PDF PremSmart CSV Cleaner Online Free – Remove Duplicates & Fix CSV
Messy CSV? Upload it or paste it, pick what to fix, and download a clean file in seconds. Duplicate rows, empty rows and columns, and stray spaces are removed automatically — right in your browser, no sign-up.
Drag & drop your CSV here or browse files
CSV files only — or paste data below
No file selected.
How to use this tool
- Upload a CSV file or paste your CSV data into the box.
- Tick the fixes you want — duplicates, empty rows, empty columns, extra spaces.
- Click Clean CSV, check the preview, then download the cleaned file.
Frequently asked questions
How do I clean a CSV file online for free?
Upload your CSV (or paste it), tick the fixes you want, and click Clean CSV. Duplicates, empty rows and columns, and extra spaces are removed, and you download the cleaned file instantly. No sign-up, no watermark.
Is my CSV data uploaded to a server?
No. Cleaning happens entirely inside your browser — your data never leaves your device.
What counts as a duplicate row?
Two rows with exactly the same values in every column (after trimming spaces, if that option is on). The first copy is kept and later copies are removed.
Will the tool change my numbers or dates?
No. It only trims spaces, drops duplicate or fully-empty rows and columns, and keeps every other value exactly as it was.
Does it handle quoted fields and commas inside values?
Yes. The parser understands quoted fields, commas inside quotes, and line breaks inside quoted values, so your data stays intact.
Can I convert the cleaned CSV to Excel?
Yes — after cleaning, use our free CSV to XLS Converter to turn the cleaned file into a genuine Excel (.xls) spreadsheet.