Sharpen Video Online
Processing entirely on your device — large files may take a moment.
The unsharp mask filter boosts edge contrast — the classic sharpening move every editor uses. Medium is the safe default for phone footage; light suits already-sharp 4K; strong rescues visibly soft webcam clips, at the cost of some noise amplification.
Sharpen after any resize, never before — scaling softens edges, so sharpening last locks in the extra detail.
How to sharpen video
- 1
Select your files
Drag & drop your MP4 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to MP4". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MP4 file individually, or grab everything at once as a ZIP archive.
About the MP4 format
MP4 (MPEG-4 Part 14) is the universal delivery container of digital video. It wraps H.264, HEVC or AV1 video with AAC audio, and its structure — separate metadata (moov) and media atoms — is what makes streaming, seeking and fast-start playback possible. Phones, cameras, TVs, browsers and every social platform assume MP4 first.
Quality is entirely a function of the codec and bitrate chosen at encode time, so an MP4 can be a 10 Mbps HEVC master or a postage stamp. That flexibility plus total playback coverage is why nothing has displaced it in twenty years — conversion between formats almost always ends in MP4.
+Strengths
- ✓Plays on every device and platform in existence
- ✓Streaming-ready structure (fast start, seeking)
- ✓Choice of modern codecs: H.264, HEVC, AV1
!Limitations
- −Quality depends entirely on encode settings
- −HEVC variants hit licensing gaps on some platforms
Frequently asked questions
Will sharpening add noise?
It amplifies existing edge contrast, and noise lives in the edges too. If the source is noisy, denoise first and sharpen lightly.
Why does my video look worse on Strong?
Over-sharpening creates halos — bright outlines around edges. That is the filter doing too much; step down to Medium.
Does it work on 4K video?
Yes, but 4K frames take much longer per pass in the browser. 1080p and below process comfortably.