报告错误/功能要求

免费字幕转换器

即时在SRT、VTT、SSA/ASS、SBV、TXT和JSON字幕格式之间转换。100%客户端处理——您的文件不会离开浏览器。

将字幕文件拖放到此处或点击浏览

SRT, VTT, ASS, SSA, SBV, TXT, JSON

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转换输出 

          

        

      


      
      

        
关于字幕格式

        

          

            

              
SRT (SubRip)

              
最广泛使用的字幕格式。兼容几乎所有媒体播放器和视频平台。使用逗号分隔的毫秒（HH:MM:SS,mmm）。

            

          

          

            

              
VTT (WebVTT)

              
Web视频文本轨道格式。专为HTML5视频设计，所有现代浏览器均支持。使用点分隔毫秒（HH:MM:SS.mmm）。

            

          

          

            

              
ASS / SSA (SubStation Alpha)

              
支持丰富的样式、定位、卡拉OK效果和高级排版。在动漫字幕组和复杂字幕制作中广泛使用。

            

          

          

            

              
SBV (YouTube SubViewer)

              
YouTube原生使用的SubViewer格式。简单的时间戳格式，适合视频平台上传和基础字幕制作。

            

          

        


        
如何转换字幕

        

          

            

              
1

              
上传或粘贴

              
拖放字幕文件或将内容直接粘贴到编辑器中。

            

          

          

            

              
2

              
选择输出格式

              
输入格式自动检测。从下拉菜单中选择所需的输出格式。

            

          

          

            

              
3

              
转换并下载

              
点击转换查看预览，然后下载文件或复制到剪贴板。

            

          

        

      

    

  







    

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常见问题


        

        

            
            

                

                
subtitle conversion runs in your browser: paste a URL, upload a file, or record from your mic. STT.ai picks the AI model and returns the transcript in under 5 minutes. Export as TXT, SRT, VTT, DOCX, JSON, or PDF.

            

            
            

                

                
Yes — every visitor gets 600 free minutes/month on STT.ai, usable for subtitle conversion the same as any other workflow. Paid plans starting at $5/month unlock longer files, private transcripts, and priority queueing.

            

            
            

                

                
subtitle conversion runs on the same AI models as the rest of STT.ai — our best models reach 95-97% accuracy on clean speech (3-5% Word Error Rate on benchmarks). Switch models on the fly if the first pass is below your target.

            

            
            

                

                
subtitle conversion can run on any of STT.ai's 10+ models — STT.ai Enhanced (most accurate), Whisper Large V3 (99 languages), NVIDIA Canary (#1 WER on supported langs), Whisper Turbo (fast), Moonshine (lightweight), and more.

            

            
            

                

                
Yes. Every transcript exports as SRT or VTT — works with YouTube, Vimeo, TikTok, VLC, and every major video player. The burn-subtitles tool overlays them onto video as hardsubs.

            

            
            

                

                
Yes. Speaker diarization automatically labels each voice (Speaker 1, Speaker 2, ...) and you can rename them in the built-in editor. Works across all models and languages.

            

            
            

                

                
Most subtitle conversion jobs finish in under 5 minutes. A 1-hour audio file typically completes in 2-3 minutes with our fastest models. Speed depends on chosen model and current GPU load.

            

            
            

                

                
subtitle conversion accepts 20+ formats — MP3, WAV, M4A, FLAC, OGG, MP4, MKV, MOV, WebM, AVI, and more. Output to TXT, SRT, VTT, DOCX, JSON, or PDF.

            

            
            

                

                
Yes. Audio files submitted to subtitle conversion are processed and deleted by default. Pro plans add client-side encryption — even if STT.ai's database is breached, your transcripts are unreadable without your key. Data is never used for model training without explicit opt-in.

            

            
            

                

                
Yes. STT.ai offers a REST API with Python and Node.js SDKs, plus an MCP server for Claude and Cursor — all usable for subtitle conversion workflows. Free API tier includes 100 minutes/month.

            

            
            

                

                
Yes. Every transcript opens in the built-in editor where you can correct words, rename speakers, adjust timestamps, and add notes. All changes save automatically.

            

            
            

                

                
Every transcript gets a unique shareable URL. Export to DOCX or PDF for email. Pro plans add password-protected and permanent links — useful for client work.

            

            
            

                

                
STT.ai handles 1,300+ platforms including YouTube, Vimeo, TikTok, SoundCloud, Zoom, Google Meet, podcast hosts, and more. URL transcription works with publicly-available content only — DRM-protected sources can't be transcribed.