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Turn a CSV into cleanXLSX or JSON, locally.convert CSV to XLSX and JSON Windows

CSVPrune exports properly quoted UTF-8 CSV, structured JSON, or a formatted XLSX workbook with leading zeros and long IDs intact — no upload, no Save-As corruption, saved as a repeatable step.

CSVPrune exports cleaned data to properly quoted UTF-8 CSV, structured JSON, or formatted XLSX with leading zeros preserved — on your machine, saved as a repeatable step.

$14.99 USD — Perpetual License

One-time purchase · Lifetime updates · Delivered via the Microsoft Store

Get it from Microsoft Store

Purchased and updated securely through the Microsoft Store. No account needed on our site, no subscription, and a Microsoft receipt for easy corporate expensing.

Full CSVPrune overview
One-time purchase No telemetry Local-first

windows · local-first · no telemetry · one-time purchase

If this sounds like your week

You have a CSV, but the next step needs XLSX or JSON.

A stakeholder wants a formatted spreadsheet, an importer expects JSON, or a system needs clean UTF-8 CSV with proper quoting. Getting there usually means another tool, and the quick ones online want you to upload the file first.

Where tooling usually breaks

Save As and web converters both quietly corrupt data.

Excel's "Save As" can re-encode text, drop leading zeros, and turn long numbers into scientific notation, while online converters add an upload of data that may be sensitive — and neither gives you a clean, repeatable result you can trust for an automated pipeline.

Where CSVPrune lands

Export clean CSV, JSON, or XLSX — locally, with the details right.

CSVPrune exports your cleaned data to properly quoted UTF-8 CSV, structured JSON, or a formatted XLSX workbook, or copies it straight to the clipboard. Leading zeros and long identifiers are preserved, quoting follows the standard, and an audited export can add a full before/after sidecar — all on your machine, with the conversion saved as part of a replayable recipe.

$14.99 USD — Perpetual License

One-time purchase · Lifetime updates · Delivered via the Microsoft Store

Get it from Microsoft Store

Purchased and updated securely through the Microsoft Store. No account needed on our site, no subscription, and a Microsoft receipt for easy corporate expensing.

Learn more about CSVPrune

windows · local-first · no telemetry · one-time purchase

What you get

Feature highlights

Opens what Excel chokes on

scroll, search, filter, and type-aware sort 100k+ row files instantly in a virtualized grid—no 1,048,576-row wall and no freezing.

Fixes broken exports

auto-detects and overrides delimiters (comma, semicolon, tab) and encodings (UTF-8/16, Latin-1) so CRM, Shopify, and Google Forms files stop arriving garbled—and leading zeros and long IDs are never silently mangled.

Deterministic cleaning pipeline

trim, normalize emails, find/replace (literal or regex), coerce numbers, currency, dates, and booleans, dedupe by any key column, and point-and-click prune rows—composed in the order you choose.

Live formula engine

create calculated columns with real-time preview and a ghost column in the grid, using column references, arithmetic, string functions, and helpers like coalesce()—saved as replayable steps.

Clean once, replay forever

save any sequence as a named recipe, apply it in one click, batch-run it across a folder, or point a watch folder at it so every new CSV is cleaned automatically.

Private by design

every row stays in local memory, with no cloud, no telemetry, and no network calls—auditable with Wireshark. Export to CSV, JSON, or XLSX, or run an audited export with a full before/after sidecar.

Especially when

  • Clean and dedupe messy CSV exports on Windows without uploading sensitive data to a web-based CSV cleaner
  • Open, search, and sort CSV files that are too large or too slow to handle in Excel
  • Fix CSV encoding and delimiter problems (UTF-16, Latin-1, semicolon, tab) that corrupt CRM, Shopify, and Google Forms exports
  • Replay the same cleaning steps on recurring files automatically instead of repeating them by hand every week

Who benefits

Real-world scenarios

The hand-off

Finance wants a formatted XLSX and an internal tool needs JSON, but Save-As keeps dropping leading zeros and the online converters want you to upload the file first.

CSVPrune exports the same cleaned data to XLSX and JSON locally with identifiers intact, and you save the conversion as part of the recipe so future hand-offs are one click.

The garbled European export

A semicolon-delimited, UTF-16 export from a European system opens with accented names turned to mojibake and every field crammed into a single column, with order IDs losing their leading zeros.

You set the delimiter and encoding in CSVPrune, the columns split correctly and the accents return, and because values stay text the leading zeros and long IDs are preserved on export.

The weekly tidy-up

A partner export arrives with trailing spaces, mixed-case emails, and a few blank rows every week, and you fix the same things by hand in a spreadsheet each time before anyone can use it.

You compose the trim, email-normalize, and row-prune steps once in CSVPrune, watch the live counts confirm the changes, and save it as a recipe so next week's file is a single click.

