Squoosh.online is your all-in-one portal for free file optimization tools. Compress images, shrink videos, reduce PDF sizes, and create smart archives — all processed locally in your browser using cutting-edge WebAssembly technology. Your files never leave your device.
Purpose-built tools that run entirely in your browser using WebAssembly. No server uploads, no waiting — just instant, private file processing at native speed.
Optimizing your files with Squoosh.online is straightforward and takes just seconds. No technical expertise required — our tools handle the complexity so you can focus on results.
1
Choose Your Tool
Browse our collection of specialized optimization tools organized by file type. Whether you need to compress a JPEG photograph, shrink an MP4 video, reduce a PDF report, or create a ZIP archive, we have a purpose-built tool ready. Each tool is designed for a specific task, ensuring optimal results for your exact use case. Use the search bar or category navigation to quickly find what you need.
2
Process Locally
Drop your file into the tool or use the file picker to select it. Processing begins immediately on your device using WebAssembly — a technology that runs compiled code at near-native speed inside your browser. Your file is never uploaded to a server. Adjust quality sliders, format options, and other settings in real time to find the perfect balance between file size and output quality before finalizing.
3
Download Result
Once processing is complete, review the optimized output and the compression statistics showing exactly how much space you saved. Click the download button to save the result directly to your device. The entire process typically takes only a few seconds for images and documents, and slightly longer for videos depending on their duration. Close the tab when done — no data persists on our end.
Our Advantages
Why Choose Squoosh.online
We built Squoosh.online around a simple principle: powerful file optimization should be free, private, and accessible to everyone — no compromises.
Privacy-First Processing
Every file you optimize stays on your device. Our tools process data entirely within your browser using client-side technology, meaning absolutely nothing is uploaded to external servers. This makes Squoosh.online ideal for handling confidential business documents, personal photographs, and sensitive materials that should never be exposed to third-party infrastructure.
WebAssembly Technology
Our tools are powered by WebAssembly (WASM), a binary instruction format that enables near-native execution speed in web browsers. This technology allows us to run the same advanced compression algorithms used in professional desktop software, but delivered instantly through your browser with no installation required. The result is blazing-fast performance that rivals dedicated applications.
No Registration Required
Start using any tool immediately without creating an account, providing an email address, or sharing any personal information. We believe useful tools should be instantly accessible. There are no paywalls, no forced sign-ups, and no upsell prompts interrupting your workflow. Just open the tool, process your file, and move on with your day.
Cross-Platform Compatible
Squoosh.online works seamlessly across Windows, macOS, Linux, iOS, and Android. Whether you are on a desktop workstation, a laptop, a tablet, or a smartphone, our tools adapt to your screen size and input method. All you need is a modern web browser — Chrome, Firefox, Safari, or Edge — and an internet connection to load the page.
Unlimited Free Usage
There are no daily limits, no file count restrictions, and no premium tiers required for full functionality. Process as many files as you need, as often as you need. Because the heavy lifting happens on your own hardware, there is no server cost for us to recoup per file, which allows us to offer truly unlimited usage without degrading the experience.
Professional-Grade Results
Our tools use industry-standard compression algorithms including MozJPEG, OxiPNG, libwebp, and AVIF encoders — the same libraries used by major tech companies to serve billions of optimized assets. The output quality and file size reduction you achieve here matches or exceeds what you would get from expensive commercial software suites.
Curated Collection
Industry Favorites
We have also curated links to widely trusted third-party optimization services. These popular tools complement our native offerings and are well-regarded across the web development community.
Everything you need to know about using Squoosh.online and file optimization in general.
How does Squoosh.online compress files without uploading them?
Squoosh.online uses WebAssembly (WASM) technology to run powerful compression algorithms directly inside your web browser. When you select a file, it is processed entirely on your device using your computer's own processing power. The file never leaves your machine, which means there is no upload, no server-side processing, and no risk of your data being intercepted or stored remotely. This approach delivers speeds comparable to native desktop applications while maintaining complete privacy.
What image formats does Squoosh.online support?
