Summary
Summarize Long PDFs
Turn long reports, papers and technical documents into clear key takeaways without reading every page.
Summarize a PDFFree text tool
Free Reading Time and Playback Speed Calculator
Estimate reading time from your text and compare video watch time at a chosen playback speed. Free, no AI, no signup: all calculations run in your browser.
Private by default. Your text is analysed locally in your browser and is not uploaded.
Choose your pace
Reading time: 0.08 min
Video watch time: 40 min
Time saved: 20 min
Your results
18Words
<1 minReading time
118Characters
101Without spaces
2Sentences
1Paragraphs
~30Estimated tokens
<1 minSpeaking time
Sentences and times are estimates. Token counts vary by model and tokenizer; this is a quick estimate.
Text Case
Quick answer
Plan reading time at your own pace
Paste a chapter, article or transcript, then enter a reading speed in words per minute. Divide the word count by that speed to estimate the minutes needed. At 200 words per minute, a 1,000-word passage takes five minutes. This is a planning estimate: technical terms, unfamiliar ideas, diagrams and note-taking can make the same passage take longer. Use a pace measured from your own reading when accuracy matters.
Calculate video watch time
Enter the original duration as minutes:seconds or hours:minutes:seconds. Choose a playback speed to divide that duration by the speed multiplier. A one-hour video at 1.5× takes 40 minutes without pauses, saving 20 minutes. The result describes playback time only. Rewinding, advertisements, exercises and breaks add time, and faster playback does not guarantee the same comprehension.
Compare tasks rather than promising time saved
Reading a transcript and watching a video are different activities. A transcript may omit a chart, demonstration, slide or visual qualification. A short summary may omit examples that matter to your question. Use the two estimates to decide where to start, then return to the original source when the wording or demonstration is important. Leave additional time to check claims and write your own notes.
Use a practical study example
For a 2,000-word chapter at 200 words per minute, reserve at least ten minutes for a first pass. Add a separate block for questions and recall practice. For a 30-minute lecture at 1.25×, playback takes 24 minutes before pauses. If you only need one concept, locate its timestamp instead of speeding through the entire recording. The word counter can help you measure a shorter excerpt before you plan the next session.
Frequently asked questions
What reading speed should I use?
Use your own measured pace. The starting value of 238 words per minute is only an estimate; difficult material and note-taking often require more time.
Does this download or watch a YouTube video?
No. Enter the duration yourself. The calculator makes no request to YouTube.
Does faster playback include pauses?
No. The result assumes uninterrupted playback at your selected speed.
Related reading and next steps
Related Free Tools
KnowledgePilot
Go beyond basic document tools
Finding information is only the first step. KnowledgePilot helps you understand documents, ask questions, and verify every answer against the original source.
Productivity Tools
Video Summarizer with YouTube Timestamps: AI YouTube Summary
Try an AI video summarizer that gives you a YouTube summary with clickable YouTube timestamps, so you can check every point against the original video.
Productivity Tools
Document Summarizer: Summarize and Search PDFs With AI
Use an AI document summarizer to summarize PDFs, search documents, ask questions and find key information without reading every page.
Source
Jump to the Original Passage
Follow citations back to the relevant section and see the supporting text in context.
Explore document analysisTry KnowledgePilot Free
40 free credits · No credit card required