/redirect-checker for full chains) |
| User-Agent | Chrome 124 desktop UA |
| Backend | Cloudflare Workers via /api/tools/bulk-url-checker |
| SSRF protection | Loopback, RFC1918, link-local, and cloud-metadata IPs blocked |
| Output formats | Live table + CSV download |
Industry-Specific Use Cases
SEO agencies
Sitemap audits, redirect QA after deployments, outbound-link sweeps for client-site quality reports. CSV export plugs straight into client deliverables.
Affiliate marketers
Quarterly catalog checks across hundreds of affiliate links. Catch dead products before traffic clicks through and bounces.
Content marketing teams
Pre-publish QA on outbound links in long-form articles. Pre-send QA on email newsletter URLs.
Developers and QA
Post-deploy redirect verification, internal-link auditing, doc-site external-link health checks.
PR and communications
Verify every URL in a press release or blog post before it goes out. Embarrassing 404s in published copy are easy to avoid.
Ecommerce ops
Product page audits, catalog freshness checks, supplier deep-link verification before promotion.
Frequently Asked Questions
How many URLs can I check at once?
Does it follow all redirect hops?
What's the difference between this and Screaming Frog?
Why does my URL show 'timed out'?
Can I check URLs behind authentication?
Does it work for localhost or internal URLs?
Are 3xx redirects errors?
How do I export the results?
Is HEAD reliable?
What user-agent does the checker use?
Will repeated checks get me blocked?
Does U2L log my URLs?
Can I bulk-check multiple domains in one run?
Does this work for non-HTTP protocols?
How do I check more than 50 URLs?
Why does response time vary between runs?
Does it work for URLs behind Cloudflare?
Can I sort or filter the results?
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Key Terms
- HTTP status code
- A 3-digit number returned by a server in response to an HTTP request. 2xx = success, 3xx = redirect, 4xx = client error (404 Not Found), 5xx = server error (500 Internal Server Error).
- HEAD request
- An HTTP method that returns response headers without the body. Used by status checkers to save bandwidth - the headers contain everything needed (status, redirect location, content type).
- Redirect chain
- A series of HTTP redirects from an original URL to a final destination. Long chains (more than 2 hops) hurt SEO and add latency. The bulk-checker shows one hop; use /tools/redirect-checker for the full chain.
- SSRF
- Server-Side Request Forgery - an attack where a malicious user tricks a server into fetching internal/private URLs. The bulk-checker blocks loopback, RFC1918, and cloud metadata addresses to prevent SSRF.
- TTFB
- Time To First Byte - the time from request start to the first byte of response received. The 'time' column in results is roughly TTFB plus DNS lookup; it correlates with but isn't identical to user-perceived TTFB.
- Sitemap
- An XML file listing all URLs a site wants Google to index. Bulk-checking your sitemap quarterly catches 404s and broken redirects before Google de-indexes the URLs.
Need to check thousands of URLs?
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