Trusted by 10,000+ creatorsAdd subtitles to a video
No account required. Start in seconds.
Subtitle your video in a few clicks
AutoSubtitles lets you add subtitles to any video online for free. Upload your clip, generate captions with AI, edit them, and export an MP4 with the subtitles burned in. Free to start with no signup; no software install required.
Why creators choose AutoSubtitles
Total control over every caption
Customize every detail: fonts (upload your own with Pro), colors, outline, shadow, background, casing, spacing, alignment, position, and animation. Or start from 28 presets.
Renders in your browser, fast
No waiting to upload your video to a server and no render queue. It stays on your device and captions render right in your browser, so you get your captioned video in seconds.
Viral animated captions
Word-by-word animations and karaoke highlighting in bold, readable styles built for TikTok, Reels, and Shorts.
Export however you need
Download a captioned video with burned-in subtitles on any plan. With Pro, also export SRT, VTT, and TXT files to use anywhere.
Translate into 30+ languages
Translate your captions into 30+ languages with AI while keeping the timing intact.
Free to use, private
Use it free; a paid plan unlocks more. Your video file never leaves your device; only the audio is sent for transcription, then deleted.
Features
No manual typing
AI transcription writes the subtitles for you from the video audio.
Burned-in or sidecar
Hardcode subtitles into the video, or on Pro export an SRT, VTT, or TXT file instead.
Style to match
Pick fonts, colors, outlines, and position so subtitles fit your video.
Fast, browser-side rendering
Exports render in your browser, not on a server, so there is no upload and no render queue. Nothing to install.
Made for YouTube creators, social editors, and businesses.
YouTube creators
Publish videos with captions baked in for viewers who watch on mute.
Social editors
Burn captions into vertical clips so they show everywhere they are reposted.
Businesses
Caption demos, webinars, and ads so they are watchable without sound.
How it works
- Step 1
Upload your video
Drag in an MP4, MOV, or WebM file.
- Step 2
Generate subtitles
AI transcribes the audio so you do not type captions by hand.
- Step 3
Edit and style
Fix wording, tune timing, and choose how the subtitles look.
- Step 4
Export the video
Render an MP4 with the subtitles burned in, ready to publish.
Free vs Pro
Start free, upgrade only if you need more.
| Capability | Free | Pro |
|---|---|---|
| Burned-in subtitles (MP4) | Yes | Yes |
| Editable text and timing | Yes | Yes |
| Export captioned video | Yes | Yes |
| Animations and word highlights | Yes | Yes |
| No watermark | No | Yes |
| HD and 4K export | No | Yes |
| AI translation | No | Yes |
| Custom fonts | No | Yes |
| SRT, VTT and TXT download | No | Yes |
| Saved style presets | No | Yes |
No account required. Start in seconds.
Frequently asked questions
- How do I add subtitles to a video?
Upload your video to AutoSubtitles, generate captions with AI, edit the text and timing, then export an MP4 with the subtitles burned in. On Pro you can also download an SRT or VTT file instead.
- Can I add subtitles for free?
Yes. Generating, editing, styling, and exporting subtitles is free with no signup. Free exports have a small watermark. Pro removes it and adds HD and 4K export, subtitle files, and more.
- What is the difference between burned-in and sidecar subtitles?
Burned-in (hardcoded) subtitles are part of the video image and always show. Sidecar files like SRT or VTT are separate files a player loads on top, which viewers can toggle on or off.
- Do I need to install anything?
No. AutoSubtitles runs entirely in your browser, so there is nothing to download or install.
- What formats can I upload and export?
You can upload MP4, MOV, WebM, and most common video formats. Subtitled videos export as MP4 with the subtitles burned in, and on Pro subtitle files export as SRT, VTT, or TXT.