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All the Tools That Fit the Web.

93 free online tools for developers. Encoding, PDF manipulation, image processing, cryptography, and more. Everything runs in your browser — no upload, no tracking.

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Developer

21 tools
Base64 Encode/Decode
Encode/decode Base64 text with UTF-8 support
URL Encode/Decode
Percent-encode or decode a URL
HTML Entity Encode/Decode
Escape/unescape HTML entities
Unicode Escape
Escape/unescape \\uXXXX sequences
Hex ↔ Text
Convert between text and hex
Binary ↔ Text
Convert between text and binary
ROT13 / Caesar Cipher
Shift letters with ROT13 or custom Caesar
Hash Generator
MD5, SHA-1, SHA-256, SHA-512
HMAC Generator
HMAC-SHA256/512 with secret key
JWT Decoder
Decode JWT header & payload
JSON Formatter/Validator
Pretty print, minify, validate JSON
JSON ↔ YAML
Convert between JSON and YAML
JSON ↔ CSV
Convert JSON arrays to CSV and back
JSON Diff
Compare two JSON documents
Code Formatter
Pretty-print HTML, CSS, JSON, JS
SQL Formatter
Pretty-print SQL queries
XML Formatter/Validator
Format and validate XML
Regex Tester
Test regex with flags and match list
Cron Expression Parser
Explain cron expressions in plain English
Timestamp Converter
Unix ↔ ISO ↔ relative time
Color Converter
HEX, RGB, HSL, CMYK conversion

Text & String

13 tools
Case Converter
camelCase, snake_case, kebab-case, more
Text Diff
Compare two texts side by side
Text Counter
Words, chars, lines, sentences
Markdown Preview
Live markdown to HTML preview
Lorem Ipsum Generator
Generate placeholder text
Random String Generator
Random strings with custom charset
Slug Generator
URL-friendly slugs from text
Line Tools
Sort, unique, reverse, shuffle lines
Whitespace Stripper
Remove extra whitespace & blank lines
Unicode Inspector
Codepoint, name, category per char
Paragraph Parser
Split, count, reorder paragraphs
Base64 URL-safe
Base64 with URL-safe alphabet
Number to Words
Convert numbers to English words

Crypto & Security

9 tools
Password Generator
Strong random passwords
Password Strength Checker
Score passwords with zxcvbn
UUID / Random Hex
Generate UUID v4 & random hex
bcrypt Hash/Verify
Hash & verify with cost factor
AES-256 Encrypt/Decrypt
Password-based AES via Web Crypto
Vigenère Cipher
Encrypt/decrypt with keyword
Password Entropy
Estimate entropy of a password
Hash Crack-Time Estimator
Estimate brute-force time
Token Detector
Find API keys & secrets in text

PDF

16 tools
Merge PDF
Combine multiple PDFs
Split PDF
Extract page ranges (1-3,5)
Extract Pages
Copy selected pages to new PDF
Delete Pages
Remove pages by range
Reorder Pages
Drag thumbnails to reorder
Rotate PDF
Rotate all pages 90/180/270
Compress PDF
Repack & reduce file size
Protect PDF
Password-protect a PDF
Unlock PDF
Remove password (if known)
PDF Watermark
Add text watermark to pages
Page Numbers
Add page numbers to PDF
PDF → Text
Extract text from PDF
PDF → Images
Render pages as PNG/JPEG
Image → PDF
Convert images to a PDF
PDF Metadata
View & edit title/author
Page Size Converter
A4/Letter/custom page size

Image

16 tools
Image Converter
PNG/JPEG/WebP/AVIF convert
Image Resizer
Resize with aspect lock
Image Compressor
Compress with quality slider
Image Cropper
Crop to custom dimensions
Rotate / Flip
Rotate 90/180/270, mirror
Image Filters
Grayscale, sepia, blur, brightness
Favicon Generator
Image to multi-size ICO/PNG
Background Eraser
AI remove background (rembg)
Image to Base64
Data URL from an image
Base64 to Image
Render & download from data URL
EXIF Viewer
Read & strip EXIF metadata
ASCII Art Converter
Image to ASCII art
Dominant Color
Extract top colors from image
Color Picker
Pick colors from image
SVG to PNG
Render SVG to PNG/JPEG
Thumbnail Grid
Generate multiple thumbnail sizes

Network & Web

10 tools
QR Code Generator
Generate QR codes from text/URL
Barcode Generator
EAN, Code128, UPC barcodes
URL Parser
Break down URL components
Query String Builder
Build/parse query strings
User-Agent Parser
Identify browser, OS, device
HTTP Status Codes
Reference all status codes
CIDR Calculator
Network, broadcast, hosts
DNS Lookup
A/AAAA/MX/TXT/NS records
Redirect Checker
Trace HTTP redirects
Port Reference
Common port numbers table

Math & Unit

8 tools
Base Converter
Bin/oct/dec/hex with BigInt
Roman Numerals
Convert to/from Roman
Percentage Calculator
Increase, decrease, share
Byte Calculator
KB/MB/GB decimal & binary
Unit Converter
Length, weight, temp, data, more
Prime Factorization
Factors, primality, divisors
Random Number
Random numbers with options
Temperature Converter
Celsius, Fahrenheit, Kelvin