Our image tools support all major web image formats including JPEG, PNG, WebP, AVIF, GIF, SVG, and BMP. You can compress existing images to reduce file size, convert between formats for better compatibility, and even stitch multiple images together. For modern web development, we recommend converting to WebP or AVIF formats, which offer significantly better compression ratios than traditional JPEG and PNG formats while maintaining excellent visual quality.
Is there a file size limit for compression?
Because all processing happens locally in your browser, the file size limit depends primarily on your device's available memory (RAM) rather than arbitrary server limits. Most modern devices can comfortably handle files up to several hundred megabytes. For very large files such as lengthy videos or high-resolution image batches, we recommend processing them in smaller groups to ensure smooth performance. There are no artificial file size caps or daily usage limits imposed by our platform.
Do I need to create an account to use the tools?
No. Squoosh.online is completely free to use and requires no registration, no email address, and no personal information whatsoever. Simply visit the tool you need, drop in your file, adjust settings if desired, and download the optimized result. We believe file optimization should be accessible to everyone without barriers, and we will never gate our core tools behind a sign-up wall.
How much can I expect my files to be compressed?
Compression results vary depending on the file type and content. JPEG images typically see a 40-70% reduction in file size with minimal visual quality loss. PNG images with large areas of solid color can be reduced by 50-80%. Videos encoded with modern codecs like H.265 can achieve 30-60% smaller file sizes compared to H.264 at equivalent quality. PDF files with embedded images often shrink by 50-90%. The actual savings depend on the original file's encoding efficiency and the quality settings you choose.
Is my data safe when using Squoosh.online?
Absolutely. Privacy is the core principle behind Squoosh.online. Your files are processed entirely within your browser using client-side WebAssembly technology. No file data is transmitted to any server, stored in any database, or accessible to anyone other than you. Once you close or refresh the browser tab, all processed data is cleared from memory. This makes Squoosh.online suitable for handling sensitive documents, confidential images, and proprietary content with confidence.
Can I use Squoosh.online on my phone or tablet?
Yes. Squoosh.online is fully responsive and works on any modern device with a web browser, including smartphones, tablets, laptops, and desktop computers. The tools are optimized for touch interfaces on mobile devices. Performance may vary depending on your device's processing power — newer devices with more RAM will handle larger files more efficiently. We support Chrome, Firefox, Safari, and Edge on all major operating systems including iOS, Android, Windows, macOS, and Linux.
Learn More
Optimization Knowledge Hub
Dive deeper into file optimization with our comprehensive guides. Learn techniques and best practices used by professional developers and designers to deliver fast, efficient digital content.
Stay informed with practical insights on file optimization, web performance, and modern compression technologies.
Image Optimization·12 min read
The Complete Guide to Image Optimization for the Web
Images account for nearly half of all web page weight on average. In this comprehensive guide, we break down the differences between JPEG, PNG, WebP, and AVIF formats, explain when to use lossy versus lossless compression, and walk through practical workflows for reducing image sizes by 40-80% without perceptible quality loss. Whether you are building a personal portfolio or managing an e-commerce catalog with thousands of product shots, these techniques will measurably improve your page load times and Core Web Vitals scores.
Video Compression Explained: Codecs, Containers & Quality
Video files are often the largest assets in any digital project. This guide demystifies the world of video codecs — from the ubiquitous H.264 to the next-generation AV1 — and explains how containers like MP4, WebM, and MKV organize audio and video streams. We cover practical encoding settings, bitrate strategies, and resolution scaling approaches that help you deliver crisp video at a fraction of the original file size. Ideal for content creators, web developers, and anyone who regularly shares video online.
PDF Optimization: Shrink Documents Without Losing Quality
PDF documents can balloon in size due to embedded fonts, high-resolution images, and redundant metadata. In this guide, we explore the internal structure of PDF files and identify the most effective optimization strategies: image downsampling, font subsetting, object stream compression, and metadata stripping. Learn how to reduce a 50 MB report to under 5 MB while keeping every page crisp and every hyperlink intact. Essential reading for anyone who distributes documents via email or web download.