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VERT

Free File Converter 250 Formats — No Upload

Convert 250+ file formats in your browser — files never leave your device. No upload required.

v2026.04
Apr 2026
WindowsmacOSLinuxFreeOpen Source

Every popular online file converter — CloudConvert, Zamzar, Convertio — uploads your files to a remote server before converting them. Your documents, videos, and personal photos travel to corporate servers you do not control, are held there during processing, and may be retained afterward. For sensitive files, large videos, or anyone on a slow connection, this is a serious problem.

VERT solves this entirely by running the conversion engine inside your browser. FFmpeg, ImageMagick, and Pandoc are compiled to WebAssembly and executed locally on your machine, meaning your files never leave your device at any point. There is no upload step, no waiting for a server, and no file size limit imposed by bandwidth or storage quotas.

The tool handles over 250 formats across images, audio, video, and documents. You can convert a batch of PNG images to WebP, turn a video into an audio track, or transform a document into a different format — all in the same session. Advanced users can adjust encoding parameters, quality settings, and bitrates instead of accepting a black-box result.

VERT works in any modern browser without installation and can be self-hosted via Docker for teams that require a fully private internal tool. Compared to cloud alternatives, it carries no subscription fee, no ads, and no data retention.

Related Tools

  • Stirling-PDF — Edit, merge, split, and compress PDFs locally — pairs with Vert for a complete offline document workflow
  • NanaZip — Extract archives you receive alongside the files you convert with Vert — both run locally without cloud uploads

FAQ

Is VERT free?+
Yes, VERT is completely free and open source under the AGPL-3.0 license. There are no paid tiers, no registration, and no limits on file size or conversion count. A self-hosted version is also available for private deployments.
How to convert files without uploading them to a server?+
Open vert.sh in any modern browser. Drag your files onto the page, select the output format, adjust any settings you need, and click Convert. Everything runs locally in your browser using WebAssembly — no file ever leaves your device.
Best free alternative to CloudConvert?+
VERT is the strongest free alternative because it processes files entirely in your browser using WebAssembly, meaning there is no upload, no server, and no privacy concern. CloudConvert uploads your files to its servers and limits free conversions to 25 per day.
VERT vs CloudConvert — which is better?+
CloudConvert handles server-side processing and supports more obscure format combinations, but your files leave your device. VERT is better for privacy — files never leave your computer — and for regular conversions it is completely free with no account and no daily limit.