AI timestamps every word. Edit each one with millisecond precision. 30 caption styles. Export from your browser.
Upload a video. AI generates word-level timestamps. Split, merge, and time every caption to the millisecond. Export from your browser.
MP4, WebM, MOV · up to 10 min
Most subtitle editors treat each caption block as a single unit. One start time, one end time, one chunk of text. Splitting a block at a specific word means manually re-timing both halves.
A word-level subtitle editor works differently. Every caption block contains individually timed words, each with its own start and end timestamp measured in milliseconds. When you split a caption at a word boundary, the two new blocks inherit exact timing from the words they contain. No guesswork.
SnapSubtitles generates these word-level timestamps through AI transcription. Upload a video, and the transcription returns every spoken word with precise timing. The editor lets you split, merge, edit text, adjust timing, add or delete captions. All operations happen in your browser. As a subtitle generator that never uploads your video, your video frames stay on your device throughout.
Word-level editing · ms precision
Every editing action preserves word-level timing. No operation requires manual re-timing of timestamps.
Place your cursor between any two words and split. The editor creates two new caption blocks. If word-level timing is aligned, the split point falls exactly between the end of one word and the start of the next. Both new blocks keep their timing data intact, so highlight animation continues working without adjustment. This is the operation that separates a word-level subtitle editor from a traditional one.
Select a caption and merge it with the next one. The text concatenates, the timing range adjusts to span both original blocks, and word-level timestamps inside the merged block are preserved.
Click any caption to edit its text directly. Type corrections, fix names, adjust phrasing. After changing text content, the editor flags when highlight animation needs recalibration.
Every timestamp displays in MM:SS.mmm format. Type new values directly into the time fields. The editor validates your input and will not allow overlapping or reversed timestamps.
Insert a new caption block at any position in the timeline or delete captions you do not need. Both operations update the timeline instantly with a live preview.
Four steps. Upload, transcribe, edit, export. Every operation preserves millisecond-precision word timing.
Drop an MP4, WebM, or MOV. Up to 1080p. Video stays on your device.
Audio extracted in browser, sent to AI. Every word gets its own ms timestamp.
Split, merge, edit, adjust. Every operation keeps word-level timing intact.
Download SRT/VTT (Pro/Max) or export captioned MP4 from your browser.
Free plan includes 60 min/month transcription, 720p export.
Millisecond precision is not a cosmetic label. It is the resolution that powers every word-highlight animation and every SRT export in the editor.
Explore all word-by-word caption styles to see the 19 animated options and 11 static styles, all built on the same millisecond timestamp data.
All timestamps in the word-level subtitle editor use MM:SS.mmm format. This is the resolution that makes word-by-word highlight animation possible. Rounding to the nearest second would cause words to light up late or early.
When a caption style highlights individual words during playback, the renderer checks the current video time against each word’s start and end values. Millisecond resolution means the highlight moves with the speaker, not after.
SRT files use HH:MM:SS,mmm format. VTT files use HH:MM:SS.mmm. The millisecond data from the editor writes directly to the file. Import into YouTube Studio, Premiere Pro, DaVinci Resolve, or any standards-compliant player and the timing is exactly what you set.
19 caption styles use word-by-word highlight animation. Every one depends on millisecond timing to sync the highlight with the spoken word. The remaining 11 static styles display full caption text without per-word animation but still benefit from precise block-level timing.
SnapSubtitles runs in your browser. Here's how it compares to desktop subtitle editors.
Both approaches produce valid SRT files. The browser editor is faster for caption-only work. Desktop software offers more post-production control if you need advanced video editing beyond subtitles.
Common questions about word-level subtitle editing, timing precision, and browser-based workflows.
Upload a video. AI generates word-level timestamps. Split, merge, and time every caption to the millisecond. Export from your browser.
