Add Subtitles to Video

Drag & Drop or Click to Select a Video

MP4, MOV, WebM, or MKV, then an SRT or VTT file

Tip: paste a video file from clipboard (Ctrl/⌘+V).

Shareable link

Settings are written to the URL as you change them. Nothing differs from the defaults yet.

Put dialogue or captions on a video from an SRT or VTT file. Burned text becomes part of the picture and shows everywhere; a subtitle track stays separate so viewers can switch it off.

Load the subtitles

Pick an .srt or .vtt file, or paste the cues into the text box. Each cue needs a time line such as 00:00:01,000 --> 00:00:03,500 followed by its text. The Cues panel counts what was read, flags blocks whose times could not be parsed, and warns when cues run past the end of the video, which usually means the file belongs to a different cut.

The preview shows the cue under the playhead as it plays, so scrub to a few lines and check the timing before exporting.

Burn in vs subtitle track

Burn in draws the text into every frame and re-encodes the video. It works on Instagram, TikTok, WhatsApp, and any browser, and it cannot be turned off.
Subtitle track writes the cues as a WebVTT track next to the video and audio, which are copied untouched when the container allows it. VLC, mpv, and most TV players list it as a subtitle option. Browsers and most upload sites ignore embedded tracks.

MKV is the default container for a track because it can copy any source codec. MP4 re-encodes VP9 and AV1 sources to H.264, and WebM re-encodes H.264 to VP9.

Style

The style controls apply to burned text.

Text size is a percentage of the frame height. 5% is about 54px on a 1080p frame, a common size for dialogue.
Position puts the block at the bottom or top. Top is for clips with on-screen text or a lower third already at the bottom.
Margin is the gap from that edge, also a percentage of the height.
Background chooses a dark outline around the letters, a translucent box behind each line, or neither. The outline keeps more of the picture visible; the box reads better over busy, bright footage.

Long lines wrap at 90% of the frame width. A cue that already has line breaks keeps them.

Timing offset

Shift timing moves every cue by the same amount, to a hundredth of a second. Cues pushed before zero are clamped to the start, and cues that end before zero are dropped. A drift that grows over the length of the video is a frame rate mismatch, not an offset, and needs retiming in a subtitle editor.

Frequently Asked Questions

What files does it take?

A video in MP4, MOV, WebM, or MKV, and subtitles as an SRT or WebVTT file, or pasted as text. Formatting tags such as <i> and ASS style codes are removed, because a burn-in draws plain text.

Burn in or subtitle track?

Burn in when the video will be uploaded or played somewhere you do not control: social sites, messaging apps, and browsers all show burned text. Use a track when viewers should be able to turn captions off or pick a language in VLC, mpv, or a TV player.

My subtitles appear early or late. What do I change?

Set Shift timing. A positive value shows every cue later, a negative value earlier. A constant offset usually means the file was timed against a version with a different intro.

Why can't I add a track to a MOV file?

The export container sets what a file can hold. MOV has no WebVTT track type, so the track is written into MKV, MP4, or WebM instead. MKV takes any source without re-encoding.

Does the text look the same in the export as in the preview?

Yes for burned text: the preview and the export draw each cue with the same function, with size and margin as percentages of the frame height. A subtitle track is styled by the player, so its look depends on where it plays.

Explore Our Tools

Browse all tools

Video Trimmer

Cut the start and end off a video by dragging in and out handles on the timeline. Cut on the exact frame with a re-encode, or copy the kept part without re-encoding by cutting at key frames.

Video Converter

Convert video between MP4, MOV, WebM, and MKV. Streams that already fit the new container are copied without re-encoding; the rest are re-encoded to H.264, VP9, AAC, or Opus.

Video Compressor

Reduce a video's file size by choosing a quality level or a target size in MB. Set the codec (H.264, VP9, or AV1), scale the frame down, and re-encode or remove the audio.

Emboss Video Effect

Turn every frame of a video into a lit relief, as if pressed into metal or paper. Set depth, light angle, blend, and whether color is kept; depth scales with the output size. Exports MP4 or WebM with the original soundtrack.

Audio to MIDI

Turn a single-line recording into a MIDI file: the pitch track is segmented into notes you can see on a piano roll, then written as a format 0 .mid with the tempo, quantizing, and transposition you set.

Sparkle Video Effect

Add starburst sparkles to the brightest points in every frame of a video, twinkling as they change from frame to frame. Set highlight threshold, sparkle density, ray size, and ray count. Exports MP4 or WebM with the original soundtrack.

Black Mist Video Filter

Add the look of a black pro-mist diffusion filter to a video: light sources bloom into a soft veil and blacks lift slightly. Set diffusion strength, veil spread, black lift, highlight bias, and warmth. Exports MP4 or WebM with the original soundtrack.