Delete CSV Comments
Delete comments (lines starting with # or //) from CSV files. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Delete CSV Comments
- 1. Paste the annotated CSV. Add the file to the input pane. Lines beginning with a comment marker are treated as annotations rather than data and are removed wholesale.
- 2. Set the comment markers. Comment prefixes defaults to # and //, covering most conventions. Add your own markers, comma-separated, such as ; for INI-style notes or -- for SQL-flavored ones.
- 3. Copy the pure data. The output contains only genuine records. Copy it into any strict parser that would otherwise choke on the human-oriented lines.
When to use Delete CSV Comments
Delete CSV Comments strips annotation lines from files that mix notes with data. CSV has no official comment syntax, yet scientific instruments, log exporters and careful humans add # and // lines anyway, and standard parsers read them as malformed one-field records.
- Preparing instrument output for analysis. Lab equipment prepends a dozen # lines of calibration metadata to every measurement file. Removing them leaves clean numeric rows that pandas reads without skiprows guesswork.
- Cleaning documented config data. A rate table maintained by hand carries // notes explaining each change. Stripping the commentary produces the machine-only version the billing system actually loads.
- Feeding commented files to strict tools. A JavaScript CSV library treats a # header note as a data row with one weird column. Deleting the comments beforehand avoids patching the parsing code.
Examples
Strip annotation lines
Input
# people name,age // updated 2024 Ada,36
Output
name,age Ada,36
About the Delete CSV Comments tool
Delete CSV Comments does its work locally, right in the browser. Delete comments (lines starting with # or //) from CSV files. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the CSV Tools collection on EditSafely, a set of 133 small, focused CSV utilities that share the same instant, private workspace.
You can shape the output with the Comment prefixes (comma-separated) setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Delete CSV Comments cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.