Ondertitels in Video Inbranden Online — Gratis Hardsub (SRT/VTT/ASS)
Brand SRT-, VTT- of ASS-ondertitels permanent in je video. Aanpasbare grootte en positie. Geen upload, geen watermerk — draait lokaal.
Sleep je video hierheen, of klik om te bladeren
Max bestandsgrootte: ~2 GB (afhankelijk van geheugen)
Handleiding — Ondertitels in Video Inbranden Online — Gratis Hardsub (SRT/VTT/ASS)
Load video + subtitles
Drop your video (MP4/MOV/WebM/MKV) and pick an SRT, VTT, or ASS file. Both stay on your device.
Adjust style
Choose font size and placement. For fully custom look (font family, color, outline), author an ASS file — your styling is preserved.
Burn and download
Click Burn Subtitles. Output is MP4 with captions baked into the pixels — will show on Instagram, TikTok, X, YouTube Shorts, and anywhere else.
When to burn subtitles into video
- Posting to Instagram, TikTok, X, or YouTube Shorts — platforms where soft subtitle tracks get stripped.
- Creating accessible tutorials or product demos where captions must always be visible.
- Translating a video for a multilingual audience without relying on the player to pick the right track.
Supported formats & limits
| Input containers | MP4, MOV, WebM, MKV, AVI, FLV, WMV, M4V |
|---|---|
| Input codecs | H.264, H.265, VP8, VP9, AV1, MPEG-4, MJPEG |
| Output container | MP4 (default) — interoperable with iOS, Android, YouTube, Instagram, X |
| Output codec | H.264 video + AAC audio |
| Max file size | Up to ~2 GB (limited by browser memory) |
| Max duration | No hard limit — depends on file size |
| Cost | Free for any use. No signup. No watermark. |
Subtitle Burner vs. the usual alternatives
| Feature | This tool | VEED (free) | Kapwing (free) | CapCut Online |
|---|---|---|---|---|
| File size limit | Up to ~2 GB in browser | 500 MB | 250 MB | 5 min / 1 GB |
| Upload required | No — runs locally | Yes | Yes | Yes |
| Watermark on output | No | No | Yes on free tier | Yes on free tier |
| Signup / account | No | Required | Required | Required |
| Works offline | Yes (after first load) | No | No | No |
| Export speed (1 min 4K, M2) | ~8 seconds | ~90 seconds incl. upload | ~2 minutes incl. upload | ~60 seconds incl. upload |
Why burn subtitles here
- Honors ASS styling — your custom fonts, colors, and outlines render exactly as authored.
- Tune size and position for quick SRT jobs without touching the file.
- Runs in-browser on FFmpeg WASM — no upload, no size cap beyond browser memory.
Veelgestelde Vragen
What is the difference between burned (hardcoded) and soft subtitles?
Burned subtitles are drawn directly onto the video pixels — they always show, on any player, but cannot be turned off or translated. Soft subtitles are a separate track stored inside the file; players can toggle them. Use burned subtitles for social media (Instagram, TikTok, X) where soft subtitle tracks are stripped.
Which subtitle formats are supported?
SRT (SubRip), VTT (WebVTT), and ASS/SSA (Advanced Substation Alpha). SRT is the most common — one exported from YouTube, Premiere, or auto-captioning tools will work directly.
Can I customise the font size and position?
Yes. Choose font size (18–36) and position (top/middle/bottom) before burning. For full styling control (custom font, color, outline width) use an ASS file — the tool will honor its styling.
Does the tool upload my video?
No. Both your video and the subtitle file stay on your device. Subtitle burning runs locally using FFmpeg compiled to WebAssembly. Open DevTools → Network tab to verify zero uploads.
Why are my subtitles not showing after burning?
Most common causes: (1) SRT timestamps are out of sync — use the SRT Offset tool to shift them. (2) The SRT encoding is non-UTF-8 (older Chinese/Japanese files are often GBK/Shift-JIS). Re-save as UTF-8 in a text editor. (3) Font size is too small for the video resolution; increase it.