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DNS, email, ports, SSL, WHOIS and 30+ more tools — all in one place. Free web interface and powerful REST API.
11 tools in Images & Media
Image Converter & Compressor
Convert and compress images online — PNG to JPG, WebP to JPG, HEIC to JPG, AVIF, TIFF. Quality control, resize, batch processing up to 10 files. No upload to third-party servers.
Image Resizer
Resize images online to exact dimensions with aspect ratio control. Free image resizer — choose fit mode: cover, contain, fill, inside, or outside.
Image Cropper
Crop images to custom dimensions by specifying coordinates. Precise pixel-level control for cutting images to the exact size you need.
Watermark Tool
Add text or image watermarks to images with customizable position, opacity, and style. Batch processing up to 10 files with 9 placement options.
EXIF Viewer
View image metadata — camera model, resolution, GPS coordinates, date taken, ISO, shutter speed, and color channel statistics.
Image to Base64
Encode any image to Base64 data URL for embedding in CSS and HTML. Get ready-to-use code snippets for background-image and img tags.
Placeholder Generator
Generate placeholder images with custom dimensions, background color, text, and format. Perfect for mockups, wireframes, and prototypes.
Color Palette Extractor
Extract dominant colors from any image using K-means clustering. Get HEX, RGB, and HSL values with ready-to-use CSS variables.
Blur & Pixelate
Apply Gaussian blur or pixelation effect to images. Adjust intensity with a slider for privacy masking or artistic effects.
Rotate & Flip
Rotate images by 90, 180, 270 degrees or any custom angle. Flip horizontally or vertically. Combine rotation with mirroring.
Web Optimizer
Auto-optimize images for the web — resize to max 2000px, convert to WebP format, and compress with optimal quality settings.
Browse Tools by Category
DNS & Domain Tools (6)
Check DNS records, monitor propagation, perform reverse DNS lookups, query WHOIS data, and verify nameserver configurations for any domain worldwide.
Email & Deliverability Tools (8)
Validate MX records, check SPF/DKIM/DMARC policies, scan IP blacklists, analyze email headers, and run full email health diagnostics to fix deliverability issues.
Network & IP Tools (9)
Scan open ports, run ping and traceroute tests, geolocate IP addresses, look up ASN information, calculate subnets, and check your public IP — all from your browser.
Web & Security Tools (6)
Verify SSL/TLS certificates, inspect HTTP security headers, measure page load speed, detect web technologies, generate security scores, and check robots.txt configurations.
Images & Media Tools (11)
Convert between PNG, JPEG, WebP, and AVIF formats. Resize, crop, optimize, add watermarks, extract EXIF metadata, generate color palettes, and create placeholder images.
Text Tools Tools (7)
Analyze text readability and word count, check content for water words, calculate keyword density, convert letter case, compare text differences, and test regular expressions.
Utilities Tools (6)
Encode and decode Base64 and URLs, generate MD5/SHA hashes, format and validate JSON, create strong passwords, and generate UUIDs — essential developer utilities.
Free Network Diagnostic & Developer Tools Online
NetVizor provides a comprehensive suite of 53+ free online tools for network diagnostics, domain analysis, email troubleshooting, web security auditing, image processing, and developer utilities. Every tool works directly in your browser — no installation, no registration for basic use, and no ads.
DNS & Domain Tools: Our DNS lookup tool lets you query all record types (A, AAAA, MX, CNAME, TXT, NS, SOA) for any domain. Track DNS propagation across global resolvers after making changes. Perform reverse DNS lookups to find hostnames associated with IP addresses. Run WHOIS queries to discover domain ownership, registration dates, and registrar information. Check domain age and verify nameserver configurations — essential for domain research, migration planning, and troubleshooting DNS issues.
Email Diagnostics: Identify why emails bounce or land in spam. Check MX records to verify mail server configurations. Validate SPF records to prevent spoofing. Verify DKIM signatures to ensure email authenticity. Analyze DMARC policies for proper email security. Scan your domain or IP against 50+ DNS-based blacklists (Spamhaus, Barracuda, SORBS). Parse raw email headers to trace delivery paths. Our email health tool combines all checks into a single report card.
Network & Security: Scan open ports on any server to discover running services — check SSH (22), HTTP (80), HTTPS (443), SMTP (25), or custom port ranges. Measure server response time with ping. Trace routing paths with traceroute to identify network bottlenecks. Geolocate any IP address to find its country, city, ISP, and ASN. Verify SSL/TLS certificates and check expiration dates. Inspect HTTP response headers for security misconfigurations. Detect technologies powering any website.
REST API: All tools are available programmatically via our REST API. Get a free API key with 1,000 requests per month. Use it to automate SSL monitoring, DNS validation, port scanning, email health checks, and more in your scripts, CI/CD pipelines, or monitoring dashboards. Paid plans support up to 100,000 requests per month with higher rate limits and bulk endpoints.