Create and check a ZIP archive
Group files in a copy, create the archive and extract it elsewhere to verify the result.
Follow the method ↓
The answer in 30 seconds
ZIP is useful for bundling several files and can reduce size for some content. It is not automatically encrypted, and already compressed images or videos may shrink very little.
Prepare the files, create a ZIP with your device's archive function, compare its contents with the originals and extract a test copy into another folder before sending it.
Examples to adapt
Check that subfolders and the latest versions are included.
Confirm the recipient accepts ZIP and that the size is within its limit.
Use an appropriate encryption method rather than treating ordinary compression as protection.
Check an extraction
Compare two file lists
Paste one name or relative path per line. Use the same root and path separators in both lists. Case, accents and extensions remain distinct; only leading and trailing whitespace is removed.
Processed within this page, with no transmission or saving of lists by this tool. Matching names do not prove matching contents. Without paths, files in different folders can look like duplicates.
Follow the method
- 1Prepare originals
Collect the right versions in a temporary folder without deleting the originals.
- 2Create the archive
Use the operating system's ZIP action and give the result a clear name.
- 3Inspect the list
Open the archive and compare filenames, folders and total item count.
- 4Extract a test
Unzip to a separate location and open representative files.
A closer look
Check what actually came out of the archive
Fictional case: an archive should deliver three documents. Successfully creating it does not establish that the recipient can use every file.
| Check | Observation in this example | Next action |
|---|---|---|
| Expected list | notes.txt, images/photo.jpg, annexe.pdf | Record paths from the same root folder. |
| Extraction | Only notes.txt and images/photo.jpg appear. | Look for annexe.pdf before calling the folder complete. |
| Opening | photo.jpg exists but will not open. | Check the source and make a fresh working copy. |
| Size | The archive is nearly as large as the photos. | This alone is not a failure: savings depend on file content. |
Extract into a separate folder to distinguish sources from results. The comparator below detects differences between lists; it does not read files.
Do matching lists prove that file contents match?
No. Different files can have identical names. Also check that they open and, when exact integrity matters, compare hashes using a suitable tool.
Supporting documentation : Microsoft · Zip and unzip files · Consulted on 2026-10-29. Examples and calculations are illustrative.
A checklist to keep
Use these checks to record what you found. The grid supports a decision; it does not make one for you.
| Check | What to examine | Action |
|---|---|---|
| Originals | Are the correct versions selected? | Prepare |
| Archive | Are folders and files present? | Inspect |
| Size | Does it meet the destination limit? | Check |
| Extract | Do files open elsewhere? | Test |
| Privacy | Is protection required? | Decide |
Read the checklist directly in the table.
What to check
ZIP compression does not itself hide file contents.
Some formats are already compressed and may not become much smaller.
A successful archive creation does not prove every file is usable.
Common questions
Will ZIP always make a file smaller?
No. The result depends on the original file formats and content.
Can I rename a file .zip to compress it?
No. Use an archive tool to create a real ZIP file.
Sources and documentation
Documentation consulted on . Examples are illustrative; interfaces and results may change.