Add subtitles to video
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How your files are processed
Files are uploaded and processed on our servers, then made available for download.
What this tool does
Add subtitles to video processes your video on our servers and returns a download link.
Pick this path when the task needs more CPU, GPU, or memory than a typical browser tab should spend on one file.
- FFmpeg workers — Add subtitles to video uses demux, encode, and mux steps on our video stack—trim, merge, extract audio, burn subtitles, or strip tracks without a local NLE.
- No editor install — Open a current browser on Windows, macOS, or Linux; the heavy timeline work runs remotely.
- Pair with converters — Need MP4 from MOV first? Run a converter, then return here for mute, trim, or subtitles.
How to use Add subtitles to video?
- Upload — choose the file (or files, if the tool allows multiple) in the supported formats listed on this page.
- Configure — set options such as trim ranges, subtitle files, or audio handling using the fields above.
- Run and download — submit the job, wait for processing, then download your result before the automatic expiry window.
Why use Add subtitles to video?
Add subtitles to video burns.srt or.vtt subtitles into the video frames—ideal when players ignore external caption files or you need a hardcoded review copy.
Upload the video plus a subtitle file that matches timing.
Common uses for Add subtitles to video
- Deliver captioned MP4 to clients who play files offline.
- Create a watermark-style translation overlay for approvals.
- Archive broadcast-safe versions with embedded text.
- Drop results into Slack threads—the /tools/add-subtitles add subtitles flow matches Windows and macOS Chrome.
Output quality tips for Add subtitles to video
Burned subtitles are rasterized into pixels—changing text later requires a new encode.
Use readable font sizes and safe margins; low-bitrate video may compress fine lines.
Add subtitles to video: /utilities vs FFmpeg workers
Browser utilities (/utilities)
JSON formatters and regex testers stay local. They cannot demux H.264, merge MOV segments, or burn subtitles into frames.
This video tool (upload)
Add subtitles to video uploads to our FFmpeg-backed workers for trims, merges, subtitle burns, or audio stripping—then serves a download like our converters.
Keep browser utilities for string tasks. Choose Add subtitles to video when you need GOP-aware cuts, mux changes, or caption burns that need FFmpeg server-side.
Troubleshooting
- Upload fails or stalls: refresh the page, try another browser, or pause strict blockers for this site.
- Extension mismatch: compare your filename with the types named on this page above the upload control.
- Unexpected output: verify time ranges, pixel boxes, OCR languages, or watermark opacity, then rerun once.
- Large file limitations: Add subtitles to video jobs can exceed upload or processing limits; try a shorter clip first.
- Playback issues: if a result will not play, try a more widely supported container/codec via a converter.