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Analyse · Optimise · Understand

Your website.
Clearly in view.

Free tools for better websites.

Free · No sign-up · No stored analysis data

Over 60 checksPractical toolsClear, practical guides
https://example.com
Seitensicht AnalysisSample report
78out of 100

A solid foundation

Your website has a solid technical foundation, with a few opportunities for improvement.

Technology86 / 100
Content72 / 100
Metadata68 / 100
Performance91 / 100
Mobile friendliness84 / 100

Our tools

Tools for your website

View all tools

SEO-Check

Check metadata, content and technical details live, with specific suggestions for improvement.

Check a sitemap

Find structural errors and unreachable URLs to keep your sitemap tidy.

SERP preview

Preview your title and description in search results and check their width.

All tools at a glance

All free, with no sign-up. File tools run in your browser; your files are never uploaded.

Check and compare

See what is really happening on your website.

Two website maps are next to each other, their test reports can be compared directly.

URL comparison

Compare two pages side by side: scores, key metrics and every individual check.

Open tool A search card and the corresponding content components of a website are connected by a magnifying glass.

Google ranking check

How well does a page target a search term? Check titles, headings, body text, link text and technical requirements.

Open tool A highlighted website map is compared to several other maps and their metrics.

Competition analysis

Compare your website with the ten results ahead of it and see what the leading pages do differently.

Open tool From a homepage, connections branch to bottom pages; a faulty page is highlighted.

Website crawler

Follow internal links and check up to 100 pages for errors, duplicate titles and thin content.

Open tool A website bot faces two paths: one path is released, the other blocked by a barrier.

Test robots.txt

Paste rules and enter URLs to see which pages are blocked and which rule applies.

Open tool An overview of connected website pages is checked with a magnifying glass for missing and incorrect entries.

Check a sitemap

Parse XML, find structural errors and check whether the listed URLs are reachable.

Open tool

PDF and JSON

Print any report as a PDF or retrieve machine-readable results through the JSON API.

Open tool

For search engines

Help search engines find your content.

A website map creates a box with icon, page data and website files.

Website launch package

Fill in one form to create meta tags, Open Graph, schema markup, a favicon, robots.txt and a sitemap in one package.

Open tool The title, description and preview image of a website are transferred to a source code module.

Create meta tags

Create titles, descriptions and preview images, with a preview of how Google displays the result.

Open tool A search result card is measured with a ruler; an excessively long line of text ends at the visible edge.

SERP preview

Preview your title and description as Google displays them, measured in pixels rather than characters.

Open tool An article, a product and a company are combined into ordered data modules.

Create schema markup

Create JSON-LD structured data for businesses, articles, products and events.

Open tool A rule file controls open and blocked paths of a website bot.

Create robots.txt

Build rules with a few clicks, including restrictions on AI crawlers.

Open tool A stack of individual website addresses becomes an ordered map of connected pages.

Create a sitemap

Paste URLs or scan your website, then download the finished XML file.

Open tool After an audit, website pages are sent as notifications to several search services.

Submit to search engines

Submit new pages directly to Bing, Yandex, Seznam, Naver and other search engines through IndexNow, with checks before submission.

Open tool

Sharing and promotion

Make your links look good wherever they are shared.

A website link unfolds on a smartphone to a map with image, title and description.

Create Open Graph tags

Create preview images and text for WhatsApp, Facebook and LinkedIn, with a preview for each network.

Open tool Links from various campaigns are given color markings and run together in an evaluation diagram.

Create UTM links

Track campaigns and catch mistakes before they appear in your reports.

Open tool A QR display leads from the smartphone directly to a rating card with stars.

Google review link

Link directly to the review form, with a QR code for displays and invoices.

Open tool

Build a website

Build a complete website from a template.

Website building blocks, colors and module positions are assembled into a finished page template.

Joomla template generator

Customise 62 templates by industry and layout, adjust colours and module positions, and download a ready-to-install ZIP for Joomla 4 and 5.

Open tool

Images and icons

Images account for most of the loading time on many websites.

A large photo card and a smaller copy are matched to their dimensions with a ruler.

Resize images

Resize to fixed dimensions or a percentage, and optionally convert to another format.

Open tool A photo card is converted and comes out as a lighter file with the same image content.

Convert images to WebP

Resize and convert multiple images at once in your browser, with no upload.

Open tool A large image motif is transferred into different sized website and smartphone symbols.

Create a favicon

Select an image and create all icon sizes and a web manifest directly in your browser.

Open tool A frame selects the desired square image section from a wide landscape.

Crop an image

Choose a crop freely or with a fixed aspect ratio. Keyboard controls are supported.

Open tool Camera, calendar and location details are solved by a photo card; the photo is preserved.

View and remove EXIF metadata

View camera, date and location metadata, then remove it without losing image quality.

Open tool A vertical slider separates two views of the same landscape into before and after.

Before-and-after slider

Compare two images with a slider and get ready-to-use code without a third-party library.

Open tool A picture creates a fan of matching hues; light and dark text cards show the contrast.

Create a colour palette

Create colour harmonies and shades, extract colours from an image and check contrast against WCAG.

Open tool A picture card is connected to a described text field; an eye and a loudspeaker stand for accessible content.

Write alt text

Choose an image type, check your description and copy the finished markup.

Open tool A content card becomes a QR code on a display that a smartphone scans.

Create a QR code

Create sixteen QR content types with your logo and colours, as PNG, SVG or print-ready PDF.

