Free AI Detector: No Word Limit, No Signup, Runs in Browser Guide 2026

Runs Entirely in Your Browser

Leap's free AI detector processes your text locally, so nothing has to travel to a server and your text never leaves your browser. There is no signup required to use it.

Check sensitive drafts without uploading them anywhere.

0 to 100 AI Score With Sentence-Level Breakdown

Paste at least 40 words and press Check text to get a 0 to 100 score plus the sentences that read most like AI. Open Every sentence to see each sentence's score in reading order.

Spot exactly which passages read machine-written instead of guessing from one document-wide number.

Five Style Signals Behind the Score

The score combines five signals with weights: how much sentence length varies (even rhythm), stock phrases like "in today's fast-paced world" and "delve into" counted per 100 words, hedging and transitions such as "furthermore" and "moreover", em dashes or double hyphens, and repeated longer words.

Understand why a draft scored the way it did, not just what the number is.

No Word Limit, No Signup

There is no word limit and no signup. A full paragraph or more gives the signals more to read, while short inputs under about 50 words are hard for every detector because there isn't enough signal to separate styles.

Check essays, posts or emails of any length without creating an account.

Style-Based Detection, Not Perplexity

Leap doesn't run a language model, so it doesn't measure perplexity, the predictability of each word, which detectors like GPTZero use. That keeps it fast and private, and it means it reads style rather than authorship.

Know the detector's approach and its limits before relying on a single score.

Example Text and Humanizer Follow-Up

No text handy? Try an example loads a paragraph written the way chatbots tend to write so you can see what a high score looks like. Rewrite the sentences that read most machine-written, or run the draft through the AI humanizer and check it again.

Learn what a high score looks like and revise flagged sentences in one loop.

• No word limit and no signupThe detector is described as a free AI checker with no word limit and no signup. You can paste an essay, post or email and get a 0 to 100 score along with the sentences that read most like AI.
• Runs in your browser, text never leaves itThe tool runs in your browser, so your text never leaves it. The score, the sentences that stand out and the five signals appear at once because nothing has to travel to a server.
• Sentence-level scoring and five signalsEach sentence gets its own score from the same signals, and you can open Every sentence to see each sentence's score in reading order. The score is a weighted mix of five signals: even rhythm, stock phrases, hedging and transitions, em dashes, and repeated words.
• Fast and private by designLeap doesn't run a language model, so it doesn't measure perplexity. That keeps it fast and private, and it means it reads style rather than authorship.

• Score is a signal, not proofThe score is a signal, not proof. A 0 to 29 score reads human but doesn't prove a person wrote it, and an 85 to 100 score is strongly AI but still a signal, not proof.
• Short inputs are hard for every detectorShort inputs are hard for every detector. Under about 50 words there isn't enough signal to separate styles, and false positives climb. The tool recommends pasting at least 40 words, and a full paragraph or more gives the signals more to read.
• Simpler than commercial detectorsLeap's detector is simpler than the commercial ones, so treat its score as a first read. For a high-stakes question, check with a second detector as well.
• Mixed documents and false positivesMixed documents are common: a student who drafts with ChatGPT and then edits, or an editor who runs a human draft through AI for polish. A single document score smears those together, which is why sentence-level output helps. Some writers get flagged more than others; a 2023 Stanford study found that seven detectors labeled, on average, 61% of TOEFL essays by non-native English speakers as AI-written.

Freelance content verification

Freelancers can self-check their work before submission to ensure it passes client AI detection requirements. This reduces revision cycles and maintains client trust. Teams using Grammarly for grammar can add this tool as an AI check step.

Small business content publishing

Small businesses with limited budgets can screen blog posts and website copy for AI-generated content without investing in paid tools. This helps maintain content authenticity standards.

Educational preliminary screening

Educators can perform quick initial checks on student submissions to identify potential AI-generated work before more detailed investigation.

Agency quality control

Content agencies can use the tool as a rapid pre-check before routing content through more comprehensive plagiarism and AI detection workflows.

Navigate to the Free AI Content Detector page on the TryLeap website.

Copy the text you want to analyze and paste it into the provided text area.

Click the scan button and wait for the results to appear (typically 2-5 seconds).

Review the AI probability score and decide whether to flag the content for further review.