Optimize CSV File Size

Optimize CSV File Size by trimming fields, removing empty values, and deleting duplicate rows. Clean up CSVs fast with live preview and export support.

Paste your input above or import a file below.
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Supported file types: .csv, .txt, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm
Total characters: 0
Options
Trim fields
Remove empty fields
Remove duplicate rows
Maximize output

How to Use:

  • Paste your CSV content into the CSV Input box or upload a file using Choose File. Accepted formats include .csv, .txt, .tsv, and other plain text types.
  • Enable Trim fields to remove extra spaces around each value.
  • Toggle Remove empty fields to delete any blank cells from each row.
  • Use Remove duplicate rows to keep only the first occurrence of each unique line.
  • Enable Maximize output if you want to expand the output area for better visibility.
  • The Optimized CSV Output updates live and flashes on changes.
  • Click Copy Output to copy the result or Export to File to save it as a .csv.
  • A live Total characters count appears below the output.
  • Press Clear All to reset the input, toggles, file upload, and preview.

What Optimize CSV File Size can do:

Optimize CSV File Size helps you reduce the size of CSV data by automatically removing unnecessary characters. This includes trimming whitespace, eliminating blank cells, and deduplicating rows. It’s ideal for cleaning up bloated or messy exports, preparing CSVs for upload, or minimizing file size for storage or transport. Everything happens in your browser, instantly.

Example:

Input:

Name, Age , City , Notes  
Alice,30,New York,  
Bob,27,London,  
Bob,27,London,  
Charlie, ,Sydney,Test

Output (Trim + Remove Empty + Deduplicate):

Name,Age,City,Notes  
Alice,30,New York  
Bob,27,London  
Charlie,Sydney,Test

Common Use Cases:

Use this tool to optimize CSVs before uploading them to a system that rejects blank fields or duplicates. It’s especially useful for trimming down exports, reports, or scraped data. Whether you’re a dev, analyst, or admin, this tool helps streamline and shrink CSVs without opening a spreadsheet.

Useful Tools & Suggestions:

Before shrinking your file, run Analyze CSV to see where all the bloat is actually coming from. Then after optimizing, use Compress a CSV File if you still need to crunch it down even further for sharing or storage.

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