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or click to browse · Free: 1 file · up to 40MB · ~10 min. Upgrade for batch ZIP (1–5 files).
Auto Subtitle Generator turns an uploaded video or audio file into timed subtitle cues you can preview in sync with playback. Adjust line length, cue duration, and silence-gap controls, then download SRT, VTT, or plain-text captions ready for publishing. An optional AI Assistant can proofread wording when you explicitly choose that option; paid batch can process multiple media files into one ZIP of captions.
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Common questions about this tool
Upload common video formats such as MP4 or WebM, or an audio file with clear speech. The tool builds timed subtitle cues you can preview against playback.
You can download or copy SRT and VTT caption files, plus a plain-text transcript of the cue text for notes or repurposing. Paid batch returns a ZIP of SRT and VTT per file.
No. Timing, line formatting, sync preview, and export work without AI. The optional AI Assistant only runs when you explicitly start proofreading on a single file or a paid batch run.
Upload a supported video or audio file, optionally set line length and timing rules, then generate cues. Preview them against playback, edit the text, and download SRT or VTT when you are ready.
Generate timed cues in the free single-file flow, rewrite the starter lines so they match speech, then export an SRT file for your upload. Keep free size and duration limits in mind (about 40MB and 10 minutes).
Common video and audio formats such as MP4, WebM, MOV, M4V, MP3, WAV, M4A, OGG, and AAC work well. Clear speech on the audio track produces more reliable cue timing.
You can export SubRip (.srt), WebVTT (.vtt), or a plain-text transcript. You can also copy any of those formats to the clipboard.
Yes. Free use covers one file in your browser within the free size and duration limits. Batch ZIP for multiple files is an optional paid upgrade later.
No. The free path runs in your browser. Open the tool, upload your file, edit cues, and export from the page.
Yes. Change text, nudge start or end times, split or merge cues, add or delete cards, and search the list. Click a cue to jump the player to that moment.
Max characters per line, max lines per cue, minimum and maximum duration, and silence gap reshape wrapping and on-screen timing. Apply or rebalance after you change the rules.
When you open AI Assistant on purpose, it can suggest wording fixes such as punctuation, spelling, grammar, numbers, and glossary terms while keeping timestamps. You choose which changes to apply.
Free use stays on one file at a time. On a paid plan, Batch ZIP handles 1–5 media files within the paid size caps and returns SRT plus VTT in one download.
No. The tool builds timed cue scaffolds from speech pauses with starter text you should rewrite to match what was said. Always review before you publish.
After cues are ready, use Export Subtitles to download SRT or VTT, or copy either format to the clipboard. Paid batch mode packages SRT and VTT for each successful file in a ZIP.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
Based on 2 research sources:
Learn what this tool does, when to use it, and how it fits into your workflow.
Auto Subtitle Generator helps you build timed captions from a video or audio file online. Upload a clip, review cue cards that sync with playback, edit the text, then download SRT, VTT, or plain text. It is free to start with one file in your browser.
This tool is for creators, editors, teachers, and small teams who need a first caption draft without installing heavy software. It saves time because you get speech-pause timing and formatting controls in one place, then fix wording before you publish.
After export, you can check reading speed with a subtitle QC checker, or burn styled text into the picture with a styled caption burner.
People often search how to generate subtitles from a video or how to create captions for YouTube and social clips. Typing every line by hand is slow. Soft caption files such as SRT and VTT travel well to players and uploads, but you still need readable lines and fair on-screen timing. Longer takes can be shortened with an audio segment trim before cue timing begins.
This tool places cue start and end times around quieter speech gaps, then applies line-length and duration rules. Free single-file mode starts with editable starter text on each cue. You rewrite those lines so they match what was said. Optional AI Assistant proofreading runs only when you choose it. Paid batch ZIP is available later if you need several files at once.
Use it for YouTube uploads, course clips, podcast excerpts, demos, and short social cuts when you need how to create captions from video with editable timing. Editors use it for a first timed draft. Accessibility and localization teams use the SRT or VTT scaffold before a deeper review. Short highlight moments can be isolated with a speech-aware clip cut before captions.
If you need on-video overlays later, generate cues here, then move to burn or style. For a simpler burn without social presets, some workflows use a video caption generator.
Quiet stretches longer than your silence-gap setting help mark cue boundaries. Formatting rules wrap long lines and stretch cues that would flash too fast. Starter lines are a draft—you rewrite them to match speech. Reading-speed hints on cue cards come from text length and on-screen time together.
| Path | What you get |
|---|---|
| Free single file | About 1 file, about 40 MB, about 10 minutes in the browser |
| Paid batch ZIP | 1–5 files, higher size and length caps, SRT + VTT ZIP |
| Optional AI Assistant | Proofread wording when you explicitly run it |
Prefer clear audio. Rewrite starter text before you publish. Match line length to phone or desktop viewing. This is a free caption draft tool, not a full studio editor or burn-in suite. Use only media you are allowed to process. Spot-check the export on the player where you will upload.
Summary: Auto Subtitle Generator turns an uploaded video or audio file into timed subtitle cues you can preview in sync with playback. Adjust line length, cue duration, and silence-gap controls, then download SRT, VTT, or plain-text captions ready for publishing. An optional AI Assistant can proofread wording when you explicitly choose that option; paid batch can process multiple media files into one ZIP of captions.
We’ll add articles and guides here soon. Check back for tips and best practices.
