SRT to VTT
SRT to VTT Converter
Convert SRT subtitles to WebVTT online for HTML5 video, browser players, and track elements.
Open toolConvert, fix, and clean
subtitle files in your browser.
Subtitle Toolkit gives you fast, free tools for SRT, VTT, and ASS conversion, timing fixes, and format cleanup. No signup, no server upload — everything runs locally.
- Free forever
- No signup
- Browser-local processing
Core tools
Start with the jobs people actually search for.
Convert, shift, clean, and repair subtitle files without opening a heavy video editor or uploading them to a server.
VTT to SRT
VTT to SRT Converter
Convert VTT captions to SRT online for legacy editors, uploads, and review workflows.
Open tool ASS to SRT
ASS to SRT Converter
Convert ASS or SSA subtitles to SRT online for YouTube uploads, editors, and simple caption workflows.
Open tool Delay fixer
Subtitle Delay Fixer
Fix out-of-sync subtitles by shifting SRT, VTT, or ASS captions earlier or later in milliseconds.
Open tool Cleaner
Subtitle Cleaner Online
Clean subtitle files online by removing HTML tags, fixing spacing, and keeping SRT, VTT, or ASS timing intact.
Open tool Encoding fixer
Subtitle Encoding Fixer
Fix garbled subtitles online by converting SRT, VTT, ASS, SSA, and SMI files to clean UTF-8 text.
Open tool Video extractor
Extract Subtitles from Video
Extract embedded text subtitle tracks from MKV, MP4, MOV, and WebM files locally with no video upload.
Open toolJump into common subtitle jobs.
SRT to VTT converterVTT to SRT converterASS to SRT converterFix subtitle delayClean SRT fileSRT validatorWebVTT validatorExtract subtitles from videoYouTube subtitle converterSRT vs VTTHow to convert subtitles to plain textHow to remove timestamps from subtitlesWhy YouTube subtitles upload failedHow to fix garbled subtitlesHow to extract subtitles from MP4Why SRT file won't upload
Built for trust and speed.
No server upload
Files never leave your browser. All processing happens locally, so privacy is built in by default.
Instant processing
No waiting, no queueing. Paste or upload a file and get results immediately.
Free forever
No signup, no limits, no paywall. Every tool is completely free to use, now and always.
Popular guides
Learn what format to use and when.
How to convert SRT to VTT for HTML5 video
Convert SRT to VTT for HTML5 video. Add the WEBVTT header, change timestamp commas to dots, and make browser-ready captions with no upload.
Read guideWhy YouTube subtitle upload failed
Diagnose YouTube subtitle upload failures by checking SRT structure, timestamp formatting, encoding, file type, and unsupported styling.
Read guideHow to convert subtitles for YouTube
Convert VTT or ASS subtitles into YouTube-ready SRT captions and avoid styling, timestamp, and upload compatibility problems.
Read guideHow to fix subtitle delay
Fix subtitle delay when captions appear ahead of audio or behind speech. Measure the offset and shift SRT, VTT, or ASS timing online.
Read guideWhy your SRT file will not upload
Diagnose why an SRT subtitle file fails to upload by checking timestamp format, cue numbering, blank lines, encoding, and file structure.
Read guideWhy subtitles do not show in HTML5 video
Diagnose HTML5 video subtitles that do not show by checking WebVTT format, track setup, response headers, browser behavior, and player delivery issues.
Read guidePick the cluster that matches the job.
Every guide on this site is grouped into one of four clusters. Open a cluster to see all its guides and jump straight into the related tool.
36 guides
Conversion guides
Format-specific tutorials for getting subtitle files ready for the right destination.
Start with How to convert ASS to SRT
Open cluster25 guides
Subtitle sync fixes
Repair timing drift, malformed timestamps, and other subtitle file problems.
Start with Common subtitle format errors and fixes
Open cluster12 guides
Format comparisons
Choose the right subtitle format for browser playback, uploads, and delivery.
Start with ASS vs SRT subtitle format comparison
Open cluster53 guides
Workflow guides
Practical step-by-step advice for common subtitle publishing and editing workflows.
Start with Best SRT settings for YouTube upload
Open clusterCommon questions
Is this really free?
Yes. All tools are completely free with no limits, no signup, and no hidden paywall.
Are my files uploaded anywhere?
No. All processing happens locally in your browser. Your files never leave your device.
What subtitle formats are supported?
SRT, VTT (WebVTT), and ASS. You can convert between any of these formats, shift timing, and clean up formatting.
Do I need to create an account?
No. There is no login, no account, and no email required. Just open a tool and start using it.
Can I convert SRT to VTT for HTML5 video?
Yes. Use the SRT to VTT converter to change comma-based timestamps to dots and add the WEBVTT header required for HTML5 video players.
How do I fix subtitle timing issues?
Use the Subtitle Time Shifter to adjust all timestamps by a fixed amount, or the Partial Subtitle Shifter to fix only a specific time range after a scene cut.
What's the best subtitle format for YouTube?
YouTube accepts both SRT and VTT, but SRT is more reliable. Make sure to use UTF-8 encoding and comma-based timestamps for SRT files.
Can I use these tools on mobile?
Yes. All tools work in mobile browsers (Safari, Chrome, Firefox). Processing happens in your browser, so no app installation is needed.
Do these tools work offline?
Once you load a tool page, it works offline. The processing code runs entirely in your browser without needing an internet connection.
How do I clean up subtitle formatting before upload?
Use the Clean SRT File tool to remove extra blank lines, renumber cues sequentially, and fix common formatting issues that cause upload failures.