Free Tools by Libraryminds
Libraryminds turns audio, video, and text into searchable knowledge using transcripts and timestamps. These free tools help you validate subtitles, generate chapters, measure duration, and write better captions — no signup required.
Choose the tool that matches your next step
Best for
Creators, students, editors, researchers, and writers who need one focused check or conversion without setting up a workspace.
What it does
Use the filters to choose among ten tools for captions, short audio, writing, media runtime, YouTube playlists, chapter preparation, and Discord time codes.
Before you rely on it
Each tool has its own input, format, and usage limits. Browser-based checks and server-processed AI tools handle content differently, so read the scope shown on the selected page.
Explore the complete Libraryminds workflow
Compare transcription plans
Libraryminds is an AI-powered video knowledge engine that transcribes supported video and audio — YouTube videos, podcasts, lectures, webinars, or meeting recordings — and makes completed transcripts searchable. Instead of rewatching footage to find one point, you ask a question in plain language and jump straight to the exact moment it's answered. Every video you add becomes part of a searchable knowledge library you own.
- Upload or import videos once
- Search across all your videos anytime
- Revisit exact moments without rewatching
- Build your personal video knowledge library
Think of it like a private Kindle for videos — everything searchable, organized, and retrievable when you need it.
All Tools
Subtitles
Audio
Writing
Video
Seconds
YouTube Transcript Generator
Turn any YouTube video into searchable text
Get a timestamped transcript when a YouTube video has an accessible caption track. No account needed.
Best for: Research & note-taking
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Seconds
YouTube Playlist Length Calculator
Know how long a course or playlist takes
Paste a playlist link to see its total length at 1x to 2x, a video range, and a daily viewing plan.
Best for: Online courses & lecture series
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30 seconds
SRT/Subtitle Validator
Find and fix subtitle errors before publishing
Check your SRT or VTT subtitle files for errors, timing issues, and formatting problems.
Best for: YouTube subtitles
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1 minute
Text to Speech
Turn written content into spoken audio
Convert text to natural-sounding audio in 9 languages including Hindi, English, and more.
Best for: Voiceovers & narration
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1-2 minutes
Audio to Text
Get a text transcript from a short audio clip
Transcribe short audio files (up to 2 minutes) to text with AI-powered accuracy.
Best for: Meeting notes & clips
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Instant
Word Counter
Know exactly how long your content is
Count words, characters, sentences. Get reading time, speaking time, and keyword density.
Best for: Blog posts & scripts
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Instant
Character Counter
Stay within platform character limits
Check character limits for Twitter, Instagram, YouTube titles, meta descriptions, and more.
Best for: Social media posts
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Instant
Duration Calculator
Know a runtime or a total
Check the length of a video or audio file, or add up a list of durations to get the total time.
Best for: Podcast & video editing
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2 minutes
Timestamp Generator
Create clickable video chapters
Generate YouTube chapter timestamps from your transcript or content outline.
Best for: YouTube chapters
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Instant
Discord Timestamp Generator
Share one event time with people in any timezone
Pick a date, time and timezone to get Discord timestamp codes that show in every reader's own timezone.
Best for: Discord events & announcements
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Beyond one-off checks
Keep the moments worth returning to.
These tools solve the task in front of you. When a recording becomes reference material, Libraryminds gives it a permanent home: transcript, timestamps, and search across the sources you collect.
See how a searchable library works
From task to evidence
Save the source, then find the exact moment later.
Not sure which tool to use?
Start with one of these based on what you have:
SRT/Subtitle Validator
Already have subtitles? Check them for errors before publishing.
Try it
Timestamp Generator
Need YouTube chapters? Generate timestamps from your content.
Try it
Audio to Text
Have an audio clip? Get a text transcript in minutes.
Try it
Key Facts
Works with: Audio, Video
Outputs: TXT, SRT, VTT
Includes: Timestamps
Signup: Not required
Frequently Asked Questions
What is Libraryminds used for?
Libraryminds is an AI-Powered Video Knowledge Engine. Upload or import videos once and they become instantly searchable — find exact answers, moments, and insights in seconds. It includes AI summaries, timestamped recall, and subtitle export (SRT, VTT).
Is Libraryminds a transcription tool or a note-taking app?
Libraryminds is an AI-Powered Video Knowledge Engine — not a transcription tool or note-taking app. Upload your videos, search across all of them like Google, and jump to exact moments with timestamps. It's a permanent knowledge library for everything you've watched.
Do these free tools require an account?
No. All free tools on this page work without signup or login. You can use them immediately in your browser.
How is transcript search different from reading a transcript?
Transcript search lets you find specific words or phrases across hours of content and jump directly to that moment in the recording. Reading a transcript requires scrolling through the entire document manually.
Can I export subtitles or chapters?
Yes. Libraryminds exports transcripts as plain text (TXT), SRT subtitles for video platforms, and VTT format for web videos. The Timestamp Generator creates YouTube-compatible chapter markers.
Is my data stored when I use free tools?
Processing depends on the tool. Counters and format checks run through the page, while transcription, speech generation and the playlist calculator send the input to a Libraryminds service. Review the boundary explained on each tool page and the Privacy page before submitting sensitive content.
What file formats does Libraryminds support?
Libraryminds supports common audio formats (MP3, WAV, M4A, OGG) and video formats (MP4, MOV, MKV, WebM). The free Audio to Text tool accepts files up to 2 minutes.
Is Libraryminds related to books or libraries?
No. Despite the name, Libraryminds is not a book library or reading app. It is an AI-Powered Video Knowledge Engine that helps you search any video like Google — finding exact moments, answers, and insights inside your uploaded videos and audio files.
All ten tools can be opened without signup; page-specific limits apply
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