Subtitle Tools — Extract, Add & Convert
Manage your video's subtitle tracks locally. Extract SRT/ASS files or add captions to your video container without uploading.
Subtitles
Extract, add, or remove subtitle tracks
Drop your files here
or click to browse
Supports MP4, MKV, WebM, MOV, MP3, WAV, and more
Privacy: Files never leave your device. All processing happens locally using WebAssembly.
Features
Complete Media Processing Suite
Everything you need to convert, trim, mux, and process media files. All operations run locally in your browser.
Trimming & Cutting
- Trim video and audio using start/end timestamps
- Lossless trimming without re-encoding
- Timeline UI with video thumbnails and audio waveform
- In/Out point selection with visual markers
- Split files into multiple segments
- Keyframe-based cuts for quality preservation
Muxing & Remuxing
- Change container format (MP4, MKV, WebM, MOV)
- Combine audio and video streams
- Replace or remove audio tracks
- Add multiple audio tracks
- Add and remove subtitle tracks
- Change stream order
Audio Operations
- Extract audio from video files
- Combine multiple audio tracks
- Convert audio container formats
- Remove audio metadata
- Preserve original audio quality (stream copy)
- Silence detection for smart cuts
Video Operations
- Extract video-only stream
- Remove video track (audio-only output)
- Copy video stream without re-encoding
- Create silent video
- Change video container format
- Validate media file integrity
Subtitle Operations
- Extract subtitle streams
- Add external subtitle files
- Remove subtitle tracks
- Support multiple subtitle languages
- Manage language tags
- Convert subtitle formats
Stream Inspection
- List all streams (video, audio, subtitles)
- Identify codecs per stream
- Display resolution, bitrate, FPS
- Show timestamps (PTS / DTS)
- Visual stream map
- Enable/disable and reorder streams
Metadata & Privacy
- Read global metadata (title, artist, duration)
- Edit metadata fields
- Copy metadata between files
- Remove all metadata for privacy-safe exports
- Manage and edit language tags
- Privacy indicators throughout
Batch Processing
- Process multiple files at once
- Apply same operation to all files
- Per-file progress indicators
- Export individually or as ZIP
- Folder import support
- Operation presets
Smart Utilities
- Before/after comparison panel
- Output size estimation
- Smart defaults & auto-suggestions
- Undo/reset per operation
- Dry-run/preview mode
- Export operation report (TXT/JSON)
What This Tool Doesn't Do
No server-side processing • No AI transcription • No frame-accurate editing • No video upscaling/denoising • No DRM handling
These limitations ensure fast, reliable, and privacy-focused operation.
Your Files. Your Device. Your Privacy.
We built this tool for people who care about privacy. No compromises.
100% Client-Side Processing
All media operations run entirely in your browser using WebAssembly. Your files are processed locally on your device.
No Files Uploaded
Your media files never leave your computer. Zero data transmission to any server. Complete privacy guaranteed.
Works Offline
After the initial page load, the tool works completely offline. Process files anywhere, anytime, without internet.
No Server Storage
We don't store any files, metadata, or processing history. When you close the tab, everything is gone.
Open Processing
No hidden operations. You see exactly what's happening to your files. Full transparency in every operation.
No Account Required
Start using immediately. No sign-up, no email, no tracking. Just open and use.
Perfect for creators, product teams, developers, QA teams, and anyone who needs quick, reliable media operations without installing desktop software.
More Tools
Explore Other Media Tools
All tools run 100% in your browser. No uploads, no servers, no sign-up required.
Extract Audio
Extract audio track from video file
Remove Metadata
Strip all metadata for privacy-safe exports
Change Container
Convert container format without re-encoding
Inspect Streams
View all video, audio, and subtitle tracks
Trim / Split
Cut video using keyframe-based trimming
Batch Processing
Apply operations to multiple files at once