Join & Merge CSV | 72Tool Free Online Spreadsheet Tool

Join & Merge CSV — a free online CSV & Data tool. Runs entirely in your browser, no upload, no registration, works on phone and desktop.

Join & Merge CSV is a free online tool in the 72Tool toolbox for Spreadsheet tasks. Enter your input to get instant, accurate results — handy for work, development and daily use.

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Join & Merge CSV

主表格（保留所有行）

附表（用于匹配补充字段）

两表关联合并是一款免费的在线表格数据清洗与转换工具，无需下载安装、无需注册登录，打开网页即可使用。支持CSV合并，所有合并操作均在浏览器本地完成，文件不会上传到服务器，充分保护数据隐私。无论使用电脑、平板还是手机，都能直接在浏览器中打开使用。

两表关联合并适用于数据清洗整理、报表格式转换等场景，适合去重、拆分列、格式互转等表格处理需求。作为一款轻量的在线表格数据清洗与转换工具，它免去了安装专业软件的麻烦，随开随用，是日常数据清洗整理中的实用小工具。

使用教程
  1. 点击上传区域，选择本地的文件（支持页面提示的格式）。
  2. 合并顺序按你选择文件的先后排列，注意上传时的顺序。
  3. 点击「关联合并导出CSV」按钮，等待浏览器在本地完成处理。
  4. 处理完成后自动下载结果文件，或在本页结果区查看预览。
常见问题
Q1：编码乱码怎么办？
A：页面默认按 UTF-8 解析，如乱码请确认源文件编码。
Q2：支持多大文件？
A：本地处理，常规文件无压力，超大文件可能较慢。
Q3：数据会上传吗？
A：不会，全部本地。
Q4：分隔符能改吗？
A：部分工具支持自定义分隔符，以页面选项为准。
Q5：两表关联合并支持CSV格式吗？
A：支持，可直接上传CSV文件，在浏览器本地完成合并，文件不会上传到服务器。
Q6：两表关联合并可以在手机上使用吗？
A：可以，本工具基于网页运行，手机、平板、电脑均可直接打开网页使用，无需安装 App。
相关工具
CSV to Excel CSV to JSON Clean CSV Empty Rows Dedupe CSV by Column Fill CSV Blanks Filter CSV CSV Row Counter Merge CSV Files
Features & Use Cases

Join & Merge CSV is a free online CSV & Data tool. No download or registration is required — just open the page and use it instantly. All processing runs locally in your browser, so your files and data never leave your device, keeping everything private.

How to Use
  1. Enter or paste the content you want to process into the input area.
  2. Set any options you need (such as units or modes) from the controls on the page.
  3. Click the action button and let the tool process everything locally in your browser.
  4. View the result, then copy or download it as needed.
FAQ
Q：Is the result accurate?
A：It uses standard algorithms and conversion factors, accurate enough for everyday and work use.
Q：Do I need to install anything?
A：No. It is a pure browser tool — paste your code/text and get the result instantly.
Q：Can I use it on my phone?
A：Yes. It runs in any modern browser on phone, tablet, or desktop — no app install needed.
Q：Is it really free?
A：Yes, this tool is completely free to use, with no login required.
Related Tools
CSV to Excel CSV to JSON Clean CSV Empty Rows Dedupe CSV by Column Fill CSV Blanks Filter CSV CSV Row Counter Merge CSV Files

Note: Join & Merge CSV runs entirely in your browser; your data is not uploaded to any server. Explore more free online tools on the 72Tool homepage.