Reverse Video

About Reverse Video

This online reverse video tool plays videos backwards with delivery-grade control: reverse video and audio together, or only one stream, and choose your re-encode quality (CRF). How reversing works under the hood: FFmpeg decodes every frame, reverses their order, then re-encodes them into your chosen container. Because frames can't be stream-copied in reverse, a re-encode is always required, so the tool maps the right codecs per container — H.264/AAC for MP4 and MOV, VP9/Opus for WebM — and can add a faststart flag for progressive web playback. All processing happens locally in your browser for complete privacy.

Which codecs and containers does the output use?

MP4 and MOV outputs use H.264 video with AAC audio; WebM outputs use VP9 video with Opus audio. The tool picks the codec automatically from the container you choose so the file is always valid and playable. Unsupported input containers (e.g. FLV/WMV) fall back to MP4 on output.

Why does reversing always re-encode instead of stream-copying?

Reversing changes the order of every frame, so the bitstream has to be rebuilt — you cannot copy compressed frames and play them backwards. That is why a quality (CRF) setting matters: CRF 18 keeps maximum quality, 23 is balanced, 28 produces a smaller file. Even the un-reversed track is re-encoded when you change container so it can be remuxed safely.

What is the practical RAM/length ceiling for in-browser reversing?

The reverse and areverse filters buffer the entire decoded stream in RAM. Under the browser's WebAssembly heap (~2-4GB) the real ceiling is well below the 100MB file cap for high-resolution or long clips. As a rule of thumb stay under 1-2 minutes at 1080p; the tool warns you when a clip looks too large and may crash.

Can I make a boomerang or ping-pong loop?

Reverse your clip here, then concatenate the original followed by the reversed copy to get a forward-then-back boomerang (ping-pong) loop. Trim to a short segment first for a tight social-media loop.

Is this useful for sound design (reversed reverb, cymbal swells)?

Yes. Use Audio Only mode to reverse just the soundtrack while keeping the picture forward — ideal for reversed-reverb risers, backward cymbal swells and pre-roll whooshes. Use Video Only to reverse the picture while keeping sync audio forward.

What video formats are supported?

Input: MP4, WebM, MOV, and other common formats. Output: You can keep the same format as input or convert to MP4, WebM, or MOV.

How do I reverse a video?

Upload your video, choose reverse mode (both video & audio, video only, or audio only), then click 'Reverse Video'. You can preview the reversed result before downloading.

What is the file size limit?

The maximum file size is 100MB. This ensures smooth processing in your browser. For larger videos, consider using desktop video editing software.

What are the reverse modes?

Both Video & Audio: Plays everything backwards - visual and sound in reverse. Video Only: Visual plays backwards while audio remains forward. Audio Only: Sound plays backwards while visual remains forward. Choose based on your creative needs.

What are common uses for reversed videos?

Creative effects (magic tricks, water flowing up), Music videos (reverse dancing), TikTok/Instagram effects, Comedic timing, Learning purposes (analyzing movements in reverse), Special effects creation.

Will video quality be affected?

You control the re-encode quality with the CRF selector: High (CRF 18) for near-lossless delivery, Balanced (CRF 23) for everyday use, or Small (CRF 28) for a lighter file. MP4/MOV use H.264, WebM uses VP9. This tool uses FFmpeg for professional-grade video processing.

Is my video file safe?

Absolutely! All video processing happens directly in your browser using FFmpeg.wasm (WebAssembly). Your video file is never uploaded to any server. Everything stays private on your device.

Why does FFmpeg take time to load initially?

FFmpeg.wasm is a powerful video processing library (about 30MB) that runs in your browser. It only needs to load once per session. After loading, all reverse operations will be fast and efficient.

How long does processing take?

Processing time depends on video length and device performance. A typical 1-minute video takes 15-45 seconds. Longer videos or slower devices may take more time. Reversing requires reading all frames, so it can be slower than some other operations.

Can I reverse long videos?

Due to the 100MB limit and processing requirements, this tool works best with videos under 2-3 minutes. For longer videos, consider splitting them first or using desktop software.