TFT

Free Online Video Converter — Convert MP4, MKV, MOV, WebM and More

Convert video and audio files between formats directly in your browser. No uploads, no account, no file size limits. Supports MP4, WebM, MKV, MOV, MP3, WAV, and more.

Convert Your Video

Drop your file here

or click to browse

100% Private

Files never leave your device

Lightning Fast

Browser-powered conversion

Unlimited

No file size limits

What Format Conversion Does

Video files have two layers: the container (MP4, MKV, MOV) and the codecs inside (H.264, AAC, etc.). Conversion can change the container, the codecs, or both.

If the codecs are already compatible with the target format, the tool does a transmux — it copies the data into a new container without re-encoding. This takes seconds and loses zero quality. If the codecs aren't compatible, it re-encodes, which takes longer but produces a file that plays everywhere.

This runs locally in your browser. No upload means faster processing and complete privacy.

When You Need This

MKV files won't play on your TV

Older smart TVs and media players don't support MKV. Convert to MP4 with H.264 video — it's a transmux if codecs match, so it takes seconds. The file plays on virtually any device.

Extract audio from video interviews

3-hour video interview is several GB. You only need the audio. Convert to MP3 and get a file that's 10x smaller. Perfect for podcasts or study notes.

MOV files from iPhone won't open on Windows

Windows sometimes needs QuickTime codecs to open MOV files. Convert to MP4 and it plays in the default Windows player without installing anything extra.

WebM for smaller website videos

MP4 works everywhere but WebM with VP9 codec produces ~30% smaller files at the same quality. Convert background videos to WebM for faster page loads on mobile.

Submit to platforms with format requirements

Some portals only accept MP4 or AVI. Convert your WebM or MOV to the required format and submit without hassle. No need to contact support or buy conversion software.

Common Formats Explained

Video Containers

MP4 — Universal compatibility. Works on phones, TVs, computers, everything.
WebM — Web-optimized. Smaller files, modern browsers only.
MKV — Supports multiple audio/subtitle tracks. Limited device support.
MOV — Apple's format. Works great on Mac/iOS, sometimes needs conversion for Windows.

Audio: MP3 vs WAV

MP3 compresses audio — smaller files, slight quality loss. Good for listening, sharing, podcasts. WAV is uncompressed — large files, no quality loss. Use for editing or archiving.

Transmux vs Re-encode

Transmux = copies data to new container without re-encoding. Takes seconds, zero quality loss. Re-encode = converts codecs. Takes longer, required when source and target formats use different codecs.

How to Convert Video

1

Upload your file

Drag or select your video. It stays on your device — no server upload. Works with MP4, MKV, MOV, WebM, AVI, and more.

2

Choose output format

Pick MP4 for maximum compatibility, WebM for web use, or MOV for Apple devices. For audio-only, choose MP3 (compressed) or WAV (uncompressed).

3

Convert and download

Click Convert. Transmux finishes in seconds. Re-encoding takes longer — progress bar shows status. Download when done.

Frequently Asked Questions

Yes, in many cases. When the video track inside the MKV already uses a codec that MP4 supports, such as H.264, the converter performs a transmux operation. It moves the existing video and audio data into the new container without re-encoding, which completes in seconds and produces no quality loss.
If the codecs are compatible and only the container changes, conversion is nearly instant regardless of file size. If the video needs to be re-encoded into a different codec, the time depends on the length and resolution of the video and your device's CPU speed. A 10-minute 1080p video may take several minutes to re-encode on a standard laptop.
Yes. Selecting an audio output format such as MP3 or WAV extracts the audio track from the video and discards the video data. MP3 uses compressed audio and produces smaller files. WAV produces an uncompressed audio file with no quality loss, which is useful for audio editing workflows.
A transmux operation produces no quality loss because the pixel data is not re-encoded. A re-encode operation applies a new compression pass, which can introduce a small quality reduction depending on the target codec and bitrate settings. If preserving the original quality is important, avoid re-encoding when possible.
No. The file is read from your local drive and processed inside your browser's memory. It is never uploaded to a server. No third party has access to your video at any point during or after conversion.
The tool runs entirely in your browser and does not upload files to a server. The practical limit is your device's available RAM. Most devices handle files up to a few gigabytes without issues. Very large files such as raw 4K footage above 10 GB may run out of available browser memory before conversion completes.

Video Compressor

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Video Metadata Viewer

See Video or Audio files metadata

Video Player

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Change Video FPS

Change video frame rate to 24fps, 30fps, 60fps or custom FPS

Crop Video

Crop videos online - remove unwanted edges and reframe

Enhance Video Quality

Upscale, sharpen, denoise and improve video quality

Extract Audio from Video

Extract audio from video files - save as MP3, AAC, or WAV

Resize Video Dimensions

Resize video to 4K, 1080p, 720p or custom dimensions

Rotate Video

Rotate videos 90°, 180° or 270° - fix orientation

Video Color Space Transformation

Adjust brightness, contrast, saturation, hue and more

Video Grayscale

Convert videos to black and white instantly

Video Overlays

Add watermarks, logos or image overlays to videos

Video Transparency Maker

Adjust video opacity and transparency with custom background