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NeatUtility

CSV to HTML & HTML to CSV Table Converter

CSV & Tables100% Client-Side
Ready
CSV
0 lines0 chars
0 B / 4.77 MB
About this tool, examples & FAQ

Convert between CSV or TSV tabular files and semantic HTML <table> structures. Generate clean <thead> and <tbody> elements, assign CSS classes, escape cell markup safely, and extract CSV spreadsheets from existing HTML tables without server requests.

Key facts

Verified capabilities and limits of this utility
OperationsCSV → HTML Table and HTML Table → CSV
DelimitersComma (,), Tab (\t), Semicolon (;), and Pipe (|)
HTML Controls<thead> headers, custom table class, minification, and entity escaping
Maximum Input5 MB
Execution Deadline3 s

How to use

  1. Paste your CSV data or HTML <table> snippet into the editor.
  2. Choose your conversion direction: CSV → HTML Table or HTML Table → CSV.
  3. Optionally customize the delimiter, table CSS classes, and minification preference.
  4. Click Convert (or press Ctrl/Cmd + Enter) to generate the target table markup or CSV.
  5. Copy to clipboard or download as .html or .csv.

Examples

CSV to HTML Table Conversion

Input

sku,item,price
A1,Widget,19.99
B2,Gadget,29.99

Example output

<table>
  <thead>
    <tr>
      <th>sku</th>
      <th>item</th>
      <th>price</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>A1</td>
      <td>Widget</td>
      <td>19.99</td>
    </tr>
    <tr>
      <td>B2</td>
      <td>Gadget</td>
      <td>29.99</td>
    </tr>
  </tbody>
</table>

HTML Table to CSV Conversion

Input

<table><tr><th>col1</th><th>col2</th></tr><tr><td>val1</td><td>val2</td></tr></table>

Example output

col1,col2
val1,val2

Edge cases

HTML entity decoding and tag stripping

When parsing existing HTML tables to CSV, inner formatting tags like <span>, <b>, or <a> are stripped while HTML entities (e.g. &amp;, &lt;, &quot;) are decoded into plain text characters.

Spreadsheet formula injection protection

When extracting data from untrusted HTML web pages into CSV, cell values beginning with '=', '+', '-', or '@' are prefixed with an apostrophe to protect against macro execution in spreadsheet programs.

Irregular cell counts in HTML tables

HTML tables with merged cells or uneven row definitions are normalized by collecting all cells per <tr> into contiguous rows for consistent CSV generation.

How it works

  1. Parses input CSV rows via PapaParse or extracts <tr> and <td>/<th> nodes from HTML strings.
  2. Generates semantic HTML with proper <thead>, <tbody>, and indentation or minified format.
  3. Sanitizes spreadsheet formulas and HTML entity characters where appropriate.
  4. Executes entirely in a client-side Web Worker without transmitting document content.

Related workflows

Frequently asked questions

Can I add Bootstrap or Tailwind CSS classes to the generated HTML table?

Yes. Set the 'Table CSS Class' option to any class list (such as 'table table-bordered table-striped' or 'w-full text-left border') to automatically inject the class attribute into the <table> tag.

What happens if my CSV contains HTML code?

By default, 'Escape HTML in Cells' converts characters like < and > into &lt; and &gt;, ensuring cell content is rendered safely as visible text rather than executed as browser markup.

Is my HTML or CSV table sent to a server?

No. All parsing and formatting happens 100% locally in your web browser. No text or data ever leaves your device.

References