Drag & drop your files here
Max 20 files • Max file size: 200MB
Accepted formats: .pptx, .pptm, .ppsx, .potx, .odp
Multi-level optimization targeting media, layouts, and XML
PowerPoint file compression reduces presentation size by optimizing embedded media, removing unused template components, and recompressing internal file structure. Unlike older .ppt files (binary format), modern .pptx files are ZIP archives containing XML files for slides, images/videos in a media folder, and slide layouts/masters/themes that define presentation design. Compression targets three main areas: embedded images and videos (often 80% of file size), unused slide layouts from corporate templates (10-20MB of bloat), and XML metadata that accumulates during editing.
PowerPoint files with embedded videos routinely exceed 100-200MB, far beyond email attachment limits (typically 25MB). Corporate templates include 20-30 slide layouts, but presentations typically use only 2-4, leaving 15MB+ of unused design templates inside the file. Unlike Microsoft's manual methods (documentation ranks #1 but requires multiple steps: compress images within PowerPoint, compress videos via File → Info → Compress Media, remove cropped areas), this tool performs 12-step automated optimization in your browser using JSZip v3.10.1 + browser-image-compression v2.0.2.
Template-based presentations (corporate, academic): 40-70% reduction from unused layout removal alone. Image-heavy decks (marketing, portfolios): 50-70% from image optimization. Clean custom decks with minimal layouts: 20-40% from image/XML optimization. Video-heavy presentations require PowerPoint's Compress Media feature first, then this tool for images/layouts (two-step workflow).
Automated 12-step optimization—no PowerPoint software needed
Microsoft's official documentation provides manual methods requiring PowerPoint desktop software: compress images in PowerPoint (Picture Format → Compress Pictures for each image), compress videos (File → Info → Compress Media), remove cropped areas. These require multiple manual steps per file.
This tool automates the entire process in your browser—no software, no manual image selection, all 12 optimization techniques run automatically.
Drag and drop PowerPoint files onto the page, or click "Choose PowerPoint Files" to browse. Up to 20 presentations at once (200MB maximum per file). Accepts PPT, PPTX, PPSX, PPS, PPTM formats. Sequential batch processing. Files never leave your browser—processed locally using JSZip and browser-image-compression.
Four presets: High Quality (92% image quality, 2400px, 20-40% reduction, print/final presentations), Balanced (80%, 1920px, 40-60%, recommended default—cleans XML, preserves all content), Smaller File (70%, 1200px, 50-70%, removes unused slide layouts/masters/themes—ideal for template-based corporate presentations), Maximum (55%, 800px, 60-70%, removes speaker notes, hidden slides, comments, handout master—for email/messaging). Smaller File preset removes unused layouts automatically—often saves 10-20MB from corporate templates with 25 layouts where only 3 are used.
Processing takes 5-15 seconds for 30-slide presentation, 20-60 seconds for 100+ slide decks with many images. Download individually (files get "_compressed" suffix, e.g., quarterly-review_compressed.pptx) or as ZIP for batches. Powered by JSZip v3.10.1 (ZIP extraction/repacking) + browser-image-compression v2.0.2 (image optimization from CDN). Sequential processing on main thread (PowerPoint files are complex XML structures requiring careful memory management). "Never return larger" guarantee—if compression produces bigger file, original kept.
Corporate templates waste 10-20MB on layouts you'll never use
Corporate PowerPoint templates include 20-35 pre-designed slide layouts (Title, Title+Content, Two Column, Comparison, Section Header, etc.) to provide design flexibility. In practice, presentations use 2-4 layouts. A 10-slide quarterly review might use "Title" (1 slide), "Title+Content" (8 slides), and "Blank" (1 slide)—leaving 22-32 unused layouts embedded in the file. Each unused layout consists of 10-50KB of XML plus references to background images, logos, and theme files. Across 25 unused layouts, this adds 5-20MB of bloat to a 30MB presentation.
Tool unzips the .pptx file (PPTX is ZIP archive), scans ppt/slides/_rels/slide*.xml.rels files to find which slide layouts are referenced by actual slides. If slides use layouts 1, 2, and 7, the tool marks layouts 3-6 and 8-25 for removal. Deletes ppt/slideLayouts/slideLayout*.xml files for unused layouts and their _rels relationship files. Critical step: Updates ppt/slideMasters/slideMaster*.xml to remove <p:sldLayoutId> entries for deleted layouts and updates master's .rels file to remove broken relationship references. This prevents PowerPoint from showing "This presentation needs repair" when opening. Finally, updates [Content_Types].xml to remove MIME type entries for deleted files, then rezips entire structure with DEFLATE level 9 compression. This 6-step algorithm is why the tool safely removes layouts without corrupting the file—unlike manual deletion, which breaks internal references.
Saves 8-15MB (30-50% of original file size). Example: 28MB quarterly review deck becomes 15MB after removing 22 unused layouts.
