Broken link checker
DeadLinkTool is a free link integrity toolkit for checking and fixing broken links in website pages, PDFs, Markdown files, GitHub READMEs, and GitLab docs.
Start with the checker that matches your content. You can review results for website pages, edit and export Markdown, and update supported links inside PDFs without rebuilding the whole file.
Each checker fits a different kind of source, so it is easier to start in the right place.
Website checker
Check broken links on a public page before a launch, after a migration, or during an SEO cleanup.
Internal links
Review same-domain links on a page so navigation, content links, and crawl paths stay clean.
Backlink checks
Open a page that links to you or a prospect page, then review dead outbound links that may need outreach or redirects.
GitHub and GitLab
Made for GitHub READMEs, GitLab docs, changelogs, setup guides, and Git-based documentation.
PDF files
Useful for brochures, reports, manuals, forms, and other PDFs that people still download and share.
Markdown, READMEs, and Git docs
Made for GitHub READMEs, GitLab docs, knowledge bases, changelogs, setup guides, and Git-based docs.
Start from the wording that matches the cleanup job in front of you.
Check broken links, 404s, blocked URLs, and working links from a public website page.
Separate same-domain links from external links and focus on internal 404 cleanup.
Review backlink source pages and backlink prospects for dead outbound links.
Check README links, repo docs, GitLab pages, and Markdown paths that break after files move.
Paste Markdown or a supported repo URL, fix bad targets, and export clean Markdown.
Scan PDF links, validate internal destinations, and patch supported external PDF URLs.
Start with a focused guide when you already know the symptom you need to solve.
Prioritize internal 404s, update source links, and use redirects only when they help users.
Understand file moves, branch changes, renamed anchors, and export paths in Git docs.
Recover lost link value with relevant redirects, cleanup scans, and backlink source checks.
Map old URLs to useful replacements, clean internal links, and avoid redirect noise.
Separate access-control blocks from truly broken URLs before changing content.
Recover valuable external links with relevant redirects and focused outreach.
Clean product, collection, navigation, and campaign links without slowing the store.
Fix CMS slug changes, archived pages, and redirect gaps after Webflow publishes.
Find dead references on resource pages and qualify useful replacement opportunities.
Patch supported external PDF URLs when the PDF layout is still correct.
These are the teams and tasks this tool is most useful for.
Review broken internal and outbound links before they turn into dead ends on important pages.
Catch broken README, docs, and changelog links after files move, branches change, or repos get reorganized.
Check PDFs used for forms, applications, onboarding packs, policies, manuals, and other downloadable documents.
Helpful guides for the questions people usually hit when links break across websites, PDFs, and docs.
Todo lo que necesitas saber sobre salud de enlaces, correcciones de markdown, flujos Git, impacto SEO y cómo usar nuestras herramientas.
Un enlace roto es un hipervínculo que ya no funciona porque el sitio web tiene problemas. Normalmente resulta en un error 404.
Los enlaces rotos dañan la experiencia del usuario y el SEO. Crean callejones sin salida y señalan falta de mantenimiento.
¡Sí! Nuestra herramienta está diseñada para Markdown. Puedes pegar tu contenido o usar una URL.
Sí. Usa la pestaña PDF para escanear una URL publica de PDF o subir un archivo. Validamos enlaces externos y tambien destinos internos del PDF.
Sí. Para URLs PDF externas, usa el panel de reparación PDF para cambiar el destino, opcionalmente actualizar el texto visible y descargar un PDF corregido.
Absolutamente. Demasiados errores 404 desperdician el presupuesto de rastreo y disminuyen la calidad de tu sitio.
Recomendamos un escaneo completo al menos una vez al mes, o con cada cambio estructural importante.
Copia y pega el contenido Markdown directamente en nuestra pestaña 'Markdown' para un escaneo local seguro.
Esto sucede si un sitio bloquea robots (Cloudflare) o si la respuesta del servidor expira.
Ayuda a los motores de búsqueda a rastrear más eficientemente, eliminando obstáculos.
Resolvemos rutas (ej: ./docs/setup.md) analizando la estructura base del repositorio.
Website pages, PDFs, and Markdown files each have their own checker, so you can jump straight into the right workflow.