Custom QR Code Generator & Stylist
Create high-resolution vector QR codes for URLs, Wi-Fi networks, and contact vCards.
Open Tool →
Generator Hub · 100% In-Browser Execution
QR & Generator Tools Hub
Produce cryptographic hashes, randomized passwords, unique identifiers, mock data records, and customized QR barcodes entirely in your browser. With client-side OCR recognition and RSA key synthesis, your sensitive credentials and images never touch external servers.
Tools Grouped by User Purpose & Intent
Showing all tools in this category (8)
1. Barcodes, QR Codes & Visual Text Recognition
Generate downloadable vector QR codes for websites, WiFi networks, and vCards, or extract text from images and screenshots using in-browser OCR.
Client-Side Optical Character Recognition (OCR)
Extract selectable text from photographed documents, receipts, and scans locally in your browser.
Open Tool →
2. Passwords, Tokens, Hashes & Cryptographic Keys
Generate uncrackable passwords using CSPRNG, produce UUID v4 identifiers in bulk, compute MD5/SHA-256 hashes, and create RSA-2048/4096 public/private key pairs.
Cryptographically Secure Password Generator
Generate high-entropy, cryptographically secure random passwords using browser Web Crypto APIs.
Open Tool →
UUID / GUID v4 Bulk Generator
Generate cryptographically secure RFC 4122 v4 UUID identifiers in bulk.
Open Tool →
Cryptographic Hash Generator
Compute SHA-1, SHA-256, and SHA-512 cryptographic hashes via native Web Crypto.
Open Tool →
RSA Key Pair Generator
Generate client-side PKCS#8 (Private) and SPKI (Public) PEM keys (1024, 2048, 4096-bit) via Web Crypto.
Open Tool →
3. Test Data Generation & Random Selection
Synthesize synthetic mock datasets (names, addresses, realistic JSON tables) and draw unbiased random selections from custom item lists.
Mock Data & Fake JSON Record Generator
Generate realistic dummy records, names, emails, addresses, and UUIDs for API testing.
Open Tool →
Random Item & Giveaway Name Picker
Select fair, unbiased random winners from lists of names, contest entries, or decisions.
Open Tool →
Quick Selection Guide: Which Tool Do You Need?
Create custom branded QR codes with colors and logos for websites or menus
Vector SVG/PNG downloads with customizable error correction levels.
QR Code Generator →Generate uncrackable, complex passwords for new accounts
Uses browser Web Crypto CSPRNG with custom length and symbol sets.
Password Generator →Create hundreds of unique UUID v4 strings for database keys or mock fixtures
Instant batch generation up to 1,000 UUIDs with zero latency.
UUID Generator →Compute SHA-256 or MD5 integrity checksums for sensitive strings
Cryptographic hashing executed synchronously in device memory.
Hash Generator →Synthesize synthetic datasets (names, emails, dates) for API prototypes
Export customizable mock records as structured JSON or CSV arrays.
Mock Data Generator →Draw random winners, lottery names, or decisions from a list
Cryptographically fair random selection with duplicate protection.
Random Picker →Generate public and private RSA key pairs for SSH or asymmetric encryption
Synthesizes PEM-formatted 2048-bit or 4096-bit keys entirely client-side.
RSA Key Generator →Extract text from scanned invoices or photos without sending files to cloud APIs
Runs Tesseract.js engine locally in WebAssembly with zero data leakage.
Offline OCR →Real Technical Limitations & Browser Constraints
Web Crypto CSPRNG Availability
Cryptographic random number generation requires browser environments supporting window.crypto.getRandomValues(). In insecure HTTP contexts, some browsers restrict subtle crypto primitives.
Offline OCR Engine Size & WebAssembly
Tesseract.js OCR downloads optical model files into browser IndexedDB on first run. Recognition speed directly correlates with device CPU cores.
RSA Key Generation CPU Intensity
Generating large 4096-bit RSA keys requires intensive prime factor searches in client Web Workers and may take several seconds on mobile devices.
Related Practical Guides
All Related Practical Guides →
QR & Generator Tools Hub
•
~5 min read
Why Your QR Code Won't Scan: Screen and Print Troubleshooting Guide
Fix QR code scanning failures on screens and printed media. Understand quiet zone margins, contrast ratios, version data density, logo error correction, and distance rules.
Read Guide →Explore Other Category Hubs
View all categories →
15 tools
PDF & Document Tools Hub
Free client-side PDF tools to merge, split, compress, protect, and organize documents directly in your browser. Complete selection guide, technical limits and workflows.
30 tools
Image & Graphic Design Tools Hub
Client-side image tools to compress, resize, crop, convert, and optimize images privately in your browser. Format guides, technical limits, and workflows.
28 tools
Audio & Video Tools Hub
Free in-browser audio and video tools: convert video to MP3, trim sound files, cut clips, screen record, remove silence, and edit ID3 tags without server uploads.
10 tools
Text Tools & String Utilities Hub
Free client-side text tools: count words, convert letter case, clean duplicate lines, compare text diffs, format markdown, and convert HTML entities without server logging.
33 tools
Developer Tools & Code Utilities Hub
Fast, client-side developer utilities: JSON formatter, Base64, SQL, RegEx, JWT, Diff, Cron, and crypto tools. Zero server transmission.
22 tools
Finance & Investment Calculators Hub
Free client-side financial calculators: plan loan repayments, mortgage amortization schedules, compound interest growth, FIRE retirement, inflation adjustments, and currency conversions.
19 tools
Business & Freelance Tools Hub
Free client-side business tools: generate printable invoices, calculate gross margins and VAT, estimate freelance hourly rates, analyze ad ROAS, and track SaaS metrics.
12 tools
Health & Daily Living Tools Hub
Free client-side wellness and daily living tools: calculate BMR, TDEE energy needs, body fat percentage, 90-minute REM sleep cycles, water intake, and fasting schedules privately.
11 tools
Units, Date & Time Calculators Hub
Free client-side measurement and time tools: convert metric and imperial units, calculate date spans, track Schengen 90/180 visa days, compare international clothing sizes, and view world timezones.