# Video SRT Softmux

Add selectable SRT subtitles without burning them in.

> Canonical page: https://elysiatools.com/en/tools/video-srt-softmux

- **Category:** Media

- **Keywords:** srt, subtitle, softmux

## Overview

Soft subtitles remain toggleable. Video/audio streams are copied; the subtitle text is converted only when the container requires it.

## Inputs

- **Video File** (file)
- **Subtitle File** (file)
- **Output Container** (select)
- **Subtitle Language** (text)
- **Subtitle Title** (text)

## When to use

- When you want to add subtitles to a video but keep them optional and toggleable for the viewer.
- When you need to embed subtitles quickly without wasting time or quality on re-encoding video and audio.
- When preparing media files for players that support soft subtitles in MKV or MP4 containers.

## How it works

- Upload your video file and the corresponding SRT subtitle file.
- Select your desired output container (MKV or MP4) and specify the subtitle language and title.
- The tool copies the video and audio streams directly and muxes the subtitle track into the output file.

## Use cases

- Adding English subtitles to a movie file while preserving the original video quality.
- Preparing multi-language video files by muxing a specific SRT file into an MP4 container.
- Packaging lecture recordings with toggleable captions for students.

## Frequently asked questions

### Will this tool re-encode my video?

No, the tool copies the video and audio streams directly, ensuring zero quality loss and fast processing.

### What output formats are supported?

You can choose between MKV and MP4 containers for the output file.

### Can I turn the subtitles off while watching the video?

Yes, since these are soft subtitles, you can toggle them on or off in any compatible media player.

### What subtitle formats does this tool accept?

The tool accepts SRT (.srt) subtitle files.

### Can I set a custom language code for the subtitle track?

Yes, you can specify the subtitle language code, such as 'eng' or 'spa', to help media players identify the track.

## Related tools

- [Stream Passthrough Trimmer](https://elysiatools.com/en/tools/stream-passthrough-trimmer): Stream-copy trimming.
- [Video Audio Replace](https://elysiatools.com/en/tools/video-audio-replace): Replace the audio track in a video file with a new audio file while keeping the original video
- [Video Smart Mux](https://elysiatools.com/en/tools/video-smart-mux): Combine video with external audio using copy mode.
- [Batch Audio Rename](https://elysiatools.com/en/tools/audio-batch-rename): Batch rename audio files using patterns, text replacement, numbering, and case conversion. Returns renamed files as a ZIP download.
- [Duplicate Audio Library Finder](https://elysiatools.com/en/tools/audio-duplicate-library-finder): Find exact and near-duplicate audio across uploaded files or a ZIP, including copies saved with different codecs.
- [Video Audio Volume](https://elysiatools.com/en/tools/video-audio-volume): Adjust the audio volume in a video file by increasing, decreasing, or normalizing sound levels
- [Video Speed Changer](https://elysiatools.com/en/tools/video-speed-changer): Change video playback speed (faster or slower) while maintaining audio pitch
- [Audio Vocoder](https://elysiatools.com/en/tools/audio-vocoder): Apply a vocoder effect using a carrier and modulator

## Samples

- [Video Samples](https://elysiatools.com/en/samples/video-samples): Sample video files in different formats and orientations
- [Video AV1 Samples](https://elysiatools.com/en/samples/video-av1-samples): Sample video files encoded in AV1 format
- [Video H.264 Samples](https://elysiatools.com/en/samples/video-h264-samples): Sample video files encoded in H.264 (AVC) format
- [Video H.265 Samples](https://elysiatools.com/en/samples/video-h265-samples): Sample video files encoded in H.265 (HEVC) format

## Related content

- [Stream Copy, Remux, and Media Packaging Tools](https://elysiatools.com/en/hubs/stream-copy-remux-and-media-packaging): Compare probe, remux, trim, mux, soft-subtitle, cover-art, and batch rewrap tools in one hub for low-CPU media packaging workflows.
- [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.
- [Text Case, Encoding, and Normalization Conversion Tools](https://elysiatools.com/en/hubs/text-convert): Compare text case conversion, character-width conversion, encoding conversion, quoted-printable handling, and inline text normalization tools in one hub.
- [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows.