Free · Secure · Runs in your browser
Free Online Data Format Converter
Convert between CSV, JSON and Markdown tables right in your browser. No sign-up, no upload, instant and privacy-friendly.
Why DataFmt
Client-side only
Every byte is parsed and converted inside your browser. Your data never leaves the device, which keeps sensitive content safe.
Zero setup
No account, no installation. Paste your text, drop a file, or upload one and you are ready to go.
SEO-friendly & bilingual
Every converter has its own URL with pre-rendered content, plus English and Chinese versions for global users and search engines.
Free for any use
Personal, open-source or commercial — DataFmt is free to use with no hidden limits.
Pick a converter
Each tool page includes a full guide and FAQ. Click a card to open its dedicated workspace.
CSV to JSON
Turn any CSV table into clean JSON with a single click.
JSON to CSV
Export JSON arrays to CSV that opens cleanly in Excel or any database.
CSV to Markdown
Turn a CSV table into a GitHub-flavoured Markdown table ready to paste.
Markdown to CSV
Pull a Markdown table out of any document and turn it into clean CSV.
Your data stays with you
DataFmt performs all parsing and conversion in the browser. We do not log, store or transmit the content you paste or upload. It is safe to use on sensitive spreadsheets, personal exports and internal reports.
Typical scenarios
Data analysis & migration
Turn CSV exports from a database into JSON for scripts, or export API responses as CSV for BI tools.
Technical writing
Generate Markdown tables for README files, blog posts and internal wikis in one click.
Team collaboration
Exchange structured data with frontend, backend, product and QA team-mates without manual editing mistakes.
Education & reporting
Transform spreadsheet data into formats that embed cleanly in lectures, training decks and reports.