Built for people who care about their privacy.
Cluster Tools is a collection of free, browser-based tools for converting, compressing, and editing files. Every tool runs entirely on your device — your files never leave your browser.
Why most online tools are a privacy problem
The standard model for online file tools works like this: you upload your file to their server, it gets processed in the cloud, and you download the result. Every tool on ilovepdf.com, smallpdf.com, tinypng.com, and thousands of others works this way.
When you compress a PDF of your lease agreement, convert your tax documents, or resize a medical scan — that file travels across the internet to a server you know nothing about. Even if the company promises to delete it, it still sat on their infrastructure. Their logs saw it. Their processing pipeline touched it.
For most casual use this is fine. But for anything sensitive — contracts, financial documents, medical records, personal photos, business data — uploading to unknown servers is an unnecessary risk. We built Cluster Tools because the alternative actually works.
How Cluster Tools works differently
WebAssembly
Heavy processing tasks (PDF manipulation, image encoding, HEIC decoding) run via WebAssembly — native-speed compiled code that runs in the browser sandbox.
Web Workers
Processing runs in background threads (Web Workers), keeping the UI responsive while your file is being compressed, converted, or transformed.
File API
Files are loaded directly into browser memory using the File API. No upload occurs. The file never leaves the JavaScript sandbox on your device.
The result is a tool that's often faster than server-based alternatives — because there's no upload time, no queue on a shared server, and no download wait. Your device's processor handles it directly.
Our commitments to you
Zero file access
We have no servers that receive your files. This isn't a privacy policy promise — it's an architectural fact. There's no server to receive your data.
Minimal analytics only
We use Vercel Analytics to collect aggregated, anonymous page view counts. No user tracking, no cross-site fingerprinting, no advertising pixels. We genuinely don't want your personal data.
Free, without paywalls
Every tool is completely free. There are no upload limits hidden behind a sign-up wall, no 'free users get low quality' tiers, and no subscriptions required for full features.
Works offline
Once loaded, most Cluster Tools tools function without an internet connection. Since processing is local, internet access is only needed to load the page — not to run the tool.
Who built this?
Cluster Tools was built by a small independent team of developers. We found ourselves constantly frustrated by online tools that required accounts, imposed arbitrary file size limits, were slow because of server queues, or showed invasive ads.
Modern browsers are genuinely powerful — WebAssembly brings near-native performance to the web, and libraries like PDF-lib, libwebp, and libheif have been compiled to run in JavaScript. The technical capability to build fully client-side file tools has existed for years. We just built the cleanest, most useful version of them we could.
We rely on Vercel Analytics for basic usage statistics. We have no other tracking. We fund the site through minimal, non-intrusive advertising. No user data is monetized.
What Cluster Tools does not do
Questions or feedback?
Found a bug, have a feature request, or want to suggest a tool? We read every message.
Contact us at hello@clustertools.online