Our Network


Coming Soon


Coming Later

CSV Validator

World's Simplest CSV Tool

Free online CSV validator and linter. Just upload your CSV file in the form below and it will be automatically checked for correct formatting and content. In the tool options, you can specify the input CSV file format (its delimiter and quote character) and choose whether comments, empty lines, missing values, leading and trailing whitespaces in the CSV are errors or not. Created by programmers from team Browserling.

᠎᠎᠎          Tool Options

Delimiter and Quote

CSV value separator.
(The default is a comma.)
CSV value quote character.
(The default is a double quote.)

Allowed CSV Format

Lines starting with this character
are not marked as errors.
Empty lines are not marked
as errors.
CSV files with missing data
are not marked as errors.

Allowed CSV Format

Spaces, tabs, and line breaks
at the beginning of fields are
not marked as errors.
Spaces, tabs, and line breaks
at the end of fields are not
marked as errors.

Error Limit

Show this many errors at once.

What Is a CSV Validator?

This tool performs a thorough validation of CSV (Comma Separated Values) files by analyzing the data. It checks if the file follows commonly accepted CSV standards (such as RFC 4180) and helps you to ensure that its structure is correct and it's ready for further use in various data analysis programs. This validation process is also known as linting. In the tool options, you can specify the key formatting symbols, such as the delimiter and quote character. In most cases, a comma serves as the delimiter in CSV files and a double quote is considered the quote character. If your file uses a different formatting, you can change the key symbols in the options. For example, you can also validate a Semicolon-Separated Values file (SSV), a Tab-Separated Values file (TSV), or a Pipe-Separated Values file (PSV). Based on your requirements for the CSV file, you can choose filters for error detection. Specifically, if you want to make sure the CSV file doesn't contain comments, you can specify the comment character (usually "#" or "//") in the options and disable the "Allow Comments" checkbox. If you want to make sure the file does not contain empty lines or lines consisting only of whitespace characters, you can disable the "Allow Empty Lines" checkbox. If it is important that the CSV file is complete and has no missing values, then you can turn off the "Allow Incomplete Data" checkbox. Additionally, you can check for leading or trailing whitespaces in the fields by adjusting the respective checkboxes. The program also automatically checks the correct usage of quotes in the file, as well as the validity of the delimiter and comment character. If the input CSV passes these checks and is deemed a valid CSV file, the program will display a green badge indicating successful validation. If any errors are detected in the input file, the program will display a red warning badge and list all the found errors. By default, the first 10 errors are printed on the screen at once, but you can set the output limit in the options if you want to see more or fewer errors. Csv-abulous!


CSV Validator Examples

Click to try!

Validate a CSV File

In this example, we validate a CSV file containing street names and numbers against the CSV standard (RFC 4180). To do it, we specify that the input data uses a comma as the delimiter. As a result, we get a green badge that affirms that the input data has a valid CSV format and there are no mistakes or errors.

street,number Oak Street,723 Main Avenue,289 Maple Lane,567 Elm Street,127 Pine Avenue,435 Birch Lane,651
Required options
These options will be used automatically if you select this example.
CSV value separator.
(The default is a comma.)
CSV value quote character.
(The default is a double quote.)
Lines starting with this character
are not marked as errors.
Empty lines are not marked
as errors.
CSV files with missing data
are not marked as errors.
Spaces, tabs, and line breaks
at the beginning of fields are
not marked as errors.
Spaces, tabs, and line breaks
at the end of fields are not
marked as errors.
Show this many errors at once.

Check a Quoted CSV

In this example, we upload a CSV file containing currency information and run our CSV linter program on this file. Since it uses a semicolon to separate fields, we specify this symbol in the input delimiter option. Additionally, we indicate that this file uses double quotes for quoting values. After linting the file, the program displays a red badge indicating that the file has an incorrect CSV format. In particular, it prints that that there's a missing quote on the seventh row and a quoted field is unterminated.

Country;Currency;Symbol United States;USD;"$" European Union;EUR;"€" Japan;JPY;"¥" United Kingdom;GBP;"£" China;CNY;"¥" Australia;AUD;"$
Error 1 title: Missing Quote message: Quoted field is unterminated. row: 7
Required options
These options will be used automatically if you select this example.
CSV value separator.
(The default is a comma.)
CSV value quote character.
(The default is a double quote.)
Lines starting with this character
are not marked as errors.
Empty lines are not marked
as errors.
CSV files with missing data
are not marked as errors.
Spaces, tabs, and line breaks
at the beginning of fields are
not marked as errors.
Spaces, tabs, and line breaks
at the end of fields are not
marked as errors.
Show this many errors at once.

