File Compressor (ZIP)
Compress files into a ZIP in your browser, with a size-saving report. Your work stays on this device whenever possible.
How to use File Compressor (ZIP)
- Choose one or more files in the file picker.
- Pick a Compression level: Maximum, Balanced, Fastest or Store only.
- Change the archive file name if you like.
- Press "Compress"; the archive downloads and a table shows the space saved.
Worked example
Select a 2.4MB CSV export and a 180KB report with Balanced compression. The table shows an original total of about 2.6MB and an output archive of about 0.5MB, roughly 80 percent saved, mostly from the CSV; the report was already compressed.
When to use this tool
- Sending many documents in a single email attachment.
- Shrinking large text exports or logs before uploading them.
Important limitations
Already-compressed files (JPG, PNG, MP3, MP4, ZIP) barely shrink; the tool bundles them but cannot make them much smaller.
Frequently asked questions
Which files get much smaller?
Text, CSV, JSON, code, Word and Excel documents, and uncompressed images such as BMP compress well, often by 50 to 90 percent. JPG, PNG, MP3, MP4 and existing archives are already compressed and barely shrink.
Why did my archive come out the same size?
The input files were already compressed. The status line notes this. Bundling them still packs many files into a single download, which is useful for email attachments or cloud uploads.
Are my files uploaded to compress them?
No. The archive is built in your browser with JSZip and saved straight to your downloads folder.
What does Store only do?
It packs files into one bundle without DEFLATE compression, which is fastest when you only need a single combined file to send.
Can I extract archives here?
This utility creates .zip archives. Windows, macOS and phones can open and extract them natively without extra software.