# Free presentation tools Slideso publishes 9 free presentation tools: converters (PDF to PPT, PPT to PDF, PPT to JPG, images to PPT, speaker-notes extraction) and planning checks (slide count, contrast, pacing, dimensions). None require an account. Most run entirely in the reader's browser; the two PowerPoint conversions that need a real renderer convert in memory on the server and delete the file immediately. ### How many slides do you need for a presentation? A 10-minute presentation typically needs 10 to 12 slides, at roughly 50 seconds per slide. Pitches run faster, near 30 seconds a slide; training sessions run slower, near 90. The tighter constraint is words: a slide should carry about 18% of what is spoken over it, or the audience reads instead of listening. [Slide Count Calculator](https://slideso.com/tools/slide-count-calculator) — Work out how many slides a talk of any length needs — and how many words each one can carry. ### What contrast ratio do presentation slides need? Presentation body text needs a contrast ratio of at least 4.5:1 against its background, and large headings and non-text marks such as icons, rules and chart bars need at least 3:1. These are the WCAG 2.2 AA thresholds. Palettes most often fail on tinted surfaces rather than on the slide itself. [Presentation Contrast Checker](https://slideso.com/tools/contrast-checker) — Check every colour pairing a slide actually uses — including the ones on cards, where palettes usually fail. ### How do you use a timer to rehearse a presentation? Set the timer to your speaking slot and enter your slide count, then rehearse from the start without stopping. Dividing the slot by the slide count gives a target pace, so comparing the slide you are on with the slide you should be on shows whether you are ahead or behind while there is still time to correct. [Presentation Timer](https://slideso.com/tools/presentation-timer) — Rehearse against the clock, and see which slide you should be on right now. ### What size is a PowerPoint slide? The default PowerPoint and Google Slides size is 16:9 widescreen, which is 13.333 by 7.5 inches, or 33.87 by 19.05 centimetres. The older 4:3 standard is 10 by 7.5 inches. Exported at 1080p, a 16:9 slide is 1920 by 1080 pixels; social carousels use 1080 by 1350 for portrait and 1080 by 1080 for square. [Slide Size Guide](https://slideso.com/tools/slide-size-guide) — Every standard slide dimension in pixels, inches and centimetres — plus which to use where. ### How do you convert a PDF to PowerPoint for free? A PDF converts to PowerPoint by rendering each page and placing it on its own 16:9 slide, producing a .pptx that opens anywhere PowerPoint files do. The conversion can run entirely in a web browser, so the document never has to be uploaded — which matters for contracts, reports, and anything confidential. [PDF to PPT Converter](https://slideso.com/tools/pdf-to-ppt) — Turn a PDF into a PowerPoint deck in your browser — each page becomes a slide, and the file never leaves your device. ### How do you convert a PowerPoint to PDF for free? A PowerPoint converts to PDF by rendering every slide at its exact size into a fixed-layout document, so fonts, images, and positioning stop depending on the viewer's software. A faithful conversion uses a real presentation renderer; the resulting PDF is what to send when the deck must look identical everywhere. [PPT to PDF Converter](https://slideso.com/tools/ppt-to-pdf) — Convert PowerPoint to a print-ready PDF that looks the same on every device — free, no account, file deleted after conversion. ### How do you convert PowerPoint slides to JPG images? PowerPoint slides convert to images by rendering the deck slide-by-slide and exporting each one as a JPG or PNG, typically 1,920 pixels wide for full-HD sharpness. One image per slide is the format social posts, thumbnails, and documents need — a multi-slide deck exports as a zip with the slides numbered in order. [PPT to JPG Converter](https://slideso.com/tools/ppt-to-jpg) — Export every PowerPoint slide as a sharp JPG or PNG image — one file per slide, zipped and ready to post. ### How do you turn images into a PowerPoint slideshow? Images become a PowerPoint slideshow by placing each photo on its own 16:9 slide, scaled to fit without cropping or distortion. A JPG, PNG, or WebP set converts to a .pptx in the browser in seconds — the standard way to build a photo slideshow, portfolio deck, or image archive that opens in any presentation app. [Image to PPT Converter](https://slideso.com/tools/jpg-to-ppt) — Turn a folder of images into a PowerPoint slideshow — one photo per slide, fitted and centred, built in your browser. ### How do you extract all speaker notes from a PowerPoint? Speaker notes live inside a .pptx file as XML — one notes page per slide — so they can be extracted directly, without PowerPoint installed. Reading the file in the browser produces a clean, slide-numbered script of every note, ready to copy into a teleprompter, a handout, or an AI tool for rewriting. [Speaker Notes Extractor](https://slideso.com/tools/extract-ppt-notes) — Pull every speaker note out of a .pptx into clean, copyable text — without opening PowerPoint. --- Source page: https://slideso.com/tools Part of Slideso, an AI presentation maker: https://slideso.com/ This markdown may be quoted and cited. Attribute to "Slideso".