The PowerPoint Shakedown

You need to merge two PowerPoint presentations before a meeting. You search "merge PowerPoint files online." The top results all say "free." You upload your files. You wait. A progress bar fills. The merge is done.

Then the download button asks for your email. Then a credit card for a "free trial." Then $14/month appears on your statement. Every month. $168/year to combine two ZIP files.

A PPTX file is literally a ZIP archive of XML files. Your browser can manipulate it directly.

What PPTX tools actually charge

The online presentation tool market mirrors the PDF tool playbook almost exactly. The same SEO-first strategy, the same "free" landing pages, the same paywall at the download button.

iLovePPT / Smallpdf: Presentation tools bundled into the same subscription that limits you to two operations per day on the free tier. Need to merge two decks and compress the result? That's your daily limit. Pro costs $108/year.

Aspose Slides: Offers free online PPTX merge, split, and convert tools with file size limits and watermarks on the free tier. The full SDK starts at $1,199/developer/year.

Zamzar, CloudConvert, Convertio: "Free" conversion tools that cap file sizes at 25-100MB. Most real-world presentations with embedded images and media easily exceed these limits. Premium tiers run $9-25/month.

The pattern is identical across every tool: upload your file to their server, wait for processing, hit a paywall or restriction at the point of highest commitment.

The unnecessary upload

Every one of these services requires you to upload your presentation to their server. This is the part that should bother you.

Presentations contain confidential business data. Sales forecasts, strategy decks, financial reports, employee information, client proposals, board materials. When you upload a presentation to a "free" online tool, that file sits on someone else's server. Their privacy policy may or may not protect it. Their security practices may or may not be adequate.

The upload isn't just a privacy risk. It's unnecessary. Every common PPTX operation can run entirely in your browser without your file ever leaving your device.

What PowerPoint tools actually do

A PPTX file is a ZIP archive containing XML files. That's not a simplification. It's literally the file format specification (ECMA-376). Inside every .pptx file is a folder structure with XML describing slides, a media folder with embedded images, and relationship files tying it all together.

Merge: Open two ZIP archives, copy slide XML files from one to the other, update the slide list. JSZip does this in the browser in milliseconds.

Split: Open the ZIP, keep only the slides you want, remove the rest. Same library, same speed.

Compress: Re-compress embedded images via the Canvas API, re-ZIP with maximum compression. Typically 30-70% file size reduction.

Extract images: Read the files from the ppt/media/ folder inside the ZIP. That's it. They're regular PNG and JPEG files.

Extract text: Parse the XML in each slide file and read the <a:t> elements. Standard DOM parsing.

Remove animations: Delete the <p:timing> elements from each slide's XML. Content is untouched.

None of this requires a server. None of this requires an upload. None of this requires a subscription. The browser's built-in DOMParser and the open-source JSZip library handle everything.

Who gets hurt

Office workers preparing for meetings. You need to combine slides from three team members into one deck. The meeting is in an hour. You search for a merge tool, hit a paywall, and either pay or scramble to copy-paste slides manually.

Teachers and professors. Combining lecture materials, stripping speaker notes before sharing with students, compressing image-heavy decks to fit email attachment limits. Every semester, for every course.

Students. Group projects where each member makes different slides. Merging them shouldn't require a subscription.

Small businesses. Sales decks, investor presentations, training materials. The people who can least afford $168/year for a file operation are the ones most likely to hit these paywalls.

The free alternative

I built nah.tools/pptx because merging two slide decks should not cost $168/year.

Ten PowerPoint tools: merge, split, compress, extract images, extract text, remove speaker notes, add watermark, remove animations, add slide numbers, edit metadata. Every operation runs in your browser. Your files never leave your device. No upload, no server processing, no file size limit.

No daily limit. No trial. No account. No credit card. The source code is public and MIT-licensed.

How to protect yourself

1. Never upload confidential presentations to online tools. If a tool requires uploading your file to a server, your data is on someone else's infrastructure. Use client-side tools instead.
2. Use built-in tools first. PowerPoint itself can merge presentations via "Reuse Slides." LibreOffice Impress is free and handles all PPTX operations. Google Slides imports and exports PPTX.
3. Never enter a credit card for basic file operations. Merging, splitting, and compressing presentations are ZIP file manipulations. If a tool charges for them, you're overpaying.
4. If you've been charged, dispute it with your bank. Document the misleading interface and file a chargeback.

A PPTX merge is combining two ZIP files. Nobody should pay $168/year to combine ZIP files. Especially not by uploading confidential business data to a stranger's server.