Filethimble: CSV to JSON

Convert a small table into another portable text format, or turn a Markdown note into a PDF. Filethimble supports an explicit local conversion matrix rather than promising every file format. Import or paste CSV, TSV or a supported flat JSON table. Review the rows, choose delimiter and header options, and export CSV, TSV or JSON. A visible formula-safe option can escape spreadsheet formula-like cells. Table routes preserve numeric-looking cells as text; JSON table output contains string values. Keep large integer values quoted to preserve their spelling. Nested JSON, inconsistent fields and malformed tables are rejected instead of silently dropped. Markdown follows a separate route to PDF. Headings, paragraphs, lists and code are rendered into a local printable document. Raw HTML, scripts and external images are not executed or loaded. Markdown PDF output is not a route for converting CSV or JSON to PDF. Inputs are limited to 1 MB of UTF-8 text, 5,000 rows and 100 columns for tables, and 50,000 characters for Markdown. JSON table output has a 4 MB budget. PDF and Word files, video, audio and image conversion are not supported inputs. Save table projects locally, reopen them, and share actual output files without uploading the source for conversion. No account, advertising, subscription or in-app purchase is required. The interface is in English.

Initial release: convert CSV, TSV and flat JSON tables locally, or generate PDFs from Markdown. Includes local project saving, input validation and file export.