A WebP Converter You Can Actually Trust
No bloat. No catch. Just a small Python tool that batch-converts your images locally because the internet didn’t need another clunky download gate wrapped in 17 popups.
Free WebP converter — 100% free, no trial, no credit card, no signup required.
Download the Project X Image Optimizer to bulk convert PNGs and JPGs into lightweight WebP files, boost Core Web Vitals, and keep every client project moving fast.
Worried About Website Speed? You Should Be.
If you’re here downloading a converter, odds are you actually care about how fast your site loads. That’s smart. Images matter, but they’re just one piece of the performance puzzle.
If you're serious about staying ahead (or just sick of watching your site crawl), check out Project X. It’s what we built to fix everything bloated templates and lazy devs leave behind. Because a fast site isn’t just compressed; it’s engineered.
Not the right time? Cool. Download the tool, DIY your way through it, and come back when you’re ready to go full throttle.
Either way, glad you’re here. Enjoy the tool.
Schedule a Project X Discovery Call🛠 Requires Python 3.8+ and Pillow. Works on Mac, Windows, and Linux.
100% free WebP converter. No trial, no credit card, no signup. Fully local. No cloud. No tracking. No creepy scripts hiding in the background.
Project X Image Optimizer — Bulk WebP Convertor 1.2
Version 1.2 keeps the converter fast and simple while giving you more control over image quality and size right inside the app.
Version Changelog
All notable changes to this project will be tracked right here.
[Unreleased]
Added
- Ultra-compressed WebP preset with an optional reduced-quality mode right in the compression selector.
- Optional resize controls (original size, 25% smaller, 50% smaller) applied before saving WebP files.
- Informational logging that reports the selected image scale for every conversion run.
[1.1] — Stable release
Added
- Core batch conversion engine for PNG and JPG folders with streamlined folder selection.
- Dual compression profiles (Lossless and Website) with live progress indicators.
- Summary reporting that highlights original vs. optimized file sizes after each run.
- PowerShell helpers for one-click dependency installs and app launch on Windows.
Why This Free WebP Converter Ranks
- Truly free download: Grab it with zero signup, zero upsells, zero credit card prompts.
- Local and secure: Convert images on your own machine so client files never leave your drive.
- Optimized for Google PageSpeed: Smaller WebP files help you hit Core Web Vitals and improve rankings.
- Built for SEO pros: Batch-convert entire folders before you upload to WordPress, Shopify, Webflow, or custom stacks.
Project X Image Optimizer is the free WebP converter trusted by technical SEOs and agencies who need fast, reliable, bloat-free tooling. Download it, keep it forever, and streamline every client launch.
Everything You Need for Bulk WebP Conversion
Batch Convert Entire Photo Libraries
Point the converter at any folder and it will move through every PNG and JPG you own. Agencies use it before uploading assets to new websites, launches, or migrations.
Choose Lossless or High-Impact Compression
Lossless mode preserves every pixel for design teams. Website mode balances clarity and speed so developers can push WebP files live without sacrificing quality.
Track File Reductions in Real Time
Live reporting shows original and converted sizes, total savings, and overall reduction percentages. Perfect for client reports and technical SEO audits.
Who Uses This Free WebP Converter?
- SEO strategists shrink hero images, background videos, and product photography before shipping new landing pages.
- Performance-focused developers plug the converted WebP files into WordPress, Shopify, Webflow, Craft, or custom React builds.
- Agencies and freelancers deliver faster builds by eliminating hours of manual compression or glitchy online converters.
- In-house marketing teams use it to reduce storage costs and keep DAM libraries standardized without uploading sensitive assets to third-party websites.
If you manage client performance, you already know speed wins deals. Start with WebP, finish with the Project X framework to rebuild every slow page template holding you back.
How to Run It:
Everything you need ships inside the download. Follow the steps below and you’ll be converting images in minutes.
Step 1: Install everything automatically
- Extract the ZIP and open the folder (for example
C:\Users\Trevor-Main\Desktop\webp convertor). - Right-click install_dependencies.ps1 and choose Run with PowerShell.
- Approve any Windows prompts (choose Open, Yes, or Run).
- If PowerShell asks about execution policy, type Y then press Enter.
- Wait until you see All dependencies are ready! and the window closes.
- The script installs Python 3.8+, Pillow, and updates the needed tooling for you.
- Running it again later is safe, so use it to keep dependencies current.
- Grab a quick photo of the full error message.
- Restart the computer and run install_dependencies.ps1 one more time.
- If it still fails, follow the manual backup plan below.
Step 2: Start the converter app
- Stay in the same folder.
- Double-click start_app.bat.
- A PowerShell window appears (leave it open) and the “PROJECT X Image Optimizer” window launches. That’s the app.
Step 3: Convert your pictures
- Click Browse… beside “Input folder” and choose the images you want to convert.
- Select a compression option (Lossless keeps every detail; Website prioritizes speed).
- Click Convert to WebP, name your output folder, and pick where it should live.
- Watch the live progress bars and review the “File reductions” summary when it’s done.
Step 4: Come back any time
- Launch the tool again by double-clicking start_app.bat.
- Run install_dependencies.ps1 occasionally to keep Python and Pillow up to date.
Manual backup plan (only if needed)
- Download Python for your OS from python.org.
- Run the installer and check Add python.exe to PATH.
- Open PowerShell and run:
python -m pip install --upgrade pip
python -m pip install pillow- Return to the converter folder and launch start_app.bat.
That’s it. No cloud. No tracking. Just a small, local WebP converter that respects your workflow.
Free WebP Converter Frequently Asked Questions
Is the Project X Image Optimizer really 100% free?
Yes. Download it, unzip it, and run it without entering an email address, creating an account, or providing a credit card. No limits, no timers, and no watermarks.
Does the converter work on Windows, macOS, and Linux?
It does. The tool runs on any operating system with Python 3.8 or newer installed. The bundled scripts automate setup so you can begin converting instantly.
Can I convert transparent PNGs to WebP without losing the alpha channel?
Absolutely. Lossless mode keeps transparency intact. Designers use it for logos, icon sets, and UI assets where clarity matters.
How big of a speed boost will WebP give my site?
On average, teams see 25 to 60 percent smaller file sizes versus original PNG or JPG assets. That translates into faster First Contentful Paint, better Core Web Vitals, and stronger SEO performance.
Where should I go if I need full-site performance engineering?
Schedule a Project X discovery call. The same team that built this converter will audit your stack, rebuild critical templates, and engineer a faster foundation for long-term growth.