Video Converter

📖 Tool Introduction

A video converter that runs entirely in the browser, powered by FFmpeg compiled to WebAssembly, so nothing is uploaded to a server and there is no software to install. Once a video is loaded you see its duration, resolution and size, along with an estimate of the output size to plan against.

Outputs cover MP4, WebM, MKV, AVI, MOV and GIF, plus MP3, WAV and AAC for pulling the audio track out on its own. Resolution spans six presets from two-forty up to fourK with a custom option, and frame rate, video bitrate, CRF quality, audio bitrate and channel count are all settable. The effects tab carries brightness, contrast, saturation, rotation, flipping and speed.

The crop tab trims either by time range or by region of the frame, accepting both an hours-minutes-seconds format and a plain seconds value. The batch tab queues several files under one parameter set, and when conversion finishes each result gets its own download button.

In practice a few jobs come up most often: shrinking a large clip shot on a phone so it can be sent, turning MOV into the more universally accepted MP4, extracting the audio track as MP3 for podcast material, rendering a short highlight as an animated GIF, or trimming the intro and outro off to keep only the main content. All of that happens in the browser without hunting around for an online conversion site.

The two knobs that most affect output size are resolution and bitrate. Dropping one resolution step saves far more than squeezing bitrate does: going from ten-eighty to seven-twenty usually more than halves the size while looking barely different on a phone. A higher CRF value means a smaller file and worse picture, so if you are unsure leave it at the default, convert a short segment first and decide from there.

The crop tab accepts two ways of writing timecodes. You can use the hours, minutes and seconds format, or simply type a number of seconds, decimals included. Filling in either the duration or the end time is enough, and when both are set the one that is reached first takes effect. To lift a segment out of the middle of a video, set both the start and the end and leave the rest alone.

✨ Key Features

• Export to MP4, WebM, MKV, AVI, MOV and GIF, plus MP3, WAV and AAC for audio-only extraction
• Six resolution presets plus custom sizing, with frame rates from ten to sixty
• Separate video bitrate and CRF quality controls for balancing size against picture quality
• Independent audio bitrate and channel settings, which helps when extracting audio
• Trim by time range or crop by frame region, with timecodes accepted as hours-minutes-seconds or plain seconds
• Brightness, contrast, saturation, rotation, flipping and speed adjustments

🚀 How to Use

1. Click the upload area to choose a video, or drag one in; over thirty input formats are accepted
2. On the basic tab pick the output format, resolution, frame rate and bitrate
3. To tidy it up, use the effects tab for picture settings and the crop tab for the time range or frame region
4. With several files, switch to the batch tab and add them under one shared setting
5. Press convert, wait for the progress to finish, then use the download button on the file you want

⚠️ Things to Note

• The core engine loads over the network: The FFmpeg core is a WebAssembly file fetched online. It is large, so the first run needs patience, and offline conversion is impossible
• Conversion is slow and memory hungry: Encoding happens in the browser. High resolution or long clips take noticeably longer and may use several gigabytes of memory, so try a short segment first
• GIF output grows fast: GIF has poor compression, so long clips or high frame rates produce very large files. Lower the frame rate and resolution
• Keep the tab open: Switching away or closing the tab mid-conversion can interrupt it, so leave the page in the foreground
• Estimates are approximations: The predicted output size is calculated from your settings and the real result will differ somewhat