Edit subtitles locally: an import-to-export checklist

A useful subtitle editor lets you correct the existing track without asking you to upload a video merely to change one word. The file format, timing rules and export preview should remain visible throughout the edit.

Revid advertises caption editing as part of its video workflow. The interaction worth borrowing is immediate correction near the result. That does not mean a free browser utility needs to reproduce its full generation platform. Revid subtitle tool.

Import a copy and identify its format

Keep the original unchanged. Select the real input format instead of relying only on a filename extension. A file called captions.srt can still contain WebVTT syntax or text copied from a rich document. Plain UTF-8 text is the simplest starting point.

The browser subtitle editor supports a stated plain-text subset. Unsupported styling or timing features are refused rather than silently erased. The format converter explains what each supported import and export preserves.

A worked example

Two fictional cues contain “The lamp is dark” and “The light returns.” A spelling correction changes only text. Splitting the second cue changes both text boundaries and timing, so it needs another playback check. In this editor the split uses the text cursor and halves the cue interval; it does not detect the spoken word boundary.

Merging cues spans their combined interval, including a gap between them. That can display text during silence. Inspect the resulting range instead of assuming that a merge preserves the intended presentation.

Check speed after changing time

Reading-speed findings depend on the cue duration and counting convention. Topicut's CPS count includes spaces and punctuation and excludes line breaks. It counts Unicode code points rather than displayed grapheme clusters. A threshold is a review aid, not a universal platform requirement.

Line reflow keeps timestamps but normalizes whitespace. It cannot decide where a speaker's thought should break. Use the wording, audio and surrounding cues together. Read characters per second when comparing reports from different tools.

Review before handoff

Preview the export, choose the required format and download a copy. TXT deliberately drops timing; CSV is a review table, not a subtitle track. SRT and VTT retain supported timings and plain text, while numbering and headers may normalize.

Open the downloaded file in the intended player and inspect the beginning, an edited cue and the end. Keep a clear version name. Local undo is temporary tab memory, not a durable backup, and a video that plays in the editor may still need a target-player compatibility check.

References checked November 4, 2026. Product descriptions are from public official material, not paid-output testing. Examples and cover artwork are original Topicut editorial material.