Browser-local
Audio Trimmer with Fades
Trim local audio by time, preview a waveform, add fades and download a real WAV, MP3 or Opus file.
Open toolYour files. Your browser.
Free Browser Audio and Video Tools
Trim, merge and convert audio and videos locally. Preview files, choose formats and settings, add subtitles or watermarks, and download real results without uploading.
19 tools · no signup · local processing
Listen, shape, export
Audio tools
Browser-local
Audio Joiner with Crossfade
Join local clips in your chosen order with a gap or crossfade, sample rate and channel controls.
Open toolBrowser-local
Audio Converter: WAV, MP3 and Opus
Convert supported local audio to a real WAV, MP3 or Opus file with explicit bitrate, sample rate and channels.
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Audio Volume, Normalization and Fade Tool
Adjust gain, normalize a peak and add fade-in/out locally, with clipping diagnostics and a waveform.
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Audio Speed Changer with Pitch Options
Change audio speed locally, choosing native pitch-changing playback or a WASM pitch-preserving stretch.
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Online Voice Recorder: MP3 Download
Record with microphone permission, see the live input waveform and preview a locally converted MP3 or the verified original format.
Open toolA clearer edit, one step at a time
Video tools
Browser-local
Video Trimmer: Cut a Clip Locally
Cut a supported local video with a visual timeline and precise start/end controls; export MP4 or WebM with audio preserved.
Open toolBrowser-local
Video Joiner: Merge Clips in Order
Preview and arrange up to three local clips on a visual timeline, then merge with normalized dimensions and frame rate.
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Video Converter: MP4 and WebM in Your Browser
Convert supported local videos to MP4 or WebM using available native codecs or a single-thread WASM fallback.
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Video Compressor with Bitrate and Resolution Controls
Control bitrate, frame rate and output size for supported local clips; compare actual input and output file sizes.
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Video Crop, Rotate and Flip Tool
Crop a video frame with editable coordinates and a visual preview; rotate or flip before cropping.
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Video Speed Changer with Audio Stretch
Change video speed with synchronized audio stretching and explicit output dimensions and frame rate.
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Mute a Video: Remove Its Audio Track
Remove the audio track from a supported local video and verify the exported file has no audio track.
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Extract Audio from Video to WAV, MP3 or Opus
Extract an existing video audio track with time, sample rate, bitrate and channel settings.
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Video to GIF: Clip, Width and Frame Rate
Turn a local video range into an animated GIF with explicit width and frame rate limits.
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Video Frame Capture: PNG or JPEG Thumbnail
Capture a frame near your chosen timestamp as a real PNG or JPEG with size and quality controls.
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Burn SRT Subtitles into a Video Locally
Burn validated SRT text into a local video with English/Chinese font support, size and color controls.
Open toolBrowser-local
Video Text Watermark with Tiling and Live Preview
Add a text watermark with position or full-frame tiling, font size, color, opacity, rotation and spacing.
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SRT Subtitle Delay and Drift Fixer
Shift SRT subtitles earlier or later, or align two known time points to correct steady drift. Preview original and adjusted times before downloading.
Open toolReliable output starts with clear limits
Choose a file, inspect the real media information and preview it. Adjust only the settings you need, then review the generated result before downloading. A progress bar reaching 100% is not treated as proof that a file is valid.
The native browser path is preferred. Some operations load a roughly 32 MB WASM engine; captions and watermarks can load a further 16 MB font, all from this website. No account or paid conversion service is connected.
Open-source components and sources
Mediabunny · FFmpeg WASM · Versions, source links and file digests
Frequently asked questions
Files, formats and browser compatibility.
Are my recordings or videos uploaded?
Media is processed in this browser. The site sends program and font files to your device; it does not receive your media for conversion. Existing page-view statistics do not include tool inputs.
Why does a format work on one browser but not another?
Native codec availability depends on the browser and operating system. Tools check actual files and settings, prefer the native path and use a single-thread WASM fallback for supported operations. Unsupported combinations are explained.
Can these tools handle long or very large videos?
Yes, within the device budget: video sources allow 256 MiB–2 GiB per file and 1–4 hours combined; audio sources allow 128 MiB–1 GiB and 2–8 hours. Long native jobs use chunked reads and can use local temporary output storage. WASM has a smaller, separate memory budget. Available codecs, storage and actual free memory still matter.