VIDEO TOOLS
Compress, trim, crop or recover playable sections. Free tools on your device, with MP4 downloads.
or drag a file into this area
MP4, MOV, WebM, MKV · Support depends on the video codecDrag to select. Move the box or resize a corner.
Original
Drag either end to trim. Drag the middle to move the range.
Your video stays on this device. Processing uses your browser; nothing is uploaded.
Keep this tab open. Processing time depends on your video and device.
Preview the result before sharing it. Your original file is untouched.
SEE IT IN ACTION
Real results from this tool. Compare the videos, then try the same settings yourself.
Result A 360p export keeps the full clip and audio in a lighter file.
This example trades resolution for size. Results vary with content and browser.
Download result ↓This preview could not play. Try loading the example in the tool.
Result Keep seconds 1–6 and crop around the speaker for a vertical video.
One continuous clip, centered on the speaker by a fixed crop. No automatic subject tracking.
Download result ↓This preview could not play. Try loading the example in the tool.
Result A deliberately damaged copy is scanned, and undecodable frame groups are removed.
Missing footage is not recreated. This example requires a readable video index.
Download result ↓This preview could not play. Try loading the example in the tool.
Recorded outputs from the browser tool; all three retain audio. Compression is not lossless, and recovery results vary by file. Footage & method
Use the video compressor when a clip is too large to share or store. Start with a quality preset or an approximate target size.
Review moving subjects, small text and the final file size. If it exceeds your upload limit, try a smaller preset or trim unnecessary footage first.
Target sizes are approximate. An already efficient video may get larger after re-encoding. Compression is not lossless and does not guarantee a specific reduction.
Trimming chooses when your clip starts and ends. Cropping chooses which part of the picture to keep. You can combine both in the Edit tab.
Check the first and last frames, framing and audio. Rotation keeps the crop attached to the same selected area.
The tool keeps one continuous clip. It does not join multiple files, remove several internal sections, or automatically reframe a moving subject.
Use Repair for a readable H.264 or HEVC video with broken frames. The scan checks frame data and decoding before offering an export.
The result may be shorter because damaged frame groups are removed. Audio follows the retained timeline. A healthy video can also be saved in a fresh MP4 container.
Missing footage and a missing MP4 index (moov) cannot be reconstructed. This is recovery of readable sections, not guaranteed repair of every corrupt file.
A filename extension identifies the container, not the codec inside it. Browser support depends on both.
| Task | Input and output |
|---|---|
| Compress / edit | MP4, MOV, WebM and MKV inputs when the browser can decode their tracks. Compression exports H.264 or supported H.265/HEVC MP4; editing exports H.264 MP4. Resolution is never increased. |
| Repair | Readable H.264 or HEVC video. Retained video packets keep their codec in a new MP4; missing indexes cannot be rebuilt. |
| Audio / storage | Compatible AAC can be copied. Editing or other decodable audio may need AAC conversion and stereo downmixing. Large exports depend on available temporary storage. |
Choose 25 MB as the target, then check the downloaded size. The encoder aims for a smaller file, but bitrate control varies by browser and content. Audio also takes part of the budget. The page tells you if the output exceeds the target.
Trimming removes time from the beginning and end. Cropping removes picture area around your selection. To make a landscape clip fit a vertical frame, choose 9:16 and move the crop box to your subject; preview before exporting.
No. Repair checks damaged video frames and saves playable sections. If the video plays correctly but its sound is noisy, use the separate video noise removal tool.
Video processing happens locally in your browser. No account is needed. Close the page to release its previews; temporary output files are cleared when you change files or on a later visit.
A recent Chrome, Edge or Safari works best. Compression and editing need an available video encoder. Input support depends on the codec, and very large outputs depend on available device storage.
No. Repair removes undecodable sections; it cannot invent missing footage or rebuild a missing MP4 index. Damaged keyframes may require removing an entire group of frames. Always review the exported video.
FIELD GUIDE
The video workspace has three different jobs. Pick the mode that matches the problem before adjusting settings; compression, editing and damaged-frame recovery produce different results.
Choose Compress to reduce a file for sharing, Edit to trim or reframe a clip, and Repair to inspect playback problems and keep decodable sections. Repair is not a general enhancer and cannot recreate picture data that is missing.
Choose a quality tier or a target file size according to where the video will be sent. A target is an estimate, not a guarantee: source content, audio and encoder limits all affect the final size. Already efficient footage may not get smaller at the selected quality.
If the result is larger than the original or misses the target, try a lower quality tier, a shorter clip or a different size target. Keep a copy of the source so you can compare details and retry without loss to the original.
Set the start and end around the part you need, then choose a crop ratio, rotation and frame rate. Crop presets use a centered composition unless you adjust the crop area. Preview the subject near the edges and check that a vertical or square crop does not cut off important content. Edited output is H.264 MP4 and may differ in quality or size from the source.
Repair scans supported H.264 or HEVC video for frames that fail decoding or lack usable references. It can omit damaged frames and join the remaining playable sections while preserving their audio timing where supported.
It cannot recover missing pixels, rebuild a lost MP4 index or guarantee smooth transitions around damage. Some keyframe failures can require dropping a larger run of frames. Read the scan summary before export and inspect the result around each removed section.
The video workspace processes the selected file in the browser without uploading it. Encoding uses device memory, storage and supported codecs; large files may need time and free disk space. Keep the tab open during scanning and export. The original file is not modified.
Play the result in a normal player before sharing. Confirm the intended crop and duration, review audio and picture synchronization, and check that the file is smaller when compression was the goal. For repair, look closely at transitions around skipped frames. If playback fails, try a supported browser or export a shorter section.