Free Web Tools
A directory of free online tools built by Hashito System Inc. Generate and analyze QR codes, create barcodes, check your browser information, clean up images, and visualize sorting algorithms, all with no install required and right in your browser.
QR Code Analyzer
Upload a QR code to analyze and display detailed information such as its error-correction level, version, and mask pattern.
QR Code EC Tester
Visually test the limits of each error-correction level by masking parts of a QR code to find its readable boundary.
Sort Image Visualizer
Upload an image and experience sorting algorithms in motion through sight and sound. Supports 8 different algorithms.
PixelPurge
A free tool that merges fine color speckles and noise in AI-generated images into solid regions. It runs entirely in your browser, so your images are never uploaded.
Browser Info Viewer
A free tool that shows your browser type and version, screen/window size, IP, language, time zone, GPU, and more, all on one screen.
QR Code Generator
Generate QR codes from URLs or text. Fine-tune the error-correction level, version, size, margin, and color, then download as PNG or SVG.
Barcode Generator
Generate CODE128, EAN/JAN, UPC, CODE39, and other barcodes. Set bar width, height, color, and margin, then download as PNG or SVG.
Subnet Calculator
From an IPv4 address and CIDR/mask, compute the network, broadcast, host range, and host count.
Character Counter
Paste text to instantly count characters (with/without spaces), words, lines, and bytes.
Password Generator
Generate strong random passwords with a secure RNG; choose length and character types, then copy.
Base64 Encode / Decode
Convert text to and from Base64. UTF-8 safe (Japanese, emoji) with optional URL-safe output.
JSON Formatter & Validator
Paste JSON to pretty-print or minify. Syntax errors are reported with line and column.
UUID Generator
Generate v4 UUIDs in bulk with a secure RNG. Options for uppercase, no hyphens, and braces.
Color Code Converter
Convert between HEX, RGB and HSL with a large live preview. Copy any notation in one click.
URL Encode / Decode
Percent-encode and decode text for URLs — safe for Japanese and symbols.
Unix Time Converter
Convert between Unix timestamps and dates: seconds/ms, time zone and ISO 8601.
Hash Generator (SHA)
Compute SHA-1/256/384/512 hashes from text in the browser via Web Crypto.
Text Diff
Compare two texts and highlight added and removed lines.
JWT Decoder
Decode a JWT's header and payload and pretty-print claims like exp.
HTML Escape / Unescape
Convert <, >, &, ", ' to and from HTML entities — handy for posting code.
Case Converter
Convert text between camelCase, snake_case, kebab-case and more.
Number Base Converter
Convert between binary, octal, decimal and hex — accurate via BigInt.
Lorem Ipsum Generator
Generate Lorem ipsum placeholder text by paragraphs, sentences or words.
Regex Tester
Test a regex against sample text with live match and group highlighting.
CSV ⇄ JSON Converter
Convert between CSV and a JSON array, with header and delimiter options.
Line Tools
Sort lines, remove duplicates, drop blank lines and trim whitespace.
Slug Generator
Create URL-friendly slugs (hello-world) from text, with accent removal and separator options.
Image to Base64 (Data URL)
Convert an image to a Data URL and get HTML/CSS embed snippets. Everything runs in your browser.