Batch File Size Analyzer
See a sorted size breakdown of a batch of files, with each file's share of the total.
What is Size Analyzer?
A quick weigh-in for a folder before you zip, upload or back it up. It answers the question every large upload raises: what is making this so big?
How it works
Sizes come straight from the file list the browser hands over, so the breakdown is instant and nothing is read or uploaded. Files are sorted largest-first with a proportional bar, and the CSV export keeps exact byte counts for a spreadsheet.
- Add your files. Drop files (or a whole folder) onto the drop zone. Browsers hand the contents straight to the page, so nothing is uploaded.
- Choose the options. Pick the format, compression, naming rule or split size. Any change re-computes the preview immediately.
- Download the result. Run the tool and grab the archive, the extracted files or the report. Multi-file results come back as a single .zip.
Examples
A 240 MB photo folder → a 52 MB .zip
JPEGs are already compressed, so the archive only saves 10–15% — but adding the folder structure and a manifest makes the upload verifiable.
A download cut off at 1.4 GB
The File Splitter cuts it into 500 MB chunks that fit the host's limit, and the File Joiner reassembles them, refusing any set with a missing part.
A release bundle with checksums
The Manifest Generator writes sha256sum-style lines next to the files, so the recipient can prove the download arrived intact.
Common mistakes
Expecting ZIP to shrink photos, video or audio
Those formats are already compressed; deflate typically saves single digits on them. ZIP is at its best on text, JSON, CSV, logs and source code.
Treating ZipCrypto as real encryption
Traditional ZIP encryption is legacy and breakable. It stops casual snooping only — for secrets, encrypt the contents with AES-256 first.
Renaming extensions to convert a file
Changing .png to .jpg does not change the bytes inside. Some programs will refuse the file, or display garbage. Use a real converter when the format must change.
Splitting without keeping the suffixes
The parts carry .001, .002 … suffixes on purpose: the joiner orders them by number and fails loudly when one is missing, instead of producing a corrupt file.
Frequently asked questions
Why does the total differ from the folder's size on disk?
The breakdown adds up file contents. File systems also store cluster allocation, directory entries and metadata, so the on-disk footprint is usually a little larger.
Does it measure compressed size?
No — these are the raw byte counts. To find out how much a .zip would save, run the ZIP Creator and compare the reported before/after figures.
Are subfolders included?
Yes, when you pick a folder the browser hands over every file inside it, subfolders included, and each file is measured separately.