Free browser tools &
classic games.
Fast, private browser-based tools for images, PDFs, developers, text, business, finance, design and SEO — plus lightweight classic games you can play instantly. No uploads, no signup.
Browse by category
Ten tool categories plus a games arcade — pick what you need.
Image Tools
Compress, convert, resize and edit images in your browser.
BrowsePDF Tools
Merge, split, compress and rearrange PDF documents locally.
BrowseDeveloper Tools
Format, validate and transform JSON, XML, YAML, CSV and more.
BrowseSecurity Tools
Generate passwords, decode JWTs and create cryptographic hashes.
BrowseText Tools
Count, transform, clean and analyse text in seconds.
BrowseBusiness Tools
Generate invoices, quotes, receipts and purchase orders.
BrowseFinance Tools
Calculate tax, interest, loans and margins quickly.
BrowseDesign Tools
Pick colours, build palettes, gradients and check contrast.
BrowseSEO Tools
Generate meta tags, Open Graph, robots.txt and sitemaps.
BrowseUtility Tools
QR codes, unit converters and other handy utilities.
BrowseClassic Games
Lightweight classic games you can play instantly.
BrowseE-commerce Tools
Calculate fees and profits for Shopify, Amazon, Etsy, eBay and more.
BrowseSocial Media Tools
Plan Instagram grids, format captions and build carousels.
BrowseContent Creator Tools
Chapters, timestamps, subtitles, transcripts and script tools.
BrowseHR & Recruiting Tools
ATS resume scanner, salary comparison, PTO and offer tools.
BrowseEducation Tools
Citations, flashcards, quizzes, study planners and grade tools.
BrowseReal Estate Tools
Rental yield, mortgage affordability, stamp duty and ROI.
BrowsePopular tools
The most useful utilities, all running locally in your browser.
Image Compressor
Compress JPG, PNG and WebP images locally in your browser.
PDF Merge
Combine multiple PDF files into one document.
JSON Formatter
Beautify and indent JSON with 2 or 4 spaces.
Password Generator
Generate strong, random passwords with custom rules.
Invoice Generator
Create professional invoices and download them as PDF.
QR Code Generator
Generate QR codes for URLs, text, Wi-Fi and more.
Word Counter
Count words, characters, sentences and paragraphs.
Color Picker
Pick colours and convert between HEX, RGB, HSL.
Base64 Encoder
Encode text or files to Base64.
Unit Converter
Convert length, weight, temperature, speed and more.
UUID Generator
Generate RFC 4122 UUIDs (v4) in bulk.
Regex Tester
Test JavaScript regular expressions against sample text.
Most Dueneo tools run locally in your browser.
Your files and data stay on your device. We don't upload tool input, we don't log your data, and we don't require an account. Ads, when shown, never see your tool input.
- Private by default. Tool input never leaves your browser unless you choose to download the result.
- Fast. Static, lightweight pages built for Core Web Vitals. No spinners, no waiting on a server.
- Trustworthy. No accounts, no dark patterns, no paywalls. Just useful tools that respect your data.
Classic games
Lightweight, instant, no installs. Perfect for a quick break.
Sudoku
Classic 9×9 number puzzle with four difficulty levels.
2048
Slide numbered tiles to reach 2048.
Minesweeper
Clear the minefield without detonating a mine.
Tic-Tac-Toe
Classic 3×3 noughts and crosses vs a friend or the AI.
Memory Match
Flip cards to find matching pairs against the clock.
Connect Four
Drop discs to connect four in a row.