Developer Tools That Just Work
Free, fast, and secure online tools for developers. All processing happens in your browser.
Lightning Fast
All tools run locally in your browser with zero latency
Privacy First
Your data never leaves your device - no server processing
Always Free
No subscriptions, no limits. Just tools.
Encoding
Base64 Encode/Decode
Encode text to Base64 or decode Base64 to text with multiple encoding support
BaseX Encode/Decode
Encode and decode with Base16, Base32, Base58, Base62, Base64, Base85, Base91 and custom alphabets
Text Codec
Convert text to binary/octal/decimal/hex bytes or decode bytes to text with multiple encoding support
Garbled Text Fixer
Fix garbled/mojibake text by trying all encoding combinations automatically
URL Encode/Decode
Encode text for URL or decode URL-encoded strings with multiple encoding modes
Punycode Encode/Decode
Convert international domain names (IDN) between Unicode and ASCII-compatible encoding
Unicode Encode/Decode
Convert text to Unicode escape sequences and decode various Unicode formats
Character Encoding Table
Browse and search ASCII, GB2312, and Unicode character tables
Quoted-Printable Encode/Decode
Encode and decode Quoted-Printable format used in MIME email content transfer
Signed/Unsigned Array Converter
Convert between signed and unsigned integers array with custom bit width (8/16/32/64-bit)
File to Hex/Base64
Convert file to Hex string or Base64 string for embedding
Hex/Base64 to File
Convert Hex string or Base64 string back to binary file and download
Code Runner
JavaScript Runner
Run JavaScript code online with syntax highlighting and basic completion
JavaScript REPL
Interactive JavaScript runtime environment, execute code instantly and see results
Python Runner
Run Python code online with Pyodide, a pure frontend Python interpreter
Python REPL
Interactive Python runtime environment, execute code instantly and see results
C/C++ Code Runner
Run C/C++ code online, no compiler installation required
PHP Code Runner
Run PHP code online, no installation required
Lua Code Runner
Run Lua code online, no installation required
HTML Preview
Preview HTML code online in a new window
SVG Preview
Preview SVG images online in a new window
Code Formatter
Code Minifier
Image
Image/Base64 Converter
Convert image to Base64 data URL or Base64 data URL back to image
Image Format Converter
Convert images between different formats (PNG, JPEG, WebP, GIF, etc.)
Image Compressor
Compress images to reduce file size while maintaining quality
Video Format Converter
Convert videos between different formats (MP4, AVI, MKV, etc.)
Audio Format Converter
Convert audio files between different formats (MP3, WAV, FLAC, etc.)
Color Code Converter
Convert colors between HEX, RGB, RGBA, HSL, HSLA, HSV, HSVA, CMYK, CMYKA formats in real-time
QR Code Scanner
Scan and decode QR codes from images
Barcode Scanner
Scan and decode barcodes from images
QR Code Generator
Generate custom QR codes with colors, logo and various configurations
Barcode Generator
Generate various barcode formats with custom colors and sizes
Crypto
Hash Calculator
Calculate MD5, SHA-1, SHA-256, SHA-512 and other hash values
File Hash
Calculate hash values for local files
HMAC Calculator
Calculate HMAC authentication codes with various hash algorithms
RSA Encryption/Decryption
RSA public key encryption and private key decryption tool
SM2 Encryption/Decryption
Chinese national cryptographic algorithm SM2 elliptic curve encryption tool
AES Encryption/Decryption
Advanced Encryption Standard (AES) symmetric encryption tool
SM4 Encryption/Decryption
Chinese national cryptographic algorithm SM4 symmetric encryption tool
DES Encryption/Decryption
DES/3DES symmetric encryption algorithm tool
SSL Certificate Converter
Convert SSL certificates between PEM, DER, PFX, P7B, JKS formats
SSL Certificate Parser
Parse SSL certificate file or content to view detailed certificate information
Self-Signed Certificate Generator
Generate self-signed SSL certificates and private keys
More tools coming soon...