Edit text inline
Click any subtitle line to fix typos, reword phrases, or correct AI-generated errors. Changes apply in real-time with live video preview.
Editor
Free Online Subtitle Editor - Edit SRT & VTT Instantly
Already have subtitles but need to fix timing, correct typos, or restyle them? CapsAI's subtitle editor lets you edit SRT, VTT, and ASS files directly in your browser. Adjust word-level timestamps, change fonts and colors, merge or split lines - all without installing software.
SRT
VTT & ASS supported
Free
No signup required
Instant
Browser-based editing
Features
Everything you need to edit subtitles perfectly
Precision timing adjustment
Drag timeline markers or type exact millisecond values to sync subtitles perfectly. Fix desync issues from auto-generated files in seconds.
Restyle fonts and colors
Change font families, sizes, colors, outlines, and shadows. Apply consistent branding across all your subtitle files.
Split and merge lines
Break long subtitle blocks into readable segments or merge fragmented lines. Maintain natural reading flow for your audience.
Import any subtitle format
Upload SRT, VTT, ASS, or SSA files and edit them in a unified interface. Export to whichever format your platform requires.
Live video preview
See your edits rendered on the actual video in real-time. No more guessing if timing and positioning look right.
Workflow
Edit subtitles in 4 easy steps
Step 1
Upload your subtitle file
Drag and drop an SRT, VTT, or ASS file - or upload a video to use AI-generated subtitles as your starting point.
Step 2
Edit text and timing
Fix errors, adjust timestamps, and restyle text using the visual editor with real-time video playback.
Step 3
Preview on video
Watch your edited subtitles play back on the video to verify timing, readability, and positioning.
Step 4
Export in any format
Download as SRT, VTT, or ASS - or burn subtitles directly into the video for a watermark-free export.
Use Cases
Why creators choose CapsAI's subtitle editor
No software to install
Works entirely in your browser. No downloading Aegisub or Subtitle Edit - just upload, edit, and export online.
AI-assisted corrections
CapsAI suggests spelling fixes, punctuation improvements, and timing adjustments as you edit. Accept or ignore with one click.
Batch editing support
Apply find-and-replace across all subtitle lines, shift all timestamps at once, or restyle every line simultaneously.
Works with any video platform
Export files compatible with YouTube, Vimeo, Facebook, LinkedIn, and any player that supports standard subtitle formats.
Why CapsAI
When you actually need a subtitle editor
Auto-generated subtitles get you 90% there. The last 10% is where an editor matters - fixing names the AI got wrong, adjusting timing where speakers overlap, and matching your brand's caption style across multiple videos.
- Fixing AI transcription errors in proper names, brand terms, and industry jargon that speech recognition mangles
- Re-timing subtitles that were generated from a different cut of the video after you trimmed or rearranged scenes
- Reformatting captions downloaded from YouTube for use on Instagram Reels or TikTok where line length matters
- Correcting punctuation and grammar in translated subtitle files where machine translation missed context
- Standardizing subtitle styling across a 20-episode content series so fonts, colors, and positioning stay consistent
Why CapsAI
SRT editing without the learning curve
Most subtitle editors look like they were designed in 2005. You shouldn't need a manual to fix a typo in line 47 of an SRT file. CapsAI puts the video and subtitle text side by side so you see exactly what viewers see.
- Click directly on any subtitle text to edit it instead of navigating raw XML or numbered blocks in a text editor
- Drag waveform markers to adjust timing visually instead of typing timecodes like 00:01:23,456 by hand
- See changes instantly on the video preview instead of re-rendering or re-uploading to check how they look
- Bulk operations like shifting all timestamps forward by 2 seconds when your intro changes length
- Export to SRT, VTT, or ASS without losing styling - no manual format conversion or find-and-replace needed
FAQ
Subtitle editor - frequently asked questions
Can I edit SRT files online for free?
Yes. Upload any SRT file to CapsAI and edit text, timing, and styling directly in your browser. Export the updated file when done - completely free.
What subtitle formats can I edit?
CapsAI supports SRT, VTT (WebVTT), ASS, and SSA files. You can import in one format and export in another if needed.
Can I fix subtitle timing without re-transcribing?
Absolutely. The timeline editor lets you drag, shift, or manually type timestamps for any line without regenerating the entire transcription.
Does the editor work on mobile?
Yes. The subtitle editor is responsive and works on tablets and smartphones, though desktop provides the best editing experience for precision work.
Can I edit auto-generated YouTube subtitles?
Yes. Download your YouTube auto-captions as SRT, upload to CapsAI, fix errors and timing, then re-upload the corrected file to YouTube.
How do I edit an SRT file without downloading software?
Open CapsAI in your browser, drag your SRT file onto the upload area, and start editing. The entire workflow happens online - text changes, timing adjustments, styling updates, and export. Nothing to install, no account required for basic edits.
What is the best free online subtitle editor in 2026?
CapsAI ranks among the top free options because it combines text editing, visual timeline controls, and live video preview in one tool. Unlike older editors that only show raw text, you edit while watching playback. Supports SRT, VTT, and ASS with no watermarks on exported files.
How do I sync subtitles that are out of time with the video?
Upload your subtitle file and video to CapsAI. Use the global offset slider to shift all subtitles forward or back by a set amount. For individual lines that drift, drag the waveform markers to align each caption with the audio. Most desync issues take under 2 minutes to fix.
Can I change subtitle font and color in SRT files?
Standard SRT doesn't store font or color data - those are set by the video player. But CapsAI lets you export as ASS format, which embeds font, color, outline, and shadow settings directly in the file. Or burn styled subtitles into the video itself for guaranteed consistency.
How do I edit subtitles for YouTube videos?
Download your existing captions from YouTube Studio as an SRT file. Upload that file to CapsAI, fix any errors in text or timing, then export the corrected SRT. Upload it back to YouTube under your video's subtitle settings. The whole round-trip takes about 5 minutes.
Edit subtitles online - free, fast, no install
Fix timing, correct text, restyle captions. CapsAI's browser-based subtitle editor handles SRT, VTT, and ASS files in seconds.
Try CapsAI Free →