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 Remove Lines Starting with Certain Text

Use this free online tool to remove lines that begin with specific text. Enter a prefix, paste or upload your text, and remove every matching line. Choose case-sensitive or case-insensitive matching, then copy or download the result. Your text is processed locally in your browser.

⚙️ Filter options

Remove Lines Starting with Certain Text

Use this online tool to remove every line in a text that begins with a word, phrase, or other prefix you specify. It is useful for filtering logs, lists, exported data, and code without affecting lines that contain the same text later in the line.

⭐ What Does This Tool Do?

  • Checks the beginning of each line for your chosen text
  • Removes lines that start with that text and keeps the others
  • Offers case-sensitive and case-insensitive matching
  • Lets you paste text or open a plain text file, then copy or download the result

⚙️ How to Remove Lines by Prefix

  1. Enter the exact text that the unwanted lines begin with.
  2. Paste your content or open a .txt file.
  3. Choose case-sensitive matching if uppercase and lowercase should be treated differently.
  4. Select Remove Lines to see the filtered text.

🔎 Example: Remove Lines Starting with a Prefix

Prefix: WARN:

Input:

INFO: Service started
WARN: Disk space is low
WARN: Retry connection
INFO: Service ready

Output:

INFO: Service started
INFO: Service ready

⚠️ Starts With, Not Contains

The tool only removes a line when the selected text is at the very beginning of that line. For example, the prefix WARN: does not remove 2026-10-29 WARN: Disk space is low, because the line starts with a date instead.

⭐ Useful for Text Files, Logs, and Lists

Remove lines by prefix to filter log levels, discard rows with a known label, clean lists, or remove selected comment markers. Matching is literal text, not a regular expression. The original order of the remaining lines is preserved.

🔒 Private Browser Processing

Text filtering happens locally in your browser. The content you paste or load is not uploaded to a server.

This tool is also known as

  • remove lines starting with a word
  • delete lines beginning with text
  • filter lines by starting text
  • remove rows with a specific prefix
  • delete text lines by prefix

Frequently Asked Questions

Enter the starting text, paste or open your text, and select Remove Lines. The tool removes lines whose first characters match the text you entered.

No. A line is removed only when it begins with the chosen text. Text appearing later in a line is left untouched.

Yes. Enter a word, phrase, label, symbol, or other literal text to use as the starting prefix.

Matching is case-insensitive by default. Turn on Case-sensitive match to distinguish uppercase and lowercase characters.

Yes. Enter a log prefix such as WARN: or DEBUG: to remove lines that begin with that label.

No. The prefix is treated as literal text, so characters such as a period or asterisk are not interpreted as regular-expression operators.

Yes. Open a plain .txt file using the file input, then enter a prefix and remove the matching lines.

Use Copy to place the result on your clipboard or Download .txt to save it as a text file.

Yes. Lines that do not start with the selected text remain in their original order.

No. The tool processes pasted and loaded text in your browser, and does not upload it to a server.

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