CSViewer · 1kApps

Drop your CSV or XLSX file here

Automatic delimiter, quotes, and header detection

CSViewer planilha.csv Spreadsheet tab

Header

First row is not column names 2-line header (use 2nd line as fields)

Cell / text size

Default (16px)

CSViewer

Product site More apps Remove ads

Selected

Filter active

Rows: 0 · Cell: — · Column: —

Column

Format column

Selected column

Choose formatting type:

Phone format: Your last choice is saved automatically for future uses.

Date format:

Type desired format:

How to format dates:

dd = 01..31 · d = 1..31
mm = 01..12 · m = 1..12
aaaa / yyyy = 2026 · aa / yy = 26
hh = 00..23 · mi = 00..59 · ss = 00..59

WhatsApp link settings

Important: to convert to WhatsApp links, values in this column must be phone numbers. The app removes parentheses, hyphens, and spaces automatically and creates direct https://wa.me/... links.

Country calling code (if missing in number):

Initial message text (optional):

Currency symbol / prefix:

Type custom prefix or symbol:

Decimal separator:

Thousands separator:

Decimal places:

Format preview: $ 1,234.56

Where to apply results?

Apply to the same column Replaces values directly in this column

Create new column beside it Keeps original column and adds a new column to the right

Open spreadsheet or paste data

Drag and drop your CSV or XLSX file here

Delimiter (comma, semicolon, tab), quotes, and header are detected automatically.

Paste copied data below (CSV, TSV, Excel, or table):

Filter spreadsheet

Type what you want to search:

Filter in:

Rename column

New column name:

Bulk edit

Applying to selected column

Action to perform:

Text to find:

Replace with:

Currency symbol / prefix:

Type custom prefix or symbol:

Decimal separator:

Thousands separator:

Decimal places:

Format preview: $ 1,234.56

Condition for action (auto-detects numbers and dates):

Condition value (e.g.: 100, 2026-03-15 or text):

Export or save data

1. What do you want to export/save?

Current view 0 Rows

Selected only 0 rows selected

2. Where to save?

Save as external file Download to your device

Save in the app Store in Saved Lists

Name to identify in Saved Lists:

3. File format:

CSV (.csv) Excel (.xlsx) HTML (.html)

Base file name:

4. Number of files:

Single file Download everything together

Split into multiple files Smaller chunks packed in a .zip

Split into multiple files

Batch settings for export

Maximum rows per file:

Column header names:

In all files Each part starts with the header row

Only in the first file Only file 001 will contain the header row

Files generated in ZIP: 1

Filename pattern: data-1-001.csv

0%

Saved lists in this browser

Select / deselect all

Format

	Date / Time	Name	Data (columns & sample)	Rows count	Action

No saved lists yet. Use File → Save to keep spreadsheets here.

No saved lists matched your search.

Spreadsheet settings

Column width when opening files:

Automatic size Calculates optimal width from column names and content

Fixed standard size All columns start with the width specified below

Default column width (in pixels):

Default cell / text size (6 to 35 px):

Insert multiple rows

Number of rows to insert above:

Confirm action

Are you sure you want to proceed?

About CSViewer

CSViewer (v1.0.0) — CSViewer is a fast viewer, editor, and splitter for CSV and XLSX files with an Excel-like spreadsheet interface.

Open customer lists, sales reports, or system exports, filter, standardize phone numbers, dates, WhatsApp links, and emails, remove duplicates, and split large files into smaller parts packaged in ZIP.

Total privacy: Total privacy: all processing runs locally inside your browser. No files or spreadsheet data are uploaded or stored online.

Official CSViewer page on 1kApps

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