Converter.run

Converter.run

55 free converters that convert video, audio, images, PDF, and data files locally in the browser—files are never uploaded.

free
Last Updated 9/7/2026
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About Converter.run

Converter.run is a collection of file conversion tools that run in the browser, offering 55 free converters covering video, audio, images, PDF, and data files. It performs conversions locally via WebAssembly: files are never uploaded to a server, and there is no upload or download waiting—conversion starts as soon as you drop in a file. Some tools even keep working offline once their page has loaded. According to the official site, the engine is the same as professional tools: FFmpeg for media, and proper PDF and image processing libraries for documents and images. It works on desktop, tablet, or phone—any device that can run a modern browser.

Best for

Users who need to convert video, audio, images, PDF, or data files but don't want their files uploaded to a server
Users handling sensitive files who worry about online converters leaking their contents
Users who want to convert files occasionally without signing up for an account or installing software

Best use cases

Convert documents, images, or audio recordings containing sensitive content locally, without uploading

Keep using already-loaded conversion tools when your network is unstable or you're offline

Quickly do a one-off file format conversion on your phone or tablet

Features

Local conversion—files never leave your device

Conversions are completed in the browser via WebAssembly, so files are never uploaded to a server. Drop in a file and conversion starts immediately—no waiting in upload or download queues.

55 conversion tools

Offers 55 free converters covering video, audio, images, PDF, and data files.

Full-fidelity conversion engine

Media conversion uses FFmpeg, while documents and images are handled with proper PDF and image processing libraries (the official site says these are the same as professional tools).

Works offline

Once a tool's page has loaded, you can keep converting even without an internet connection.

No account, no watermarks, no daily limits

No account registration required, no watermarks on output files, no daily limits, and no locked "pro" formats.

Works across devices

Works on desktop, tablet, or phone—as long as it can run a modern browser.

Pros

  • Conversion happens locally in the browser—files are never uploaded to a server or any third party
  • No upload or download queues—conversion starts the moment you drop in a file
  • Some tools keep converting offline after their page has loaded
  • Free, with no account, no watermarks, and no daily limits
  • Works on desktop, tablet, and phone—all you need is a modern browser

FAQ

According to the official site: all converters run entirely in the browser, using WebAssembly and native Web APIs. Once you select a file, reading, converting, and saving all happen locally—there is no upload step, and the file is never transferred to their servers or any third party.
The official site states that all tools are completely free, with no account requirement, no watermarks, no daily limits, and no locked so-called "pro" formats.
There is no server storage, so there is no "files are kept for X hours and then deleted" policy; conversion results exist only in browser memory and disappear once you close the tab.

Tool Information

DeveloperConverter.run
Release Date9/7/2026
Pricingfree
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