ReduceZip

Compress a ZIP file

ZIP files can always be smaller

A standard ZIP just bundles files together — it doesn't necessarily compress everything inside it as aggressively as possible. ReduceZip opens your archive, re-compresses every image and video it finds, and repacks the whole thing. The result is the same ZIP, just smaller.

How it works

  1. 1

    Upload your ZIP

    Drop or select any ZIP file up to 1 GB. Your file is uploaded directly and securely — no third-party servers.

  2. 2

    Pick compression strength

    Choose how aggressively to compress. Low keeps near-original quality; High squeezes the most out of every file inside.

  3. 3

    We compress every file inside

    Images (JPEG, PNG, GIF) and videos are re-encoded at lower bitrates. Everything else is re-packed with maximum DEFLATE compression.

  4. 4

    Download the result

    Once done, you get a fresh ZIP ready to download. Files are automatically deleted from our servers after one hour.

Supported formats

ZIP archives
JPEG · PNG · GIF images
MP4 · MOV · AVI · MKV videos

FAQ

What types of files can I compress?
ReduceZip compresses ZIP archives. Inside the archive it re-encodes images (JPEG, PNG, GIF) and videos (MP4, MOV, AVI, MKV, WMV). All other file types are re-packed with maximum DEFLATE compression, which often shrinks them as well.
How much smaller will my ZIP get?
It depends entirely on what's inside. A ZIP full of high-resolution JPEG photos can shrink by 40–70 %. A ZIP of already-compressed files (PDFs, MP3s, existing ZIPs) may see little to no size reduction.
Is my file safe and private?
Your file is uploaded directly to a private cloud storage bucket over HTTPS. We never inspect the contents beyond what's needed to compress it. Files are automatically deleted after one hour.
What is the maximum file size?
The maximum upload size is 1 GB per file.
Is ReduceZip free?
Yes, completely free with no account required.
What does the compression strength setting do?
It controls the quality of the re-encoded images and videos inside the archive. Low strength means very little quality loss with a modest file-size reduction. High strength means a much smaller file at the cost of visible quality loss in images and videos.