Deep dive

Converting CSV to XLSX or JSON without corruption or uploads

Conversion sounds trivial until the details bite. Excel's Save As can silently re-encode text, strip the leading zeros off ZIP codes and account numbers, and turn long order IDs into scientific notation; online converters solve the format problem but reintroduce the privacy one by asking you to upload the file first; and neither gives you a clean, repeatable output you can wire into an automated process. CSVPrune exports your cleaned data locally to the format the next step actually needs. Choose properly quoted UTF-8 CSV (with the original delimiter or a clean one), a structured JSON array suitable for an API or importer, or a formatted XLSX workbook for stakeholders who expect a spreadsheet — or copy the result straight to the clipboard. Throughout, values are treated as text unless you deliberately coerced them, so identifiers and leading zeros survive the round trip, and CSV output follows RFC-4180 quoting so it reads correctly everywhere. For regulated hand-offs, an audited export writes the converted file alongside a sidecar that records the before and after of every changed cell. And because conversion is just the final step of a pipeline, it can be saved into a recipe and run by batch or watch-folder automation — so "give me this as XLSX every week" stops being a manual chore and becomes part of the same one-click flow.

Trusted by pragmatic desktop users

Built for people who prefer tools that stay local.

Real workflows: focus timers that stay visible, batches that never leave the disk, and renames you can rewind.

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Senior Accountant · Manufacturing Company · United States · PinPoint

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Quotes are shown with customer permission; names and locations appear as reviewers provided them.

Our Core Moat

Engineered to respect your system boundaries.

System Resource Monitor (Idle State Comparison)
Automata Labs sub-5MB idle memory footprint compared to generic Electron applications

Lightweight Native Stack

Compiled Rust core wrapped inside an optimized Tauri shell. No heavy background node loops or duplicate Chromium engines cooking your memory footprint (<5MB idle RAM).

100% Local-First Privacy

Executes entirely on-device with full offline isolation. Absolute zero background telemetry policies, no metrics aggregation, and zero mandatory cloud-sync accounts.

Perpetual Fallback Licenses

Pay a single, clear one-time purchase price. Own your specific native software utility execution tier permanently without artificial subscription paywalls or ongoing usage tax.

FAQ

Straight answers—no glossary dump

How do I convert a CSV to XLSX or JSON without uploading it?

CSVPrune exports your data locally to properly quoted UTF-8 CSV, structured JSON, or a formatted XLSX workbook — or copies it to the clipboard — with no upload involved. Leading zeros and long identifiers are preserved rather than mangled the way Save As often does, and CSV output follows RFC-4180 quoting. The conversion can be saved as part of a recipe, so producing the same format every week becomes a one-click or fully automated step.

Is CSVPrune private, and does it work offline?

Yes on both counts. CSVPrune runs entirely on your machine with no cloud, no telemetry, and no network access of any kind — there is no networking code in the app, so it works fully offline and nothing you load is ever uploaded. Your data stays in local memory for the session, and only minimal settings such as window state and recent paths (which you can turn off) are saved to disk. You can verify the zero-network behaviour with a connection monitor.

What file types and sizes does CSVPrune handle?

CSVPrune loads CSV files with comma, semicolon, or tab delimiters (auto-detected, with a manual delimiter and encoding override for UTF-8, UTF-16, and Latin-1) and is designed for large files, with smooth performance on hundred-thousand-row datasets and guidance up to around 500 MB. You can export your cleaned data to CSV, JSON, or XLSX, copy it to the clipboard, or use an audited export that adds a full before/after sidecar for compliance.

How much is CSVPrune, and is it a subscription?

CSVPrune is a one-time purchase on the Microsoft Store — no subscription and no account required to use it. You own the version you buy and it keeps working offline. Use the Microsoft Store button on this page for the current listing and price, and because the privacy posture is structural rather than a setting, you can verify the local-only behaviour yourself at any time with a network monitor.

Related pages

Clean the messy export in one repeatable pass. Remove duplicate rows — including the ones Excel misses. Open the CSV that makes Excel freeze — instantly. Fix the garbled export before it corrupts your data.

Clean it once.
Replay it forever—on your machine.

CSVPrune opens the files that break Excel, fixes encoding and delimiter garble, dedupes by any column, builds calculated columns with a live formula engine, and saves your steps as a replayable recipe. Export to CSV, JSON, or XLSX. No cloud, no telemetry—verifiable with Wireshark.

$14.99 USD — Perpetual License

One-time purchase · Lifetime updates · Delivered via the Microsoft Store

Get it from Microsoft Store

Purchased and updated securely through the Microsoft Store. No account needed on our site, no subscription, and a Microsoft receipt for easy corporate expensing.

Open full product page

Technical specifications

Technical specifications for procurement

Spec Implementation
Data Sovereignty Every row stays in local Rust in-memory state for the session; the full dataset never crosses to the cloud and is serialized only for your explicit export or clipboard copy
Telemetry Status None; zero network code, verifiable with Wireshark or Resource Monitor
Core Runtime Rust + Tauri v2 backend (heavy CSV parsing, cleaning, and profiling stay in Rust) with a React 18 virtualized grid
Network Requirements Fully functional offline; no network access requested in the Tauri capability set
Deployment Compatibility Windows 10 and 11 via the Microsoft Store; macOS universal build via direct download
Import Auto-detects comma, semicolon, and tab delimiters; manual delimiter and UTF-8/16 + Latin-1 encoding override
Cleaning ops Trim, normalize emails, find/replace (regex), coerce number/currency/date/boolean, dedup-by-key, visual row prune, calculated columns
Automation Saved recipes, batch-run across a folder, and watch-folder auto-clean of new files
Export CSV, JSON, or XLSX, plus audited export with a full before/after sidecar JSON; ~500 MB file ceiling