My upload was rejected.

The file must be a real JPG, PNG or WebP under 2 MB and at least 100×50 pixels. Renaming a file to .jpg does not work — the actual contents are checked. Re-export from your image editor and try again.

My YouTube link didn't work.

The video needs to be public and still exist — private, deleted, or age-restricted videos can't be fetched. Paste the full URL from the address bar or the Share button, or just the 11-character video ID; playlist and channel links aren't supported, only a single video.

Signed out, the limit is 3 analyses per day, counted per IP address, so another browser on the same connection will not reset it. With a free account it is 15 a month, and at most 5 in one day. Daily limits reset at midnight UTC, the monthly one on the 1st of the month (UTC). No paid plan is on sale yet.

The AI misread what my video is about.

That is a finding, not a bug. The AI only sees what a viewer sees: your thumbnail and title. If it drew the wrong conclusion, most of your audience will too — treat it as the first thing to fix.

I got no alternative titles.

A suggestion longer than 100 characters, or one that repeats your title or another suggestion, is dropped. If none is left, run the analysis again.

My score dropped after I made an improvement.

Check the clickbait risk factor. Changes that sharpen a hook often raise the promise beyond what the video delivers, and that penalty applies to the whole score rather than to one factor.

History only records analyses you run while signed in. Anything you ran as a guest was never attached to an account and cannot be recovered.

I left the page during an analysis.

Leaving does not cancel it: the analysis finishes and counts toward your allowance. Signed in, its result is in your history. Signed out, nothing keeps it for you, so stay on the page until the result appears. While an analysis runs, a link on the site asks before it takes you away.

Guide

User Guide

Everything the tool does, what each number means, and how to turn a score into a better thumbnail and title.

Quick start

An analysis usually takes under half a minute. You do not need an account, and you do not need to pick a category — the AI works that out from what you submit.

01 Add your thumbnail
Drag and drop the image, click to browse, or paste it from your clipboard with Ctrl+V — upload the real thumbnail you plan to publish, not a frame from the video, since the analysis reacts to text overlays, crops, and framing that only exist in the finished image. Or switch to "YouTube link" and paste a public video's URL instead: we fetch its real thumbnail directly from YouTube, so you upload nothing. Once the image is in, the form also shows it very small, smaller than YouTube shows it anywhere we measured: if the text reads there, it reads in the feed. To see it where YouTube shows it, in search results, a channel's grid, the suggested videos and on a phone, with your title and the length badge, without running an analysis, open the Thumbnail Preview from the menu.
02 Enter your title
Paste the exact title you intend to publish, including capitalisation and punctuation — the scoring reads tone and phrasing, so a draft written in shorthand will score differently from the version viewers will actually see. This step is skippable when you used a YouTube link: leave it blank and we use the video's own title.
03 Run the analysis
Press Analyze. The AI reads the thumbnail and title together as a single impression — the same way a viewer meets them in their feed — and returns a score out of 100 with a full breakdown.
From the form, Ctrl+Enter (⌘+Enter on a Mac) runs it too.

What you can submit

Inputs are validated before anything reaches the AI. Files are checked by their actual bytes, not their extension, and re-encoded server-side.

Thumbnail: JPG, PNG or WebP · up to 2 MB · at least 100×50 px — or paste a public YouTube video link instead and skip the upload
Title: 5–100 characters · no length scores better by itself: put the hook in the first words, since feeds can cut the end · optional when you paste a YouTube link — we use the video's own title
Account: Not needed to analyze · needed to keep history and to run more analyses a day
Daily limit: 3 analyses per day signed out · 15 per month with a free account, at most 5 in one day

How the score is calculated

The global score is not an average of the twelve factors. It follows the two things YouTube measures in sequence, whether an impression converts to a click and whether that click turns into watch time, and scores the part of each that the title and thumbnail control. A package has to succeed at both.

CTR layer — will the impression earn a click?

Everything visible before the click: how readable the thumbnail is at feed size, how strong the title is, and the psychological triggers that make scrolling past feel uncomfortable. Title strength carries the most weight here, because the title is the hook a creator can rewrite most directly.

Satisfaction layer — is the promise clear enough to keep?

