64 Free browser tools

All tools

Screen Share

Share your screen instantly with a simple link. No downloads needed - peer-to-peer WebRTC streaming. Perfect for presentations and remote support.

Share screen

TechCall

Free voice, video and screen share calls in your browser. Multi-party rooms with peer-to-peer WebRTC. Invite anyone with a link - no downloads needed.

Start a call

Broker Statements

Upload your DEGIRO transactions CSV and get an instant portfolio dashboard: FIFO realized P&L, open positions, fees & charts. Parsed privately in your browser.

Analyze my portfolio

Czech Data Hub

All the free Czech public registers in one tabbed tool: ARES companies, VAT (VIES), ČNB rates, ID validators (rodné číslo / IČO / IBAN), name-days & holidays, and spot electricity prices. No login.

Open the hub

Business Register (ARES)

Look up any Czech company or sole trader in the official ARES register — by name or IČO. Legal form, VAT status, address, CZ-NACE activities, registers (incl. insolvency) & shareholders. Free, no login.

Search the register

VAT Checker (DPH)

Verify any EU VAT number (DIČ) via the official VIES system + the Czech ARES register. Registered name, address & VAT-payer status. Free, no login.

Verify VAT number

ČNB Exchange Rates

Official Czech National Bank daily exchange rates with a fast CZK converter. 30+ currencies, full rate table, historical rates by date. Free, no login.

Convert currency

Valná hromada

Simulátor valné hromady s.r.o. a a.s. Sestavte program, zadejte hlasy společníků, odhlasujte usnesení a vygenerujte zápis. Výpočty dle ZOK.

Zahájit hlasování

Invoice Creator

Invoice generator for non-VAT payers. Customer management, ARES lookup, QR payment, PDF export. 100% in your browser.

Create invoice

Účetní závěrka

Sestavte účetní závěrku české s.r.o. – rozvaha, výkaz zisku a ztráty a příloha z obratové předvahy dle vyhlášky 500/2002 Sb. Hlídání lhůt, rozdělení zisku (ZOK), napojení na Fakturaci a Valnou hromadu.

Sestavit závěrku

Mail

Fast, private webmail for your @techtools.cz mailbox. Read, compose and send — with one-click switching between company accounts. Self-hosted: your mail stays on our server.

Open your inbox

How AI Works

An epic, interactive journey through how AI really works — the history of AI, machine learning, neural networks and n-grams. Scrub the timeline, train a tiny brain, and watch a model predict the next word. For everybody.

Learn how AI works

RAG & Vectors

Interactive, click-to-learn guide to embeddings, cosine similarity, semantic search and Retrieval-Augmented Generation. Plus LangChain vs LangGraph and pgvector in Rails.

Learn how RAG works

Inside the Terminal

What really happens inside a Linux/Unix terminal — built from a real chat. Decode the w command, meet TTY vs pts, watch the master/slave pair pass your keystrokes, and see how reading /dev/pts/N snoops on (and garbles) a session — plus why permissions stop it.

See how terminals work

Quantization & Local LLMs

How much RAM do you need to run a model? An interactive guide, built from a real chat — work out the memory, watch what Q4 really does to a weight, route a word through mixture-of-experts, and learn what GGUF, BF16 and parameters actually mean.

Work out the RAM

QR Code Generator

Generate QR codes for URLs, text, WiFi credentials, contacts, email, phone, and SMS. Customize colors, download as PNG/SVG, and track scans.

Make a QR code

URL Redirector

Create custom short links with personalized redirect messages. Track clicks and manage your redirects with custom slugs and expiration dates.

Shorten a link

Data Formatter

Format, minify, and validate JSON, XML, YAML, TOML, SQL, and CSV. Convert between formats instantly with syntax validation.

Format JSON

SCAD to STL

Convert OpenSCAD .scad code to a printable STL right in your browser. Renders with the real OpenSCAD engine (WebAssembly), shows a 3D preview, exports STL/OFF/AMF. Nothing is uploaded.

Convert to STL

simpleCAD

A free 2D CAD & drafting tool. Draw precise shapes in real units on a snapping grid, organize with layers, and save named projects locally. One-click starter templates; export to SVG, PNG and DXF. Nothing is uploaded.

Open simpleCAD

simple3D

A free 3D model maker. Drop in boxes, spheres, cylinders and cones, move, rotate, scale and colour them, then export to STL, OBJ or glTF. One-click starter templates — snowman, house, rocket. Nothing is uploaded.

Open simple3D

Favicon Generator

Create favicons from text, images, or emojis. Generate ICO and PNG files in all sizes. Download complete favicon package for your website.

Make a favicon

OCR

Pull selectable, editable text out of photos, screenshots, scans and PDFs — English, Czech and 10+ more languages. Drag, drop or paste; everything runs in your browser and nothing is uploaded.

Extract text

SPZ Reader

Upload a car photo and a purpose-trained plate model on our own server reads the SPZ in about a second - processed in memory, never stored. Plus a keyed HTTP API (deep vision AI, body colour too) for scripts and cameras.

Walking Cat

Add a cute animated cat that walks across your website. Free, dependency-free widget — copy one line of code. Pick the fur and let it stroll or chase the cursor.

Add the cat

Cron Helper

Visual cron expression builder with live validation, human-readable explanation, next run times and a full reference guide.

Build a cron

Investment Calculator

Calculate compound interest, SIP returns, retirement planning, and financial goals. Visualize investment growth with interactive charts.

See your returns

Digital Painting Tool

Professional digital canvas for creative artwork and illustration. Free online painting tool with brushes and colors.

Start drawing

PDF Editor & Annotator

Advanced PDF editor for annotations, text editing, highlighting, and document modification. Free online PDF editing tool.

