Tools
JSON Formatter
Format and validate JSON
UUID Generator
Generate UUID v4 instantly
Password Generator
Generate secure random passwords
Base64 Encode / Decode
Encode and decode text with Base64
Timestamp Converter
Convert between Unix timestamps and dates
Character Counter
Count characters, bytes, lines, and words in real time
URL Encoder / Decoder
Encode and decode text with percent-encoding
Color Code Converter
Convert between HEX, RGB, and HSL
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes
JWT Decoder
Decode JWT tokens and inspect header and payload
QR Code Generator
Generate QR codes from text or URLs and download as PNG
Regex Tester
Test regular expression patterns and inspect match results
Text Case Converter
Convert text to camelCase, snake_case, kebab-case and 5 more
Date Calculator
Calculate date differences, add/subtract days, or compute age
CSV Tools
Preview CSV as table, convert to JSON, download formatted. Auto-detects delimiter
Image Resizer
Resize images in your browser. JPEG, PNG, WebP output. No server upload.
HTML Escape
Escape and unescape HTML special characters (< > & " '). Runs in your browser.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
Text Transformer
Uppercase, lowercase, sort lines, remove duplicates, and more.
Cron Parser
Parse cron expressions into human-readable descriptions with next run times.
Diff Viewer
Compare two texts line by line and visualize differences.
YAML ↔ JSON Converter
Convert between YAML and JSON instantly. Runs in your browser.
Image to Base64
Convert images to Base64-encoded strings. Drag & drop to use.
CSS Gradient Generator
Visually generate linear and radial CSS gradients.
Japanese Era Converter
Convert between Gregorian and Japanese eras (Reiwa, Heisei, Showa…).
Consumption Tax Calculator
Calculate Japanese consumption tax (8% / 10%) from pre- or post-tax amounts.
Lorem Ipsum Generator
Generate Lorem ipsum and Japanese dummy text by paragraph count.
Favicon Generator
Generate favicons (16×16 / 32×32 / 48×48 PNG) from any image.
OG Image Generator
Generate OGP thumbnail images (1200×630px) in your browser.
PDF to Image
Convert each PDF page to PNG images. Runs entirely in your browser.
Split Bill Calculator
Split expenses equally among any number of people
Unit Converter
Convert length, weight, temperature, area, volume, and speed
Japanese Text Formatter
Normalize full-width/half-width, unify punctuation, and clean up Japanese text
IP Address Calculator
Calculate network address, broadcast, and host count from IPv4 CIDR
PDF Text Extractor
Extract text from PDFs in your browser. Copy or download as TXT.
PNG to SVG Converter
Convert PNG/JPG images to SVG vector format in your browser.
CSV Cleaner
Remove duplicates, empty rows, and trim whitespace from CSV files.
Speech to Text
Transcribe audio and video files with Whisper in your browser.
Invoice / Quote Generator
Generate PDF invoices and quotes from a form. Runs in your browser.
Background Remover
Remove image backgrounds with AI in your browser. Outputs transparent PNG.
Hashtag Generator
Automatically generate SNS hashtags from text. Japanese & English.
SRT Subtitle Editor
Adjust SRT subtitle timing (offset & scale) and export.
Barcode Generator
Generate Code128, EAN-13, Code39 barcodes as SVG or PNG.
Furigana Generator
Add furigana readings to kanji and output HTML ruby markup.
Markdown Tools
Live Markdown preview, HTML export, and text statistics.
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A collection of useful web tools including JSON formatter and more