Useful web tools for SEOs & builders

Fast, polite, privacy-friendly. No sign-up required.

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Dead Link Finder

Scan a page, list, or sitemap for broken links. Robots-aware with redirect chain detection and comprehensive CSV/JSON exports.

Robots-awareHSTS guardWayback links

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Compare two sitemaps to identify added and removed URLs. Get a confidence-scored 301 redirect plan with automatic mapping suggestions.

.xml.gz supportRedirect mapper410 lists

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Find Internet Archive snapshots for dead URLs. Get a complete replacement map with optional HEAD verification and SavePageNow queuing.

HEAD verifySavePageNowBest match

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Convert between 100+ document formats including Markdown, PDF, DOCX, HTML, RTF, and ODT. High-quality PDF rendering with Chromium.

Chromium PDFPandoc engine100+ formats

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Merge two CSV/TSV files on a shared column (like Email or ID). Supports inner and left joins with automatic delimiter detection.

Auto delimiterInner/Left joinsLarge files

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Flatten nested JSON and JSONL logs into spreadsheet-ready CSV, or convert CSV back into JSON arrays without scripts.

JSONL supportNested flatteningUp to 50MB

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Upload a ZIP of PDFs and get back a ZIP of plain text files. Ideal for research corpora, contracts, and AI pre-processing.

Batch PDFsPlain textError report

Use Sitemap Delta to compare old vs new maps, flag risky removals, and export redirect configs (nginx/Apache) before launch.

Dead Link Finder crawls pages, sitemaps, or CSVs with HTTPS/HSTS guards and exports that drop straight into your spreadsheet or CMS.