Sites and apps similar to Koolyz include FFmpeg, which is free and open source. Other options are Penpot, Affinity, delphitools and Canva. There's no shortage of Image Optimizers like Koolyz, with more than 100 alternatives for Windows, Mac, Linux, Android and iPhone.
Comprehensive multimedia framework for decoding, encoding, transcoding, muxing, demuxing, streaming, filtering, and playback of nearly any audio or video format, with command-line tools, integrated libraries, portable code, and regular security updates for users and developers.
Open-source design platform offering web-based and self-hosted workflows, code inspection in HTML and CSS, adaptive layouts with CSS Grid and Flex, real-time collaboration, auto layout features, reusable components, design tokens, layer support, plugins, and no tracking.
Spain
EU
Unified design solution merging advanced photo, vector, and layout tools for seamless workflow, non-destructive editing, RAW support, batch processing, AI enhancements, GPU acceleration, file compatibility, cloud asset integration, and tailored workspace options.
Australia
Comprehensive web-based utilities for color conversion, image manipulation, gradient and asset creation, typography calculation, PDF preflight, QR and barcode generation, with calculators for units and graphs, all accessible freely without logins or ads.
GermanyEU
A comprehensive design application combining innovative photo and video editing with advanced AI capabilities to streamline creating designs. Users can produce unique graphics, engaging social media content using customizable templates and thousands of images, videos, and fonts accessible through its vast library.
Australia
Privacy-first downloader supporting fast, no-tracking downloads of video, audio, and images from a wide range of social platforms—no account required, open API for free integration, expanding platform support, and no data or analytics collected or stored.
United States
Figma is a web-based platform offering a robust set of tools for vector graphics editing and prototyping, along with offline desktop apps for seamless workflows. Designed specifically for UI and UX design, it emphasizes real-time collaboration, visual versioning, and vector networks to streamline the designer's work.
United States
File Converter is a very simple tool which allows you to convert and compress one or several file(s) using the context menu in Windows Explorer.
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Read, edit, convert, merge, and sign PDF files across devices, for completely free and without signing up.
Singapore
Locally hosted web application offering an interactive GUI to merge, split, reorganize, convert, compress, watermark, secure, sign, flatten, repair, extract images, detect blanks, apply OCR, set permissions, and enable file processing or API integration for PDFs.
United States
PDF24 Creator is free and feature-filled PDF creation, merging and conversion tool for Windows. Its unique feature among the free PDF printer tools is an editor, which allows to easily assemble, create and modify PDF files with Drag & Drop.
GermanyEU
Shutter Encoder is a free professional encoding and conversion software for everyone, developed with video editors.
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