Internet Connection Restored
OnlineYour device is back online! Full network tools (PageSpeed, SSL Checker, Live FX rates) are available again.
Zero Latency
Calculations and conversions run natively via WebAssembly and Web Workers.
100% Private
No data can leak when there is no network connection. Offline is the ultimate privacy guarantee.
PWA Cached
Install SYV Tools to your desktop or mobile home screen for permanent offline utility access.
Available Offline Tools (38)
Click any utility below to launch immediately without an internet connection.
JSON Formatter & Validator
Prettify, minify, sort keys, and validate JSON with line-by-line syntax error diagnostics.
JWT Decoder
Decode JSON Web Token headers and claims with expiry dates without sending tokens anywhere.
Regex Tester
Test regular expressions with real-time match highlighting, capture groups, and ReDoS protection.
Base64 Encoder / Decoder
Encode and decode text and files to standard Base64 and URL-safe Base64 with full UTF-8 support.
UUID Generator
Generate cryptographically secure RFC-4122 v4 UUID identifiers with custom formatting options.
Unix Timestamp Converter
Convert epoch seconds and milliseconds to UTC, local, and IST dates and relative time.
Code Beautifier
Format and beautify HTML, CSS, JavaScript, and SQL source code locally.
Text Diff Checker
Compare two text snippets side-by-side or inline to highlight additions, deletions, and edits.
Cron Expression Generator
Build standard 5-field Unix cron schedules with human-readable descriptions and next run times.
JSON to CSV Converter
Convert JSON arrays to spreadsheet-safe CSV and parse CSV tables back to JSON.
Hash Generator
Generate secure SHA-256 and SHA-512 cryptographic digests using the native Web Crypto API.
cURL Converter
Parse cURL commands into clean JavaScript Fetch or Axios requests without running code.
Image Compressor
Reduce JPEG, PNG, and WebP file sizes in browser workers while preserving visual fidelity.
Image Converter
Convert photos between JPG, PNG, WebP, and AVIF formats entirely on your device.
Image Resizer
Resize and crop pictures to exact pixel dimensions with aspect ratio locking.
Image to PDF
Combine multiple photos into a single clean PDF document with custom margins and page sizes.
Image Watermark
Add text or logo watermarks to your pictures with adjustable opacity and position.
Image Color Picker
Sample exact HEX, RGB, and HSL colors from any uploaded image with pixel-level precision.
Favicon Generator
Generate multi-resolution PNG and ICO web app icons and HTML manifest tags from a logo.
Meta Tag Generator
Craft social Open Graph, Twitter card, and search-optimized HTML meta tag snippets.
Robots.txt Generator
Generate search crawler directives and sitemap declarations for web robots.
Sitemap Generator
Build XML sitemap files from URL lists with proper entity escaping and lastmod tags.
Schema Markup Generator
Generate JSON-LD structured data for Organizations, Persons, Articles, and Products.
GST Calculator
Calculate inclusive and exclusive India GST with CGST, SGST, and IGST breakdowns.
EMI Calculator
Compute monthly loan payments, total interest, and reducing balance amortization schedules.
SIP Calculator
Forecast wealth accumulation and compounding returns from monthly systematic investments.
Salary Calculator
Estimate monthly take-home salary from annual CTC under Indian tax regimes.
Percentage Calculator
Solve everyday percentage calculations, percentage increases, and proportion formulas.
Discount Calculator
Calculate shopping savings, sale prices, and multiple successive discount percentages.
Date Difference Calculator
Calculate exact days, working days, and calendar components between two dates.
Unit Converter
Convert lengths, masses, temperatures, speeds, and data storage units accurately.
Scientific Calculator
Perform mathematical, trigonometric, and logarithmic calculations safely.
QR Code Generator
Create downloadable PNG and SVG QR codes for URLs, text, contact cards, and emails.
QR Code Scanner
Scan QR codes instantly from your webcam or uploaded image files securely in-browser.
Wi-Fi QR Generator
Generate scannable QR codes for guests to connect to Wi-Fi without typing passwords.
Password Generator
Generate cryptographically random passwords with custom lengths and character sets.
Password Strength Checker
Evaluate password entropy, crack times, and pattern vulnerabilities locally in your browser.
Image Metadata Remover
Strip sensitive GPS locations and EXIF tags from photos before sharing online.