About FileShrinking
FileShrinking is a free, privacy-first toolkit for compressing images, PDFs, video and audio. Every file is processed entirely in your browser, so nothing you open here is ever uploaded to a server.
Last updated June 27, 2026
Our mission
FileShrinking exists to make file compression genuinely free, genuinely private, and available to anyone with a web browser. Big files slow down websites, clog email inboxes, and fill up phone storage and cloud plans. Shrinking them should not require installing software, creating an account, paying a subscription, or handing your personal documents to a company you have never met. Our goal is simple: give you professional-grade compression that runs on your own device, costs nothing, and respects your privacy by design.
Why “100% in your browser” matters
Most online compressors work by uploading your file to a remote server, processing it there, and sending the result back. That means a copy of your photo, contract, or home video sits on someone else’s computer, at least temporarily. FileShrinking works differently. When you choose a file, it is read into your browser’s memory and compressed locally using WebAssembly builds of trusted, open-source encoders such as MozJPEG, OxiPNG, and FFmpeg. The finished file is handed straight back to you.
The practical result is that your files physically never leave your device. There is nothing for us to store, nothing for us to leak in a data breach, and nothing for us to sell or share. You can prove it to yourself: load any of our tools, disconnect from the internet, and the compression still works, because all the heavy lifting happens on your machine. That local-only model is the foundation of the trust we are asking you to place in us, and it is not a marketing slogan we can quietly walk back later.
What we build
FileShrinking is a growing suite of focused, single-purpose tools. Our image compressorhandles JPEG, PNG, WebP, AVIF and GIF, with companion tools for converting and resizing. Alongside the image tools we offer a PDF compressor that recompresses the images embedded inside documents, in-browser video compression for formats like MP4, MOV, WebM, MKV and AVI, and an audio compressor for MP3, WAV and AAC. Every tool shares the same principles: no uploads, no sign-up, no watermarks, and no artificial file-count or file-size limits beyond what your own device’s memory allows.
How we research and write our guides
Beyond the tools, we publish practical guides and explainers on our blog covering how compression formats actually work and how to get the best quality-to-size trade-off. We take accuracy seriously. Our editorial process starts with primary, authoritative sources: the format specifications themselves, web platform documentation from MDN Web Docs and the W3C, and the documentation of the open-source encoders our tools rely on. We test claims against the real behaviour of the tools we ship, cite our sources so you can verify them, and revise articles when standards or browser support change. When we are uncertain, we say so rather than guessing.
Who maintains FileShrinking
FileShrinking is built and maintained by a small, independent team of web developers who care about performance and privacy on the modern web. We are not venture-backed and we do not run a data business; the site is kept free through unobtrusive, clearly-labelled advertising.
Our maintainers come from web-performance and media-processing backgrounds, and have spent years helping teams ship lighter, faster pages without sacrificing quality. The team leads the project’s technical direction, reviews every tool before release, and is responsible for the editorial standards described above. You can reach us directly at hello@fileshrinking.com.
Advertising, analytics, and your consent
To keep FileShrinking free we display advertising and use analytics to understand which tools are useful. These third-party services are consent-gated: advertising and analytics scripts load only after you agree, and you can decline them and still use every tool. Crucially, none of this changes how your files are handled — ads and analytics never receive your documents, photos, video, or audio, because those are never transmitted off your device in the first place. For the full details, see our published privacy and cookie policies.
Get in touch
Questions, bug reports, or ideas for a tool we should build next are always welcome. Visit our contact page or email us at hello@fileshrinking.com. We read everything and use your feedback to decide what to improve.