Are files uploaded for this tool?

This browser tool processes the selected media locally on this device. The file is not uploaded to ArtPlayer servers for this workflow.

Will the export have a watermark?

No. ArtPlayer browser tools do not add watermarks to exported files.

Why can processing take time?

The work runs in your browser, so speed depends on your device, browser, memory, source size, and the export settings needed for the result.

Which browsers work best?

Recent Chrome, Edge, and other modern Chromium browsers usually work best for heavier browser media processing.

What should I try if a large file fails?

Try a smaller source, close other heavy tabs, reduce resolution or duration first, and keep the tab open until the export finishes.

How do I fix audio that is early or late?

If sound is late, use a negative value; if it is early, use a positive value. For example, -200 plays sound 200 ms earlier. Preview and adjust manually, up to 10 seconds in either direction and less than the video duration. This shifts the whole audio track; it does not fix sync that gradually drifts.

What does the exported MP4 include?

The MP4 keeps the original video quality and duration, with the main audio track converted to AAC. Subtitles and extra tracks are not included. Audio shifted outside the video is trimmed, and gaps are silent. Supported input formats depend on your browser.

Browser video tool

Sync Audio and Video

Local processingOriginal video quality

Move sound earlier or later to match the picture. Preview your adjustments, then export an MP4.

Source video

Choose a file

Drop a file here, or click to choose one.

0:00.0 / 0:00.0

Audio offset (ms)

How it works

Three steps to finish the browser workflow.

1
Choose a video file
Choose a video that already has sound.
2
Audio offset (ms)
Positive values delay sound; negative values play it earlier. For example, use -200 when sound is 200 ms late.
3
Download MP4
Play the preview and adjust the offset until the sound matches the picture. Then export and download the MP4.

Input, output and limits

Check supported inputs, output formats and usage requirements before you start.

Supported input	Video files such as MP4, MOV and WebM. Container and codec support depends on the browser and processing runtime.
Output result	Export options: MP4.
Processing and privacy	Processing runs on this device. Source media is not uploaded for this workflow.
Browser requirements	A browser with the decoding and encoding capabilities needed by the selected media. Available codecs vary by device.
Usage limits	Processing capacity depends on duration, dimensions, codecs, settings and available device memory. Large inputs can fail; keep the original file.
What does the exported MP4 include?	The MP4 keeps the original video quality and duration, with the main audio track converted to AAC. Subtitles and extra tracks are not included. Audio shifted outside the video is trimmed, and gaps are silent. Supported input formats depend on your browser.