How do I compress a ZIP file?

Drop the ZIP onto the compressor above, and click Compress. Download the smaller ZIP when it's done; it usually takes a few seconds.

Does compressing ZIP reduce quality?

No. ZIP compression is lossless. It repacks every file at maximum compression; the contents are byte-identical.

How much smaller will my ZIP get?

Anywhere from almost nothing to a lot. ZIPs of text, code or uncompressed files made with fast settings shrink noticeably; ZIPs of photos, videos or other archives barely change.

Can I compress ZIP to a specific size?

No. Because ZIP compression is lossless, the result depends on the content and can't be dialled to an exact number. If you need a much smaller file, converting ZIP to 7Z gets further.

Is it safe to compress ZIP files here?

Yes. Your file travels over an encrypted connection to an isolated sandbox created for your job only, and both the original and the result are deleted automatically.

Is the ZIP compressor free?

Yes. Cloud jobs like this one use the same free daily credits as cloud conversions, and there's no watermark.

Should I convert my ZIP instead?

Sometimes. If the recipient can open 7z, it usually gets smaller still. The ZIP to 7Z converter does that in one step.

ZIP→smaller ZIP→7Z JPG→smaller ZIP→TAR.GZ PNG→smaller ZIP→TAR MP4→smaller ZIP→TAR.BZ2 MP3→smaller ZIP→TAR.XZ PDF→smaller PNG→JPG WebP→smaller JPG→PNG HEIC→smaller PNG→WebP DOCX→smaller JPG→WebP GIF→smaller WebP→PNG SVG→smaller WebP→JPG MOV→smaller HEIC→PNG AVIF→smaller HEIC→JPG MP4→MP3 M4A→smaller PNG→JPEG JPG→JPEG WebM→smaller JPEG→PNG JPEG→JPG MKV→smaller PNG→PDF JPG→PDF XLSX→smaller PDF→PNG PDF→JPG EPUB→smaller HEIC→WebP MP4→WebP AVI→smaller PDF→DOCX DOCX→PDF FLAC→smaller JPEG→WebP WebP→JPEG PPTX→smaller PNG→GIF JPG→GIF AAC→smaller GIF→PNG GIF→JPG TIFF→smaller MP4→MOV MOV→MP4 OGG→smaller WebP→PDF HEIC→JPEG Opus→smaller WebP→GIF GIF→WebP 7Z→smaller HEIC→PDF MP3→WAV ODT→smaller WAV→MP3 JPEG→PDF TAR.GZ→smaller PDF→JPEG SVG→PNG ODS→smaller SVG→JPG HEIC→GIF ODP→smaller MOV→MP3 MP4→GIF TAR.BZ2→smaller GIF→MP4 JPEG→GIF TAR.XZ→smaller GIF→JPEG PNG→AVIF JPG→AVIF AVIF→PNG AVIF→JPG MP3→M4A M4A→MP3 GIF→PDF SVG→PDF PNG→SVG JPG→SVG PDF→SVG SVG→WebP MOV→WebP MP4→WAV MP4→WebM WebM→MP4 WebP→AVIF AVIF→WebP WebP→SVG SVG→JPEG MP4→MKV MKV→MP4 HEIC→AVIF MP4→M4A JPEG→AVIF AVIF→JPEG JPEG→SVG MOV→GIF GIF→MOV WebM→MP3 AVIF→PDF MP3→FLAC FLAC→MP3 MP4→AVI AVI→MP4 MKV→MP3 GIF→AVIF AVIF→GIF SVG→GIF GIF→SVG WebM→WebP MOV→WAV XLSX→PDF CSV→PDF EPUB→PDF PDF→EPUB MOV→WebM WebM→MOV MKV→WebP PNG→ICO JPG→ICO ICO→PNG ICO→JPG MP3→AAC WAV→M4A AAC→MP3 M4A→WAV MP4→FLAC AVI→MP3 MOV→MKV MKV→MOV MOV→M4A DOCX→EPUB EPUB→DOCX CSV→DOCX PDF→TXT DOC→PDF TXT→PDF WebP→ICO ICO→WebP PPTX→PDF AVI→WebP WebM→GIF GIF→WebM SVG→AVIF MOV→AVI AVI→MOV

Compress ZIP

Make ZIP files smaller without changing a single byte of what's inside. Free, processed in an isolated sandbox and deleted automatically.

Isolated cloud sandbox, auto-deleted
Lossless: identical contents
Batch & ZIP download

How to compress ZIP

1
Add your ZIP files
Drag and drop ZIP files onto the compressor, paste them, or click to browse. You can add several at once.
2
Keep the default
ZIP compression is lossless, so there's nothing to tune: every file comes back with identical contents.
3
Compress
Click Compress. Files are processed in an isolated cloud sandbox and are usually ready in seconds.
4
Download
Download each smaller ZIP, or everything at once as a ZIP.

What compression does to ZIP

LosslessCloud sandbox

Repacks every file at maximum compression; the contents are byte-identical.

It's lossless, so there are no quality levels to choose between: every file comes back with identical contents, just packed more tightly.

Need it much smaller? If the recipient can open 7z, it usually gets smaller still. Convert ZIP to 7Z

Why there are no target sizes

Lossless compression never throws anything away, so how small a ZIP can get depends entirely on what's in it. There's no quality dial to turn until the file hits 1 MB or 100 KB, which is why ZIP has no target-size pages.

If you need a specific size, convert to a lossy format first, for example ZIP to 7Z.

ZIP · ZIP Archive

ZIP is the most widely supported archive format, bundling and compressing files so they open natively on Windows, macOS and Linux.

Type: Archive
Extension: .zip
MIME: application/zip
Best for: sending multiple files as one download

Open standard

All ZIP conversions →

Compress other archives

All archives →

Compressing ZIP: frequently asked questions

Free, private and in your browser

Smaller ZIP files, in seconds.

No sign-up, no watermark. Files are processed in an isolated sandbox and deleted automatically.

Compress a file All compress tools

Most conversions never leave your device
Cloud files deleted automatically
No watermarks