Identify Multiple Errors in CSV

In this example, we use this tool to identify several errors in the given CSV file. The input data, containing color names and their hex codes, has a somewhat messy format. Using the checkboxes in the options, we set strict validation rules that disallow comments (starting with "//"), empty lines, and incomplete data. As a result, we get a red message and four errors: one for the presence of empty lines, two for the presence of comments, and another one for the line with missing data.

Color Name,Hex Code Red,#FF0000 //Green,#00FF00 Blue,#0000FF Yellow,#FFFF00 Black,#000000 White,#FFFFFF Orange,#FFA500 Purple,#800080 Pink //Gray,#808080
Error 1 title: CSV Contains Empty Lines message: The file contains empty lines. row: 2 Error 2 title: CSV Contains Comments message: The file contains comments starting with "//". row: 4 Error 3 title: Incomplete CSV Data message: The file has missing values. row: 11 Error 4 title: CSV Contains Comments message: The file contains comments starting with "//". row: 12
Required options
These options will be used automatically if you select this example.
CSV value separator.
(The default is a comma.)
CSV value quote character.
(The default is a double quote.)
Lines starting with this character
are not marked as errors.
Empty lines are not marked
as errors.
CSV files with missing data
are not marked as errors.
Spaces, tabs, and line breaks
at the beginning of fields are
not marked as errors.
Spaces, tabs, and line breaks
at the end of fields are not
marked as errors.
Show this many errors at once.

Identify Leading and Trailing Spaces

In this example, we check a CSV file for the presence of leading and trailing spaces in the fields. Spaces at the beginning or end of values interfere with data processing operations such as filtering, comparison, or sorting. Additionally, data may be incorrectly processed during import/export, and numeric data in fields may be mistakenly recognized as text. To detect leading and trailing spaces in the specified CSV, we disable the "Allow Leading Spaces" and "Allow Trailing Spaces" checkboxes. As a result, we get three error messages identifying leading and trailing spaces on lines 2, 4, and 7.

Animal,Food Lion ,Meat Zebra,Grass Snake, Rodents Monkey,Fruits Cow,Grass Giraffe,Leaves Chicken,Seeds Panda,Bamboo
Error 1 title: CSV Contains Trailing Spaces message: The file contains trailing spaces. row: 2 Error 2 title: CSV Contains Leading Spaces message: The file contains leading spaces. row: 4 Error 3 title: CSV Contains Leading Spaces message: The file contains leading spaces. row: 7
Required options
These options will be used automatically if you select this example.
CSV value separator.
(The default is a comma.)
CSV value quote character.
(The default is a double quote.)
Lines starting with this character
are not marked as errors.
Empty lines are not marked
as errors.
CSV files with missing data
are not marked as errors.
Spaces, tabs, and line breaks
at the beginning of fields are
not marked as errors.
Spaces, tabs, and line breaks
at the end of fields are not
marked as errors.
Show this many errors at once.

Pro tips Master online csv tools

You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!

https://onlinetools.com/csv/validate-csv?input=street%2Cnumber%0AOak%20Street%2C723%0AMain%20Avenue%2C289%0AMaple%20Lane%2C567%0AElm%20Street%2C127%0APine%20Avenue%2C435%0ABirch%20Lane%2C651&input-delimiter=%252C&input-quote-char=%2522&allow-comments=false&comment-char=%2523&allow-empty-lines=false&allow-incomplete=false&allow-leading-spaces=false&allow-trailing-spaces=false&limit-errors=true&number-of-errors=10