Saves 5-10MB. Example: 22MB research presentation with only Title and Content layouts becomes 14MB.
Saves 0MB (all layouts in use, nothing to remove). Tool detects this and skips layout removal, focusing on image/XML optimization instead.
Videos are #1 size contributor—requires two-step workflow
Embedded videos are the single largest contributor to PowerPoint file size—a 5-minute 1080p video can add 200-500MB to a presentation. Reddit discussions highlight "compress large PPT with recorded video" as a major PowerPoint pain point. Presentations with webinar recordings or screen captures routinely exceed 1GB. This tool compresses the .pptx file structure (images, XML, layouts), but videos inside PowerPoint files must be compressed separately using PowerPoint's built-in "Compress Media" feature (File → Info → Compress Media → choose Full HD/HD/Standard quality).
Images typically account for 40-60% of file size in presentations without embedded videos. High-resolution photos from cameras (4000×3000px, 5-10MB each) remain at full size unless compressed. This tool automatically compresses all embedded images based on selected preset: High Quality (92%, 2400px max), Balanced (80%, 1920px), Smaller File (70%, 1200px), Maximum (55%, 800px). Compression uses browser-image-compression v2.0.2 library with quality-based JPEG encoding and PNG optimization. Images resized to max dimensions (e.g., 1920px for Balanced) and recompressed, reducing a 5MB photo to 300-800KB without visible quality loss on screen. All image compression happens in your browser—images extracted from .pptx ZIP, compressed individually, then repacked.
For presentations with embedded videos: First use PowerPoint's "Compress Media" feature to reduce videos to HD quality, save the file, then use this tool to compress images and remove unused layouts. This two-step approach can reduce a 300MB presentation to 20-40MB: video compression (300MB → 80MB), then file compression (80MB → 25MB).
Email-ready presentations under 25MB
Attachments over 25 MB automatically converted to Google Drive links. Presentations designed for in-person delivery (100-200MB) fail to attach.
Varies by version. Corporate Outlook often lower (10-15 MB limit).
Smaller File and Maximum presets target email-friendly sizes. 50MB presentation compresses to 10-20MB, 100MB deck to 20-35MB.
Supporting PPTX, PPT, PPSX, PPS, PPTM
This tool compresses 5 PowerPoint formats: .pptx (PowerPoint 2007+), .ppt (PowerPoint 97-2003), .ppsx (PowerPoint Slide Show), .pps (Slide Show legacy), .pptm (macro-enabled). Maximum file size: 200MB per file. Batch processing supported—compress multiple presentations sequentially. Output format: Same as input. If you upload a .pptx, you download a compressed .pptx. If you upload a .ppt, you download a compressed .ppt.
Modern .pptx files (PowerPoint 2007+) are ZIP archives containing XML files, making them easier to compress (unzip → optimize components → rezip). Older .ppt files (PowerPoint 97-2003) use binary format. Tool processes .pptx directly; .ppt files may have limited optimization. For best results and maximum compression (unused layout removal, XML minification), use .pptx format. Save legacy .ppt files as .pptx in PowerPoint (File → Save As → PowerPoint Presentation .pptx).
Compressed presentations open in PowerPoint 2007+, PowerPoint for Mac, Google Slides, Keynote (with format conversion), and PowerPoint Online. All animations, transitions, embedded fonts, speaker notes (unless explicitly removed via Maximum preset), and content preserved. Smaller File preset removes unused layouts/masters/themes but preserves all slides and content.
100% browser-based processing with JSZip + browser-image-compression
This PowerPoint compressor runs entirely in your browser using JavaScript—files never leave your device. When you add a .pptx file, it's read into browser memory as ZIP archive (using JSZip v3.10.1), each component optimized (images compressed with browser-image-compression v2.0.2, XML minified, unused layouts removed), then repacked as new .pptx and downloaded. All processing happens on your computer's CPU in browser's main thread. No data transmitted to servers—our servers only deliver HTML page and JavaScript libraries. This architecture means: No file upload wait times, no cloud storage of presentations, works offline once page loads, safe for confidential/NDA-covered corporate presentations.
Proposals, sales presentations stay private
Quarterly reviews, forecasts never exposed
Lecture slides, course materials secured
Internal presentations never stored
Presentations with video protected
Private notes never transmitted
No POST endpoint in codebase. Files stay in browser memory only. JSZip extracts PPTX locally, optimizes, repacks. GDPR compliant by design—no data collection possible. Works offline after libraries load (cached in browser). Maximum preset strips metadata (author name, company, timestamps, revision count) for additional privacy.
Everything about compressing PowerPoint files
Add your .pptx file (drag-drop or click "Choose PowerPoint Files"), select Balanced preset for 40-60% reduction with excellent quality, then click Compress. Tool automatically compresses images, removes unused slide layouts, minifies XML, optimizes entire file structure. For presentations with embedded videos, first use PowerPoint's File → Info → Compress Media feature to reduce video size, then use this tool for images and layouts. Average savings: 30-70% depending on preset and content.
