Question 1

What file formats do you support?

Accepted Answer

We support Apple Numbers (.numbers), Microsoft Excel (.xlsx, .xls), and CSV files. For comparison, you can upload Numbers and Excel files. For conversion, you can upload CSV files to convert to Parquet format.

Question 2

Is the service really free?

Accepted Answer

Yes, our file comparison and conversion tools are completely free to use. There are no hidden fees, registration requirements, or usage limits.

Question 3

Do I need to create an account?

Accepted Answer

No account creation is required. You can start using our tools immediately without any registration or sign-up process.

Question 4

Are my files uploaded to your servers?

Accepted Answer

No, your files are never uploaded to our servers. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, ensuring complete privacy and security.

Question 5

Can you see my file contents?

Accepted Answer

Absolutely not. Since all processing happens in your browser, we have no access to your files or their contents. Your data remains completely private.

Question 6

What happens to my files after processing?

Accepted Answer

Since files are processed locally in your browser, they are automatically cleared from memory when you close the browser tab or navigate away from the page. No traces are left on our servers.

Question 7

How accurate is the Numbers vs Excel comparison?

Accepted Answer

Our comparison tool analyzes files cell-by-cell and provides highly accurate difference detection. It handles different data types including text, numbers, dates, and formulas, normalizing values for proper comparison.

Question 8

Why are there differences when files look the same?

Accepted Answer

Files may appear identical but have subtle differences in formatting, precision of numbers, or hidden characters. Our tool detects these micro-differences that might not be visible in the applications themselves.

Question 9

Can I compare large spreadsheets?

Accepted Answer

Yes, but performance depends on your browser and device capabilities. For optimal performance, we limit the preview display to the first 50 rows and 25 columns, though the full comparison is still performed.

Question 10

What if my Numbers file won't parse?

Accepted Answer

Numbers files are complex archives. If parsing fails, try opening the file in Numbers and re-saving it, or export it to Excel format first. Some very old or corrupted Numbers files may not be supported.

Question 11

What is Parquet format and why should I use it?

Accepted Answer

Parquet is a columnar storage format optimized for analytics. It provides better compression ratios (often 50-90% smaller files), faster query performance, and built-in schema information compared to CSV files.

Question 12

How much compression can I expect?

Accepted Answer

Compression ratios vary based on your data, but typically range from 2x to 10x smaller than the original CSV. Files with repetitive data or many empty cells see the best compression.

Question 13

Will the Parquet file work with my analytics tools?

Accepted Answer

Parquet is widely supported by modern analytics tools including Apache Spark, Pandas, Tableau, Power BI, BigQuery, Snowflake, and many others.

Question 14

Can I convert large CSV files?

Accepted Answer

File size limits depend on your browser's available memory. Most browsers can handle CSV files up to several hundred megabytes. For very large files, consider using server-based conversion tools.

Question 15

How does the JSON diff tool work?

Accepted Answer

Our JSON diff tool performs intelligent structure-based comparison, not just text comparison. It understands JSON semantics, compares objects by their actual structure, and highlights additions, deletions, and modifications at the field level.

Question 16

Can it handle large JSON files?

Accepted Answer

Yes! For files larger than 5MB, the tool automatically uses Web Workers to prevent browser freezing. This allows processing of large JSON files without blocking the user interface, ensuring smooth performance even with complex data structures.

Question 17

What makes this different from text-based diff tools?

Accepted Answer

Unlike simple text comparison, our tool understands JSON structure. It can handle differences in formatting, key order, and whitespace without showing false positives. It focuses on actual data differences rather than presentation differences.

Question 18

Can I copy only the changes?

Accepted Answer

Absolutely! The tool provides multiple output formats: a summary of changes only, a patch format for applying changes, and a structured view. You can copy just the differences rather than the entire JSON, making it perfect for code reviews and debugging.

Question 19

What comparison options are available?

Accepted Answer

You can configure the comparison to ignore array order, case sensitivity, and treat null as undefined. These options help you focus on meaningful differences while ignoring formatting or structural variations that don't affect your data.

Question 20

Is my JSON data safe?

Accepted Answer

Yes, completely safe. Like our other tools, all JSON processing happens entirely in your browser. Your JSON data never leaves your device, ensuring maximum privacy and security for sensitive configuration files or API responses.

Question 21

How does the Image Diff work?

Accepted Answer

It compares images at pixel level with optional perceptual Lab ΔE threshold, supports overlay/slider/heatmap views, and offers 'Changes Only' mode to highlight only modified regions.

Question 22

Can it handle slight misalignment?

Accepted Answer

Yes. Use Auto Align to estimate translation offset, and Auto Align R/S to roughly fit rotation and scale. You can also fine-tune with offset/rotation/scale sliders.

Question 23

Is everything processed locally?

Accepted Answer

Yes. All computations run in your browser. A Web Worker option accelerates heavy processing without uploading any data.

Question 24

Can I analyze multiple images at once?

Accepted Answer

You can batch load images, cluster near-duplicates with aHash, pick a baseline, and quickly open pairwise comparisons.

Question 25

How do I export only the changes?

Accepted Answer

Use 'Download Mask' to export a transparent PNG containing changed pixels only, or 'Export Changes (ZIP)' in batch mode to download multiple masks.

Question 26

Which browsers are supported?

Accepted Answer

Our tools work on all modern browsers including Chrome, Firefox, Safari, and Edge. WebAssembly support is required for Parquet conversion functionality.

Question 27

Why is the conversion taking a long time?

Accepted Answer

Large files or complex data structures can take time to process. The conversion happens entirely in your browser, so performance depends on your device's CPU and available memory.

Question 28

I'm getting an error during file processing. What should I do?

Accepted Answer

Try refreshing the page and uploading the file again. If the error persists, the file might be corrupted or in an unsupported format variant. Check that your file opens normally in its native application.

Question 29

Can I use these tools offline?

Accepted Answer

Once the page is loaded, basic functionality works offline since all processing happens in your browser. However, you need an internet connection for the initial page load.

Frequently Asked Questions

Still have questions?