Added
Records that exist only in the second file.
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Tool Story
Compare Fixer
Find out what changed between two files without doing the side-by-side spreadsheet squint.
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Compare two files — free →The problem
You have yesterday’s file and today’s file. Or the list before the meeting and the list after it. You know something changed. Finding it means filters, formulas, tabs, and a lot of hoping you matched the right rows.
The difficult part is not opening two spreadsheets. It is deciding what makes two rows the same record, then checking every other detail without losing duplicates or blank IDs along the way.
How to think about this problem
A comparison is only trustworthy when the matching rule is trustworthy.
Two files can look similar and still use different row orders, different columns, or duplicate IDs. Compare Fixer makes you choose what identifies the same record before it tells you what changed. If the files cannot support a clean comparison, it says so instead of quietly guessing.
What it does
Add two CSV files, Excel sheets, or pasted lists. Choose how records match and which details matter. Review what was added, removed, changed, unchanged, or duplicated, then download the results you need.
What comes back
Removed
Records that exist only in the first file.
Changed
The same record with different details, shown field by field.
Unchanged
Records that match exactly under the options you chose.
Duplicates
Repeated or blank matching values that could make the comparison misleading.
Exports
A full CSV or a focused download for the group you need.
On privacy and trust
Your files stay in your browser.
File reading, comparison, and CSV generation all happen locally in the browser. No file data is sent to a server. No AI API. Nothing from your files is stored anywhere.
Under the hood
Browser-side Next.js with SheetJS for CSV and Excel parsing. The comparison engine is deterministic and runs locally. No backend route is involved in the comparison.
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Compare two files — free →Frequently asked questions
What can Compare Fixer compare?
CSV files, Excel workbooks, and pasted lists with one item per line. For Excel workbooks, you can choose the sheet and header row before comparing.
Does Compare Fixer upload or store my files?
No. Your files are read and compared inside your browser. Nothing is uploaded, sent to an API, or stored by this site.
How does it know which rows are the same record?
You choose what to match on, such as an ID, email address, domain, or a combination of columns. Compare Fixer does not silently make that decision for you.
What can I download?
You can download the full comparison or separate CSV files for added, removed, changed, and duplicate records.
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