Bulk Convert WebP, AVIF, HEIC - Optimize Images for PageSpeed
Convert entire image directories to WebP or AVIF in one batch. Cut page weight by 60-80%. No cloud uploads, no per-image limits.
Download the trial: 10 free images
Windows 10 and 11. After 10 images the trial adds a watermark. No credit card.
- Add your imagesDrop entire /images folders - PNG, JPEG, BMP, TIFF, HEIC, any format.
- Set format and qualityChoose WebP, AVIF, or JPEG. Set quality target for optimal size/quality balance.
- ConvertAll images converted and compressed. Upload to your server. PageSpeed improved.
Used by web developers and agencies to hit 90+ PageSpeed scores.
Conversion Savings
| Conversion | Typical Savings | Note |
|---|---|---|
| PNG → WebP | 60–80% | Best for screenshots, diagrams, graphics with transparency |
| JPEG → WebP | 25–35% | Good for photos - smaller files with equal visual quality |
| PNG → AVIF | 70–90% | Maximum compression - excellent for modern browsers |
| HEIC → JPEG | — | Convert iPhone photos to universal web format |
| HEIC → WebP | 10–20% | Modern format to modern format - best of both worlds |
| BMP/TIFF → WebP | 90%+ | Legacy formats shrink dramatically - update old sites fast |
Before & After
Before Contenta
Upload images one-by-one to TinyPNG. Wait. Download. Re-upload to server. Hit the 500-image monthly limit. Try another tool. Repeat.
After Contenta
Drop the entire /images folder into Contenta. Choose WebP at quality 80. Click Convert. Upload the output folder. PageSpeed score jumps 30 points.
Start Converting Photos Today
Choose the plan that works for you. All plans include every feature.
No subscription trap. Contenta is a one-time purchase — less than 2 months of Lightroom, and it's yours forever.
Frequently Asked Questions
Contenta reads and writes 60+ formats including JPEG, PNG, TIFF, WebP, HEIC, AVIF, BMP, GIF, PDF, and 25+ camera RAW formats (CR2, NEF, ARW, DNG, RAF, and more).
There is no limit. Contenta uses multi-core processing to convert thousands of images in minutes. Users regularly process 10,000+ photos in a single batch.
Yes. Contenta supports 25+ RAW formats from Canon, Nikon, Sony, Fuji, Panasonic, Olympus, and more. Full white balance, denoising, and color adjustment controls are built in.
The 30-day trial includes every feature. The first 10 images you convert are saved without a watermark. That allowance is counted once across the whole trial, not per batch, so conversions after it carry a small watermark. A license removes it.
No. Contenta Converter is a one-time purchase. You pay once and own it forever, including all future updates. No monthly or yearly fees.
What Our Users Say
“I have been using Contenta Converter for years and it has saved me countless hours of work. Highly recommended!”
“Simple, fast, and does exactly what it promises. The batch processing is incredibly efficient.”
“Best image converter I have found. The RAW support and metadata handling are top-notch.”
Published by ContentaSoft, Umea, Sweden, developer of Contenta Converter PREMIUM.
Contenta Converter PREMIUM is a desktop application for Windows that batch converts, resizes, renames, watermarks, and processes images in 60+ formats including JPEG, PNG, WebP, HEIC, TIFF, RAW, and PDF.
This software contains no adware, spyware, toolbars, or bundled third-party programs. The installer installs only Contenta Converter PREMIUM.
Conversion, resizing, watermarking and metadata editing run on your computer. The optional AI features (background removal, photo restoration, colorize) send the images you process with them to Google Gemini using your own API key. The software does not collect personal data.
Free 30-day trial with full functionality. After the trial, a license key is required. Lifetime license: $129 (one-time payment, no subscription).
How to Uninstall
Open Windows Settings > Apps > Installed apps, find "Contenta Converter PREMIUM" in the list, and click Uninstall. You can also run the uninstaller from the installation folder or use Control Panel > Programs and Features.
Download size: ~2 MB (web installer). Additional components are downloaded during installation (~300 MB total).