Open a ZIP to browse and pull out individual files, or create a new ZIP from your files — all in your browser, nothing uploaded.
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🔒 Reading and writing ZIPs happens entirely on your device — nothing is uploaded.
Don't extract the whole archive — open it, find the file you need, and download just that one.
Combine documents or images into a single ZIP for email or upload, without installing anything.
Tax docs, contracts, photos — opened and zipped locally, so confidential files never touch a server.
ZIP uses DEFLATE, which combines a sliding-window search for repeated byte sequences with Huffman coding that assigns shorter codes to more frequent symbols. Both mechanisms exploit redundancy, so the compression you get depends almost entirely on how repetitive the data is.
Text, source code, logs, CSV and XML compress extremely well — often to 20 or 30 percent of their original size, because natural language and structured markup are highly repetitive. Uncompressed images such as BMP, and raw audio such as WAV, also compress meaningfully.
Already-compressed data does not. JPEG, PNG, MP3, MP4 and PDF have had their redundancy removed by their own encoders, so zipping them typically saves one or two percent and occasionally produces a slightly larger file, because the archive adds its own headers. Zipping a folder of photographs to save space is effort spent for nothing — the useful reason to zip them is bundling many files into one, which is a separate benefit.
ZIP supports two encryption schemes and they are not comparable. The original ZipCrypto, from the late 1980s, is cryptographically broken: a known-plaintext attack recovers the key given a few hundred bytes of known content, and since archives frequently contain files with predictable headers, that condition is often met. Password recovery tools crack it in seconds regardless of password strength.
AES-256, supported by modern archivers, is sound, and with a strong password an AES-encrypted ZIP is genuinely protected. The problem is compatibility — some built-in extraction tools do not support it, so recipients may be unable to open the file.
In both cases, filenames and the directory structure remain readable without the password. A ZIP called redundancies-final.zip containing severance-letter-J-Smith.pdf discloses a great deal before anyone decrypts anything. If the names matter, nest the sensitive archive inside a second one.
Two attacks make handling untrusted archives risky. A zip bomb is a small archive that expands enormously — the classic example is 42 kilobytes expanding to petabytes through nested layers — exhausting disk or memory on whatever extracts it. Checking the reported uncompressed size before extracting is the basic defence.
Path traversal, sometimes called Zip Slip, exploits archives containing entries with paths like ../../etc/passwd. A naive extractor writes outside the target directory, potentially overwriting system files. Any code extracting untrusted archives must validate that each resolved path stays within the destination — this has produced vulnerabilities in a long list of widely used libraries.
More mundanely, ZIP's original filename encoding is ambiguous, so archives created on one system with non-ASCII filenames often extract with mangled names on another. Modern tools set a UTF-8 flag, but older ones do not, and there is no reliable way to detect the intended encoding afterwards.
When opening, the full path of each entry is shown so you know where files sit. When creating, files are added at the top level (folder upload support is on the list).
This tool handles ZIP only. RAR and 7z use different formats that browsers can't read natively — a desktop app like 7-Zip handles those.
No imposed limit — the only constraint is your device's available memory, since processing is local. For huge archives, extract individual files rather than all at once.
JPEG, PNG, MP4 and PDF are already compressed, so there is little redundancy left to exploit — expect one or two percent. Zip them to bundle many files into one, not to save space.
Only with AES-256. The legacy ZipCrypto scheme is broken and cracked in seconds regardless of password strength. Note that filenames stay readable without the password in both cases.