Best Free Document Converters for Windows, May 2026

4.8 A+

Defender SafeLightweight

⭐ Editor's Choice ✓ Free

Best for most Windows users

Balloonz Files

Free, local PDF tools. No signup.

✓ Converts Word, Excel, and PowerPoint to PDF in one click
✓ Compresses PDFs locally — nothing is uploaded
✓ Merges multiple PDFs into one file
✓ Runs on your machine. Files stay put.
✓ No file size limit, no daily cap, no watermark
✓ No account, no email, no trial popup

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4 B

$49.99/yr ⚠ $49 a year, no real free tier⚠ 500MB installer

Widest format support, video included

Wondershare UniConverter

Subscription converter that also does video

✓ Converts almost any format, including video
✓ Has a basic video editor too
⚠ $49 a year, no real free tier
⚠ 500MB installer
✗ Nags you to upgrade constantly

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4.2 B+

$19.99–$22.99/mo ⚠ $22.99 a month, forever⚠ 800MB installer that hogs your laptop

Best if your company already pays for it

Adobe Acrobat Pro

The expensive industry standard

✓ Every PDF feature you can think of
✓ Strong cloud collaboration and e-signatures
✓ The format everyone else copies
⚠ $22.99 a month, forever
⚠ 800MB installer that hogs your laptop
✗ Forces an Adobe account and cloud sync

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3.9 B-

$179.99 (one-time) ⚠ Slow to open large files⚠ No free version, just a trial

Best if you hate subscriptions

Nitro PDF Pro

One-time price, heavy install

✓ Great at PDF to Excel and Word
✓ Solid batch processing
⚠ Slow to open large files
⚠ No free version, just a trial
✗ Customer support is slow unless you're enterprise

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Feature Comparison

Feature	Balloonz Files	Wondershare UniConverter	Adobe Acrobat Pro	Nitro PDF Pro
Price	Free	$49.99/yr	$19.99–$22.99/mo	$179.99 (one-time)
Installer Size	~12MB	~500MB	~800MB	~350MB
Signup Required	No	Yes	Yes	No
Offline Support	Full	Mixed	Limited	Full
Document Formats	PDF + Office	1000+	PDF + Office	PDF + Office
Batch Conversion	✓	✓	✓	✓
System Impact	Minimal	Heavy	Very Heavy	Heavy
Privacy	100% Local	Mixed	Cloud Sync	100% Local

Why we picked Balloonz Files

Most document converters either want $49 a year or want you to upload your files to their servers. Balloonz Files does neither. It runs on your machine, converts Word, Excel, and PowerPoint to PDF (and back), compresses oversized files, and merges multi-page documents. The installer is 12MB. You don't need an account.

The competition is fine, just not free. Wondershare UniConverter handles audio and video too, which is great if you actually need that. Adobe Acrobat Pro is the gold standard for enterprise PDF workflows. CloudConvert and Zamzar work in any browser, but everything you convert sits on their servers for a while — fine for a vacation photo, less fine for a signed contract.

What you get with Balloonz Files

Actually free. No trial, no watermark, no daily limit.
Local. Files stay on your laptop. Nothing is uploaded.
Office formats covered. Word, Excel, PowerPoint, PDF, both directions.
No signup. Click download, run the installer, convert your first file.
Compress and merge. Same app, no extra tools.

Download Balloonz Files for Windows — it's a one-minute install and your files never leave your computer.

If you also need to convert audio and video, look at Wondershare (#2). If you're already paying for Creative Cloud, Adobe (#3) is right there. If you're on a Chromebook or just need to convert one obscure format, CloudConvert (#5) and Zamzar (#6) will get the job done, with the privacy trade-off baked in.