Convert CSV to HTML tables and JSON without a spreadsheet
CSV files from spreadsheet exports are useful, but spreadsheet software is overkill when you just need to convert them to HTML for a website or JSON for an API. Downloading a 2 MB spreadsheet file, opening it in desktop software, waiting for it to load, making your edits or conversions, then exporting again is busywork. With browser-based tools that run entirely on your machine, you can transform CSV data into clean HTML tables or structured JSON in seconds—no installation, no upload, no account required. The payoff is instant: fewer steps, less friction, and your data never leaves your browser.
Why convert CSV at all?
CSV (comma-separated values) is the most portable data format, exported by nearly every accounting tool, CRM, database, and analytics platform. But it's plain text, and web browsers and APIs expect actual structure. A CSV export from your accounting tool or database query needs to become an HTML table for a report you're embedding on your website, or JSON to feed your API backend, or a cleaned dataset for further processing or analysis. Spreadsheet software works, but it's heavyweight and repetitive: download, open, wait for the bloat to load, make your changes, save, export, then move the file somewhere else. A converter running in your browser skips all that ceremony, letting you focus on the work.
HTML tables vs JSON—which format to use
HTML tables are ideal when you need to display data on a webpage. They're semantic HTML, searchable by search engines, printable by users, and accessible to screen readers. JSON, by contrast, is the right choice for APIs, databases, configuration files, or any workflow where you're feeding structured data into another system—it's the lingua franca of backend services. Some projects need both formats at different stages. The good news: converting to either format takes the same effort. Tools like converting CSV to HTML and converting CSV to JSON handle each format natively, parsing your input and emitting valid, well-formed output. You pick the format that suits your next step, and the conversion is instant.
Handling commas, semicolons, and tabs
Not all CSVs use commas as the delimiter. European spreadsheet software—Microsoft Excel in German-speaking countries, for example—defaults to semicolon delimiters to preserve commas within cell values, since commas are decimal separators in those locales. Tab-separated values (TSV) are common in Unix pipelines, bioinformatics research, and data dumps from legacy systems. If your converter assumes commas and your file uses semicolons, the parser misinterprets each row as a single column, and every cell value gets mangled. The CSV delimiter detection tool lets you identify and switch delimiters on the fly. Paste your CSV variant—semicolon, tab, pipe, or any single character—and preview how it parses. Once you've confirmed the right delimiter, converting to HTML or JSON works flawlessly.
Deduplicating rows by column
Real-world data is messy. CSV exports often contain exact duplicate rows—the result of sloppy data entry, system glitches, or aggregating data from multiple sources. Other times duplicates are identified by a key column, such as customer ID or email address, where you want to keep only the first occurrence and remove the rest. Before converting to JSON for your database or HTML for publication, cleaning duplicates ensures data integrity and prevents downstream errors. The deduplication tool removes exact duplicates or filters by a key column of your choice, keeping only the first value and removing subsequent rows with the same key. Clean data in, clean HTML or JSON out.
No upload, no account—everything stays private
Browser-based converters in the TextArray suite run entirely on your machine. Paste your CSV into the input, choose your format and delimiter, and get your output instantly. Nothing is uploaded to a server, no account is required, and the tools work just as well without an internet connection after they've loaded once. That means your data stays private, conversions are instant, and you're not dependent on anyone's uptime but your own browser.
Get started now
Open convert CSV to HTML or convert CSV to JSON depending on your output format. Paste or drag your CSV file into the input. If the delimiter isn't comma, use the delimiter tool first to check and adjust. If you need clean data, run your CSV through the deduplication tool before conversion. Copy the output, paste it where it belongs—a document, email, database, or website code—and you're done. No spreadsheet, no download, no friction.