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Bulk Video Subtitle Burner

Burn one shared SRT subtitle file permanently into a whole batch of videos with font-size and bottom/top/middle position control. Course creators hard-sub 20 lessons for platforms that ignore caption files — FFmpeg WASM, 2 free batches a day. Videos never leave your device — compression and conversion run locally in your browser with FFmpeg WASM.

Runs on FFmpeg

100% Local Browser Native

How to Use the Bulk Video Subtitle Burner

1. Pair videos and subtitles

Upload MP4s plus one shared SRT file applied to every video (default size 18, bottom position).

2. Style the captions

Set font size and bottom/top/middle position. Burn one video first and check its first and last minute.

3. Process and download

Subtitles burn permanently into each video. Saves count against Pro downloads (signed-in free: 2 a day).

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Frequently Asked Questions

Burn-in vs sidecar captions — which?

Burn-in when platforms strip caption files (WhatsApp, Instagram, some LMS players) — text becomes pixels, always visible. Sidecar SRT when viewers need toggle and translation. A 20-lesson course burns one styled set for social and ships SRT for YouTube.

How do files pair with subtitle tracks?

One uploaded SRT burns into every video in the batch (force_style FontSize plus Alignment 2 bottom, 8 top, or 5 middle) — there is no per-file auto-pairing. Mismatched timing burns permanently wrong, so spot-check one video's first and last minute before running all 20.

What styling stays readable on phones?

Bold default sans at size 18+ (raise it for phones), bottom-center with safe margins: desktop-readable small text shrinks to illegible on 6-inch screens. There is no font-face or color picker — size and position only.

Are my videos and subtitles uploaded?

No — burning runs locally in your browser with FFmpeg WASM; files never leave your device. Only final saves count against Pro downloads.

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Last updated October 2026