Excel to CSV — Convert XLSX to CSV
Convert Excel spreadsheets (.xlsx) to CSV format.
Drop your XLSX file hereTap to select a file
Supports XLSX, up to 50MB
What to do next
Related tools
About Excel to CSV
Excel to CSV is built for web and productivity utility jobs that fit cleanly into a browser tab. Convert Excel spreadsheets (.xlsx) to CSV format. The processing runs in the page itself, which is why the controls update instantly when you change settings and why a freshly loaded page is ready to do real work the moment it becomes interactive.
If you fit any of these descriptions, Excel to CSV should slot cleanly into your workflow: product managers comparing options; site owners auditing pages; creators experimenting with formats. The tool keeps the controls focused on what matters for each of these use cases.
The execution path is auditable from the page itself: open developer tools, switch to the Network tab, run a job. The requests you see are static-asset GETs for the engine and the page resources. The actual work is JavaScript code running against the bytes already in your tab's memory.
Behind the controls you see, the ExcelJS workbook engine is doing the actual web and productivity utility. Formats are detected on load and the engine produces a deterministic output for any given input + options combination — useful when you need to re-run a job and expect identical results.
The right moment to reach for Excel to CSV is when you have a focused web and productivity utility job that fits inside a browser tab. Open the page, drop in the file or paste your input, choose the options that matter, and the tool returns the result.
If your task needs more than one step, chain Excel to CSV with CSV to JSON, JSON to CSV, and JSON Formatter. Each tool produces output that is a clean input to the next, so multi-step workflows are just a matter of opening the next tool in a new tab and continuing.
The download is delivered as `{name}.csv` the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
On limits: 50 MB per file is the ceiling. Output formats and quality settings are listed in the controls panel above, and they apply to every run.
The transformation in Excel to CSV is deterministic — the same input plus the same options produces the same result every run. That predictability matters when the result has to match an upstream specification or be reproducible later.
Some context on why Excel to CSV exists in this form: modern File APIs, high-performance JavaScript engines, and well-maintained open-source libraries now make it possible to perform web and productivity utility work entirely in the browser. Excel to CSV is built on top of that capability, which is why a single page can host the full pipeline.
A few practical tips that experienced users of Excel to CSV pick up over time. First, keep your default browser updated — the engine relies on standard web APIs and newer browser versions are noticeably faster than ones from a few years ago. Second, close other heavy tabs before processing a large input; the engine shares CPU and memory with whatever else is open. Third, if you re-run the same kind of job often, your last-used settings are remembered for the rest of the tab session, so subsequent runs are essentially one click.
Common gotchas worth flagging: the supported formats are listed in the upload area. The 50 MB ceiling is per-file, not per-session; you can run as many separate jobs as you like, but a single oversized input will be rejected on load.
Excel to CSV produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
Excel to CSV is intentionally narrow in scope so the common case is fast and the result is predictable. If you ever need a variation it does not cover, browse the rest of the catalog — there is a good chance an adjacent tool already exists, and switching between tools is just a matter of opening another tab.
How it works
- 1Reach the Excel to CSV page in your browser to begin.
- 2Select the web utility file you want to process — drag-and-drop and the file picker both work.
- 3Pick any non-default settings you need. Most users leave the defaults alone for the first run and only revisit if the result needs tuning.
- 4Trigger processing. the ExcelJS workbook engine reads your input, applies the transformation, and writes the result back into the page.
- 5Grab the output named `{name}.csv` as soon as the run completes. You can also copy the result instead of downloading if the next tool in your workflow accepts pasted input.
- 6Repeat the process for additional inputs whenever you need to. The page stays loaded, so subsequent runs are quick.
Common use cases
- Create a placeholder image for a wireframe using Excel to CSV.
- Preview how a result looks before deploying it.
- Validate a setting before circulating it to a team.
- Run a one-off check during a meeting without context-switching.
- Audit a marketing page before launch.
- Plan content without paying for a SaaS dashboard.
- Run a fast accessibility check before publishing.
- Sanity-check a webhook response while debugging.
FAQ
Which Excel formats are supported?
.xlsx files (Excel 2007 and later). .xls files are not currently supported.
Can I choose which sheet to convert?
Yes — if the workbook has multiple sheets, select the one you want to convert.
Are formulas evaluated?
Calculated values are exported. The formulas themselves are not included in the CSV.
What does Excel to CSV do that command-line tools do not?
Desktop apps usually have more advanced features but require installation, maintenance and (often) a licence. Paid online tools are convenient but route your file through their servers and gate downloads behind accounts. Excel to CSV sits in between: free, instant, and private, but intentionally narrow in scope. For one-off jobs and the common web and productivity utility operations, it is usually the lowest-friction choice; for highly specialised work, a dedicated app is still the right answer.
Which browsers are supported by Excel to CSV?
Excel to CSV works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
How long does Favtoo retain my data after using Excel to CSV?
Favtoo keeps no copy of your file because Favtoo never receives your file. Excel to CSV runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.
Do I need to install anything to use Excel to CSV?
No installation is needed. Excel to CSV runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use Excel to CSV on any computer you have temporary access to without leaving anything installed on it.
Is there a programmatic version of Excel to CSV?
Excel to CSV is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (the ExcelJS workbook engine) is open-source and can be used directly from your own code.
What input formats are supported by Excel to CSV?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
Can I self-host Excel to CSV for my team?
Excel to CSV is a static page running an open-source engine in your browser, so a typical corporate firewall does not get in the way as long as it allows JavaScript to load from Favtoo. For teams that need to host it themselves on an internal network, the underlying engine (the ExcelJS workbook engine) is open-source and can be packaged into a private build with the same behaviour. Reach out via the Contact page if that is something you are exploring.
Is Excel to CSV licensed for business use?
Excel to CSV can be used for personal and commercial work alike — there is no separate "business" licence to purchase. The output you generate is yours to use however you want, including in client deliverables, internal documents, or commercial products. Favtoo's only ask is fair, individual use; the tool is not designed to be embedded as a backend service or wrapped behind an API for resale.
Does Excel to CSV match what professional tools produce?
Excel to CSV is built on the ExcelJS workbook engine, which is the same class of engine used by professional web and productivity utility pipelines. For deterministic operations, the output is byte-identical to what an equivalent CLI run would produce; for operations involving a codec or a model, the result is well within the range of what comparable tools generate. If you have a specific reference output you need to match, run a small test job first to confirm the configuration produces what you expect.