LocalConvert

Free file converter that never uploads your files

Many files at once, and every one of them stays on your device.

Converter

  • FilesOne or many, images and videos mixed
  • FolderEvery matching file inside, subfolders included
  • ArchiveZIP, RAR, 7z or TAR: convert the contents or the archive itself

Drop files, folders or archives here

Unsupported files are skipped. Nothing is uploaded.

Everything runs in your browser. Files are not uploaded.

Good to know

What can change during a conversion. Each conversion page also lists the notes that apply to that pair.

JPG

Transparency is lost; transparent areas get a solid background.

HEIC

HEIC can only be read, not written, because of patent and licensing reasons.

AVIF

Encoding AVIF takes noticeably longer than other formats.

Video

Large videos need a lot of memory. Files of several hundred megabytes can fail on devices with little RAM.

How it works

  1. Each file is identified by its first bytes, not by its name or extension.

  2. Every file runs in its own background thread. Cancelling stops it instantly and frees the memory.

  3. The fastest route is picked: built-in browser codecs or hardware video. If one is missing, a WebAssembly version steps in.

Your browser can

  • Built-in image codecs
  • Hardware video (WebCodecs)
  • Multiple threads
  • Create AVIF natively

If something is missing, the conversion takes a little longer but still works.

Choose a converter

Convert between JPG, PNG, WebP, MP4, MP3, WAV, PDF, ZIP, RAR and many more formats. The conversion runs entirely on your device, so nothing is sent to a server.

Image converterJPG, PNG, WebP, AVIF, GIF, BMP, ICO and TIFF, plus HEIC and SVG as input.Convert images →Video converterMP4, WebM, MOV, MKV and AVI, or turn a clip into an animated GIF.Convert videos →Audio convertercategory.audio.teasercategory.audio.ctaPDF convertercategory.document.teasercategory.document.ctaArchive convertercategory.archive.teasercategory.archive.cta

Popular conversions

Your privacy comes first

All processing happens locally in your browser. We do not upload, store or analyze your files, and the tool works offline once loaded.

Frequently asked questions

Are my files uploaded to a server?

No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.

Is there a file size limit?

There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.

Will the quality suffer?

That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.

Which browsers are supported?

Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.