Subtitle Editor

Edit subtitles with your video playing right next to them. Fix the timing, split and merge lines, find and replace, then save as SRT, VTT, ASS or ten other formats. Everything stays in your browser - just converting? Use the Subtitle Converter.

How to Use the Subtitle Editor

  1. Open your subtitles. Drop a subtitle file into the box, paste the text, or start from scratch. Add your video too if you want to watch while you edit.
  2. Edit lines. Change text and times right in the list. Split, merge, insert and delete lines with the buttons or keyboard shortcuts.
  3. Fix timing. Shift lines, sync two points, convert the frame rate, or set times from the video with Alt+[ and Alt+].
  4. Save. Pick SRT, VTT, ASS or another format and the encoding, then download the file.

Your work is autosaved in this browser as you type. If the tab closes, open the editor again and press Restore.

Three Ways to Fix Out-of-Sync Subtitles

Shift

Every line is late or early by the same amount.

Move all lines, the ticked ones, or everything after a cut.

Two-point sync

The gap grows as the movie goes on.

Set the right start for one early and one late line - the rest follows.

Frame rate

Subtitles made for a 23.976 fps release drift on a 25 fps copy.

Convert the times in one click.

Good Subtitles Are Easy to Read

The list shows the duration and reading speed of every line.

  • Keep it under 17-20 characters per second. Faster lines are marked so you can trim words or give them more time.
  • Two lines at most, about 42 characters each, is the rule most streaming services follow.
  • No overlaps unless two people really talk at once - Fix overlaps cleans them up.

Need a quick look at a file without editing? Use the SRT Viewer or the ASS Viewer.

Common Uses

  • Fix a downloaded subtitle that is a few seconds off, or made for another release.
  • Correct typos and names with find and replace across the whole file.
  • Write captions from scratch for your own video, timed with Alt+[ and Alt+].
  • Clean YouTube captions - auto-caption repeats are removed when you open the file. Then save as SRT, or as VTT for your site with SRT to VTT.

Turning the clip into a GIF? Video to GIF and Add Text to GIF burn a caption right into the image.

Frequently Asked Questions

You can open SRT, VTT, ASS, SSA, SBV, SubViewer, MicroDVD SUB, LRC, SMI, TTML, DFXP, Spruce and EBU STL, and JSON files. The format and the text encoding are detected for you.

Save as SRT, VTT, ASS, SSA, SBV, SUB, LRC, SMI, TTML, DFXP, STL, JSON or plain text.

Open Shift and sync. If all lines are late or early by the same amount, shift them (all, the ticked ones, or from the current line on).

If the gap grows during the movie, use Two-point sync: tell the editor when an early line and a late line really start, and every line in between is stretched to match. Changing 23.976 to 25 fps fixes the classic PAL drift too.

Yes. Add a video from your device and the current line shows on top of it, updated as you type. The video only plays in your browser - it is never uploaded.

Press Alt+[ and Alt+] to set a line's start and end to the moment the video is at.

No. Files are opened, edited and saved in your browser. A working copy is kept in your browser's own storage so a closed tab does not lose your work - it is not sent anywhere.

Ctrl+Z and Ctrl+Y undo and redo, Ctrl+S saves, Ctrl+F finds. With Alt: P plays or pauses, L plays the current line, [ and ] set start and end, S splits at the cursor, M merges with the next line, Enter adds a line, Up and Down move between lines. Press Shortcuts in the toolbar to see the full list.

Click inside the text where the new line should begin and press the scissors (or Alt+S). The time is split in proportion to the text. To join a line with the next one, press the merge button or Alt+M.

It is how fast viewers must read a line. Around 15-17 cps is comfortable, and above 20-25 most people miss words. Fast lines are marked in the list, so you can lengthen them or shorten the text.

Yes - pick the format next to Download. To convert many files at once without editing, use the Subtitle Converter.

Related Tools
Subtitle Converter SRT to VTT VTT to SRT SRT Viewer Video to GIF

Guides & Tutorials

All 38 guides
New Tutorial How to Download Pinterest Videos and Images (iPhone, Android, PC) Oct 27, 2026 · 6 min read Read New Optimization How to Fix a Blurry or Pixelated GIF (Improve GIF Quality) Oct 26, 2026 · 4 min read Read New Tutorial How to Convert WebP to ICO (and Keep the Transparency) Oct 25, 2026 · 3 min read Read