Line Prefix and Suffix

Add markers to lines in one step.

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Line Prefix and Suffix User Guide

Add a prefix and suffix to each line. Processing stays in your browser; review the result before copying or downloading.

How to use

Paste text and choose options.
Process and review the result.
Copy or export a TXT file to save the result.

Formats and limits

Each input is limited to 100,000 UTF-16 code units; line endings are normalized to LF.
Results are generated locally in your browser; keep a copy of the original.

Output

UTF-8 text result, available to copy or download as TXT.

Frequently asked questions

Will the original be overwritten?

No. The result is separate text and is cleared when you leave.

The file name and content are only processed in your browser and are not transmitted to the server. The original file will not be overwritten. Please export the required results before leaving the tool.

All tools

Text

Text Case Converter
Convert text to upper or lower case.
Line Whitespace Cleaner
Trim whitespace from each line.
Line Prefix and Suffix
Add a prefix and suffix to each line.
Literal Text Replacement
Replace all case-sensitive literal matches.
Line Numbering
Number lines in input order.
Text List Comparison
Compare two lists to find shared or unique lines.
Text Reverser
Reverse text by Unicode grapheme.
HTML Entity Converter
Escape special characters or decode HTML character references.
UTF-8 Hex Converter
Convert text to UTF-8 bytes or decode valid hexadecimal data.
English URL Slug Generator
Turn English text into a lowercase hyphenated slug.
Text Code Point Viewer
Inspect code points and UTF-16 offsets in logical order.
Markdown Formatter
Organize lists, blank lines, and tables, and retain the original manuscript and content.
Convert Text to UTF-8
Export a copy from UTF-8 or Big5 and check encoding and line breaks.
Text File Merger
Arrange UTF-8 text files, set separation and then merge and export.
Text Statistics
View the number of characters, graphemes, lines, and UTF-8 bytes.
Text Line Cleaner
Remove blank or duplicate lines, sort by clear rules and export.
Text Diff
Compare the two texts line by line to see clearly the differences in additions, deletions and line breaks.

Files

File Hex Viewer
Page through bytes, decimal offsets and ASCII in one file.
ZIP Directory Viewer
Read ZIP central-directory paths and declared sizes, then copy or download a TXT listing.
File Content Comparison
Check the complete file piece by piece to make sure every byte is the same.
Batch File Renamer
Add the prefix and serial number, preview and package it into a renamed copy.
Split Files into ZIP Packages
Divided into independent ZIPs according to capacity, complete delivery list attached.
File SHA-256 Checksums
Batch calculation file summary, copy or export complete checklist.

Images

PNG Alpha Mask Exporter
Convert raw PNG alpha values into a grayscale mask: white is opaque and black is transparent.
ID Photo Cropper
Crop a photo for the selected purpose, manually check its composition, and export JPG.
Image Dimension Annotator
Draw dimension lines on an image, enter values and units manually, then export a PNG.
Dual Image Overlay Comparator
Compare two same-size images in shared coordinates using a split view or crossfade.
Seamless Texture Seam Previewer
Use a 3×3 tile and half-size cyclic shifts to move texture boundaries where they are easy to inspect.
PNG Transparent Border Cropper
Precisely trim fully transparent outer rows and columns by alpha while preserving shadows and transparent holes.
Sprite Sheet Player
Preview multiple SpriteSheets in the same frame size, sort, frame by frame, and adjust playback speed.
Sprite Sheet Studio
Arrange frames, preview animations, export to PNG/JPG/BMP, batch ZIP and projects.
Image Converter & Compressor
Convert JPG, PNG, and WebP to and from each other, adjust size and file size.
Screenshot Redactor
Manually frame and crop, and cover sensitive information in screenshots with solid colors.
Image Background Remover
Identify subjects locally, preview and export transparent PNGs.
Image Stitcher
Arrange multiple pictures vertically, horizontally or in a grid to create a new picture.
Text Watermark
Set the text, position and transparency, and export the annotated image.
Image Color Picker
Click on the original image pixel to copy HEX, RGBA or save the color chip.
Rotate & Flip Images
Rotate 90 degrees, flip horizontally or vertically, and export a new copy.
Round Image Corners
Set the corner radius, preserve transparent corners and export as PNG.
Image Grid Slicer
Slice multiple images using a shared grid, custom names and split ZIP files.
Image Information Viewer
Inspect image dimensions, formats and available details in batches.
Color Contrast Checker
Check the WCAG contrast of the text and background solid color code.
Add Image Borders
Add a solid-color border of equal width around the image to retain the original size.

Audio

WAV Channel Splitter
Split stereo WAV into left and right mono files, preserving every PCM sample.
WAV Audio Trimmer
Cut short WAV audio files, audition, fade and export.
WAV Volume Adjustment
Adjust WAV gain or peak normalization, listen to it and export it.

Data

CSV Column Selector
Select and reorder CSV columns, preserving every cell as text in a new copy.
CSV / TSV Converter
Preview the table, retain text and leading zeros, and export a new copy.
JSON Formatter
Indent or compress JSON, preserving numeric precision and field order.
File Base64 Encoder & Decoder
Convert files to Base64 text, or restore text to files.
URL Encoder & Decoder
Convert text to URL element encoding, or restore percent encoding.
UUID Generator
Generate UUID v4 in batches locally, copy or export the list.

Video

Video Trimmer
Select the start and end times, re-encode locally and export to WebM.
Video Frame Capture
Move to the specified time and export the current screen to PNG.
Remove Audio from Video
Remove the audio track and re-encode the clip to silent WebM.
Video Contact Sheet
Evenly capture multiple time points to create an overview map with time annotations.
Video Information
View size, duration and size of batches, and export TXT/JSON list.
Separate Video & Audio
Split the video into silent WebM and independent audio, pilot and export respectively.