Edit a PDF

File Format Converter

Convert between image, audio, video, document, and data formats. Support for JPG, PNG, MP3, MP4, PDF, DOCX, CSV, and many more formats.

Convert a file

Floor Plan Editor

Design renovation and reconstruction plans. Draw floor plans with color-coded walls: green for new construction, red for demolition.

Plan a layout

Difference Checker

Compare two texts and highlight additions and deletions at the character level.

Compare texts

File Compressor

Compress multiple files into ZIP archives. Create and download compressed files for easy sharing and storage.

Compress files

Markdown Editor

Write and preview Markdown with live rendering. Split-view editor with syntax highlighting, table support, and export to HTML/PDF.

Write Markdown

Text Editor

Full-featured text editor supporting plain text, Word documents (DOCX), and OpenDocument (ODT) files. Rich text formatting and file conversion.

Edit text

Video Editor

Professional video editing suite with timeline editing, filters, effects, text overlays, and multi-format export. Trim, split, merge, and enhance your videos.

Edit video

Image Editor

Compress, resize, crop, rotate, and convert images. Support for PNG, JPG, WebP, GIF, BMP. Reduce file size while maintaining quality.

Edit an image

CryptoMaster

Advanced encryption and decryption tool supporting multiple algorithms. Hash generation, password encryption, and secure data processing.

Encrypt & hash

Commander & Slave

Master productivity with mind-body separation. Command tasks as the strategic mind, execute them as the disciplined body.

Command tasks

WorkTracker

Log your daily work hours with descriptions. View monthly calendar, generate reports, and export to CSV or PDF.

Track work

Magic Extension

Track your browsing habits with powerful analytics. Monitor time spent, page visits, and domain activity with beautiful charts and insights.

See analytics

AI Chatbot

Chat with an intelligent AI assistant. Get help with questions, coding, writing, explanations, and more. Powered by DeepSeek AI.

Ask the AI

PasteShare

Share screenshots and text instantly! Just Ctrl+V to paste an image or text and get a shareable link. Auto-expiring for privacy.

Paste & share

Microphone Test

Test your microphone online. Check audio levels, visualize waveforms and frequencies, record test clips for playback quality check.

Test mic

Webcam Test

Test your webcam online. Check resolution, frame rate, brightness, and capture photos. Switch cameras and test different resolutions.

Test webcam

Speaker Test

Test speakers and headphones online. Check stereo channels, frequency response from 20Hz to 20kHz, bass test, and audio quality.

Test speakers

Keyboard Test

Test your keyboard online. Check if all keys work, test anti-ghosting, N-key rollover, and see key history with visual feedback.

Test keyboard

IP Lookup

Look up any IP address or domain. Get geolocation, ISP info, DNS records, reverse DNS, VPN/proxy detection, and view location on map.

Look up an IP

Crawler Exposer

Real-time bot and scanner analytics dashboard. Monitor crawlers, detect honeypot hits, and analyze web traffic from automated visitors.

Watch the bots

Privacy Scrub

Remove EXIF metadata from photos. Strip GPS location, camera info, and personal data. 100% client-side - files never leave your browser.

Scrub metadata

Personal Notes

Create, organize, color-code, and pin your notes. Synced to your TechTools account. Free and private.

Take a note

Slate

Your second brain: write Markdown notes, connect them with [[wiki-links]], explore backlinks & #tags, and see it all as an interactive knowledge graph. Synced & private.

Open your vault

Diagrams

Create flowcharts, org charts, network diagrams and more. Drag-and-drop shapes, connect nodes, export to PNG/SVG. No signup required.

Draw a diagram

ISDOC Viewer

View and edit Czech ISDOC electronic invoices. Upload .isdoc/.isdocx files, inspect all fields, edit inline, and export. Supports v5 & v6.

View ISDOC

News / Zprávy

Tech, AI, business and science news. Available in English and Czech. Updated every 30 minutes, free and ad-free.

Read the news

Streamer

Watch free movies instantly. Modern streaming interface with simple admin panel for uploading content. No registration required.

Watch now

Public Chat

Join the public chat room! Chat with anyone online in real-time. No registration required - just pick a username and start chatting.

Join the chat

Live Q&A

Engage your audience with real-time Q&A sessions. Create events, collect questions, and let participants upvote the most important ones.

Ask & vote

Kanban

Visual project management board. Organize tasks with drag-and-drop columns, track progress, and boost team productivity.

Open the board

Animal Atlas

Explore 50+ dog breeds with detailed profiles, photos, temperament traits, and care requirements. Your ultimate breed encyclopedia.

Browse breeds

Launchpad

Submit and discover tools. No registration, no CAPTCHA. Bot and AI friendly API for automated submissions. Launch your startup instantly.

Launch a tool

Mushroom Atlas

Complete mushroom foraging encyclopedia with 50+ species profiles, identification wizard, seasonal calendar, safety guides, recipes, and interactive quiz.

Identify a mushroom

Space Invaders

Classic arcade action with online multiplayer leaderboard. Register to save your high scores and compete with players worldwide!

Play now

Empire Conquest

Build your empire, expand territory, and conquer the map! Online multiplayer strategy game with resource management, army building, and real-time territory conquest.

Conquer the map

Age of War

Evolve through five ages, train units, build turrets and crush the enemy base. Play single-player vs AI or real-time 1v1 multiplayer!

Start the war

Baron Fight

League of Legends themed clicker game. Build your champion army, collect Riot Points, and defeat the mighty Baron Nashor!

Fight the Baron

Minecraft Server

Join our modded Minecraft 1.21.11 Forge server! Survival gameplay with custom Weapon Leveling mod. Connect at mc.techtools.cz

Join the server

Poker Clock

Free poker tournament clock with one-click start. 50,000 chips, automatic blind levels, audio alerts. Perfect for home games!

Start the clock