Yes. PowerPoint files (.ppt, .pptx) are highly compressible. Images can be resized and recompressed (typical savings: 40-60%), unused slide layouts removed (10-20MB savings for template-based presentations), and XML minified (3-8% savings). This tool performs 12 optimization techniques automatically. Average compression: 30-70% depending on content and preset. Template-based corporate presentations benefit most from unused layout removal.
Text, shapes, charts, animations, and transitions are ALWAYS preserved perfectly—these are vector/XML elements, not compressed. Image quality is adjustable via presets: High Quality (92%, near-lossless), Balanced (80%, screen-optimized), Smaller File (70%, good for sharing), Maximum (55%, minimal quality loss visible). Videos are not recompressed by this tool (use PowerPoint's Compress Media feature for videos). Choose Balanced or High Quality if visual quality critical.
YES—all animations and transitions are always preserved. These are XML-defined effects in ppt/slides/slide*.xml, not compressed. Only media (images/videos) may have quality reduction based on preset. Slide timings, entrance/exit effects, path animations, morphs, and all transition effects remain intact. Safe for pitch decks, educational presentations, and webinars where animations are critical. Even Maximum preset preserves animations.
Two options: (1) Compress the file below 25MB using Maximum or Smaller File preset (typical savings: 30-70%). (2) If file remains >25MB (common with high-quality videos), share via OneDrive/Google Drive link instead of attaching. For recurring scenarios, use PowerPoint's Compress Media feature for videos before using this file compression tool. Example workflow: 300MB presentation → 80MB (video compression) → 25MB (file compression).
Three main causes: (1) Embedded videos—a 5-minute 1080p video adds 200-500MB (LARGEST contributor). (2) High-resolution images—camera photos at 4000×3000px, 5-10MB each. (3) Unused slide layouts—corporate templates include 20-30 layouts but presentations use 2-4, wasting 10-20MB. This tool addresses #2 and #3. For #1 (videos), use PowerPoint's File → Info → Compress Media feature.
PowerPoint built-in method: Select picture → Picture Format → Compress Pictures → Choose quality (Print 220ppi / Screen 150ppi / Email 96ppi). Repeat for each image manually. OR use this tool: automatically compresses ALL images in entire presentation in one click—faster, easier. Our tool also includes unused layout removal, XML minification, and unnecessary file cleanup that PowerPoint's built-in feature doesn't do.
Videos require separate compression in PowerPoint: File → Info → Compress Media → choose Full HD (1080p), HD (720p), or Standard (480p). This reduces video size by 50-80%. Save the file, then use this tool to compress images and remove unused layouts. Example: 300MB presentation → 80MB (video compression in PowerPoint) → 25MB (file compression with this tool). Reddit users identify this as MAJOR PowerPoint pain point.
PowerPoint's "Compress Pictures" feature compresses individual images inside PowerPoint while editing (you must select each image). This tool compresses the entire .pptx file automatically (all images at once, unused layouts, XML, themes) without opening PowerPoint. Use PowerPoint's feature while building presentations; use this tool as final step before sharing/emailing the .pptx file. This tool also includes unused layout removal (10-20MB savings) that PowerPoint doesn't offer.
Use Smaller File or Maximum preset—specifically designed for email attachments. Targets under 10-20MB for reliable delivery (Gmail 25MB limit, Outlook 20MB, corporate often 10MB). Removes unused layouts (biggest savings for template-based presentations), compresses images (70% or 55% quality), cleans XML. If video-heavy, compress videos in PowerPoint first (File → Info → Compress Media), then use this tool.
Depends on preset. High Quality: nothing removed (only images compressed minimally). Balanced: printer settings, custom XML, XML comments/whitespace removed. Smaller File: unused slide layouts/masters/themes, notes master, handout master removed. Maximum: speaker notes, hidden slides, comments, metadata removed. All slides, text, shapes, animations, transitions ALWAYS preserved. Only template components and optional content removed based on preset.
This tool is 100% browser-based—PowerPoint files never leave your device. Processed locally using JSZip v3.10.1 + browser-image-compression v2.0.2. No upload to servers, no storage, no exposure. For confidential presentations (client pitch decks, financial reports, internal strategy, webinar recordings with proprietary content), browser-based processing is the only secure option. GDPR compliant by design—no data collection possible. Works offline after libraries load.
Reduce size 30-70% with 12-step automated optimization. Remove unused slide layouts (10-20MB savings), compress images, minify XML. Choose High Quality (print), Balanced (recommended), Smaller File (email-ready), or Maximum (smallest). Animations and transitions always preserved. Files stay private in your browser, never uploaded.
