Can I add only a prefix or only a suffix?
Yes. You can leave either the prefix or suffix field completely empty and the tool will only apply the other.
Tool Categories
Free Add Prefix & Suffix to Text Online | 1ClickTools
Batch append custom prefixes, suffixes, or line numbers to every line of text instantly. 100% client-side text formatting tool.
Frequently Asked Questions
How does the serial numbering feature work?
When enabled, it inserts numbers (1, 2, 3, etc.) at the start of each line, using your custom start number and separator (like '. ').
What does the 'Skip Adding to Empty Lines' option do?
If a line contains no characters, this option keeps it completely blank rather than adding the prefix and suffix to it.
Can I download the processed text directly?
Yes, you can download the final output directly as a .txt file by clicking the 'Download' button.
Is there a character limit for prefix and suffix inputs?
No, you can enter any string, including symbols, spaces, or emojis, of any length.
How accurate is this add prefix suffix tool?
All processing runs entirely in your browser using verified algorithms. Results are computed with full double-precision — no server-side rounding or data transmission occurs.