The packaging's share of what happens after the click. Promise clarity dominates this layer: a viewer who cannot tell what they are going to get is more likely to leave early, and a video that loses viewers is promoted less. Coherence and emotional resonance make up the rest. The analysis reads the title and thumbnail, never the video, so it cannot tell whether the video keeps the promise.

Why the two layers are multiplied, not averaged

The two layer scores are combined with a geometric mean rather than a simple average. This is deliberate: a great title attached to a misleading thumbnail cannot average its way to a good score. One weak layer drags the whole result down, which mirrors how the algorithm treats a package that wins clicks but loses viewers.

The clickbait multiplier

Clickbait risk is not a factor that gets averaged in — it is a penalty applied to the combined result. Mild hyperbole barely registers. Severe overpromising is heavily punished, because YouTube detects it through watch-time drop-off and suppresses the video regardless of how many clicks the thumbnail earned.

Score bands and grades

Every result carries both a letter grade and a finer-grained band label. The bands are more granular than the grades, so use them when you are comparing two versions that land in the same letter.

Score	Band	Grade	What to do about it
90–100	Viral Potential	A	Publish it. Further tweaking is more likely to hurt than help.
75–89	Strong Appeal	A–B	Strong package. Worth one focused pass on the weakest single factor, then ship.
60–74	Good Baseline	B–C	Solid but unremarkable. This is where the alternative titles usually pay off most.
45–59	Room to Improve	C–D	Something specific is holding it back. Work the two lowest factors before republishing.
25–44	Needs Work	D–F	Structural problems, not polish problems. Rethink the concept rather than editing details.
0–24	Low Performer	F	Not competitive in a feed. Start over with a different angle on the same video.

The twelve factors

Each factor is scored 0–100 on its own. The groups below show which layer each factor feeds, and which one counts against your score.

CTR signals — earning the click

Thumbnail Readability

Text visibility, contrast, clutter level, subject clarity on mobile.

Title Strength

Length, promise, precision, absence of filler words, audience fit.

Cliffhanger

Unresolved narrative tension that makes not clicking feel uncomfortable.

Curiosity

Narrative tension, open loops, before/after contrast, implicit question.

Withheld Answer

The title or image points to an answer, a method or a result and holds it back.

FOMO

Fear of missing out — social proof that others are already benefiting.

Urgency

Time-bound or now-or-never framing that pressures immediate action.

Rarity

Exclusivity and scarcity signals that make content feel privileged or secret.

Satisfaction signals — keeping the viewer

Promise Clarity

Viewer immediately understands what they will get from the video.

Title / Thumbnail Coherence

Image and title complement each other without redundancy.

Emotion

Facial expression, colour energy, tone aligned with the content.

Risk signal — applied as a penalty

Clickbait Risk

Higher means more risk. Exaggerated claims reduce your overall score.

Lower is better — this one subtracts from your score.

Reading your results

The result opens with what to do next. The detail sits underneath, folded, for when you want it.

Open as soon as the result appears

Your score and its band
A score out of 100, its letter grade and its band, which says what to do with it (see "Score bands and grades").
Fix these first
The changes most likely to raise the score, in order, each tied to the factor it targets and what that factor measures. Start with the first.
Apply one fix, then test again
Your thumbnail stays loaded: change the title or the image and run the analysis again. You can also start from a suggested title.
Your 3 weakest factors
Why the score is what it is: the 3 lowest factors, and what each one measures.
Under them, a link to the article that teaches how to raise the weakest, when there is one in your language. It opens in a new tab, so your result stays where it is.

Folded until you open them

All 12 factors and the CTR potential
Every factor's reading. The CTR potential says how hard the thumbnail and title, seen together in the feed, push a viewer to click, with the click-through range YouTube's published benchmark gives for that band. It is indicative only: your audience, your niche and where YouTube shows the video decide the rest.
Alternative Titles
Rewritten titles, up to five. A second reading from the model compares each one with yours and orders them, and the ones it ranks above your title are marked. Copy one, or place it in the form and analyze it with your thumbnail.
Thumbnail Text Ideas
Short overlay phrases built to stay readable at feed size. These are meant to be added onto the image, not used as titles — keep them to a few words so they survive being shrunk on mobile.
AI Video Context
One sentence on what the AI believes your video is about, read only from the thumbnail and title. If it does not match your video, the package is miscommunicating: fix that before anything else.

