YouTube Transcript Extensions Compared: 15 Listings, Verified

YouTube transcript extensions divide into two groups. Summarisers send the caption text to a server and return a digest, which needs an account and hands your text to a provider that holds it. Extractors read the caption track YouTube already served to your player and give you the text, with the measurement done in the browser. That split decides more than any feature list.

YouTube transcript Chrome extension comparison

Every figure below was read from the linked Chrome Web Store listing on 19 September 2026: the user count, the rating, the review count, and the date of the last update. Prices come from the vendor's own pricing page read on the same day where one was reachable, and the cell says unverified where it was not. Rows with equal user counts are ordered by review count.

Two rows need a caveat. vidIQ and TubeBuddy are the largest listings that appear in roundups of this category, and neither store description claims transcript extraction. A store user count is also a different measurement from the total a vendor advertises on its own homepage, and only the first is comparable across rows.

Which transcript extensions send your captions to a server

The six largest listings whose own description covers YouTube transcripts are below. Every cell links to the competitor's own store listing or privacy policy so it can be checked at the source.

Read the second column against the third. One of the six states that content goes to third-party AI providers. One states that data is processed and stored locally by default. One describes browsing activity being sent to its servers. The remaining three do not say where caption text goes, and their store disclosures list personally identifiable information as collected. A disclosure is a categorised declaration about what is collected, not a description of the pipeline, so the two columns answer different questions.

YouTube transcript extension without a signup

The no-signup path exists, and it is narrower than the listing suggests. The vendor site for Youtube Transcript states that no account and no credit card are required. Tactiq's YouTube transcript page states that the transcript is available without signing up. In both cases the free path returns the text, and the summary layer is where a server and an account enter the picture.

Two more listings sit either side of that line in their own documentation. Glasp's pricing page tells a paying user to be signed in on both the website and the extension, so its AI features assume an account. NoteGPT's extension policy says summaries and extension data are processed and stored locally by default, with cloud storage triggered only by pressing Save or Share.

What to check before installing a transcript extension

The store listing does not show the permission list, so these checks happen after installing and before you paste anything private into the tool.

Permissions in the manifest. Open chrome://extensions, turn on Developer mode, and read the permission list on the details card. An extractor needs host access to youtube.com and somewhere to keep your settings. Any extension asking for tabs, history, cookies, or webRequest should show a reason you can see.

Host permissions and site access. Host permissions decide which sites an extension can read and change. An extractor that requests access to every site is asking for more than its name suggests, and Chrome lets you narrow that on the details page without uninstalling it.

Whether the code is packed. The store page shows a size, and a package far smaller than the features claimed usually means the work happens on a server instead of in the package. No competitor package can be audited from the store page alone, and this comparison does not pretend otherwise.

What the disclosure claims. The Privacy section of the listing lists data categories and links the developer's policy. Compare those categories against what the tool does. A summariser that declares no collection while its own policy describes sending content to AI providers is worth a second look.

Where the Prepublish extension fits

Prepublish's extension is an extractor, not a summariser, and it publishes its permission list in full: storage, contextMenus, and clipboardWrite, plus host permissions for youtube.com and m.youtube.com and for prepublish.ai and www.prepublish.ai. It declares no web_accessible_resources, ships as Manifest V3 with no build step and no remote code, and has no analytics, no telemetry, and no account.

Two things it deliberately does not do. It does not summarise or interpret the text it pulls: every number it reports, including word count, runtime, and spoken pace, is arithmetic over text in the browser, and the word counter is the same measurement. Its pace figures come from Prepublish's own dataset of 349 measured videos, where the median speaking rate is 181 words per minute (prepublish-fe/lib/seo/wpm-data.ts). It also does not upload your script or transcript to Prepublish. The caption request goes to youtube.com from your own browser session, and the only thing that reaches prepublish.ai is a video id when you open that video's public transcript page, which Prepublish fetches on its own servers. The rest of the free tools take text you paste.

What no transcript extension solves

Videos without captions

Every tool in the table depends on a caption track that YouTube already holds. Where a video has none, none of these extensions produces text, and none of them falls back to speech recognition on the audio. That is a property of the category rather than a defect in one product, and it is the first thing to check when a tool returns nothing.

Auto-translated tracks

YouTube's captionTracks array contains only real tracks. An auto-translation is generated by appending tlang to a real track's URL, so it never appears in that array, and a tool that reads the first listed track can return Turkish text while reporting the language as English. Measured on 19 September 2026, the player listed 31 caption tracks for aircAruvnKk and preselected English >> Turkish for a viewer whose interface language was Turkish; the request kept lang=en and added tlang=tr. Prepublish's rule is to strip tlang from every fetch and choose the track in the video's spoken language, preferring a manual track over the speech-recognition one. That rule lives in prepublish-extension/src/content/youtube-main.js.

The pre-roll wait

A pre-roll ad owns the player, and the caption track list stays empty until the ad ends. Measured on 18 and 19 September 2026, a cold pull took 17 to 28 seconds with a pre-roll on an active tab. On a hidden background tab the same pull took 26 to 38 seconds. A pull where the caption URL had already been captured took 1.4 seconds. No extension avoids the wait, because there is no track to read until the ad releases the player. Tools that open a hidden tab for a video you are not watching pay the longest version of it.

The proof-of-origin token

YouTube serves caption bodies only to requests carrying a proof-of-origin token minted inside the player. Fetching the base URL out of ytInitialPlayerResponse returned HTTP 200 with a zero-length body on 18 September 2026. The same request under a HeadlessChrome user agent also returned a zero-length body, while a normal Chrome user agent returned the full JSON3 payload. That is why extension extractors inject into the page rather than calling the caption URL from a background script, and why server-side tools such as yt-dlp need browser TLS impersonation instead of a plain HTTP client. Without curl_cffi, yt-dlp falls back to a client whose subtitles need a token and returns no caption characters at all, measured on 19 September 2026.

Limits of this comparison

The table is a snapshot. Store user counts move, ratings change with every review, and one listing here has not been updated since November 2025 while another was updated the day before this was written. Prices are list prices on the day checked; nine rows say unverified because the vendor page did not render a price in the fetch used.

Only one cell in the behaviour table comes from a policy that describes sending content to an AI provider. That is a statement about what vendors publish, not evidence that the other tools keep text on your device. Absence of a description is not a guarantee of local processing, and a store disclosure that lists a category such as user activity does not say what the extension does with the caption text it reads.