Free browser video tools
Start by task
Inspect, compress, convert, trim, extract audio, shift subtitle timing, create short GIFs, and capture thumbnails in your browser.
Best for lightweight video prep when you need a smaller clip, MP4 output, silent video, extracted audio, subtitle timing adjustment, or a cover image with browser-side processing.
Category
Video tools
Access
Free
Data handling note
Video tools read local media in the browser. Heavy operations load ffmpeg.wasm only after you start processing, so test short clips first and avoid sensitive media on shared devices.
Last updated
September 21, 2026
Featured tools
Best starting points in Video tools
These tools are surfaced from the category decision guide, so they match the most common tasks before the full list below.
Start here when you need duration, dimensions, file size, aspect ratio, or estimated bitrate before choosing another tool.
Next: Then trim, compress, or convert based on the actual file details.
Processing: No FFmpeg load; reads browser metadata.
Use this before compression when only a short range needs to be published.
Next: Then compress the shorter clip or extract a thumbnail from the final range.
Processing: Loads ffmpeg.wasm after you start trimming.
Use CRF, resolution, and audio bitrate controls when upload size or sharing speed is the problem.
Next: Try 720p, CRF 30-34, and conservative audio bitrate before pushing quality higher.
Processing: Loads ffmpeg.wasm after you start compression.
Use this when a platform expects MP4 or you need a resolution change. WebM/VP9 output is temporarily unavailable.
Next: Convert after trimming when possible so the browser processes less video.
Processing: Loads ffmpeg.wasm after you start conversion.
Download an audio file when narration or sound needs separate review.
Next: Play the downloaded track and check its duration and format.
Processing: Loads ffmpeg.wasm after you start audio processing.
Use a short video range when motion is necessary to explain the task.
Next: Keep loops short and check the downloaded animation and file size.
Processing: Loads ffmpeg.wasm for GIF export.
Select a frame or contact sheet from a local video file.
Next: Check the exported image and destination crop.
Processing: Browser video and canvas capture.
Shift SRT or WebVTT cue times while keeping the input subtitle format.
Next: Check subtitle alignment against the final video.
Processing: Browser-side text processing.
- Compressing a long source clip before trimming away the unused range.
- Assuming every codec will decode in browser memory.
- Making GIF ranges too long for a practical browser export.
- Testing large video files first on mobile instead of starting with a short clip.
Available now
All Video tools
Do AscendLab video tools upload my files?
No. Compression, conversion, trimming, audio extraction and GIF export use local ffmpeg.wasm after you start. The inspector and thumbnail tool use browser media APIs; subtitle shifting processes pasted text locally.
Which video jobs are covered now?
Inspect video metadata, compress, convert MP4 or WebM, trim, extract an audio track, shift SRT or WebVTT timing, export a GIF, or select thumbnails and contact sheets. Silent output is an option in the compressor or converter.
Why start with a short clip?
Browser codec support, memory and CPU limit processing. Begin with a small sample, verify playback and sound, then try a larger source. A nominal file-size limit does not guarantee that your device can process every file below it.
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