Character Counter
Count characters, lines, and UTF-8 byte size at once
- Analyzer
- Calculation
83 online tools
Developer tools,all in one place
- No sign-up
- Completely free
- Works instantly
2M+uses
Why Web ToolBox
80+ Developer Tools
Encoding, conversion, generation, and validation tools for everyday development work.
Desktop and Mobile
Open the same URL on any device. Nothing to install, and the tools work the same everywhere.
Privacy First
Many tools run directly in your browser, so your input can stay on your device.
Featured Tools
Color Code Converter
View a color code in multiple notations at once
Dummy Image Generator
Generate placeholder images in custom sizes
Heading Extractor
Extract and list heading tags from webpages
Image Compare Slider
Compare two images with a slider
JWT Decoder
Decode and view JWT contents
OGP Checker
Fetch and preview OGP information from URLs
QR Code Reader
Read QR codes from images or camera input
Subdomain Lookup
List all subdomains associated with a domain
Text Diff Checker
Enter two texts and see the diff highlighted in real time
ULID Generator
Generate time-sortable ULIDs with timestamps
Video Frame Extractor
Extract selected video frames as images
Word Counter
Count words, characters, and lines
XML Formatter
Format or minify XML
YouTube Thumbnail Downloader
Get YouTube thumbnails in multiple sizes
Color Code Converter
View a color code in multiple notations at once
Dummy Image Generator
Generate placeholder images in custom sizes
Heading Extractor
Extract and list heading tags from webpages
Image Compare Slider
Compare two images with a slider
JWT Decoder
Decode and view JWT contents
OGP Checker
Fetch and preview OGP information from URLs
QR Code Reader
Read QR codes from images or camera input
Subdomain Lookup
List all subdomains associated with a domain
Text Diff Checker
Enter two texts and see the diff highlighted in real time
ULID Generator
Generate time-sortable ULIDs with timestamps
Video Frame Extractor
Extract selected video frames as images
Word Counter
Count words, characters, and lines
XML Formatter
Format or minify XML
YouTube Thumbnail Downloader
Get YouTube thumbnails in multiple sizes
Color Code Converter
View a color code in multiple notations at once
Dummy Image Generator
Generate placeholder images in custom sizes
Heading Extractor
Extract and list heading tags from webpages
Image Compare Slider
Compare two images with a slider
JWT Decoder
Decode and view JWT contents
OGP Checker
Fetch and preview OGP information from URLs
QR Code Reader
Read QR codes from images or camera input
Subdomain Lookup
List all subdomains associated with a domain
Text Diff Checker
Enter two texts and see the diff highlighted in real time
ULID Generator
Generate time-sortable ULIDs with timestamps
Video Frame Extractor
Extract selected video frames as images
Word Counter
Count words, characters, and lines
XML Formatter
Format or minify XML
YouTube Thumbnail Downloader
Get YouTube thumbnails in multiple sizes
Color Code Converter
View a color code in multiple notations at once
Dummy Image Generator
Generate placeholder images in custom sizes
Heading Extractor
Extract and list heading tags from webpages
Image Compare Slider
Compare two images with a slider
JWT Decoder
Decode and view JWT contents
OGP Checker
Fetch and preview OGP information from URLs
QR Code Reader
Read QR codes from images or camera input
Subdomain Lookup
List all subdomains associated with a domain
Text Diff Checker
Enter two texts and see the diff highlighted in real time
ULID Generator
Generate time-sortable ULIDs with timestamps
Video Frame Extractor
Extract selected video frames as images
Word Counter
Count words, characters, and lines
XML Formatter
Format or minify XML
YouTube Thumbnail Downloader
Get YouTube thumbnails in multiple sizes
All Tools
Collection of handcrafted tools
Text12
HTML Tag Remover
Strip HTML tags and extract text
- Formatter
Line Break & Whitespace Remover
Selectively remove line breaks, tabs, and spaces
- Formatter
Lorem Ipsum Generator
Placeholder text to fill mockups and drafts
- Generator
Text Case Converter
Convert text to upper, lower, and other cases
- Converter
Text Diff Checker
Enter two texts and see the diff highlighted in real time
- Comparison
Text Duplicate Remover
Remove duplicate lines and keep unique ones
- Formatter
Text Line Joiner
Combine multiple lines with any delimiter into one line
- Formatter
Text Prefix Suffix Adder
Batch add prefix and suffix to each line
- Formatter
Text Sorter
Sort text lines by selected criteria
- Formatter
Text Splitter
Split text by a delimiter into one item per line
- Splitter
Word Counter
Count words, characters, and lines
- Analyzer
- Calculation
Data Conversion12
ASCII to HEX Converter
Convert ASCII text to hex in selectable formats
- Converter
Base64 Decode
Decode Base64 strings into plain text
- Decoder
Base64 Encode
Convert text to standard or URL-safe Base64
- Encoder
CSV to JSON Converter
Convert CSV data to JSON output
- Converter
HEX to ASCII Converter
Decode hexadecimal into ASCII text
- Converter
JSON to CSV Converter
Convert JSON data to CSV output
- Converter
JSON to TOON Converter
Convert JSON to TOON for LLM-friendly output
- Converter
JSON to YAML Converter
Convert JSON data to YAML output
- Converter
Number Base Converter
Convert between binary, octal, decimal, and hex
