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A focused collection of tools for everyday developer work.
TOOL INDEX
Images & media first · 105 tools in four sections
01 / 26 TOOLS
Images & media
Image compressor
Compress JPG, PNG, and WebP images with quality control.
Image resizer
Resize images by pixels or by aspect ratio.
Image cropper
Crop images by ratio or a custom selection.
Image converter
Convert images between PNG, JPG, WebP, and AVIF.
Image to Data URL
Turn an image into a Data URL for HTML or CSS.
Data URL to image
Preview and download image content from a Data URL.
SVG optimizer
Clean redundant SVG data and reduce icon size.
SVG to PNG
Export an SVG as a PNG at a chosen size.
Favicon generator
Generate common favicon sizes from an image.
Sprite sheet
Combine small images into a CSS sprite sheet.
Color picker
Pick precise color values from an image or palette.
Color converter
Convert colors between HEX, RGB, HSL, and OKLCH.
Color palette
Generate complementary, analogous, and neutral palettes.
Contrast checker
Check whether foreground and background colors meet WCAG.
Gradient generator
Create linear and radial CSS gradients visually.
Box-shadow generator
Tune parameters and copy a CSS box-shadow.
Border-radius generator
Generate complex corner radii and copy CSS.
CSS filter generator
Preview and generate blur, hue-rotate, and other filters.
Aspect ratio calculator
Calculate common image and video aspect ratios.
Image metadata
Inspect image dimensions, type, and basic metadata.
EXIF cleaner
Remove location and camera information from images.
QR code generator
Generate a downloadable QR code from text or a link.
Barcode generator
Generate barcodes in common formats.
Audio metadata
Read audio duration, format, and basic encoding details.
Video poster extractor
Extract a poster frame from a chosen video timestamp.
Infinite canvas
Create flowcharts, mind maps, wireframes, product sketches, meeting notes, and knowledge maps with freehand strokes, shapes, arrows, text, and an eraser. Includes zoom, undo, redo, and PNG / SVG export.
No matching tools in this category.
02 / 28 TOOLS
Text & data
X post mockup
Create a customizable X post mockup for prototypes, presentations, and social content layouts.
WeChat iOS chat mockup
Create a customizable WeChat iOS chat mockup for prototypes, teaching, stories, and content layouts.
WeChat Android chat mockup
Create a customizable WeChat Android chat mockup with gesture, three-button, or hidden navigation.
JSON formatter
Format minified or messy JSON into a readable structure.
JSON to CSV
Convert a JSON array into a downloadable CSV table.
CSV to JSON
Turn CSV data into JSON ready for an API or script.
YAML to JSON
Convert configuration content between YAML and JSON.
JSON to YAML
Generate a hand-editable YAML configuration file.
XML formatter
Format XML and inspect its node hierarchy quickly.
HTML entities
Encode or decode HTML entities to debug escaping issues.
URL encode / decode
Encode and decode URL parameters safely.
Base64 encoder
Encode and decode text and file content as Base64.
JWT decoder
Inspect a JWT header and payload.
UUID generator
Generate batches of UUID v4 values ready to copy.
Timestamp converter
Convert between Unix timestamps and readable dates.
Date calculator
Calculate date differences, offsets, and working days.
Number base converter
Convert numbers between binary, octal, decimal, and hex.
Regex tester
Test regular expressions against example text.
Regex builder
Build readable regular expressions from common patterns.
Text diff
Compare additions, removals, and edits between two texts.
Line sorter
Sort, deduplicate, and clean a multiline list.
Text counter
Count characters, words, lines, and reading time.
Case converter
Convert between camelCase, snake_case, and more naming styles.
Slug generator
Create clean, readable URL slugs from titles.
Markdown TOC
Generate a table of contents from Markdown headings.
Markdown table
Generate Markdown table syntax from tabular data.
Lorem ipsum
Generate placeholder text by paragraph, sentence, or length.
Random test data
Generate test data such as names, emails, and numbers.
No matching tools in this category.
03 / 25 TOOLS
Files & PDF
Merge PDFs
Merge multiple PDF files in a chosen order.
Split PDF
Split a PDF by page ranges.
Compress PDF
Reduce PDF size for sharing and archiving.
PDF to images
Export PDF pages as PNG or JPG images.
Images to PDF
Combine multiple images into a single PDF.
Add PDF page numbers
Add page numbers to PDF pages with position styles.
PDF watermark
Add a text watermark to a PDF.
PDF metadata
Inspect and clean PDF title, author, and other metadata.
Extract PDF text
Extract plain text from a text-based PDF.
Protect PDF
Set an open password on a PDF and restrict copying and modification.
ZIP viewer
View the file list inside a ZIP.
Create ZIP
Package multiple files into a ZIP download.
File hash
Calculate SHA-256, SHA-1, and MD5 file digests.
File compare
Compare two files by size, type, and hash.
MIME lookup
Look up the MIME type for a file extension.
File extension lookup
Look up what an extension means and how to open it.
Text to file
Save text as a TXT, JSON, or CSV file.
File to text
Read a text file and copy its contents quickly.
CSV preview
Preview a CSV file as a table.
JSON file maker
Validate JSON and download it as a formatted file.
Markdown to HTML
Render Markdown into copyable HTML.
HTML to Markdown
Convert simple HTML content into Markdown.
Text to PDF
Typeset plain text and export it as a PDF.
Document page estimator
Estimate document pages from word count and layout.
Batch file naming
Preview batch rename rules and export a file list.
No matching tools in this category.
04 / 26 TOOLS
Developer & web
Claude AI IP risk check
Check the Claude AI egress IP, risk score, DNS, WebRTC, and device information.
HTTP status lookup
Look up HTTP status meanings and common use cases.
HTTP headers
Parse and format request or response headers.
cURL builder
Build a copyable cURL request from a form.
Fetch snippet
Generate JavaScript fetch code from request parameters.
API request tester
Send a simple API request and inspect its response.
URL parser
Break a URL into protocol, host, port, and query params.
DNS record formatter
Format common DNS records for inspection and sharing.
Cron builder
Build a Cron expression with visual options.
Chmod calculator
Convert between symbolic and numeric Unix permissions.
Gitignore generator
Generate .gitignore content for a tech stack.
JSON Schema generator
Infer a basic JSON Schema from a JSON example.
OpenAPI preview
Preview an OpenAPI document and its endpoints.
SQL formatter
Format SQL indentation, keywords, and line breaks.
SQL IN builder
Generate a SQL IN clause from a list.
Code minifier
Minify JavaScript, CSS, or HTML snippets.
Code beautifier
Format common frontend code snippets.
CSS unit converter
Convert between px, rem, em, vw, and more.
CSS specificity
Calculate selector specificity and explain precedence.
HTML preview
Preview HTML, CSS, and JavaScript in isolation.
JavaScript console
Run and debug small JavaScript snippets.
TypeScript playground
Try TypeScript types and syntax snippets.
Semver comparator
Compare versions and inspect upgrade ranges.
Design token generator
Generate CSS variable tokens from colors and spacing.
Keyboard event inspector
Inspect browser keyboard event key and code values.
Viewport info
Inspect the current screen and browser viewport size.
No matching tools in this category.