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Sequence{{ imageCountLabel }} Slide{{ slideSizeLabel }} Local only
2–12 images · 12 MB and 16 MP each · 60 MB total · PNG, JPEG, or WebP
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{{ readingImages ? 'Checking file signatures, dimensions, and memory limits…' : 'or press to browse local files' }}
{{ formatBytes(totalImageBytes) }} selected
Use the sample to inspect the complete verified-PPTX workflow without choosing personal images.
Slide sequence

Reorder images and edit optional captions before packaging.

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  1. {{ image.name }}{{ image.width }} × {{ image.height }} px · {{ formatBytes(image.bytes) }}
    {{ image.caption.length }}/120
Choose the aspect ratio required by the display or editing workflow.
The verified crop profile reports how much source area Fill removes.
Filenames seed the captions and each slide can be edited above.
High suits large displays; Compact is faster to share.
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Use a margin for projectors or layouts that need breathing room.
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White is the neutral default for slide margins and transparent pixels.
Verified PowerPoint deck

The downloadable file is the exact package checked below.

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Review before presenting. {{ warningSummary }}

No material crop or long-caption warnings were found. Images and captions remain separate editable slide objects.

The chart renderer is unavailable. The same crop values remain available in the slide ledger.

SlideSourcePlacementCropCaptionReviewCopy
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PDF to File Converter Convert a PDF locally into editable text or page-faithful images with page-range checks, document handoffs and no source-file upload.
File to PDF Converter Turn images and text sources into local PDF output while preflighting Office files for renderer needs, layout risks and fidelity limits.
Image Resizer Resize one image locally, compare fit or crop geometry, and tune format quality against a file-size target before downloading.
Image Compressor Compress one image locally in your browser, compare size and visual quality, then download a resized or reformatted copy with metadata controls.

An image slideshow turns a sequence of pictures into pages with a fixed aspect ratio. The source order becomes the slide order, while the relationship between each image and the slide decides whether the whole picture remains visible or some edges are cropped. That choice matters before captions, transitions, or speaker notes are added later in a presentation editor.

Slide proportions should match the place where the deck will be shown. Widescreen 16:9 suits most current displays and meeting software. Standard 4:3 fits older projectors and some legacy decks. Portrait 9:16 is useful for vertical screens and phone-first presentations. Changing the slide size later can shift or rescale placed images, so choosing it before layout reduces rework.

PlacementWhat remains visibleBest fitTradeoff
FitThe complete imageDocuments, screenshots, diagrams, artwork, and photos with edge detailUnused slide area may show the background.
FillThe entire image area is coveredFull-bleed photography and consistent visual rhythmSource edges are cropped when aspect ratios differ.

Safe margins create breathing room for projection, framing, and later editing. Captions need their own space, so enabling them reduces the area available to the image. A filename can supply a useful starting caption, but filenames written for storage often need editing before they read well to an audience.

Image quality and presentation quality are related but not identical. More pixels help on large displays, while excessive image resolution can make a deck slow to open and share. Crop percentage, caption length, contrast, sequence, and visible detail deserve review in the actual presentation software before the slideshow is shown.

How to Use This Tool:

Choose the delivery screen first, then arrange and caption the images in the order the audience should see them.

  1. Select 2 to 12 PNG, JPEG, or WebP images. Each may be up to 12 MB and 16 megapixels, with a 60 MB combined limit.
  2. Reorder the images and edit any filename-derived captions. Captions may contain up to 120 characters, though text longer than 90 characters receives a review warning.
  3. Choose Slide size, then set Fit when every source edge matters or Fill for a full-bleed layout. Add a safe margin when projection or later design work needs space around the image.
  4. Choose whether to include editable captions, select high or compact image quality, and set the background used for margins and transparent pixels.
  5. Create the slideshow and inspect the Crop profile and slide ledger. Any slide that loses at least 5% of its source area or contains a long caption should be reviewed before download.

Interpreting Results:

The crop percentage measures source area removed by Fill placement. Zero means the full image is visible. A warning at 5% or more is a prompt to inspect the slide, not a claim that the crop is unacceptable. A centered portrait may tolerate a large side crop, while a screenshot can become misleading after a much smaller crop removes labels or controls.

Caption contrast reports the stronger black-or-white text contrast against the chosen background. It does not test contrast against the image itself because captions occupy a separate area. Open the PPTX and check line wrapping, reading order, image sharpness, and any later theme changes in the presentation editor that will be used.

Technical Details:

Each slide reserves the selected margin on all sides. When captions are enabled, a 0.65-inch caption box and a 0.12-inch gap are removed from the image area. Fit and Fill then compare the source aspect ratio with that remaining target rectangle.

Formula Core:

Fit uses the smaller scale needed to keep both source dimensions inside the target. Fill uses the larger scale needed to cover both target dimensions:

sfit=min(WtWs,HtHs) sfill=max(WtWs,HtHs)

W and H are width and height; subscripts s and t mean source and target. Fit centers the scaled image and leaves background where one dimension is short. Fill covers the target and reports the fraction of source area outside the crop.

Transformation Core:

DecisionExact behavior
Slide size16:9 is 13.333 × 7.5 inches, 4:3 is 10 × 7.5 inches, and portrait 9:16 is 7.5 × 13.333 inches.
Image qualityHigh uses a 3,200 px maximum side at 92% JPEG quality; Compact uses 1,920 px at 82%.
Crop reviewFill placement raises a slide warning when the calculated cropped source area is at least 5%.
Caption reviewCaptions longer than 90 characters receive a warning; input longer than 120 characters is rejected.
Caption colorBlack or white is chosen according to which gives the higher WCAG contrast ratio against the slide background.

Layout values are rounded to four decimal places in the plan. The deck is then reopened as a presentation package to verify slide count, page size, media parts, captions, and image relationships. These checks establish package consistency, not how every presentation program will paginate text or render color.

Privacy Notes:

Selected images are read and packaged in the browser rather than uploaded for conversion. The finished PPTX can still contain sensitive imagery and captions, so inspect the deck and its file properties before sharing it.