All CSV Tools

Didn't find the tool you were looking for? Let us know what tool we are missing and we'll build it!
Quickly convert a CSV file to a JSON data structure.
Quickly convert a JSON data structure to a CSV file.
Quickly convert a CSV file to an XML file.
Quickly convert an XML file to a CSV file.
Quickly convert a CSV file to a YAML file.
Quickly convert a YAML file to a CSV file.
Quickly convert a CSV file to a TSV file.
Quickly convert a TSV file to a CSV file.
Quickly convert a CSV file to evenly aligned text columns.
Quickly convert text columns to a CSV file.
Quickly encode CSV to base64.
Quickly decode base64 to CSV.
Quickly convert CSV to URL-encoding.
Quickly decode CSV from URL-encoding.
Quickly change the CSV column delimiter to a new symbol.
Quickly prepend columns at the beginning of a CSV file.
Quickly append one or more new columns at the end of a CSV file.
Quickly insert one or more new columns anywhere in a CSV file.
Quickly export one or more columns from a CSV file.
Quickly replace any column in a CSV file with a new one.
Quickly delete one or more columns from a CSV file.
Quickly swap two columns in a CSV file.
Quickly exchange columns with rows in a CSV file.
Quickly exchange rows with columns in a CSV file.
Quickly transpose a CSV file.
Quickly truncate columns in a CSV file.
Quickly left-trim and right-trim column values in a CSV file.
Quickly sort data in one or more CSV columns.
Quickly remove double quotes from all CSV fields.
Quickly wrap all CSV fields in double quotes.
Quickly change the character that CSV fields are wrapped in.
Quickly make sure the given CSV file doesn't have errors.
Quickly find rows and columns in CSV that are missing values.
Quickly fill missing CSV values with placeholder values.

Coming Soon

These CSV tools are on the way!
Edit CSV in the Browser

Edit the contents of a CSV file in a neat editor.

Deduplicate CSV Data

Remove duplicate rows in a CSV file.

Analyze CSV

Display detailed information about a CSV file.

Convert CSV to HTML

Convert a CSV file to an HTML table.

Convert HTML to CSV

Convert an HTML table to a CSV file.

Convert CSV to Markdown

Convert a CSV file to a Markdown table.

Convert Markdown to CSV

Convert a Markdown table to a CSV file.

Convert CSV to ASCII Table

Draw an ASCII table from CSV data.

Convert CSV to ANSI Table

Draw an ANSI table from CSV data.

Convert CSV to Unicode Table

Draw a Unicode table from CSV data.

Convert CSV to PDF

Convert CSV to a PDF document.

Convert PDF to CSV

Extract data from a PDF and create a CSV file.

Convert CSV to a Screenshot

Create a screenshot of CSV data.

Convert CSV to an Image

Draw a CSV file as a PNG, JPG or GIF picture.

Convert Image to CSV

Extract data from an image and create a CSV file.

Convert CSV to Excel

Convert a CSV file to an Excel spreadsheet.

Convert Excel to CSV

Convert an Excel spreadsheet to a CSV file.

Convert CSV to vCard

Convert a CSV file to a vCard file.

Convert vCard to CSV

Convert a vCard file to a CSV file.

Convert CSV to LaTeX

Convert CSV to a LaTeX table.

Convert CSV to SQL

Generate SQL insert queries from a CSV file.

Convert SQL to CSV

Create a CSV file from SQL query results.

Convert CSV to qCSV

Convert a CSV file to a qCSV (quoted CSV) file.

Convert qCSV to CSV

Convert a qCSV (quoted CSV) file to a CSV file.

Convert CSV to INI

Convert a CSV file to an INI file.

Convert INI to CSV

Convert an INI file to a CSV file.

Convert CSV to JSONL

Convert a CSV file to a JSONL (JSON Lines) file.

Convert JSONL to CSV

Convert a JSONL (JSON Lines) file to a CSV file.

Convert CSV to TXT

Convert a CSV file to a plain text file.

Convert TXT to CSV

Convert a plain text file to a CSV file.

Convert CSV to 0SV

Convert a CSV file to a null-separated values file (0SV).

Convert 0SV to CSV

Convert a null-separated values file (0SV) to a CSV file.

Convert CSV to SSV

Convert a CSV file to a semicolon-separated file (SSV).

Convert SSV to CSV

Convert a semicolon-separated file (SSV) to a CSV file.

Convert CSV to HSV

Convert a CSV file to a hash-separated file (HSV).

Convert HSV to CSV

Convert a hash-separated file (HSV) to a CSV file.

Convert CSV to PSV

Convert a CSV file to a pipe-separated file (PSV).

Convert PSV to CSV

Convert a pipe-separated file (PSV) to a CSV file.

Convert CSV to SQLite

Create an SQLite database from the given CSV file.

Convert SQLite to CSV

Export tables from an SQLite database as CSV files.

Convert CSV to GeoJSON

Convert a CSV file to a GeoJSON file.

