Online Subtitle Editor
Edit subtitles and captions directly in your browser. Upload your video or SRT file, adjust timing, fix text, style your captions, and export. No downloads, no technical skills required.
How to Edit Subtitles Online with Subly
Streamlines the process - upload your video and create perfectly timed captions in just a few clicks.
Trusted by thousands of organisations in the US and worldwide
What is a Subtitle Editor?
A subtitle editor lets you modify subtitle and caption files — fix errors, adjust timing, change styling, sync text to video.
You need a subtitle editor when:
- Auto-generated captions have errors that need correcting
- Timing is off and subtitles don't match dialogue
- You're working with an existing SRT file that needs updates
- Captions need restyling for brand consistency or platform requirements
- You want to split, merge, or reformat subtitle blocks
Traditional subtitle editing means downloading software, learning complex interfaces, manually matching timestamps. Subly's online subtitle editor does it all in-browser — upload, edit, export.
Compliant & Professional-Grade
Ensure your subtitles meet EAA, ADA Title II, ACA, and AODA standards, while aligning with WCAG 2.2 AA/AAA guidelines.
Edit Text & Timing
Fix transcription errors, correct spelling, adjust timestamps. Drag subtitle blocks on the timeline to sync perfectly with audio.
Style Your Captions
Customize font, size, color, background, positioning. Match your brand guidelines or platform requirements.
Split & Merge Subtitles
Break long subtitle blocks into readable chunks. Merge short fragments. Control characters per line and reading speed.
Create Video Clips
Use Snippets to clip sections of your video with subtitles intact. Create social cuts without re-editing captions.
Add Text Overlays
Add titles, lower thirds, or text callouts beyond just subtitles. Full text-on-video control.
Resize for Social
One-click aspect ratio presets for YouTube (16:9), Instagram/TikTok (9:16), Facebook (1:1), and more. Subtitles reposition automatically.
Built for Scale, Speed, and Simplicity
Subly’s enterprise-grade platform automates audio description across entire video libraries. Process thousands of files faster, more accurately, and up to seven times more affordably than manual production.
Process thousands of videos with enterprise infrastructure
Minutes, not days. AI-powered automation.
Cut costs vs manual production.
Captions, audio descriptions, transcripts, translation — one platform.
Who Needs to Edit Subtitles Online?
Whether you want to cut the manual work or make sure every video is compliant before it becomes an issue - Subly does the heavy lifting.
Marketing Teams
- Fix auto-caption errors before publishing
- Brand-consistent subtitle styling
- Social media reformatting
Education
- Correct lecture transcriptions
- Adjust timing for complex content
- Multi-format exports for LMS
Corporate L&D
- Edit training video captions
- Ensure accuracy for compliance content
- Batch styling across video libraries
e-Commerce
- Polish product video subtitles
- Localize existing content
- Platform-specific formatting
Media & Entertainment
- Professional subtitle timing
- Broadcast-standard formatting
- Multi-language versioning
Government & Public Sector
- Accuracy review for public content
- Section 508 compliant formatting
- Accessible document exports
Subtitle Editing Is Just Part of the Platform
Subly covers every accessibility requirement for video content:
Captions & Subtitles
Transcriptions
Audio Descriptions
Localisation & Translation
Subtitle Editor
Colour Contrast
Descriptive Transcripts
Frequently Asked Questions
We've got answers! Browse through our FAQ section to find quick solutions and detailed explanations to some of the most common queries. Whether you're just getting started or need specific guidance, our comprehensive FAQs are here to assist you every step of the way.
Request a demo
are already on it.
Yes. Upload your SRT file to Subly and edit directly in your browser. Adjust text, timing, and styling, then export the updated file. No software installation needed.
Import and export SRT, VTT, TTML, and XML. Videos export as MP4 or MOV with burned-in captions. Text transcripts export as TXT or DOCX.
Yes. Drag subtitle blocks on the timeline to adjust timing visually. Or edit timestamps directly in the subtitle editor. Preview playback to check sync before exporting.
Upload your video with existing captions (or generate new ones with Subly's AI), then edit text directly in the subtitle editor. Click any subtitle block to modify. Changes save automatically.
Yes. Customize font family, size, color, background color, opacity, and positioning. Apply consistent styling across your entire video or adjust individual subtitle blocks.
No. Your original file stays unchanged. Subly creates a new output with your edits — either a new video file with burned-in captions or updated subtitle files for use elsewhere.
