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Open multiple ZIP archives locally, audit entry paths and expansion risk, selectively extract safe files, resolve collisions and export one evidence-backed result.

local batch archive workflow

Multi-ZIP Extraction & Safety Audit Studio

Open several ZIP files locally, inspect every entry before extraction, block unsafe paths, screen suspicious expansion ratios, select only what you need and export one collision-controlled ZIP or a browser-authorized folder.

local · selective · auditable

Drop multiple ZIP files hereArchive bytes stay in this browser tab. Password-protected or unsupported ZIP compression can fail before inventory.

Choose ZIP files Scan a folder for ZIPs

Archives0

File entries0

Input ZIP bytes0 B

Declared output0 B

Guard-blocked0

Selected output0 · 0 B

Choose or drop one or more ZIP archives.

1. Safety limits, layout & collision policy

Max expansion ratioMax one file (MB)Max selected output (MB)Output layoutCollision policySearch path / archiveExtensions filter

Absolute paths and parent traversal (../) are always blocked. Ratio and size guards are adjustable screening thresholds, not malware detection.

2. Review and select archive entries

Showing 0 matching entries

Use	Archive	Entry path	Uncompressed	Compressed	Ratio	Safety evidence	One file
Choose archives to build an inventory.

3. Extract selected entries

Direct folder save requires the File System Access API and explicit permission, typically on Chromium desktop. Combined ZIP works more broadly.

4. Evidence, manifest & repeat use

Choose archives to generate an audit.

Local numeric history

How to batch-extract without losing provenance

Inventory before inflating

ZIP central-directory metadata exposes entry names and declared compressed/uncompressed sizes. Use those numbers to review large or extreme-ratio entries before expanding them.

Path traversal is different from collision

../, absolute and drive-root paths can escape an intended extraction tree and are blocked. Two safe entries with the same target path are a separate collision problem handled by your chosen policy.

Source folders preserve provenance

The default output nests each archive beneath its own source-named folder. This makes same-path files from different archives unambiguous without relying on overwrite order.

Hashing proves content identity

Optional SHA-256 is computed only for selected, guard-safe entries and capped at 100 MB per run. Matching size alone is not a content identity check.

Nested ZIPs remain files

A ZIP stored inside another ZIP is flagged as a nested archive candidate but is not recursively opened automatically. That keeps resource use and trust boundaries explicit.

Archive extraction is not malware scanning

Path and expansion checks reduce common extraction hazards. They do not determine whether an extracted executable, document or script is trustworthy.

Truth boundary: This Studio handles ordinary ZIP archives through JSZip in your browser. It does not claim RAR/7z/TAR parity, password or AES-encrypted ZIP support, antivirus scanning, perfect zip-bomb detection, operating-system allocated-size accounting, automatic trust of extracted content, or ezyZip/native archive-suite format breadth. Browser memory, Web Crypto availability and filesystem APIs vary by device.

File handling notes

connects ZIP creation/extraction, archive inspection, GZIP, TAR/TAR.GZ extraction, ZIP merging, multi-ZIP extraction, splitting/joining, duplicate detection, renaming, folder summaries, file inventories, and file-type inspection without requiring a file upload where the browser APIs support the task.

Archive and safety boundaries

Browser memory can limit very large files. TAR extraction supports ordinary TAR/USTAR regular files and directories rather than every PAX/sparse/link edge case. Password-protected or uncommon ZIP compression methods can exceed JSZip support. Normalized download paths do not grant arbitrary filesystem write access.

Practical guide and verification

Keep each source archive identifiable

This workflow places extracted entries under a source-named folder in the combined output. That provenance prevents two different archives from silently replacing each other when they contain the same internal path.

Review entry counts before downloading

Compare the archive count and extracted-file count with what you expected. A surprisingly empty archive or a much larger entry count can be a useful signal to inspect the source before opening the combined result.

Browser memory is the practical batch limit

All archive bytes and generated output are handled locally, so a large collection can exceed available browser memory even when each individual ZIP is valid. Process smaller batches when memory pressure appears.

Path normalization is a safety boundary

Archive entry paths should not be allowed to escape the intended output structure. The combined package normalizes paths, but you should still treat archives from unknown sources cautiously when opening extracted files.

Extraction does not make the contents trustworthy

A ZIP can contain executable, script, document or other potentially unsafe files. Successful local extraction proves the archive could be decoded; it does not certify the extracted payloads as safe to run or open.