Transform your media
into publish-ready video
Create a video from an image and MP3, edit the audio of an MP4, or merge multiple clips — in seconds, no installation, no sign-up.
Drop your MP4 files here
or click to select · 20 files max · 500 MB per file
Four tools, one interface.
Select the tab that matches your need — each mode accepts a specific file combination.
Create a video
Generate an MP4 from a still image and an audio file. Add a text overlay, fade in/out, and photo motion effect.
1 image (JPG/PNG) + 1 MP3
Edit audio
Replace or mix the audio track of your video. The video stream is never re-encoded — fast and lossless.
1 MP4 + 1 MP3
Merge videos
Concatenate multiple MP4 files into one. Reorder clips by drag & drop. Optional transitions between clips.
2 to 20 MP4
Overlay video
Overlay a second video on top of the main one. Choose position, size, opacity and which audio track to keep.
2 MP4
Three steps, that's it.
No configuration, no account. Choose your mode, upload, download.
Choose mode & upload
Choose from three modes: Create a video to generate an MP4 from an image and MP3, Edit audio to replace or mix the soundtrack of an MP4, or Merge videos to assemble up to 20 MP4 clips into one file. Drag and drop your files or click to select them.
Order or confirm
In merge mode, reorder your clips by drag and drop. In audio mode, verify your MP4 + MP3 pair. In image to video mode, configure the text overlay, its position and fade duration — all optional.
Export & download
Start processing. Once done, preview the result directly in the interface, name your file, and download it — as MP4 whatever the chosen operation.
Built to get straight to the point.
No bloat. Every feature exists to save you time.
Private by default
Your files are processed on the server and never shared with third parties. No tracking, no content analysis.
Quick to learn
Clean interface, linear workflow. From upload to download, everything fits in three actions with no learning curve.
No installation
Everything works from the browser. No software to download, no plugin, no dependency to install.
Preview before download
Watch the merged file directly in the page before downloading. Zero bad surprises.
Free reordering
Drag and drop clips in any order before uploading. Remove or add files at any time.
Custom filename
Choose the exact name of the exported file before downloading. Handy for keeping your projects well organized.
Audio: replace or mix
Attach an MP3 to your MP4 to replace the original audio, or mix both tracks. The video track is never re-encoded.
Image to video
Send a JPG or PNG image and an MP3 to generate a complete video: target resolution, fade in/out, text overlay with customizable font and color. Ideal for automating content creation.
Frequently asked questions
Everything you need to know before you start.
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Accepted formats depend on the mode:
- Create a video — exactly 1 image (JPG or PNG) + 1 MP3 — generates a video lasting as long as the MP3, with the image as background.
- Edit audio — exactly 1 MP4 + 1 MP3 — replaces or mixes the MP4 audio.
- Merge videos — 2 to 20 MP4 (video/mp4) files merged into one.
MIME type is verified server-side by magic byte analysis, not only the extension.
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No. Files are stored temporarily during processing and download. An automatic cleanup deletes expired jobs after 2 hours. Your files are never shared or analyzed.
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Each file is limited to 500 MB. You can upload up to 20 clips per job. These limits may change.
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Yes. The merge engine handles clips with different resolutions or codecs. For optimal quality, clips in the same format and resolution are recommended.
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Processing time depends on the total volume to merge. For clips with the same codec, merging is near-instant. For heterogeneous clips (different resolutions or codecs), re-encoding may be needed and can take a few minutes.
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Yes, entirely free for now. No account required, no credit card. The service may evolve towards a freemium model in the future.
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When your clips are in the same format and codec, merging is done without re-encoding: original quality is preserved at 100%. If re-encoding is needed (mixed resolutions or codecs), quality will be maintained at the highest possible level.
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Yes. The interface is responsive and works on smartphones and tablets. File selection and reordering are adapted for touch.
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The Create a video mode generates an MP4 from a still image and an audio file:
- Upload 1 JPG or PNG image and 1 MP3 file.
- The video will be exactly as long as the MP3 — the image stays as background.
- A fade in and out can be added (0 to 2 seconds, default 0.5s).
- A text overlay is optional: choose content, position and color.
- A photo animation (Ken Burns, zoom, pan) can be enabled.
This mode is ideal for podcast videos, lyric videos or music content.