Text Prefix/Suffix Appender

Paste or type your lines into the input textarea. Enter your prefix (text to add before each line) and suffix (text to add after each line) in the dedicated fields. The output updates instantly — no button to press. Use the preset buttons for common formats like SQL quotes, JSON strings, or HTML tags. Results appear in real time in the output panel, ready to copy or download.

Yes. Click the SQL IN Clause preset button. It automatically sets the prefix to ' (single quote) and the suffix to ', (quote followed by comma). Each line becomes a quoted value ready for use in WHERE column IN ('value1', 'value2', 'value3') syntax. Toggle Ignore Blank Lines to skip empty rows, then copy or download the result.

Yes. The prefix and suffix fields accept any text, including spaces, tabs, HTML tags, special characters, and Unicode. For example, use <li> as prefix and </li> as suffix to generate an HTML list. Use a tab character (copy-paste from a text editor) as prefix for indented output. The tool preserves your exact prefix and suffix text as entered.

Yes. All processing is 100% client-side. Your text is processed using native JavaScript string operations in your browser. No data is uploaded to any server, stored in any database, transmitted over any network, or logged anywhere. The tool works fully offline after the initial page load. This makes it safe for sensitive data including database values, proprietary code, and confidential business information.

Yes. The Ignore Blank Lines option (ON by default) skips empty lines during processing, keeping the output clean. Toggle it OFF to process blank lines as-is. The Preserve Empty Lines option keeps the line count consistent with the input. The statistics panel shows exactly how many blank lines were detected and how they were handled.

Paste all your strings into the input area, one per line. Click the JSON String or SQL IN Clause preset depending on your format. The tool processes all lines instantly using O(N) line-by-line operations. For large datasets (50,000+ lines), processing automatically offloads to a Web Worker to keep the browser responsive. You can copy the result or download as a .txt file.

Leave the prefix field empty. Type a comma (,) in the suffix field. Every line in the output will have a comma appended. This is useful for creating comma-separated lists, CSV data preparation, and language syntax that requires trailing commas.

Use the SQL IN Clause preset to wrap values in single quotes with comma separators. For INSERT statements, copy the output and paste it into your VALUES clause. The tool handles large lists efficiently — 10,000 values are processed in milliseconds. All special characters including apostrophes and quotes are preserved as-is.

Click the JSON String preset. It sets the prefix to " (double quote) and suffix to ", (quote plus comma). Each line becomes a string element in JSON array format. Remove the trailing comma from the last element if needed, then wrap the entire output in square brackets to complete the JSON array.

The tool accepts .txt and .csv files. Upload via the Upload File button or drag and drop files directly onto the input area. Files are read locally using the FileReader API — they are never uploaded to any server. The tool automatically detects UTF-8 encoding and handles Unicode characters including emoji and international scripts.

Yes. The tool supports 250,000+ lines of text. When the input exceeds 50,000 lines, processing is automatically offloaded to a dedicated Web Worker that runs on a separate thread. The browser remains fully responsive with a progress indicator showing real-time status. The output updates progressively and never blocks the user interface.

Yes. The interface is fully responsive with large touch targets (44px+), sticky action buttons, and safe spacing optimized for mobile screens. On mobile, the input and output panels stack vertically. All features including presets, file upload, and export work on touch devices.