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CSV File Comparison

Compare two CSV tables using a unique key column; report added, removed and changed rows.

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A useful toolkit for text, data, images and calculations.

  1. 01

    Add your input

    Choose a tool, enter values or select a file.

  2. 02

    Make it yours

    Adjust the options and run the action.

  3. 03

    Take the result

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Compare two CSV tables online

Compare two keyed CSV exports without confusing column order. Keys must identify records as required by the tool; review case, empty keys and repeated-key errors.

How to use it

Enter Original CSV or select Try example. Provide Updated CSV in the second editor. Review Key column. Select Run tool and inspect the result before copying or downloading.

Options and example settings

OptionChoices / valueExample default
Key columnEnter a valueid

Worked examples

Reconcile two exports by an ID column. Row order and column order can differ; exact cell values are compared under matching header names.

An amount changed and an ID disappeared

Settings: Key column: id

Input:

Original:
id,amount
001,10.00
002,20.00

Updated:
id,amount
001,12.00
003,20.00

ID 001 changes amount from 10.00 to 12.00; 002 is removed; 003 is added.

Same data with reordered columns

Settings: Key column: id

Input:

Original:
id,name
1,Anna

Updated:
name,id
Anna,1

No differences. Matching uses the key and header names rather than column positions.

Choose the right tool

Use this for key-based record differences. Compare Text checks literal text lines, while Join CSV Tables combines corresponding rows.

Limitations and common mistakes

  • Use a non-empty, unique key in both files. Repeated keys cannot identify one row reliably.
  • Paste comma-separated tables with unique headers; quote cells containing commas or line breaks.
  • 10 and 10.00 are different strings here. This comparison does not normalize currencies, dates or decimal formats.
  • Keys must identify records as required by the tool; review case, empty keys and repeated-key errors.

Frequently asked questions

How can I compare two CSV tables online?

Enter Original CSV or select Try example. Provide Updated CSV in the second editor. Review Key column. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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