Inspect any .zip file in the browser
Drop a ZIP to see its contents as a tree or flat table — sizes, compression ratio, modified times. Extract individual entries with one click. Everything happens locally.
Inspects entry list and sizes; supports per-file extract. Password-protected ZIPs not supported.
Drop a .zip to inspect
How to inspect a ZIP
JSZip reads the central directory and per-entry metadata without extracting unless you ask. The tool surfaces the sizes, ratios, and timestamps stored inside.
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Drop a .zip
Browser-only — files never leave your machine.
Inputs are treated as UTF-8 throughout the pipeline and validated client-side as you type — nothing dispatches until the value is well-formed.
inpututf-8client-sidevalidatedinput · text.zip · setarchive.zip
loaded · parsedclient-side - 02
Tree or flat
Tree shows hierarchy; flat lists every entry with size/date.
Each toggle re-computes through a memoised hook, so flipping options never resets your input and the UI stays snappy on large inputs.
viewoptionslivememoisedtogglesview · memoisedtree · livesrc/ index.ts
options set · memoisedlive - 03
Check compression
Header shows total files, unpacked size, packed size, ratio.
Randomness — where used — comes from
crypto.getRandomValues, neverMath.random. Heavy work sits inuseMemo.statscomputeinstantlocaldeterministicratio · instant42% · computedsaved 42.1%
computed · instantinstant - 04
Extract one entry
Click Extract on any file to download just that entry.
Copy writes through
navigator.clipboardand downloads use aBlob— zero network traffic. Same input plus same options always yield the same bytes.extractcopydownloadzero-networkreproducibleok · copiedready · copiedREADME.md
shipped · ready to shipsuccess
Pro tips for everyday utilities
Reach for crypto.getRandomValues
Cryptographically random for IDs, tokens, salts. Math.random is for animation and games, not security.
Mock data with seeds
Faker-style libraries can be seeded so tests are reproducible. Embed the seed in the fixture file.
Reference cards beat memory
Cheatsheets for Vim, Git, Docker, Linux signals are faster than man pages when you’re mid-flow.
Browser APIs vary
Touch events, gamepads, and clipboard differ across vendors. Feature-detect before use.
Persist in the right place
localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data.
When to inspect a ZIP
Asset audits, dependency sniffing, archive forensics.
Asset audit
What's actually inside the deploy bundle. Random values come from crypto.getRandomValues — cryptographically secure for tokens, salts, and session IDs. Math.random is deterministic enough for animations but predictable enough to be a security bug.
CSPRNG-backedPlugin sniff
Peek at a WordPress/Chrome plugin before installing. Pair with hashids, ULID, or UUID v7 when you need both random and sortable — useful for primary keys, public-facing IDs, and event log ordering without a sequence column.
reproducibleBackup verify
Confirm a backup contains the right structure. Output is deterministic given the same seed, so fixtures and tests stay reproducible across CI runs and contributor machines. Embed the seed in the fixture file for full replay.
snappySource archive
Browse a downloaded source tarball without extracting. Heavy work runs through useMemo so the UI stays snappy on large inputs. Same input + same options yields identical bytes — the kind of stability snapshot tests rely on.
feature-detectedCompression study
Compare ratios across compression options. Storage tools persist to the right backend: localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data. Pick the right shelf and quota worries disappear.
deterministicDRM/EPUB inspection
ZIP-based formats like EPUB or DOCX reveal their parts. Browser feature detection: clipboard, fullscreen, gamepad, and Web Bluetooth APIs gracefully fall back when unavailable. No surprise white screens on Safari or older Firefox.
production-readyFrequently asked questions
Something missing?
Tell us what you need. We ship the top requests every two weeks.