Custom tools
Praha, CZ

21 tools · free

Free tools.

A set of free tools for businesses and websites: QR codes including Czech QR payments, an invoice generator, ARES company lookup, VAT number validation, a website audit, an AI-visibility check, robots.txt, sitemap and schema generators, and an automation savings calculator. No sign-up and no tracking; most of them run only in your browser.

Plan & estimate01

Plan a project

ROI · payback

Business automation ROI calculator

Work out what manual work costs you and what automation saves: hours × hourly cost × repetition. Monthly, yearly, payback and the 3-year net benefit.

SEO & AI search08

Get found on Google, Seznam and in AI answers

SEO · technical · security

Free website audit

A free website audit in 20 seconds: titles, headings, canonical, hreflang, robots.txt, sitemap, schema, HTTPS, security headers, images and llms.txt.

GEO · llms.txt

AI visibility checker (GEO) and llms.txt

Can ChatGPT, Claude, Perplexity and Google AI read and cite your site? Checks AI crawlers, llms.txt, schema and answer-first text. Plus an llms.txt draft.

AI crawlers · Seznam

robots.txt generator with AI crawlers (GPTBot)

Create robots.txt with presets for AI crawlers: allow search, block training, or block all AI. Includes SeznamBot and a path tester.

Google · Bing · Seznam

sitemap.xml generator from a list of URLs

Create sitemap.xml from a list of URLs: checks full addresses, duplicates and domains, adds the last-modified date. For Google, Bing and Seznam. Free.

Google · Seznam · sharing

SERP preview and meta tag generator

See how your title and description appear on Google (desktop and mobile), Seznam and when shared. Pixel width, length checks and ready meta tags.

Schema.org · 8 types

JSON-LD structured data generator (schema)

Create JSON-LD structured data for a local business, organization, FAQ, product, article, event, service or how-to. Required-field checks, ready code.

Multilingual sites

hreflang tag generator for multilingual sites

Create hreflang tags and a sitemap fragment for your site's language versions, including x-default. Checks language codes, full URLs and duplicates.

Campaigns · analytics

UTM builder

Create links with UTM parameters for newsletters, social media, ads and print. Keeps existing parameters, normalises naming and handles bulk lists.

Czech business07

Invoices, IČO, payments

QR payment · Wi‑Fi · vCard

Free QR code generator, incl. Czech QR payment

Free QR codes without sign-up: link, Wi-Fi, vCard, email, SMS, Czech QR payment (SPD) and Google reviews. PNG, SVG and PDF, custom colours and logo.

IČO · VAT ID · address

ARES

Look up a Czech company in the ARES register by IČO or name: registered name, address, VAT ID, legal form, founding date. IČO checksum and invoice copy.

CZ · EU · VIES

EU VAT number validator (VIES) and Czech DIČ

Validate Czech DIČ and EU VAT numbers: format, checksum and validity in the EU VIES system. Tells company and individual DIČ apart. For intra-EU invoicing.

PDF · QR payment · ARES

Czech invoice generator with QR payment (PDF)

Free Czech invoices, no sign-up: VAT payer, non-payer, reverse charge, VAT recap, Czech QR payment and company data from ARES. PDF made in your browser.

JSON‑LD · table · text

Opening hours for your website and Google (schema)

Create opening hours as JSON-LD structured data, a clear table for your website and text for profiles. Lunch breaks, holidays and exceptions.

Link · QR · card

Google review link and QR code + table card

Create a direct link to leave a Google review, a QR code and a printable table card. More reviews without paying for them and without breaking the rules.

Template · not legal advice

Privacy policy template generator (GDPR)

Build a privacy and cookie policy template based on what your website really does: contact form, newsletter, e-shop, analytics. Not legal advice.

Content & text02

Write and publish faster

Characters · words · readability

Word and character counter with readability

Count words, characters with and without spaces, sentences, standard pages and reading time. LIX readability index and top words. Works with diacritics.

Clean URLs

Slug generator

Turn article and product titles into clean URL slugs: no diacritics, lowercase, hyphens. In bulk, for Czech, Polish, German and other languages.

Web & dev03

Small jobs for your website

WebP · AVIF · local

Free image compressor to WebP and AVIF

Shrink photos for the web: convert to WebP or AVIF, set quality and max width, batch process and download a ZIP. Images never leave your browser.

ICO · PNG · manifest

Favicon generator

Create a full favicon set from an image or a letter: favicon.ico, PNG icons, apple-touch-icon, maskable icon, web manifest and HTML. Free ZIP download.

Web Crypto · local

Strong password generator, free and private

Create a strong random password right in your browser: length, upper and lowercase, digits, symbols, no look-alike characters. Nothing is sent or stored.

How I pick the tools

I build tools for jobs that Czech businesses do often and that lack a good free tool: the Czech QR payment standard of the Czech Banking Association, invoices with a QR code, the ARES company register, or checking a website for Seznam and AI search engines.

Where possible I build on proven open-source libraries under MIT or Apache 2.0 licences. Each tool page lists what it builds on.

When you need more

Each tool solves one thing. When you need more, for example an invoice that issues itself from an e-shop order, that is a job for a custom tool.

FAQ03

Questions people ask

01Are the tools really free?

Yes, no sign-up and no usage limit. Only the website audit and ARES lookup have abuse protection (a few dozen requests an hour).

02Do you store what I enter?

No. Most tools run entirely in your browser and send nothing anywhere. The exceptions are the website audit, AI visibility, ARES and VAT validation, which have to fetch data from the internet. I store nothing there either.

03Why are the tools free?

Because they are useful and show what I can build. If you need something bigger, you can have a custom tool built.

Next step02