500+ free file tools (PDF, image, audio, video, data, 3D) that run entirely inside your browser via WebAssembly. No uploads, no account, works offline, available in 25+ languages.
A startup from Germany that is founded by Daniel Gottstein.
This page is designed to help you find out whether Gottrix.app is good and if it is the right choice for you.
Almost every "free" online file converter works the same way: you upload your file to a server, it gets processed there, and you download the result. gottrix works differently. Every single conversion, from compressing a PDF to trimming an MP3 to converting a HEIC photo, runs entirely inside your own browser using WebAssembly. Your file is never sent anywhere, which is not a policy promise but something you can verify yourself: open your browser's DevTools Network panel during a conversion and watch that nothing goes out, or switch to airplane mode after your first visit and confirm the tools still work.
gottrix covers more than 500 tools across PDF (merge, split, compress, OCR, redact, sign, edit), images (format conversion, compression, editing), audio and video conversion, data formats (CSV, JSON, XML and more), and even 3D model conversion (STL, OBJ, GLB). Instead of hunting down a different single-purpose site for each format, gottrix is meant to be the one place you go for all of it.
Because nothing is processed on a server, there is no file size limit tied to a subscription tier, no watermark, no forced account, and no usage cap. It is completely free. The site is hosted in Germany, runs on TLS A+ configuration, and is independently audited for its security headers.
This architecture also has a real privacy and compliance benefit: since gottrix never receives, stores, or processes your files, there is no data processing relationship to disclose, no third-party server risk, and no GDPR data processing agreement required for the file content itself. That matters for anyone converting contracts, invoices, medical documents, or anything else they would rather not hand to an unknown server.
gottrix is available in 25+ languages and is closed-source. It launched in July 2026 and is actively maintained.
Listed in
Astro and TypeScript for the site itself, Tailwind CSS for styling, and WebAssembly for the actual conversion engines (ffmpeg.wasm for audio/video, pdf.js and pdf-lib for PDF, libheif and Squoosh for images), all running inside sandboxed Web Workers with zero network access.
Anyone handling files they'd rather not hand to a third-party server: freelancers and professionals working with contracts, invoices or client documents, students and privacy-conscious individuals doing everyday conversions, and international users thanks to 25+ language support. Also a good fit for regulated or confidential business contexts where uploading a file anywhere isn't an option.
gottrix started from a simple frustration: nearly every "free" online file converter requires uploading your document to someone else's server, even for something as routine as compressing a PDF or converting a photo. gottrix was built to remove that requirement entirely. Everything runs in the browser via WebAssembly, so the file never leaves the device in the first place.
Every conversion runs 100% client-side in WebAssembly - files never touch a server, provably so (you can verify it yourself in DevTools' Network panel, or just try it in airplane mode after the first visit). Most converters ask you to trust a privacy policy; gottrix lets you check. On top of that: 500+ tools across PDF, image, audio, video, data and 3D formats in one place, no account, no signup, available in 25+ languages.
Competitors like Smallpdf, iLovePDF, Convertio and CloudConvert upload your file to their servers to process it - fine for a random image, risky for a contract, medical record, or anything confidential. gottrix never uploads anything, so there's nothing to leak, no server log of what you converted, and no need to trust a third party with sensitive documents. It's also free without the usual catches: no per-file limits, no watermarks, no forced account, and it keeps working offline once loaded.
We have collected here some useful links to help you find out if Gottrix.app is good.
Check the traffic stats of Gottrix.app on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Gottrix.app on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Gottrix.app's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Gottrix.app on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about Gottrix.app on Reddit. This can help you find out how popualr the product is and what people think about it.
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