ZIP Compressor
Make a ZIP from any files, with already-compressed ones stored not deflated.
- Free
- No signup
- Nothing uploaded
- No watermark
Drop files or a folder here
any files or a whole folder, with its sub-folders · read on your device, never uploaded
How to Use the ZIP Compressor Online
ZIP Compressor packs any files into one ZIP and decides, per file, whether to deflate it or store it. A JPEG, MP4, MP3, PDF or DOCX is already compressed, and running deflate over it costs time and adds bytes, so those are stored untouched while text, spreadsheets and raw data are compressed at the level you set. The result shows the archive size, the saving, and how many files were stored.
Makes a ZIP with already-compressed files stored rather than deflated. That distinction saves real time and no space: attempting to deflate a JPEG costs CPU and typically makes the file slightly larger, which is why storing is correct for it.
No software to install Free Works on any device
Step-by-Step Guide to Using the ZIP Compressor
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1. Drop in as many files as you want to pack together
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2. Choose the compression level, then press the button
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3. Download the archive
It is built in your browser and never uploaded.
What is the ZIP Compressor?
Makes a ZIP with already-compressed files stored rather than deflated. That distinction saves real time and no space: attempting to deflate a JPEG costs CPU and typically makes the file slightly larger, which is why storing is correct for it.
At a glance
- Takes: Any mix of files, no count limit
- Levels: Four: Store, Fast, Normal or Maximum
- Stored automatically: Images, audio, video, PDFs, Office files and other archives
- Deflated: Everything else, at the level you chose
- Report: Archive size, percentage saved, and a note on stored files
- Runs: On your machine; nothing is uploaded
Why Use File and Archive Tools?
A ZIP from a colleague, a download with no extension or a folder full of badly named files can stop work for a while. These tools unpack, identify, hash and rename files inside your browser, so nothing is uploaded to find out what it is.
“Know what a file is before you open it.”
- Archives opened without software
- Downloads checked with hashes
- Duplicate files found
- Big files packed smaller
- Unknown files identified
- Files renamed in bulk
- Folders compared quickly
- Contents never leave your computer
Popular Uses for ZIP and File Tools
These tools help with the small file puzzles that come up every week.
- Opening RAR files See and extract what is inside an archive on a computer with no unzip program.
- Checking a download Compare a file’s SHA-256 checksum with the one on the download page.
- Mystery files Find the real type of a file that has lost its extension or has the wrong one.
- Renaming photos Rename a folder of camera photos with dates or numbers in one go.
- Clearing duplicates Find repeated files taking up space in a downloads or photos folder.
- Sending many files Pack several documents into one ZIP so they travel as a single attachment.
- Comparing folders See which files differ between a backup folder and the working copy.
- Reading file details Check a file’s size, dates and hidden metadata before sharing it.
What You Can Do with the ZIP Compressor
Understands ZIP structure rather than treating the file as bytes
Compression happens on your own machine, at your machine's speed
Reads the archive’s own directory, so a truncated or corrupt file is reported rather than half-extracted
Lists what is inside before anything is written to disk
Why Use ToolXkit for ZIP Compressor?
Your files stay with you
Everything runs inside your browser. Nothing you open or type is uploaded to a server.
Free, with no catch
No signup, no watermark and no daily limit on how often you use it.
Fast
Results appear in seconds, because nothing has to travel over the internet and back.
Works on any device
Use it on a computer, tablet or phone, in Chrome, Edge, Firefox or Safari.
Nothing to install
No app, no extension and no desktop program. Open the page and start.
Made for real people
Plain words and clear buttons, built by one developer who wanted tools like this to exist.
Archive Tools for Different Users
Office workers
Open ZIP attachments and bundle reports together without extra software.
Developers
Check signatures, MIME types and hashes, and create TAR or GZIP files.
IT support staff
Identify strange files and verify downloads before installing anything on a machine.
Photographers
Rename shoots in bulk and find duplicates before backing up a card.
Students
Unpack course material and zip up project folders for submission.
Security-minded users
Check what a file really is before trusting its name or icon.
Best Times to Unpack or Check a File
File tools are useful when you are:
- Opening an archive on a new computer
- Verifying a software download
- Stuck with a file that won’t open
- Tidying a messy downloads folder
- Emailing a folder of documents
- Checking a backup is complete
- Renaming lots of photos
- Freeing space on a full drive
Tips and Good to Know
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If everything you add is already compressed, the ZIP will be no smaller than the files. You get one convenient file, not a saving.
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Everything is read into memory to build the ZIP, so a folder of large videos is a poor fit. Bundle those with the zip built into your operating system.
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No encryption or password. Sensitive files need to be protected by another tool after zipping.
Frequently Asked Questions
Answers to common questions about this tool.
Do I need to install anything to use the ZIP Compressor?
No. ZIP Compressor runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.
Is it safe to use the ZIP Compressor online?
Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.
What is a checksum and why check one?
A checksum is a short code worked out from a file’s contents. If your copy gives the same code as the one the publisher lists, the file arrived complete and unchanged.
Is there a size limit in ZIP Compressor?
It depends on your device rather than on the site. Everything is processed in memory in the browser, so a computer handles bigger archives and folders than a phone does.
Is ZIP Compressor free to use at work?
Yes. It is free for personal and work use with no account. Because files stay on the machine, it also fits workplaces that do not allow uploading documents to outside sites.
Further reading
- List of file signatures (Wikipedia) The first few bytes that reveal a file’s real type, whatever its name says.
- ZIP file format (Wikipedia) How the ZIP format packs and compresses many files into one.
- RFC 1952: GZIP file format (IETF) The GZIP file format standard, published by the IETF.
More Files & Archives
Other free tools for the same kind of job.
- 7z Viewer List what is inside a 7z archive and extract it, in your browser. Open tool
- Archive Viewer Look inside a ZIP, TAR, GZ, RAR or 7z without extracting it. Open tool
- Bulk File Renamer Rename many files at once with find, replace, prefixes and numbering. Open tool
- Checksum Verifier Check a download against the checksum the publisher listed. Open tool
- Compress Files to ZIP Pack a folder of files into one ZIP, in your browser. Open tool
- Compress Text File Compress a .txt, .log, .csv or .json to GZIP, ZIP or raw deflate. Open tool
- Duplicate File Finder Find byte-identical files in a folder and see how much space they waste. Open tool
- File Extension Finder Look up what an extension means, what opens it, and whether it is risky. Open tool
- File Hash Generator Work out the MD5, SHA-1 and SHA-256 of a file without uploading it. Open tool