Krawly.io is a free online platform that provides 160+ web scraping, SEO analysis, security auditing, and developer tools. It allows users to extract data from websites, analyze SEO performance, check security headers, detect technologies, scrape YouTube data, generate leads, and much more — all without requiring signup or installation.

Is Krawly free to use?

Yes! Krawly is completely free. You get 30 free uses per day without signing up. No credit card required.

Do I need to install anything?

No installation needed. All 160+ tools run directly in your browser with no downloads or setup required. There is also a REST API and a Chrome extension for advanced users.

What data formats can I export?

All tools support JSON, CSV, and Excel (XLS) export. The screenshot tool provides PNG images. API responses are in JSON format.

How does the Krawly API work?

Krawly is a free web-based platform. All 160+ tools are available directly in your browser with no signup required. You get 30 free uses per day.

What types of tools does Krawly offer?

Krawly offers tools in 11 categories: SEO (meta tag validator, heading analyzer, keyword density, core web vitals), Web Scraping (email scraper, table extractor, CSS selector scraper), Security (SSL checker, port scanner, WordPress scanner), OSINT (DNS lookup, WHOIS, IP geolocation), E-Commerce (Amazon scraper, Shopify scraper, price tracker), YouTube (comments scraper, playlist extractor, thumbnail downloader), Developer (JSON formatter, regex tester, JWT decoder), Content (word counter, readability score), Analysis (technology detector, page speed analyzer), Social Media (TikTok analyzer, Instagram analyzer), and Utilities (QR code generator, URL shortener).

Is Krawly a good alternative to SEMrush, Ahrefs, or BuiltWith?

Krawly provides many of the same on-page SEO analysis features as SEMrush and Ahrefs for free, including meta tag validation, heading analysis, keyword density checking, and structured data auditing. For technology detection, it serves as a free alternative to BuiltWith and Wappalyzer. However, Krawly focuses on individual page analysis rather than domain-wide crawling or backlink databases.

Can I use Krawly for lead generation?

Yes. Krawly's Lead Generation tool automatically crawls a website's homepage, about, contact, and team pages to extract email addresses, phone numbers, LinkedIn profiles, Twitter handles, Facebook pages, Instagram accounts, and GitHub links. Results can be exported as JSON, CSV, or Excel.

Image Free · no signup

Image Resizer

Resize images to custom dimensions with aspect ratio preservation.

Updated May 24, 2026

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What is Image Resizer?

The Image Resizer is a free online tool that resizes images to custom dimensions. Set width, height, or both — with optional aspect ratio preservation. Perfect for preparing images for websites, social media, or print.

Use cases

Social media — resize images to platform-specific dimensions
Website — resize images for thumbnails, banners, and hero images
Email — resize images to fit email templates
Print — resize images to specific DPI and dimensions
Batch preparation — resize images to consistent dimensions

Key features

Custom width and height input in pixels

Aspect ratio preservation toggle

High-quality LANCZOS resampling algorithm

Shows original and new dimensions

Supports all common image formats

Instant download of resized image

Frequently asked questions

When enabled, the image proportions are maintained. If you set only width, height is calculated automatically (and vice versa). If both are set, the image fits within that box.

Upscaling (making images larger) may reduce sharpness. Downscaling generally preserves quality well with the LANCZOS algorithm.

You can upload images up to 10MB and 8000×8000 pixels.