SRT Subtitle Creator - Online Add Timestamps

An SRT (SubRip Subtitle) file is the most widely supported subtitle format used by video players, streaming platforms, and editing software. It pairs plain text with precise timestamps so subtitles appear exactly when they're needed. Whether you're creating content for YouTube, Vimeo, or local playback, SRT files ensure your audience can follow along — especially valuable for accessibility and international audiences.

Simply paste your subtitle text (one line per subtitle), set the start time for the first subtitle, choose a duration for each subtitle (default 3 seconds), and optionally add a gap between them. Click "Generate Timestamps" and the tool automatically calculates sequential timestamps in the standard SRT format (HH:MM:SS,mmm). You can then fine-tune individual timestamps directly in the preview or use the Shift tool to offset all timestamps at once.

SRT timestamps follow the format HH:MM:SS,mmm where HH is hours (00-99), MM is minutes (00-59), SS is seconds (00-59), and mmm is milliseconds (000-999). Note the comma (not a period) before milliseconds — this is critical for compatibility. Each subtitle entry uses an arrow (-->) between start and end times. Our tool ensures all timestamps are correctly formatted automatically.

Yes! Click the "Enable Editing" button to unlock the preview panel and manually adjust any timestamp or text directly. You can also use the Shift Timestamps feature to move all timestamps forward or backward by a specific number of seconds — perfect for syncing subtitles with video that starts slightly earlier or later than expected.

For perfect sync: (1) Open your video and note the exact timestamp where the first line of dialogue appears. (2) Set that as your Start Time. (3) Choose a duration that matches your speaking pace — 2-4 seconds is typical for most content. (4) Generate the SRT and test it in your video player. (5) If timing feels slightly off, use the Shift Timestamps feature to make a global adjustment. For fine-grained control, enable editing and tweak individual entries.

Absolutely. Use the "Import SRT" button to load any existing .srt file. The tool will parse the file, extract the subtitle text for re-timestamping, and display the original SRT content in the preview panel. You can then modify timestamps, adjust the text, or regenerate with new timing parameters — full flexibility without starting from scratch.

Yes, this SRT Subtitle Creator is completely free with no registration required. There are no limits on the number of subtitles or files you can create. Everything runs locally in your browser — your subtitle text never leaves your device. You can generate, edit, and download as many SRT files as you need, whenever you need them.