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File tools

File tools — extract, convert, analyse

The hub for SnapToolz' file utilities — reshaping data, opening archives, and tidying up the odds and ends of a working folder. Whether you need to turn a spreadsheet export into JSON, crack open a ZIP, work out what's eating your disk, or batch-clean a pile of messy filenames, this page points you at the right tool.

  • No uploads — files stay on your device
  • WebAssembly fast
  • Works offline
  • 100% free, no sign-up

4 tools in File tools

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CSV ↔ JSONNew

Convert between CSV and JSON with table preview.

ZIP Creator & ExtractorNew

Create ZIP archives or inspect and extract them — all in your browser.

Filename CleanerNew

Turn messy filenames into clean SEO-friendly slugs. Batch rename + ZIP export.

File Size AnalyzerNew

Visual breakdown of file sizes by extension.

Start here: which file tool for which job

Four tools cover the common working-folder chores. Pick by the task and follow the link:

You want toUseNote
Convert CSV to/from JSONCSV / JSONWatch quoting + type inference
Extract a ZIP archiveExtract ZIPMany DOCX/XLSX files are ZIPs too
See what's eating disk spaceSize AnalyzerKB vs KiB is the usual confusion
Clean messy filenamesFilename CleanerPortable across Windows/macOS/Linux

Who this hub is for, and where to begin

Data analysts moving records between formats, developers inspecting a downloaded archive, anyone auditing where their disk space went, and people prepping a batch of files for upload with consistent names — this is the shared starting point. These tools earn their keep on private, business data (a customer CSV export, an internal archive, an analytics dump) that you'd rather not feed to a stranger's server.

Not sure which you need? Reach for CSV / JSON to reshape tabular data, Extract ZIP to open or build an archive, Size Analyzer to break down a folder by extension, and Filename Cleaner to batch-rename into clean, portable slugs. The individual tool pages cover the format gotchas in depth.

Frequently asked questions

  • Are my files uploaded anywhere?

    No. Every SnapToolz tool runs entirely in your browser using JavaScript and WebAssembly. Files are read locally, processed in memory, and the result is offered as a download. There is no backend.

  • Can I extract password-protected ZIPs?

    Standard password protection isn't supported in the browser yet. Most ZIPs you'll encounter (downloads, GitHub releases, exports) are unprotected and work fine.

  • What's the largest CSV I can convert?

    Up to your device's available memory — typically 50–500 MB on modern laptops. The parser streams the file, so you usually don't run out of RAM mid-conversion.

  • How does this compare to convertio, cloudconvert, or zamzar?

    Server-based file converters upload your file, process on their hardware, and stream the result back. That's necessary for heavyweight conversions (video transcoding) but overkill for CSV↔JSON, ZIP extraction, or file-size analysis — what SnapToolz' File Tools cover. Browser-based versions are faster on small/medium files, work offline, and never put your data through a third-party pipeline. Useful when the dataset is private (customer exports, internal data, analytics dumps).

  • Is everything free?

    Yes — every tool in this category and on the entire site is free with no sign-up, no daily limit, and no watermark.

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