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convertcsv.com
ConvertCSV.com is a collection of online tools for converting CSV and Excel data to and from formats such as JSON, XML, SQL, YAML, KML, GeoJSON, HTML, Markdown and PDF. It also provides a CSV viewer and editor, a CSV validator, SQL querying and data extraction tools. The tools run on the client side, so data never leaves the computer.
inloop.github.io
A browser-based viewer for SQLite files. Users drop a file onto the page or open it through a file dialog, and the file is processed locally with JavaScript and HTML5 FileReader rather than uploaded. Tables can be exported to CSV. The page requires a browser with modern HTML5 support.
drlinkcheck.com
Dr. Link Check is a broken link checker that crawls a website from a start URL through its HTML and CSS, examining internal and outbound links plus links to images, style sheets, and other resource files. Each link passes multiple checks, including URL validation, DNS lookup, connect check, SSL certificate check, and HTTP response check. Results can be sorted, filtered, and exported to CSV.
export-youtube-playlist.vercel.app
Export YouTube Playlist is a free web tool that exports public YouTube or YouTube Music playlists to formats such as CSV, Excel, Text, JSON or Bookmark HTML, without sign-up. Users can customize which items and fields to export. No API keys are required.
franchise.cloud
Franchise is an open-source SQL notebook for desktop. It runs a version of the SQLite engine in the browser, so processing happens locally, and users can load CSV, JSON, or XLSX files by dropping them in. A terminal command sets up a database bridge for connecting to PostgreSQL, MySQL, or BigQuery. Published notebooks can be downloaded as HTML documents.
github.com
MinerU is a tool that transforms complex documents such as PDFs and Office documents into LLM-ready markdown or JSON for agentic workflows. It supports multiple input formats including PDF, images, DOC/DOCX, PPT/PPTX, XLS/XLSX, RTF, ODT/ODS/ODP, EPUB, OFD, HTML/MHTML and CSV/TSV. Version 4.0 offers four parsing tiers and a document library with search and citation locators, and documents are not automatically uploaded to the official service; remote parsing requires explicit configuration.
osintracker.com
Osintracker is a browser-based OSINT investigation platform. It maps entities and their relationships in an interactive graph and stores all investigation data locally. Users can run matched OSINT resources and import connector results to expand the graph, then export to HTML, Markdown, CSV, JSON or PNG.
github.com
A CLI tool to convert CSV / Excel / HTML / JSON / Jupyter Notebook / LDJSON / LTSV / Markdown / SQLite / SSV / TSV / Google-Sheets to a SQLite database file.