.zip

File format · Released 1989 · By Phil Katz (PKWARE)

About ZIP Files

ZIP Archive

ZIP is the most widely used archive format, supported natively by Windows, macOS, and Linux. It combines file compression and bundling, making it the default choice for sharing multiple files as a single download.

Family

Archives & Compressed

Extension

.zip

MIME Type

application/zip

Can Use As

Input Output

● Hex Magic-Bytes Signature (Offset 0x00) Archives & Compressed Binary/Text Stream

5A 49 50 46 00 01 00 00 4B 41 49 4A ASCII: ZIPF....KAIJ

Convert ZIP → 7Z → 8+ CONVERSIONS ↓

WASM + ISO-27001 HYBRID ENGINE ⚡ 0ms Local Browser Mode

→

📏 Physical Size (CM / MM / Inch → 300 DPI Pixels)

Width ()

Height ()

Unit

Print Density (DPI)

Passport & ID Presets:

📈 Target Minimum File Size (Guaranteed ≥ KB)

Lossless JPEG Q100 + standard COM segment padding for government & exam portals

Tap to choose your file Drop files here or click to browse

Automatic format identification and lossless transcoding across 201+ formats.

Select Files

QUICK INGEST:

Max 25 MB · Free plan · No signup required

Convert to:

Detecting available formats...

Target Max File Size:

Optimize for:

Custom output filename (optional)

⚡ Instant In-Browser • 100% Private (0s)

Uploading...

→

Processing your file...

⚡ Need up to 1 GB or batch .ZIP with no subscription? 24h Pass (€4.99) or 7-Day Pass (€9.99) →

⚡ Converted locally in your browser (0ms upload)

READY!

🛡️ Verification Audit

✓
✓ sRGB Color Fidelity
✓

Continue with this converted file (0s zero re-upload):

⚡ Install Desktop App for 1-Click Conversions

Batch Conversion Ready!

⚡ Install Desktop App for 1-Click Conversions

Need to convert larger files or bigger batches right now?

Unlock up to 1 GB & priority cloud queue with 1-click Stripe checkout (Apple Pay, Google Pay, Card):

⚡ 24h Fast Pass · €4.99 (One-Time · up to 1 GB + Batch .ZIP) 🚀 7-Day Project Pass · €9.99 (One-Time · 7 Days Unlimited + Ad-Free) 🎟️ Only need this 1 single file today? Unlock Single-File Rescue Pass for €1.99 → View all plans (up to 2 GB) →

🕒 Recent Conversions (60m Session)

The story

HOW ZIP CAME TO BE.

ZIP was created by programmer Phil Katz in 1989 as the successor to the ARC archive format, whose author, SEA, had sued Katz for distributing his compatible "PKARC" implementation. Katz responded by designing a fundamentally better format — ZIP was both faster and compressed tighter — and released the specification publicly. It rapidly replaced ARC as the standard archive format on DOS, Windows, and eventually the world.

Thirty-five years later ZIP is embedded into every major operating system, shipped as the transport layer for Office documents (DOCX is a ZIP), eBooks (EPUB is a ZIP), and Java applications (JAR is a ZIP). The format's combination of simplicity, resilience, and first-day OS support has made it effectively immortal.

ISO / MIME SPECS

Technical Specifications

MIME type: application/zip
Compression: DEFLATE (most common), plus Bzip2, LZMA, XZ, Zstandard
Max entries: 65,535 (classic), ~2^64 (ZIP64)
Encryption: ZipCrypto (legacy, broken), AES-128/192/256
Variants: JAR, DOCX, EPUB, APK, ODT, WAR

Typical Sizes & Weights

Text document bundle

50–70% of originals

Photo album (already compressed)

~99% of originals

Source code repository

10–30% of originals

STRENGTHS & LIMITATIONS.

Strengths

Universal support — every OS, every decade, every decompression tool.
Fast random access via the Central Directory index.
Per-file compression — each entry can use a different codec.
Streamable and seekable.
Royalty-free with public specification.

Limitations

Default DEFLATE compression is weaker than modern alternatives (7z, zstd, xz).
Legacy ZipCrypto encryption is cryptographically broken.
Max 65,535 entries in a single ZIP (ZIP64 extension lifts this but breaks older tools).
No built-in error correction — a single bad byte can kill the Central Directory.

CURIOSITIES & TRIVIA.

DOCX, XLSX, PPTX, ODT, EPUB, JAR, APK and ODT are all ZIP archives — rename one to .zip and you can browse inside.

Phil Katz named the format "ZIP" because he wanted it to sound fast.

The Central Directory at the end of a ZIP file is an index — ZIP files are parsed back-to-front.

A ZIP can contain a ZIP that contains a ZIP — "zip bombs" are tiny files that unpack to petabytes.

ZIP supports password encryption but the legacy cipher (ZipCrypto) is trivially breakable; use AES-256.

STUDIO TOOLS FOR ZIP

Specialized Utilities for .ZIP Files

View all 45 tools →

archive →

Compress Files to ZIP

Compress multiple files and folders into a single ZIP archive. Reduce total size for faster transfers and organized storage.

compress →

Compress Image to 50KB

Compress JPG, PNG, or WebP photos to strictly under 50 KB (50,000 bytes) for passport portals, university admissions, civil service forms, and KYC uploads without changing pixel dimensions.

merge →

Merge PDF

Combine multiple PDF files into a single document. Drag and drop to reorder pages before merging. No software installation required.

compress →

Compress PDF

Reduce PDF file size without visible quality loss. Choose from low, medium, or high compression levels. Ideal for email attachments and web uploads.

CONVERT FROM ZIP

zip 7z zip tar zip gz zip bz2 zip xz zip lzma zip zst zip lz4

CONVERT TO ZIP

7z zip tar zip gz zip rar zip bz2 zip xz zip cab zip tgz zip jar zip war zip lzma zip zst zip lz4 zip cpio zip ar zip apk zip deb zip rpm zip lz zip iso zip dmg zip snap zip

Common Use Cases

File distribution, email attachments, software packages, backups.