Convert TSV to HTML Online

Paste a TSV table below, edit it if you need to, and get HTML back. The conversion runs in your browser, so nothing is uploaded, there is no size limit and there is no signup.

From

From a page

The only part of this site that uses a server. The address is sent to it so the page can be fetched, because a browser is not allowed to fetch someone else's page itself. Your own files are never involved.

Nothing here is uploaded. The parsing happens on this page.

Edit

Paste or upload something above and it will appear here.

ToDataMarkupDocumentsCodeSchemasImages

Header rowDetect numbersclassWrap in a div

The output will appear here once there is a table to convert.

What TSV is

TSV is CSV with tabs instead of commas. Because tabs almost never appear inside a value, quoting is rarely needed and the files are easier to read by eye.

Bioinformatics, log processing, and anyone who has copied a block of cells out of a spreadsheet: the clipboard format is TSV.

What HTML is

An HTML table is a table element containing thead and tbody, with th cells for headers and td cells for data.

Web pages, email templates and anything pasted into a CMS.

What changes when you convert TSV to HTML

The tab is unambiguous, so there is no delimiter to guess. This is the most reliable of the delimited formats to read.

Semantic markup: a real thead, a real tbody, th for the header row. Angle brackets and ampersands in your data are escaped, so a value like <script> is written safely and shows as text on the page.

What carries over from TSV to HTML

One property of the TSV has no home in HTML, and it is worth knowing which before you convert.

HTML marks its header cells differently from its data cells, so the first row is written with that marker.

TSV can be read one record at a time. HTML has to be complete before it means anything, so the whole table is held in memory while it is written and a file that gets cut off part way through is not partly usable - it is unusable.

The identifier 007 comes out of the HTML as 007. Reading it as a number would have made it 7, and an id that changes value is worse than one that stays text.

The role "Analyst, data" survives with its comma, in one cell rather than split across two. That is the first thing to check in any converted table, and the usual place a HTML file goes wrong.

The quotes around Jonah "Jo" Pryce are written as the HTML entity " in the HTML.

A worked example

Three rows of staff data, with an identifier that has a leading zero, a value containing a comma, a value containing quotes and one blank cell. Those are the four places formats disagree, so they are the four places to look.

TSV in

id	name	role	started	hours
007	Halima Yusuf	Analyst, data	2024-03-15	38.5
012	Jonah "Jo" Pryce	Engineer	2025-11-02	
104	Wei Chen	Manager	2023-06-30	40

HTML out

<table>
  <thead>
    <tr>
      <th>id</th>
      <th>name</th>
      <th>role</th>
      <th>started</th>
      <th>hours</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>007</td>
      <td>Halima Yusuf</td>
      <td>Analyst, data</td>
      <td>2024-03-15</td>
      <td>38.5</td>
    </tr>
    <tr>
      <td>012</td>
      <td>Jonah &quot;Jo&quot; Pryce</td>
      <td>Engineer</td>
      <td>2025-11-02</td>
      <td></td>
    </tr>
    <tr>
      <td>104</td>
      <td>Wei Chen</td>
      <td>Manager</td>
      <td>2023-06-30</td>
      <td>40</td>
    </tr>
  </tbody>
</table>

Questions

How do I convert TSV to HTML?

Paste your TSV into the box above or drop the file onto it. Check the table in the grid, then copy or download the HTML from the output panel. It takes one step and the data never leaves your browser.

Is there a limit on file size?

No. The work happens on your own machine, so the limit is your machine's memory rather than an upload cap. A file with tens of thousands of rows converts in a second or two.

Is my data uploaded anywhere?

No. The parsing and generating are done by JavaScript running on this page. You can watch the network tab while you convert and see that nothing is sent.