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Blockify a String

Convert any text into ASCII or Unicode box art. Create bordered text blocks for code comments, README files, and terminal displays.

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Category Text Formatting
Supports multi-line text. Max 50,000 characters.
0 / 50,000
Box Style
1
60
Shadow
Vertical Padding
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About

                
Box-drawing characters emerged from the CP437 codepage era when terminals needed visual structure without bitmap graphics. The challenge lies in calculating uniform padding: each line must match the longest line's width, then receive border characters at precise offsets. A single miscalculation produces misaligned corners. This tool implements proper Unicode box-drawing sets (U+2500 - U+257F) alongside ASCII fallbacks for legacy systems. Multi-line handling splits at w characters while respecting word boundaries - breaking mid-word creates unreadable output. Shadow effects use block elements (ā–‘ā–’ā–“) offset by 1 character position, simulating depth on a 2D plane.
Common failure modes: tabs render inconsistently across systems (some expand to 4 spaces, others 8), and Unicode boxes break in terminals lacking font support. The ASCII mode (+, -, |) guarantees rendering on any system manufactured after 1970. Pro tip: for code comments, use double-line borders (ā•”ā•ā•—) to distinguish headers from single-line dividers.

        

                            
                    ascii art                
                            
                    box drawing                
                            
                    text formatting                
                            
                    unicode                
                            
                    code comments                
                            
                    terminal art                
                    

            

                            

                
Formulas

                
The blockification algorithm computes the required box dimensions from input text properties:
Wbox = max(len(linei)) + 2 Ɨ p + 2
where Wbox is total box width, p is horizontal padding (spaces between text and border), and 2 accounts for left and right border characters.
Hbox = n + 2 Ɨ pv + 2
where n is number of content lines and pv is vertical padding (empty lines above and below text).
Line padding formula for uniform width:
padded = line + " " Ɨ (Wmax āˆ’ len(line))
Shadow offset calculation (applied to border bottom and right):
shadowx = 1, shadowy = 1
Word-wrap boundary detection uses greedy algorithm: split at last space before w characters, or force-break if no space exists within limit.

            

                            

                
Reference Data

                

                    
StyleTop-LeftTop-RightBottom-LeftBottom-RightHorizontalVerticalUse Case
ASCII Simple++++-|Maximum compatibility, legacy systems
Unicode Lightā”Œā”ā””ā”˜ā”€ā”‚Modern terminals, clean aesthetic
Unicode Doubleā•”ā•—ā•šā•ā•ā•‘Section headers, emphasis
Unicode Roundedā•­ā•®ā•°ā•Æā”€ā”‚Friendly UI, chat bubbles
Unicode Heavyā”ā”“ā”—ā”›ā”ā”ƒBold statements, warnings
Unicode Double-Singleā•“ā•–ā•™ā•œā”€ā•‘Mixed emphasis, subtitles
Unicode Single-Doubleā•’ā••ā•˜ā•›ā•ā”‚Alternative mixed style
Hash Box######Comment blocks, shell scripts
Asterisk Box******C-style block comments
Equals Box++++=|Section dividers
Block Fullā–ˆā–ˆā–ˆā–ˆā–ˆā–ˆHigh visibility, banners
Block Mediumā–“ā–“ā–“ā–“ā–“ā–“Shaded borders
Block Lightā–‘ā–‘ā–‘ā–‘ā–‘ā–‘Subtle shading
Braille Dotsā£æā£æā£æā£æā£æā£æDecorative, accessibility
Emoji BoxšŸ”²šŸ”²šŸ”²šŸ”²šŸ”²šŸ”²Social media, casual
                

            

            


    
Frequently Asked Questions

    

        
Your terminal font lacks Unicode box-drawing glyph support. Switch to a font with complete Unicode coverage such as DejaVu Sans Mono, Fira Code, or Consolas. Alternatively, use ASCII Simple style which renders correctly on any system supporting 7-bit ASCII (all modern systems).
Tabs expand to variable widths depending on system settings (commonly 4 or 8 spaces). This tool converts tabs to spaces before processing to ensure consistent alignment. The conversion uses 4-space tabs by default. For precise control, replace tabs with spaces in your source text before blockifying.
The tool accepts up to 50,000 characters. Beyond this, browser memory allocation and rendering performance degrade. For extremely long text, split into multiple blocks. Each block should ideally contain fewer than 100 lines for optimal readability in code comments and documentation.
Yes, but syntax varies. For C/Java/JavaScript, wrap the block in /* */ delimiters. For Python/Ruby/Shell, prepend each line with #. For HTML, use <!-- --> delimiters. The Hash Box style pre-applies # characters making it ideal for interpreted languages.
Shadows append block characters (ā–‘ā–’ā–“) to the right edge and bottom of the box, offset by 1 character position. Light shadow uses ā–‘ (25% density), medium uses ā–’ (50%), heavy uses ā–“ (75%). Shadows increase total width by 1 and height by 1. They render correctly only in terminals supporting Unicode block elements (U+2591 - U+2593).