- Converter
TOON to JSON Converter
Convert TOON data to standard JSON
- Converter
URL Encode/Decode
Encode and decode URL special characters
- Encoder
- Decoder
YAML to JSON Converter
Convert YAML data to JSON
- Converter
Code7
HTML Escape/Unescape
Convert between HTML special characters and entities
- Encoder
- Decoder
JSON Formatter
Validate JSON syntax and format it
- Formatter
- Checker
JWT Decoder
Decode and view JWT contents
- Decoder
Regex Checker
Check how regex patterns match your text
- Checker
SQL Formatter
Format SQL for readability across dialects
- Formatter
UUID Validator
Validate UUIDs and detect their versions
- Checker
XML Formatter
Format or minify XML
- Formatter
Security6
Credit Card Validator
Validate card numbers and identify brands
- Checker
CSP Parser
Parse CSP headers and list their directives
- Analyzer
- Checker
Password Generator
Generate passwords in bulk with custom rules
- Generator
SHA Hash Generator
Hash text with SHA-256, SHA-384, and SHA-512
- Calculation
ULID Generator
Generate time-sortable ULIDs with timestamps
- Generator
UUID/GUID Generator
Generate UUID v1 and v4 in bulk
- Generator
CSS9
Border Radius Generator
Adjust border-radius and generate CSS
- Generator
Box Shadow Generator
Adjust box shadows and generate CSS
- Generator
CSS Background Pattern Generator
Generate striped, dotted, and grid backgrounds
- Generator
CSS Cursor Viewer
Preview CSS cursor styles and behavior
- Checker
CSS Filter Generator
Adjust CSS filters and generate the code
- Generator
CSS Gradient Generator
Adjust CSS gradients and generate code
- Generator
Gradient Text Generator
Create gradient text with CSS
- Generator
Squircle Generator
Generate squircle clip-path values and SVG code
- Generator
SVG to CSS Converter
Convert SVG images to CSS code
- Converter
Web7
Heading Extractor
Extract and list heading tags from webpages
- Extractor
- SEO
OGP Checker
Fetch and preview OGP information from URLs
- Checker
- OGP
OGP Image Simulator
Preview OGP image layouts for X and Facebook
- Simulator
- OGP
OGP Tag Generator
Generate OGP meta tags for social sharing
- Generator
- OGP
Suggest Keyword Extractor
Extract Google search suggestions in bulk
- Extractor
- SEO
URL Bulk Opener
Open multiple URLs in new tabs at once
- URL
URL Parser
Parse URLs and extract structured data
- Analyzer
- URL
Color5
Color Contrast Checker
Check contrast ratios for text and backgrounds
- Checker
- Calculation
Color Code Converter
View a color code in multiple notations at once
- Converter
Color Code Extractor
Extract dominant colors and show them in Hex
- Extractor
Color Eyedropper
Pick color codes from any point in an image
- Extractor
Tailwind Color Palette Generator
Convert a base color into an 11-step Tailwind palette
- Generator
Image15
Image Base64 Decode
Decode Base64 strings into image files
- Decoder
- Download
Image Base64 Encode
Convert images to Base64 strings in bulk
- Encoder
Dummy Image Generator
Generate placeholder images in custom sizes
- Generator
- Download
Image Compare Slider
Compare two images with a slider
- Comparison
Image Resizer
Resize images while maintaining aspect ratio
- Converter
- Download
JPG Converter
Convert images to JPG in bulk
- Converter
- Download
Pixel Art Converter
Convert images into pixel art
- Converter
- Download
PNG Converter
Convert images to PNG in bulk
- Converter
- Download
QR Code Generator
Generate QR codes from URLs and text
- Generator
- QR Code
QR Code Reader
Read QR codes from images or camera input
- Decoder
- QR Code
Rounded Corner Image Generator
Round image corners and save as PNG
- Generator
- Download
SVG Blob Generator
Generate organic blob-shaped SVGs
- Generator
- Download
Video Frame Extractor
Extract selected video frames as images
- Extractor
- Download
WebP Converter
Convert images to WebP and reduce file size
- Converter
- Download
YouTube Thumbnail Downloader
Get YouTube thumbnails in multiple sizes
- Download
- URL
Date & Time3
Calculation5
Aspect Ratio Calculator
Calculate aspect ratios from width and height
- Calculation
Golden Ratio Calculator
Check width and height with golden and silver ratios
- Calculation
Nested Border-Radius Optimization
Calculate inner corner sizes for nested elements
- Calculation
Percentage・PX Calculator
Convert percentages and pixels from a parent size
- Converter
PX・Rem Calculator
Convert between PX and Rem using a base size
- Converter
Network2
Frequently Asked Questions
Web ToolBox is a free online tool collection that anyone can use. We offer over 70 web development tools to help designers and developers work more efficiently!
Yes, all tools are completely free to use.
We have various categories including text processing, data conversion, code, images, colors, and more.
Nope, no account required. Just open your browser and start using the tools right away!
Most tools run entirely in your browser, so your data never leaves your device. For tools that need server processing, we use encrypted connections and never store your data.
Use the feedback form on any tool page. We'd love to hear your ideas and tool requests!
Latest versions of Chrome, Firefox, Edge, and Safari work best. Older browsers might have limited functionality.
Yes! We're constantly adding new tools based on your feedback.
Please report it through the feedback form. We'll fix it as soon as possible!
