Professional collection of online developer tools including text processors, encoders/decoders, image converters, screen testing utilities, and calculation tools. All tools work offline and prioritize your privacy.
Beautify and validate JSON data format
Quick Base64 encoding and decoding
URL encoding and decoding tool
Analyze keyword frequency and density in text, support Chinese and English tokenization
Download TikTok videos without watermark
Generate custom MP4 test videos with text/images and voice synthesis
Convert videos to GIF animations online with custom settings
Convert GIF animations to MP4, WebM, or MOV video formats
Extract audio from video files and save as MP3, WAV, or AAC
Convert videos between different formats with quality control
Resize videos and change resolution to 4K, HD, or custom sizes
Professional WebGPU vs Canvas2D performance comparison tool
Generate MD5, SHA256 and other hash values
Calculate file checksums with MD5, SHA-256, SHA-384, SHA-512, CRC32, xxHash, BLAKE3 using Rust+WASM
Parse and view JSON Web Token content
Generate various versions of UUID
Convert sprite sheets to animations with frame selection and GIF export
Visually test if keyboard keys are working properly
Convert between timestamp and datetime
Calculate date differences and date arithmetic
Generate secure random passwords (no data saved)
Convert between Hex, RGB, HSL and other color formats
Generate favicons in multiple sizes with customizable borders and backgrounds
Resize images to any dimension with multiple output formats
Convert images to Base64 encoding and vice versa with real-time preview
Convert images between PNG, JPG, and WebP formats with quality control
Create image collages with drag-and-drop, snap-to-edges, and collision detection
Remove noise from images using advanced algorithms like Gaussian, Median, Bilateral and NLM filtering
View and analyze EXIF metadata from images including camera settings, location data, and timestamps
Remove EXIF metadata from images to protect privacy and reduce file size
Add text or image watermarks to photos with customizable position, size, opacity and more
Extract and analyze colors from any image with click-to-pick functionality
Rotate images to any angle or flip horizontally/vertically with real-time preview
Convert images to ASCII character art with color inversion and adjustable density
Combine multiple images and text blocks into long vertical images for social media and tutorials
Detect display color space support
Test display brightness uniformity and backlight issues
Detect dead, stuck, or hot pixels on your display
Test display contrast, sharpness, and edge clarity
Detect color transition and banding issues
Click to start testing your reaction speed
Professional FPS shooting training with aim, tracking, and flick shot modes
Detect display refresh rate (60Hz/120Hz/144Hz etc.)
Detect screen resolution, DPI, pixel ratio and scaling
Test webcam quality, resolution and frame rate
Test left/right channels, surround sound and audio frequencies
Test multi-touch functionality and touch sensitivity
Convert text to various case formats, supports camelCase, snake_case, kebab-case and more
Powerful text find and replace tool with regex support, case-sensitive and whole word matching options
Generate Lorem Ipsum placeholder text by paragraphs, sentences, or words
Real-time Markdown preview with support for common Markdown syntax
Quickly remove duplicate lines from text with case-sensitive and order-preserving options
Compare two texts and highlight added, removed, and modified content
Count characters, words, lines, paragraphs and sentences in your text
Visualize common mathematical functions used in graphics programming with adjustable parameters
Interactive 3D visualization comparing RGBA and NV12 pixel memory layouts
Visualize YUV color space and NV12 4:2:0 chroma subsampling with memory layout
Query domain name DNS records and IP addresses in real-time
Create and test cron expressions with presets, custom expressions and next run prediction
Minify HTML code, remove comments and whitespace
Minify JavaScript code (Terser), reduce file size
Minify CSS code (clean-css), optimize loading
Fetch website favicons in multiple sizes using Google's API
Test and validate regular expressions with real-time matching and highlighting