22 free browser tools

CSV Tools Suite

Convert, clean, merge, compare and query CSV files right in your browser — free, no uploads.

22 tools, one hub Local file tools; service requirements vary Works on any device

What is the fastest way to work with CSV files online?

Pick the CSV tool that matches your job below — convert, clean, merge, compare or query — then drop your file in. File conversion and cleaning run locally. Upload limits vary by tool and device memory; CSV to PDF includes first-page attribution. Processing time depends on the dataset.

Convert CSV

8 tools

CSV to Excel

Popular

Turn CSV data into a formatted .xlsx workbook

CSV to JSON

Popular

Flat or nested JSON from any CSV file

CSV to JSONL

Line-delimited JSON for AI and data pipelines

CSV to XML

Structured XML output with custom tags

CSV to YAML

Readable YAML for configs and fixtures

CSV to PDF

Printable table reports from CSV data

CSV to HTML

Ready-to-paste HTML tables

CSV to Parquet

Columnar Parquet files for analytics

Clean & edit

7 tools

Advanced CSV Editor

Popular

Edit, filter, sort and repair CSV files visually

Remove Duplicates

Popular

Deduplicate rows by any column combination

Remove Empty Rows

Strip blank rows and columns instantly

Trim Whitespace

Clean stray spaces from every cell

Fix Capitalization

Normalise casing across columns

Reorder Columns

Drag columns into the order you need

Transpose Data

Flip rows into columns and back

Combine & analyse

7 tools

Merge CSV Files

Popular

Combine unlimited CSV files into one

Join CSV with SQL

SQL joins across multiple CSV files

SQL Query on CSV

Run SELECT queries against your data

Natural Language Query

Ask questions about your CSV in plain English

Data Dashboard

Charts and cross-filters from a CSV file

Statistical Analysis

Descriptive stats and distributions

CSV ZIP Packager

Bundle and split CSV exports into archives

How it works

  1. 1

    Pick a CSV tool

    Choose from the convert, clean or analyse groups below — each page explains exactly what it does.

  2. 2

    Drop in your file or paste data

    Delimiters, quotes and encodings are detected automatically. Nothing is uploaded.

  3. 3

    Download the result

    Export the converted or cleaned file instantly, then chain another tool if you need to.

Which CSV tool should you use?

Match the job you are trying to do to the right tool, the output you get, and how long it typically takes.

Which CSV tool should you use?
If you need to…Use this toolOutputPerformance
Open a CSV in Excel with formattingCSV to Excel.xlsx workbookDepends on file and device
Feed CSV data to an API or appCSV to JSONJSON / nested JSONDepends on file and device
Build an AI training or fine-tune setCSV to JSONLLine-delimited JSONDepends on file and device
Delete repeated rowsRemove DuplicatesCleaned CSVDepends on file and device
Combine many exports into one fileMerge CSV FilesSingle CSVSeconds
Filter, group or join like a databaseSQL Query on CSVQuery result CSVDepends on file and device
Chart and explore the dataData DashboardInteractive chartsInstant
Share a printable tableCSV to PDFPaginated PDFDepends on file and device

Why people use these tools

File conversion and cleaning process files in your browser

Limits vary by tool; CSV to PDF includes first-page attribution

Local processing requires the tool and its resources to be loaded

Separate developer API with account, quotas and plans

Read the privacy policy or automate these jobs with the developer API.

Frequently asked questions

Everything people ask before using these tools — privacy, file limits, formats and how each job is done.

The browser CSV tools are free. Upload limits vary and CSV to PDF includes first-page attribution. Connected services and the developer API have separate access requirements.

No. CSV processing runs entirely in your browser using JavaScript, so files never leave your device. That makes these tools safe for customer lists, financial exports and other confidential data.

Limits depend on the tool. The shared CSV/Excel uploader accepts up to 55MB; CSV Diff and CSV to Excel have no fixed upload-size cap. Browser memory still limits all local processing.

Open the CSV to Excel tool, drop your .csv file in and download a formatted .xlsx workbook. Headers, column types and delimiters are detected automatically, and the conversion happens locally in your browser.

Use the Merge CSV tool. Add as many files as you like, choose whether to match columns by header name or position, and export a single combined CSV. Mismatched columns can be aligned or dropped before export.

Yes. The CSV Diff tool compares records by row position and highlights added, removed and modified rows so you can review changes between two exports of the same dataset.

The Remove Duplicates tool lets you pick one or several columns as the uniqueness key, previews which rows would be dropped, and exports a deduplicated file.

Yes. SQL Query on CSV and Join CSV with SQL run real SELECT statements — including joins, filters, grouping and aggregates — against your files inside the browser, with no database to set up.

Common delimiters and quoted fields are handled by the CSV parser. UTF-8 is the usual text encoding; explicit delimiter and encoding controls depend on the tool.

Local processing does not upload files, but some tools load extra resources when first used. Offline operation is not guaranteed unless all required resources are already loaded.

Yes. The developer API exposes the same CSV to JSON, JSON to CSV, validation and extraction endpoints with a free tier for automated pipelines.

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