On your second version

Test a new version in the same visit, keeping the thumbnail or the title, or after choosing "Test a new version", and the result starts with the previous version's score and the change in points. A different thumbnail with a different title is another video, and is not compared. No account needed.

Under it, the 3 factors that moved most, largest change first.

If you are following a reading path from the blog, the result then offers the next article of your path.

Sharing a result

The share buttons under the score post your grade and title to social platforms, or copy the summary to your clipboard. Nothing is published without you pressing one of them.

Analysis history

Sign in with Google or GitHub to keep a record of what you have tested. An account is needed for history, and it also raises how many analyses you can run each day.

Each analysis is kept 30 days, and only your last 20: older ones are deleted automatically.
Each entry stores the score breakdown, the title, and a small thumbnail preview.
You can delete any entry yourself, and deletion is immediate.

The habit that works: analyze your first idea, apply the first fix, analyze again in the same visit, and read which factors moved. History is for coming back to a video another day; the comparison itself happens on the result.

Your images and privacy

Your thumbnail is sent to the AI for analysis and is not kept on our servers afterwards.
If you are signed in, a small preview image and the score are saved to your history — and only to your history.
Uploads are validated by their actual file signature and re-encoded before analysis, which strips anything hidden inside the original file.
With a YouTube link you upload nothing: our server fetches the video's public thumbnail from YouTube for the analysis, the preview you see loads from YouTube's own servers, and the image stays credited to its creator. You can analyze your own videos or public videos you're researching; see the Terms of Service for what that covers.

Full details are in the Privacy Policy.

Languages

The interface is available in 5 languages. The analysis is written in the language of your title, so a title in one language is judged by that language's conventions rather than translated first; when the title's language cannot be told, the analysis uses the language you are browsing in.

Getting more out of it

01
Change one thing at a time. If you rewrite the title and swap the image together, the score moves but you learn nothing about which change caused it.
02
Start with the first change under Fix these first, and test again before touching anything else.
03
Treat the score as a comparison tool, not a verdict. What matters is whether version B beats version A, not whether either hits an arbitrary target.
04
Test the thumbnail at the size viewers see it. Shrink it on your screen — if the text stops being readable, the readability factor is telling you something real.
05
Do not chase a perfect clickbait risk of zero. Some tension is what earns clicks; the penalty only bites when the promise stops being honest.
06
Take the alternative titles as raw material, not finished copy. Copy the one closest to your voice and edit it — a title that does not sound like you will underperform with your own audience.

Troubleshooting

My upload was rejected.: The file must be a real JPG, PNG or WebP under 2 MB and at least 100×50 pixels. Renaming a file to .jpg does not work — the actual contents are checked. Re-export from your image editor and try again.
My YouTube link didn't work.: The video needs to be public and still exist — private, deleted, or age-restricted videos can't be fetched. Paste the full URL from the address bar or the Share button, or just the 11-character video ID; playlist and channel links aren't supported, only a single video.
I hit a limit.: Signed out, the limit is 3 analyses per day, counted per IP address, so another browser on the same connection will not reset it. With a free account it is 15 a month, and at most 5 in one day. Daily limits reset at midnight UTC, the monthly one on the 1st of the month (UTC). No paid plan is on sale yet.
The AI misread what my video is about.: That is a finding, not a bug. The AI only sees what a viewer sees: your thumbnail and title. If it drew the wrong conclusion, most of your audience will too — treat it as the first thing to fix.
I got no alternative titles.: A suggestion longer than 100 characters, or one that repeats your title or another suggestion, is dropped. If none is left, run the analysis again.
My score dropped after I made an improvement.: Check the clickbait risk factor. Changes that sharpen a hook often raise the promise beyond what the video delivers, and that penalty applies to the whole score rather than to one factor.
My history is empty.: History only records analyses you run while signed in. Anything you ran as a guest was never attached to an account and cannot be recovered.
I left the page during an analysis.: Leaving does not cancel it: the analysis finishes and counts toward your allowance. Signed in, its result is in your history. Signed out, nothing keeps it for you, so stay on the page until the result appears. While an analysis runs, a link on the site asks before it takes you away.

Learn one factor at a time

Where to go from here, before your next test.

Ready to test a thumbnail?

No account, no setup. Upload an image and a title; the full breakdown usually takes under half a minute.

Open the analyzer Read the blog