CSV Import Doctor
Find and fix inconsistent columns, encoding problems, duplicate rows and invalid dates in a CSV before you import it. Free, private and instant.
How to use the CSV Import Doctor
- Choose your file using the file picker above. It stays on your device.
- Adjust any options that appear.
- Download the finished file.
About this tool
Upload or paste a CSV that is failing to import. The doctor detects the delimiter, reports encoding problems (including garbled characters such as é), rows with the wrong number of columns, empty rows, stray spaces, duplicates and dates in mixed or impossible formats, then produces a cleaned CSV with dates converted to YYYY-MM-DD. Rows it cannot repair safely are listed for you to review. Your files are read in your browser and never uploaded.
CSV Import Doctor is part of ToolStack Hub's Developer Tools. It runs entirely in your browser, which keeps your data private and makes results instant. There is nothing to install, no account to create and no usage limit.
Frequently asked questions
Why do accents look wrong, like é?
The file was saved as UTF-8 but opened as Windows-1252 (or the other way round). The doctor repairs common cases and the cleaned file is saved as UTF-8.
What counts as an impossible date?
A date that does not exist, such as 31/02/2025. These are listed for you to correct because guessing would risk wrong data.
Is the CSV Import Doctor free?
Yes. CSV Import Doctor is completely free with no sign-up, limits or watermarks.
Is my data private when I use the CSV Import Doctor?
Yes. It runs in your browser, so your input is not uploaded to our servers.
Does it work on mobile?
Yes. ToolStack Hub tools work on phones, tablets and desktop browsers.
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