How to remove a prefix from every text line
Remove suffixes from multiple lines at once
Remove prefixes and suffixes without changing case
Example: clean a list of text lines
Copy or download the cleaned text
Remove text prefixes in your browser
Features explained
Prefix removal
Removes the specified prefix only when a line starts with that exact string, subject to the Case Sensitive setting.
Suffix removal
Removes the specified suffix only when a line ends with that string after prefix processing.
Case-sensitive matching
Enabled by default. When disabled, matching compares lowercase versions of the text while removing the matching number of characters from the original line.
Copy to clipboard
The Copy button lets you copy the generated output for use in another document, editor, or application.
Download output
The Download button saves the generated text as a file. The exact filename and file format are not established by the available processing code.
Load example
Load Example provides a way to try the tool with sample text before using your own lines.
Clear and reset
Clear lets you remove the current working text and start again. The exact reset behavior for individual options is not established by the processing code.
What can you use it for?
Clean prefixes from copied lists
Remove a repeated identifier such as user_ from each matching line in a pasted list.
Remove file extensions from line endings
Remove a matching ending such as .txt from each line when preparing a list of filenames.
Prepare text for spreadsheets
Clean repeated beginning or ending strings before pasting your lines into a spreadsheet.
Tidy log and identifier lists
Remove a known prefix or suffix from log entries, labels, or identifiers without changing unrelated text.
Clean text before editing code
Strip a repeated marker from matching lines before moving the text into a code editor.
Tool information
| Tool mode | removePrefixSuffix |
|---|---|
| Processing | Client-side browser processing |
| Prefix default | Empty string |
| Suffix default | Empty string |
| Case sensitivity default | Enabled (true) |
| Input structure | Text split into lines and joined with newline characters |
| Matching behavior | Starts-with prefix and ends-with suffix checks |
| Output | Processed plain text |
Benefits
- Removes matching text from multiple lines in one operation.
- Lets you remove a prefix, suffix, or both.
- Preserves unmatched lines instead of removing text that does not match.
- Provides a case-sensitive setting that can be switched off.
- Supports copying and downloading the processed output.
Limitations
- A prefix is removed only when it appears at the beginning of a line.
- A suffix is removed only when it appears at the end of the line after prefix processing.
- Only one prefix value and one suffix value are accepted by the processing logic for a run.
- The tool does not remove matching text from the middle of a line.
- When case sensitivity is enabled, differences in letter case prevent a match.
- No maximum input length, supported download filename, or download format is established by the available code.
How your text is processed
The tool's text-removal logic runs in the browser. The available implementation does not show a fetch or API call for processing the text. This supports describing the text transformation as client-side processing, but it does not establish how the surrounding website handles analytics, hosting logs, or other data.
Tips
- Enter only the characters you want removed in Prefix or Suffix.
- Leave Prefix empty if you only want to remove line endings.
- Leave Suffix empty if you only want to remove line beginnings.
- Keep Case Sensitive enabled when uppercase and lowercase must be treated differently.
- Turn Case Sensitive off when a prefix or suffix should match regardless of letter case.
- Check Output Text before using Copy or Download.
Frequently asked questions
How do I remove a prefix from every line online?
Enter the exact beginning string in Prefix and check Output Text. The tool removes that string only from lines that start with it. Lines without a matching beginning remain unchanged.
Can I remove a suffix from multiple text lines?
Yes. Enter the ending string in Suffix. Each line is checked after any matching prefix has been removed, and the suffix is removed only if the remaining line ends with it.
Can I remove both a prefix and suffix at once?
Yes. Fill in both Prefix and Suffix. The tool checks the prefix first, then checks the resulting line for the suffix. Either field can remain empty when you only need one type of removal.
How do I remove text without matching letter case?
Yes. Turn off Case Sensitive to ignore differences between uppercase and lowercase letters during matching. The tool compares lowercase versions of the strings and removes the matching characters from the original line.
Does this tool remove text from the middle of a line?
No. The processing logic checks only the start of a line for Prefix and the end for Suffix. Text that appears elsewhere in a line is not removed by these options.
Can I clean a list of filenames in the browser?
Yes. Paste the filenames into Input Text and specify a matching beginning or ending. For example, Suffix can contain .txt when you want to remove that ending from filenames that actually end with it.
Can I remove a prefix without uploading a text file?
Yes. You can paste text directly into Input Text. The transformation logic runs in the browser, and the available implementation does not show an API call for the text-removal operation.
How do I copy or download the cleaned lines?
Use Copy to copy Output Text or Download to save the result. The code confirms both controls are available, but it does not establish the exact downloaded filename or file format.
What happens when a line has no matching prefix?
The line stays unchanged by the prefix-removal step. The tool can still remove a matching suffix afterward, because suffix matching is checked against the line after prefix processing.