Repair ZIP
Fix corrupt or damaged ZIP files in your browser. Recovers files from ZIPs with CRC errors, truncated archives, or partial downloads — no upload needed.
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How it works
Upload
Drag and drop your ZIP file — or click to browse.
Process
Your browser handles everything locally. Zero server contact.
Download
Instantly save the result. No watermarks, no limits.
Why use Repair ZIP?
Privacy First
Your files never leave your device. No server contact, ever.
100% Browser-Based
Everything runs locally using JavaScript — works offline too.
Instant Results
No queue, no waiting. Files are processed in seconds.
Completely Free
No account, no plan, no watermarks. Free, always.
Step-by-step guide
Select your file
Click the upload area or drag a ZIP file from your desktop into the tool above.
Process in your browser
The tool processes your file entirely inside your browser using JavaScript. Nothing is sent to a server.
Download ZIP
Once done, your file downloads instantly. No sign-up, no waiting, no watermarks.
How to Repair a Corrupt ZIP File
A corrupt ZIP file usually shows errors like "CRC failed", "cannot open file", "unexpected end of archive", or "bad local file header". These happen when:
- The download was interrupted or the file is partially downloaded
- The ZIP was stored on a failing hard drive or USB stick
- The file was transferred incorrectly (missing bytes)
- The central directory at the end of the ZIP was truncated
What This Tool Does
The Repair ZIP tool reads your ZIP archive entry-by-entry, bypassing CRC verification. For each file inside the archive, it attempts to extract the raw data. Files that decode successfully are saved into a clean, repaired ZIP. Files that are too damaged to recover are skipped (and you'll be told how many were recovered vs. skipped).
What "CRC Error" Means
CRC (Cyclic Redundancy Check) is a checksum that ZIP uses to detect data corruption. When a CRC error occurs, it means the stored checksum doesn't match the actual data — the file inside the ZIP has been corrupted. Sometimes the file data is still intact and only the checksum header is wrong; in that case, this tool can still recover it.
Limitations
- Password-protected ZIPs cannot be repaired here.
- If the file data itself is corrupted (not just the headers), the extracted file may be unusable even after recovery.
- Some ZIP formats (ZIP64, split archives) may not fully parse in the browser.
Frequently asked questions
The most common causes are incomplete downloads (the transfer was cut off mid-way), damaged storage media (bad sectors on a hard drive or USB stick), file system errors, and interrupted writes (e.g. the computer lost power while the archive was being created).
Partial recovery is often possible even from heavily damaged archives. The tool scans the binary data for ZIP local file headers and central directory signatures, reconstructing a valid archive from whatever data is intact. Entries whose compressed data was fully written can usually be recovered even if the archive's central directory is missing.
This error means the file is truncated — the download or transfer was interrupted before the archive was complete. The central directory (written at the very end of a ZIP file) is missing or incomplete. Repair can recover entries whose data was already written before the interruption.
Multi-part archives need all parts assembled before repair. If you are missing a part, the missing entries cannot be recovered. Combine all parts first by renaming them correctly and running the tool on the final part (.zip), then attempt repair.
This means the archive's central directory is intact but one or more entries have corrupt compressed data. The extractable files were not damaged; the failing entries had their compressed content corrupted during storage or transfer. Our tool attempts to recover the damaged entries by trying alternative decompression methods.
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