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转码器
Files never leave your device

Free online video toolbox that runs entirely in your browser.

Compress, convert, trim, transcribe and retouch video — 90 tools, no upload, no watermark, no sign-up. Files never leave your device.

Browse all tools87 format converters

Everything, by category

Compress & Optimize

4

Shrink video, GIF and audio files while keeping visual quality — straight to the size you need.

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Convert Formats

14

Convert between MP4, MOV, MKV, WebM, AVI and more, plus 87 dedicated format-pair guides.

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Image Tools

12

Compress, resize, crop, rotate and convert images — instant results with zero upload.

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Audio Tools

19

Extract, trim, merge, normalize and denoise audio from video or standalone files.

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Video Editing

27

Trim, merge, crop, watermark, subtitle and speed-ramp video without installing an editor.

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AI Transcription

2

Local Whisper speech-to-text: video to text and auto subtitles, private by design.

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Calculators

4

Bitrate, file size, aspect ratio and timecode math that feeds straight into the tools.

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Analyze & Detect

4

Inspect codecs, scan black or silent segments and read spectrograms before you edit.

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Players

5

Play MKV, AVI, TS, FLV and HLS streams right in the browser — no player install.

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Most used tools

Compress Video
MOV to MP4
Video to GIF
Compress Image
PNG to JPG
MP4 to MP3
Trim Video
Mute Video

Frequently asked questions

Are my files uploaded to a server?

No. Every tool runs on WebAssembly inside your browser tab. Your files are processed locally and never leave your device — that is the whole point of this site.

Is it really free, without watermarks?

Yes. All 90 tools are free with no watermarks and no sign-up. The site is funded by nothing more than goodwill and lightweight ads.

Which browsers are supported?

Any modern browser with WebAssembly: Chrome, Edge, Firefox and Safari. With SharedArrayBuffer enabled, multi-threaded mode kicks in automatically for faster processing.

How large can my files be?

Because processing happens in your browser memory, files up to roughly 1.5 GB work on desktop. Larger files are better handled with the compress tools first.