Open tool

Source code and server

Keep your source code and server configuration tidy.

A densely described source text card is converted into neatly indented, structured lines.

Format HTML

Indent or minify source code in your browser, with no upload.

Open tool Unordered style rules become structured blocks of source text next to a designed website.

Format CSS

Make minified CSS readable again, or minify it for delivery.

Open tool Nested data is represented as an ordered tree; a defective location is marked with a magnifying glass.

Format JSON

Validate, format or minify JSON, with the line, column and exact error location.

Open tool A link chain passes through a translator; its individual components are structured in color.

Encode a URL

Encode or decode URLs and parameters, and inspect their individual components.

Open tool A rule file controls a forwarding, a protected area and the delivery of a website.

Create .htaccess

Configure redirects, HTTPS, compression and access protection for Apache with a few clicks.

Open tool

Required legal information

Essential information for business websites.

A business card, a contact envelope and a building are merged into one website document.

Create a legal notice

Select a legal form and enter your details to create a German legal notice under section 5 DDG.

Open tool

What the SEO check covers

Metadata

  • –Title & length
  • –Meta-Description
  • –Canonical & Robots
  • –Language, charset, viewport
  • –hreflang & Favicon

Content & keywords

  • –Text length & text-to-code ratio
  • –Keyword density (1–3 words)
  • –Placement in title, H1 and URL
  • –Flesch readability
  • –Keyword stuffing warning

Structure

  • –H1 check
  • –Heading hierarchy
  • –Skipped heading levels
  • –Title and H1 comparison

Links

  • –Internal & external links
  • –Broken links
  • –Proportion of nofollow links
  • –Empty anchor text

Images & media

  • –Missing alt text
  • –Actual file sizes
  • –Oversized images
  • –WebP/AVIF instead of JPEG
  • –width/height (CLS)

Legal & privacy

  • –Linked legal notice
  • –Linked privacy policy
  • –Remotely loaded Google Fonts
  • –Third parties and data transfers
  • –Consent banner
  • –YouTube and Maps embeds

Technology

  • –HTTP status & redirect chain
  • –http→https and www versions
  • –404 behaviour
  • –HTML validation (W3C)
  • –Security headers & mixed content
  • –robots.txt & XML Sitemap

Accessibility

  • –Labelled form fields
  • –Link and button names
  • –Page landmarks & skip link
  • –Table headers and iframe titles
  • –Keyboard navigation order
  • –Autoplaying media

Social & Rich Results

  • –Open Graph
  • –Twitter Cards
  • –Schema.org / JSON-LD
  • –Required fields for rich results

Output

  • –Score by category
  • –Google snippet preview
  • –Specific recommendations
  • –JSON-API

Why on-page optimisation comes first

Search engines need to understand a page before they can show it. On-page optimisation helps clarify what the page is about.

These changes are within your control. A missing title or alt text takes five minutes to add. Backlinks take months and depend on other people.

That is why the order matters. Get your own website into shape before working on outreach. Skipping this step hands rankings to competitors who have done it.

A useful starting point is Google’s SEO starter guide .

How the score is calculated

Each check has a weight. A missing title carries more weight than a missing favicon. All checks combine into an average score from 0 to 100.

A pass counts fully, a warning counts half and a failure counts zero. Informational findings do not affect the score, making results comparable.

Three conditions also cap the score. An HTTP error status of 400 or above caps it at 25 points; noindex at 40; and a robots.txt block at 45. A page nobody can find has little value, however good its text is.

Grades range from A at 90 points to F below 50. They are a guide, not a verdict. The list of findings matters more than the number.

Frequently asked questions about the SEO check

What is an on-page check?
An on-page check examines the page itself: its title and description, headings, text, images, links and underlying technology. Rankings and backlinks are outside the page and require other data sources.
Is my data stored?
No. The checked URL and results exist only in memory for the duration of the request. They are then discarded. There are no accounts or analytics tracking. Only your language preference is saved.
How long does a check take?
A page check usually takes one to three seconds. Crawling 25 pages takes around ten seconds, depending on the server. A Google loading-time measurement can take up to one minute.
Why does the score differ from other tools?
Tools use different weights. Here, a missing title matters more than a missing favicon. Indexability problems also cap the score. A page returning a 404 status cannot receive a good score, even if everything else is correct.
What should I do with the results?
Work through the list from top to bottom: red findings first, then yellow ones. Each finding explains the problem and its cause. Run another check afterwards to see what your changes have improved.

Know someone who could use this?

Seitensicht is free to use without an account. A link helps the project most: in a forum, your signature or on your own website.

Banners in four sizes are ready to use, with matching HTML, BBCode and Markdown snippets to copy.

View banners
Example banner of Seitensicht300 by 100 pixels

JSON-API

Every analysis is also available in machine-readable form, for monitoring or reports.

A test report branches into a printable file and ordered data for other applications.

How it works

Take test results with you or process them further

  1. Creating an SEO report
  2. Select PDF printing or JSON API
  3. Save or further process the result
# On-page analysis of a URL
curl "https://seitensicht.de/en/api/analyze?url=https://beispiel.de"

# Crawl up to 100 pages
curl "https://seitensicht.de/en/api/crawl?url=https://beispiel.de&limit=25"

# PageSpeed measurement (Google Lighthouse)
curl "https://seitensicht.de/en/api/pagespeed?url=https://beispiel.de&strategy=mobile"

You can also print any report with “Save as PDF”. The print view expands all details and hides the controls.