ZIP File Inspector

How to use

1. 1Drop a .zip, .jar, .epub, .docx, .xlsx, .pptx, .apk, or .ipa onto the upload area or click Choose file. Up to 500 MB is supported.
2. 2Read the archive overview at the top for entry counts, uncompressed and compressed totals, compression ratio, ZIP64 status, encrypted entry count, and the compression methods used.
3. 3Scroll the entries table to inspect every file and folder. Each row shows uncompressed size, compressed size, ratio, method, modified timestamp, CRC32, and flags (DIR, ENC, UTF-8, ZIP64).
4. 4Filter by filename to find specific paths inside a deep archive, or click a sort button to order entries by name, largest, smallest, or best compression.
5. 5Use Copy summary to grab the overview or Copy as TSV to paste the entry list into a spreadsheet. Click Clear to load a different archive.

About this tool

ZIP File Inspector reads a ZIP archive in your browser and lists every entry inside without extracting a single byte of compressed data. Drop in a .zip, .jar, .war, .epub, .docx, .xlsx, .pptx, .apk, or .ipa file and the inspector walks the archive's Central Directory and displays each entry with its filename, original size, compressed size, compression ratio, compression method (Stored, Deflate, Deflate64, BZIP2, LZMA, Zstandard, and the other PKWARE method codes), modified date and time, CRC32 checksum, and a row of flags showing whether the entry is a folder, encrypted, stored with UTF-8 filenames, or recorded in ZIP64 64-bit fields. Above the entry table the tool surfaces archive-level totals: how many files and folders, total uncompressed and compressed bytes, the overall compression ratio with bytes saved, whether ZIP64 was used (signals an archive larger than 4 GiB or with more than 65535 entries), how many entries are password-protected, the distribution of compression methods used across the archive, and the optional archive comment most ZIP utilities never let you see. Filter the entry list by filename to find a specific path inside a deeply nested archive, sort by archive order, name, largest, smallest, or best compression to spot bloat in a build artifact, and copy a tab-separated entry list straight to your clipboard for spreadsheets, code reviews, and bug reports. Parsing follows the PKWARE APPNOTE 6.3 specification: the End of Central Directory record is found by scanning the tail of the file for the PK\x05\x06 signature, the Central Directory is walked entry by entry from PK\x01\x02 records, the MS-DOS packed date and time are decoded into a real ISO 8601 timestamp, filenames are decoded as UTF-8 when the bit-11 flag is set and as IBM Code Page 437 otherwise, and ZIP64 extended information fields (id 0x0001) override 0xFFFFFFFF placeholders so multi-gigabyte archives report accurate sizes. The entire scan runs on a Uint8Array view of the file in your tab, which means the archive, its file list, and any sensitive paths inside it never leave your device.

Free to use. Works in your browser. No signup, no login.