Convert GeoJSON to CSV

Convert a GeoJSON file to a CSV file.

Merge CSV Files

Merge together two or more CSV files.

Compare Two CSV Files

Visually show the differences between two CSV files.

Diff Two CSV Files

Run the diff algorithm on two CSV files.

Find Data in CSV

Find CSV cells that contain certain data.

Filter CSV Cells

Return data in a CSV file that matches a pattern.

Slice CSV

Extract a slice from a CSV file.

Cut CSV

Cut a fragment from a CSV file.

Rotate CSV Columns

Move CSV columns to the left or right.

Rotate CSV Rows

Move CSV data rows up or down.

Sort CSV Rows

Sort the data in one or more CSV rows.

Shuffle CSV Columns

Randomly change the positions of CSV columns.

Shuffle CSV Rows

Randomly change the order of CSV rows.

Shuffle CSV Values

Randomly change the order of all CSV values.

Rename CSV Columns

Change the name of CSV columns.

Create a Random CSV

Generate a random CSV of any size.

Create an Empty CSV File

Generate a CSV file that contains nothing.

Create a Large CSV File

Generate a large CSV file for testing.

Create a Custom CSV File

Generate a custom CSV file with m rows and n columns.

Delete Empty CSV Columns

Remove CSV columns that are completely empty.

Delete Empty CSV Rows

Remove CSV rows that are completely empty.

Delete Empty CSV Values

Remove all fields in a CSV file that are empty.

Delete Empty CSV Lines

Remove all empty lines in a CSV file.

Remove CSV Separator

Delete the comma separator from CSV files.

Remove Extra CSV Commas

Delete extra commas around CSV values.

Delete CSV Comments

Delete comments (lines starting with # or //) from CSV files.

Delete CSV Header

Delete the column header from a CSV file.

Delete First CSV Line

Delete the first line from a CSV file.

Compress a CSV File

Minify a CSV file and remove unnecessary whitespaces.

Optimize CSV File Size

Reduce the file size of a CSV file.

Change CSV Encoding

Change the character encoding of a CSV file to UTF8 or ISO-8859-1.

Add Extra Spaces in CSV

Add extra spaces between CSV columns.

Convert CSV to a Matrix

Convert a CSV file to an m-by-n matrix.

Convert CSV to an Array of Arrays

Convert a CSV file to an array of arrays of fields.

Convert an Array of Arrays to CSV

Convert an array of arrays of fields to a CSV file.

Convert CSV Columns to a List

Create a list from one or more CSV columns.

Convert CSV Rows to a List

Create a list from one or more CSV rows.

Convert CSV Columns to an Array

Create an array from one or more CSV columns.

Convert CSV Rows to an Array

Create an array from one or more CSV rows.

Find CSV Dimensions

Find the number of rows and columns of a CSV file.

Count CSV Columns

Find the number of columns in a CSV file.

Count CSV Rows

Find the number of rows in a CSV file.

Sum CSV Columns

Find the sum of CSV columns.

Sum CSV Rows

Find the sum of CSV rows.

Average CSV Columns

Find the average value of CSV columns.

Average CSV Rows

Find the average value of CSV rows.

Add Color to CSV

Use different colors for CSV data, quotes, and commas.

Animate a CSV File

Animate CSV data by showing column after column.

Fix a Broken CSV

Automatically fix a broken CSV.

Add Errors to CSV

Introduce random errors to a CSV file for fuzz testing.

Anonymize CSV Data

Hide personal or sensitive information in a CSV file.

Censor CSV Data

Mask data in a CSV file.

Hide a Message in a CSV

Hide a secret message in a CSV.

Encrypt CSV

Encrypt a CSV file and hide information in it.

Decrypt CSV

Decrypt a previously encrypted CSV file and make it readable.

Visualize CSV

Create a visual drawing that shows the CSV structure.

Create a CSV File

Create a new CSV file in the browser.

Unleash Zalgo on CSV

Distort a CSV file by infusing it with Zalgo characters.

Purge Zalgo from CSV

Neutralize the chaotic Zalgo and restore CSV integrity.

CSV Viewer

Preview the contents of a CSV file in an interactive editor.


Subscribe!

Subscribe to our updates. We'll let you know when we release new tools, features, and organize online workshops.

Enter your email here


Feedback. We'd love to hear from you! 👋



Didn't find the tool you were looking for? Let us know what tool we are missing and we'll build it!